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JS\u3092\u4e2d\u5fc3\u3068\u3057\u305f\u591a\u304f\u306e\u5730\u56f3\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002MVT\u306f\u30b8\u30aa\u30e1\u30c8\u30ea\u3092\u52b9\u7387\u7684\u306b\u5727\u7e2e\u3067\u304d\u308b\u305f\u3081\u3001\u7279\u306b\u5927\u304d\u306a\u30c7\u30fc\u30bf\u3067GeoJSON\u3092\u76f4\u63a5\u8868\u793a\u3059\u308b\u3088\u308a\u9ad8\u901f\u3067\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3067\u3001MVT\u3092\u7528\u3044\u308b\u306b\u306f\u4e8b\u524d\u5909\u63db\u3068\u914d\u4fe1\u74b0\u5883\u306e\u6574\u5099\u304c\u5fc5\u8981\u3067\u3001\u5b9f\u88c5\u30fb\u904b\u7528\u30b3\u30b9\u30c8\u304c\u9ad8\u304f\u306a\u308b\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u63cf\u753b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u91cd\u8996\u3057\u3066MVT\u3092\u9078\u629e\u3059\u308b\u3068\u3001<strong>\u30c7\u30fc\u30bf\u306e\u53ef\u5909\u6027\uff08\u66f4\u65b0\u306e\u5bb9\u6613\u3055\uff09\u3084\u5373\u6642\u6027\u304c\u72a0\u7272\u306b\u306a\u308b<\/strong>\u3068\u3044\u3046\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u306b\u76f4\u9762\u3057\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306ePoC\u3067\u306f\u3001\u3053\u306e\u30ae\u30e3\u30c3\u30d7\u3092\u57cb\u3081\u308b\u624b\u6bb5\u3068\u3057\u3066\u3001<strong>DuckDB\u3092\u7528\u3044\u305f\u30aa\u30f3\u30c7\u30de\u30f3\u30c9\u306a\u30d9\u30af\u30bf\u30fc\u30bf\u30a4\u30eb\u751f\u6210<\/strong>\u306b\u53d6\u308a\u7d44\u307f\u307e\u3057\u305f\u3002<\/p>\n<h2>DuckDB\u3068\u306f\uff1f<\/h2>\n<p><strong>DuckDB<\/strong>\u306f\u3001\u300cSQLite for Analytics\u300d\u3068\u3082\u547c\u3070\u308c\u308b\u3001\u8efd\u91cf\u304b\u3064\u9ad8\u901f\u306a\u5217\u6307\u5411\u578b\u306e\u5206\u6790\u5411\u3051\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a8\u30f3\u30b8\u30f3\u3067\u3059\u3002C++\u3067\u5b9f\u88c5\u3055\u308c\u3066\u304a\u308a\u3001\u30b7\u30f3\u30b0\u30eb\u30d0\u30a4\u30ca\u30ea\u3067\u52d5\u4f5c\u3059\u308b\u8a2d\u8a08\u306a\u304c\u3089\u3001\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u3082\u975e\u5e38\u306b\u9ad8\u901f\u306a\u30af\u30a8\u30ea\u51e6\u7406\u6027\u80fd\u3092\u767a\u63ee\u3057\u307e\u3059\u3002\u5206\u6790\u7528\u9014\u3067\u4e3b\u306b\u5229\u7528\u3055\u308c\u308bPostgreSQL\u3084Snowflake\u3001BigQuery\u306a\u3069\u3068\u6bd4\u8f03\u3057\u3066\u3082\u3001<strong>\u4f9d\u5b58\u306a\u304f\u30ed\u30fc\u30ab\u30eb\u74b0\u5883\u3067\u52d5\u4f5c\u3057\u3001\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u4e0d\u8981\u304b\u3064\u4f4e\u30ea\u30bd\u30fc\u30b9\u3067\u6271\u3048\u308b<\/strong>\u70b9\u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n<p>\u8fd1\u5e74\u3001DuckDB\u304c\u6ce8\u76ee\u3092\u96c6\u3081\u308b\u7406\u7531\u306e\u3072\u3068\u3064\u306b\u3001<strong>\u591a\u69d8\u306a\u30d5\u30a1\u30a4\u30eb\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3084\u5916\u90e8\u30c7\u30fc\u30bf\u30bd\u30fc\u30b9\u3092\u900f\u904e\u7684\u306b\u6271\u3048\u308b<\/strong>\u70b9\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001CSV\u3084Parquet\u3001JSON\u3068\u3044\u3063\u305f\u5f62\u5f0f\u306b\u5bfe\u3057\u3066\u3001SQL\u30af\u30a8\u30ea\u3067\u76f4\u63a5\u8aad\u307f\u8fbc\u307f\u30fb\u96c6\u8a08\u30fbJOIN\u304c\u53ef\u80fd\u3067\u3059\u3002PostGIS\u5f62\u5f0f\u3084GeoJSON\u3001SQLite\u3001\u30af\u30e9\u30a6\u30c9\u30b9\u30c8\u30ec\u30fc\u30b8\u4e0a\u306e\u30c7\u30fc\u30bf\u306b\u3082\u5bfe\u5fdc\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u3053\u3046\u3057\u305f\u67d4\u8edf\u6027\u306f\u3001\u300c\u5206\u6790\u306e\u305f\u3081\u306bETL\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u3092\u308f\u3056\u308f\u3056\u69cb\u7bc9\u3057\u306a\u304f\u3066\u3088\u3044\u300d\u3068\u3044\u3046\u70b9\u3067\u9b45\u529b\u7684\u3067\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001<strong>DuckDB-WASM<\/strong>\uff08WebAssembly\u7248\uff09\u306e\u767b\u5834\u306b\u3088\u308a\u3001DuckDB\u3092<strong>\u30d6\u30e9\u30a6\u30b6\u4e0a\u3067\u305d\u306e\u307e\u307e\u5b9f\u884c<\/strong>\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u3001Web\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u4e2d\u3067DuckDB\u3092\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u7684\u306b\u5229\u7528\u3057\u3001\u30d6\u30e9\u30a6\u30b6\u3067\u76f4\u63a5\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u307f\u30fb\u5909\u63db\u30fb\u53ef\u8996\u5316\u3059\u308b\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u304c\u6025\u901f\u306b\u5e83\u304c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306ePoC\u3067\u3082\u3001\u3053\u306eDuckDB\u306e\u300c\u3069\u3053\u3067\u3082\u52d5\u304f\u8efd\u91cf\u6027\u300d\u3068\u300c\u3042\u3089\u3086\u308b\u5f62\u5f0f\u3092\u6271\u3048\u308b\u67d4\u8edf\u6027\u300d\u3092\u6d3b\u304b\u3057\u3001\u30d6\u30e9\u30a6\u30b6\u4e0a\u3067DuckDB-WASM\u3092\u4f7f\u7528\u3057\u3001\u5730\u7406\u7a7a\u9593\u30c7\u30fc\u30bf\u3092DuckDB\u306b\u683c\u7d0d\u3057\u3001\u305d\u306e\u5f8cMVT\u3078\u306e\u5909\u63db\u3092\u631f\u307e\u305a\u306b\u30d9\u30af\u30bf\u30fc\u30bf\u30a4\u30eb\u3068\u3057\u3066\u914d\u4fe1\u3059\u308b\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u691c\u8a3c\u3057\u307e\u3057\u305f\u3002<\/p>\n<h2>DuckDB\u306b\u5730\u7406\u7a7a\u9593\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b<\/h2>\n<p>\u30d6\u30e9\u30a6\u30b6\u4e0a\u3067DuckDB-WASM\u3092\u30a4\u30f3\u30e1\u30e2\u30ea\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092\u8003\u3048\u307e\u3059\u3002\u307e\u305aDuckDB\u3092\u521d\u671f\u5316\u3057\u3001\u5730\u7406\u7a7a\u9593\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306aSQL\u3067\u69d8\u3005\u306a\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u8fbc\u307f\u304c\u53ef\u80fd\u3067\u3059\u3002\u8aad\u307f\u8fbc\u307f\u5f8c\u306b\u7a7a\u9593\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff08R-Tree\uff09\u3092\u4f5c\u6210\u3057\u3066\u304a\u304f\u3068\u3001\u5f8c\u8ff0\u306e\u30bf\u30a4\u30eb\u53d6\u5f97\u51e6\u7406\u304c\u9ad8\u901f\u5316\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"shiki github-light\" style=\"background-color:#fff;color:#24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49\">CREATE<\/span><span style=\"color:#D73A49\"> TABLE<\/span><span style=\"color:#6F42C1\"> example<\/span><span style=\"color:#D73A49\"> AS<\/span><span style=\"color:#D73A49\"> SELECT<\/span><span style=\"color:#D73A49\"> *<\/span><span style=\"color:#D73A49\"> FROM<\/span><span style=\"color:#24292E\"> st_read(<\/span><span style=\"color:#032F62\">\"<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">https:\/\/example.com\/hoge.geojson<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">\"<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">CREATE<\/span><span style=\"color:#D73A49\"> INDEX<\/span><span style=\"color:#6F42C1\"> example_idx<\/span><span style=\"color:#D73A49\"> ON<\/span><span style=\"color:#24292E\"> example <\/span><span style=\"color:#D73A49\">USING<\/span><span style=\"color:#24292E\"> RTREE (geom);<\/span><\/span>\n<span class=\"line\"\/><\/code><\/pre>\n<p>DuckDB\u3092\u521d\u671f\u5316\u3057\u3001HTTP\u3067GeoJSON\u3092\u8aad\u307f\u8fbc\u3080TypeScript\u30b3\u30fc\u30c9\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"shiki github-light\" style=\"background-color:#fff;color:#24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49\">import<\/span><span style=\"color:#005CC5\"> *<\/span><span style=\"color:#D73A49\"> as<\/span><span style=\"color:#24292E\"> duckdb <\/span><span style=\"color:#D73A49\">from<\/span><span style=\"color:#032F62\"> \"@duckdb\/duckdb-wasm\"<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">import<\/span><span style=\"color:#24292E\"> eh_worker <\/span><span style=\"color:#D73A49\">from<\/span><span style=\"color:#032F62\"> \"@duckdb\/duckdb-wasm\/dist\/duckdb-browser-eh.worker.js?url\"<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">import<\/span><span style=\"color:#24292E\"> mvp_worker <\/span><span style=\"color:#D73A49\">from<\/span><span style=\"color:#032F62\"> \"@duckdb\/duckdb-wasm\/dist\/duckdb-browser-mvp.worker.js?url\"<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">import<\/span><span style=\"color:#24292E\"> duckdb_wasm_eh <\/span><span style=\"color:#D73A49\">from<\/span><span style=\"color:#032F62\"> \"@duckdb\/duckdb-wasm\/dist\/duckdb-eh.wasm?url\"<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">import<\/span><span style=\"color:#24292E\"> duckdb_wasm <\/span><span style=\"color:#D73A49\">from<\/span><span style=\"color:#032F62\"> \"@duckdb\/duckdb-wasm\/dist\/duckdb-mvp.wasm?url\"<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">const<\/span><span style=\"color:#005CC5\"> MANUAL_BUNDLES<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#6F42C1\"> duckdb<\/span><span style=\"color:#24292E\">.<\/span><span style=\"color:#6F42C1\">DuckDBBundles<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">  mvp: { mainModule: duckdb_wasm, mainWorker: mvp_worker },<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">  eh: { mainModule: duckdb_wasm_eh, mainWorker: eh_worker },<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">};<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">const<\/span><span style=\"color:#005CC5\"> bundle<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#D73A49\"> await<\/span><span style=\"color:#24292E\"> duckdb.<\/span><span style=\"color:#6F42C1\">selectBundle<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#005CC5\">MANUAL_BUNDLES<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">const<\/span><span style=\"color:#005CC5\"> worker<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#D73A49\"> new<\/span><span style=\"color:#6F42C1\"> Worker<\/span><span style=\"color:#24292E\">(bundle.mainWorker<\/span><span style=\"color:#D73A49\">!<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">const<\/span><span style=\"color:#005CC5\"> logger<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#D73A49\"> new<\/span><span style=\"color:#24292E\"> duckdb.<\/span><span style=\"color:#6F42C1\">ConsoleLogger<\/span><span style=\"color:#24292E\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">const<\/span><span style=\"color:#005CC5\"> db<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#D73A49\"> new<\/span><span style=\"color:#24292E\"> duckdb.<\/span><span style=\"color:#6F42C1\">AsyncDuckDB<\/span><span style=\"color:#24292E\">(logger, worker);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">await<\/span><span style=\"color:#24292E\"> db.<\/span><span style=\"color:#6F42C1\">instantiate<\/span><span style=\"color:#24292E\">(bundle.mainModule, bundle.pthreadWorker);<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">const<\/span><span style=\"color:#005CC5\"> conn<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#D73A49\"> await<\/span><span style=\"color:#24292E\"> db.<\/span><span style=\"color:#6F42C1\">connect<\/span><span style=\"color:#24292E\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">await<\/span><span style=\"color:#24292E\"> conn.<\/span><span style=\"color:#6F42C1\">execute<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">\"LOAD spatial;\"<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">await<\/span><span style=\"color:#24292E\"> conn.<\/span><span style=\"color:#6F42C1\">execute<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">`CREATE TABLE example AS SELECT * FROM st_read(\"<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">https:\/\/example.com\/hoge.geojson);\");`<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">await<\/span><span style=\"color:#24292E\"> conn.<\/span><span style=\"color:#6F42C1\">execute<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">`CREATE INDEX example_idx ON example USING RTREE (geom);`<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"\/><\/code><\/pre>\n<p>\u8aad\u307f\u8fbc\u3080\u30d5\u30a1\u30a4\u30eb\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u3064\u3044\u3066\u88dc\u8db3\u3057\u307e\u3059\u3002DuckDB\u306fGeoJSON\u3092\u306f\u3058\u3081\u591a\u304f\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u5bfe\u5fdc\u3057\u307e\u3059\u304c\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u3088\u3063\u3066\u306f\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u304c\u5927\u304d\u3044\u3068\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c\u4f38\u3073\u307e\u3059\u3002\u305f\u3068\u3048\u307010\u4e07\u4ef6\u4ee5\u4e0a\u306eFeature\u3092\u6301\u3064\u7d04800MB\u306eGeoJSON\u3092DuckDB-WASM\u3067\u8aad\u307f\u8fbc\u3080\u3068\u3001\u74b0\u5883\u306b\u3088\u3063\u3066\u306f30\u79d2\u4ee5\u4e0a\u304b\u304b\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u521d\u56de\u8aad\u307f\u8fbc\u307f\u3092\u9ad8\u901f\u5316\u3059\u308b\u306b\u306f\u3001\u30b8\u30aa\u30e1\u30c8\u30ea\u306e\u6700\u9069\u5316\u306b\u52a0\u3048\u3001\u4e8b\u524d\u306bGeoJSON\u3092Parquet\u306b\u5909\u63db\u3057\u3066\u4f7f\u7528\u3059\u308b\u306e\u304c\u52b9\u679c\u7684\u3067\u3059\u3002DuckDB\u3067\u3082\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5909\u63db\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"shiki github-light\" style=\"background-color:#fff;color:#24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49\">CREATE<\/span><span style=\"color:#D73A49\"> TABLE<\/span><span style=\"color:#6F42C1\"> example<\/span><span style=\"color:#D73A49\"> AS<\/span><span style=\"color:#D73A49\"> SELECT<\/span><span style=\"color:#D73A49\"> *<\/span><span style=\"color:#D73A49\"> FROM<\/span><span style=\"color:#24292E\"> st_read(<\/span><span style=\"color:#032F62\">\"<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">https:\/\/example.com\/hoge.geojson<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">);\"<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">COPY<\/span><span style=\"color:#24292E\"> example <\/span><span style=\"color:#D73A49\">TO<\/span><span style=\"color:#032F62\"> \"hoge.parquet\"<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"\/><\/code><\/pre>\n<h2>DuckDB\u304b\u3089GeoJSON\u3068\u3057\u3066\u30bf\u30a4\u30eb\u3092\u53d6\u5f97\u3059\u308b<\/h2>\n<p>\u6b21\u306b\u3001DuckDB\u306e\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u4efb\u610f\u306e\u30bf\u30a4\u30eb\uff08Z\/X\/Y\uff09\u306e\u7bc4\u56f2\u306b\u3042\u308b\u30ec\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002Z\u3001X\u3001Y\u3092\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u53d6\u308a\u3001\u30bf\u30a4\u30eb\u9818\u57df\u3067\u30af\u30ea\u30c3\u30d7\u3057\u305f\u30b8\u30aa\u30e1\u30c8\u30ea\u3092GeoJSON\u3067\u8fd4\u3059SQL\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"shiki github-light\" style=\"background-color:#fff;color:#24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49\">SELECT<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">  ST_AsGeoJSON(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    ST_Intersection(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      ST_Transform(geom, <\/span><span style=\"color:#032F62\">'EPSG:4326'<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#032F62\">'EPSG:3857'<\/span><span style=\"color:#24292E\">, true),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      ST_TileEnvelope(${z}, ${x}, ${y})<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    )<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">  ) <\/span><span style=\"color:#D73A49\">AS<\/span><span style=\"color:#24292E\"> geojson,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  name<\/span><span style=\"color:#24292E\">,       <\/span><span style=\"color:#6A737D\">-- example property<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  description<\/span><span style=\"color:#6A737D\"> -- example property<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">FROM<\/span><span style=\"color:#24292E\"> example<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">WHERE<\/span><span style=\"color:#24292E\"> ST_Intersects(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">  ST_Transform(geom, <\/span><span style=\"color:#032F62\">'EPSG:4326'<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#032F62\">'EPSG:3857'<\/span><span style=\"color:#24292E\">, true),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">  ST_TileEnvelope(${z}, ${x}, ${y})<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"\/><\/code><\/pre>\n<p>\u3053\u306e\u30af\u30a8\u30ea\u3067\u4f7f\u7528\u3057\u3066\u3044\u308b\u4e3b\u306a\u95a2\u6570\uff08spatial\u62e1\u5f35\uff09<\/p>\n<ul>\n<li><code>ST_TileEnvelope<\/code>\uff1aZ\/X\/Y\u304b\u3089\u5f53\u8a72\u30bf\u30a4\u30eb\u306e\u5916\u63a5\u77e9\u5f62\uff08Web Mercator\uff09\u3092\u751f\u6210<\/li>\n<li><code>ST_Transform<\/code>\uff1aWGS84\uff08EPSG:4326\uff09\u304b\u3089Web Mercator\uff08EPSG:3857\uff09\u306b\u5909\u63db\uff08always_xy=true\uff09<\/li>\n<li><code>ST_Intersects<\/code>\uff1a\u4ea4\u5dee\u5224\u5b9a<\/li>\n<li><code>ST_Intersection<\/code>\uff1a\u4ea4\u5dee\u90e8\u5206\u306e\u30b8\u30aa\u30e1\u30c8\u30ea\u3092\u53d6\u5f97\uff08\u30bf\u30a4\u30eb\u5916\u306e\u306f\u307f\u51fa\u3057\u3092\u9664\u53bb\uff09<\/li>\n<li><code>ST_AsGeoJSON<\/code>\uff1a\u30b8\u30aa\u30e1\u30c8\u30ea\u3092GeoJSON\u6587\u5b57\u5217\u3078\u5909\u63db<\/li>\n<\/ul>\n<p>TypeScript\u3067\u306e\u53d6\u5f97\u4f8b\uff08FeatureCollection\u3067\u8fd4\u5374\uff09<\/p>\n<pre class=\"shiki github-light\" style=\"background-color:#fff;color:#24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49\">async<\/span><span style=\"color:#D73A49\"> function<\/span><span style=\"color:#6F42C1\"> queryTile<\/span><span style=\"color:#24292E\">(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  conn<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> any<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  table<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> string<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  z<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  x<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  y<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  columns<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> string<\/span><span style=\"color:#24292E\">[] <\/span><span style=\"color:#D73A49\">=<\/span><span style=\"color:#24292E\"> []<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">) {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> props<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> columns.<\/span><span style=\"color:#005CC5\">length<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">    ?<\/span><span style=\"color:#24292E\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">columns.map<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">((<\/span><span style=\"color:#E36209\">c<\/span><span style=\"color:#24292E\">) <\/span><span style=\"color:#D73A49\">=&gt;<\/span><span style=\"color:#032F62\"> `\"${<\/span><span style=\"color:#24292E\">c<\/span><span style=\"color:#032F62\">.<\/span><span style=\"color:#6F42C1\">replace<\/span><span style=\"color:#032F62\">(<\/span><span style=\"color:#032F62\">\/<\/span><span style=\"color:#22863A;font-weight:bold\">\\\"<\/span><span style=\"color:#032F62\">\/<\/span><span style=\"color:#D73A49\">g<\/span><span style=\"color:#032F62\">, <\/span><span style=\"color:#032F62\">'\"\"'<\/span><span style=\"color:#032F62\">)<\/span><span style=\"color:#032F62\">}\"`<\/span><span style=\"color:#24292E\">).<\/span><span style=\"color:#6F42C1\">join<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">', '<\/span><span style=\"color:#24292E\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">    :<\/span><span style=\"color:#032F62\"> '*'<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> sql<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#032F62\"> `SELECT<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    ST_AsGeoJSON(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">      ST_Intersection(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">        ST_Transform(geom, 'EPSG:4326', 'EPSG:3857', true),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">        ST_TileEnvelope(${<\/span><span style=\"color:#24292E\">z<\/span><span style=\"color:#032F62\">}, ${<\/span><span style=\"color:#24292E\">x<\/span><span style=\"color:#032F62\">}, ${<\/span><span style=\"color:#24292E\">y<\/span><span style=\"color:#032F62\">})<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">      )<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    ) AS geojson,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    ${<\/span><span style=\"color:#24292E\">props<\/span><span style=\"color:#032F62\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">  FROM ${<\/span><span style=\"color:#24292E\">table<\/span><span style=\"color:#032F62\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">  WHERE ST_Intersects(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    ST_Transform(geom, 'EPSG:4326', 'EPSG:3857', true),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    ST_TileEnvelope(${<\/span><span style=\"color:#24292E\">z<\/span><span style=\"color:#032F62\">}, ${<\/span><span style=\"color:#24292E\">x<\/span><span style=\"color:#032F62\">}, ${<\/span><span style=\"color:#24292E\">y<\/span><span style=\"color:#032F62\">})<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">  );`<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> result<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#D73A49\"> await<\/span><span style=\"color:#24292E\"> conn.<\/span><span style=\"color:#6F42C1\">query<\/span><span style=\"color:#24292E\">(sql);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> rows<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> result.<\/span><span style=\"color:#6F42C1\">toArray<\/span><span style=\"color:#24292E\">();<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> features<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> rows<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    .<\/span><span style=\"color:#6F42C1\">map<\/span><span style=\"color:#24292E\">((<\/span><span style=\"color:#E36209\">row<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> any<\/span><span style=\"color:#24292E\">) <\/span><span style=\"color:#D73A49\">=&gt;<\/span><span style=\"color:#24292E\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      if<\/span><span style=\"color:#24292E\"> (<\/span><span style=\"color:#D73A49\">!<\/span><span style=\"color:#24292E\">row.geojson) <\/span><span style=\"color:#D73A49\">return<\/span><span style=\"color:#005CC5\"> null<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      let<\/span><span style=\"color:#24292E\"> geometry;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      try<\/span><span style=\"color:#24292E\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">        geometry <\/span><span style=\"color:#D73A49\">=<\/span><span style=\"color:#005CC5\"> JSON<\/span><span style=\"color:#24292E\">.<\/span><span style=\"color:#6F42C1\">parse<\/span><span style=\"color:#24292E\">(row.geojson <\/span><span style=\"color:#D73A49\">as<\/span><span style=\"color:#005CC5\"> string<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      } <\/span><span style=\"color:#D73A49\">catch<\/span><span style=\"color:#24292E\"> (e) {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">        console.<\/span><span style=\"color:#6F42C1\">error<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">'Error parsing GeoJSON:'<\/span><span style=\"color:#24292E\">, e);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">        return<\/span><span style=\"color:#005CC5\"> null<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      }<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      const<\/span><span style=\"color:#005CC5\"> properties<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> Object.<\/span><span style=\"color:#6F42C1\">fromEntries<\/span><span style=\"color:#24292E\">(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">        Object.<\/span><span style=\"color:#6F42C1\">entries<\/span><span style=\"color:#24292E\">(row).<\/span><span style=\"color:#6F42C1\">filter<\/span><span style=\"color:#24292E\">(([<\/span><span style=\"color:#E36209\">k<\/span><span style=\"color:#24292E\">]) <\/span><span style=\"color:#D73A49\">=&gt;<\/span><span style=\"color:#24292E\"> k <\/span><span style=\"color:#D73A49\">!==<\/span><span style=\"color:#032F62\"> 'geom'<\/span><span style=\"color:#D73A49\"> &amp;&amp;<\/span><span style=\"color:#24292E\"> k <\/span><span style=\"color:#D73A49\">!==<\/span><span style=\"color:#032F62\"> 'geojson'<\/span><span style=\"color:#24292E\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      );<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      return<\/span><span style=\"color:#24292E\"> { type: <\/span><span style=\"color:#032F62\">'Feature'<\/span><span style=\"color:#D73A49\"> as<\/span><span style=\"color:#D73A49\"> const<\/span><span style=\"color:#24292E\">, geometry, properties };<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    })<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    .<\/span><span style=\"color:#6F42C1\">filter<\/span><span style=\"color:#24292E\">(Boolean);<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">  return<\/span><span style=\"color:#24292E\"> { type: <\/span><span style=\"color:#032F62\">'FeatureCollection'<\/span><span style=\"color:#D73A49\"> as<\/span><span style=\"color:#D73A49\"> const<\/span><span style=\"color:#24292E\">, features };<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">}<\/span><\/span>\n<span class=\"line\"\/><\/code><\/pre>\n<p>\u3053\u306e\u65b9\u6cd5\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u304c\u3001MapLibre GL JS\u306e\u30ab\u30b9\u30bf\u30e0\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u306f\u30d9\u30af\u30bf\u30fc\u30bf\u30a4\u30eb\u3068\u3057\u3066MVT\u306e\u307f\u3092\u6271\u3046\u305f\u3081\u3001GeoJSON\u3092\u305d\u306e\u307e\u307e\u8868\u793a\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u305f\u304c\u3063\u3066\u3001GeoJSON\u2192MVT\u306e\u5909\u63db\u5de5\u7a0b\u304c\u5fc5\u8981\u3068\u306a\u308a\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4e0a\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u5897\u52a0\u306b\u3064\u306a\u304c\u308a\u5f97\u307e\u3059\u3002<\/p>\n<h2>DuckDB\u304b\u3089MVT\u3068\u3057\u3066\u30bf\u30a4\u30eb\u3092\u53d6\u5f97\u3059\u308b<\/h2>\n<p>\u5b9f\u306f\u3001DuckDB-WASM v1.30.1\u4ee5\u964d\u3001<code>ST_AsMVT<\/code> \u3068 <code>ST_AsMVTGeom<\/code> \u304c\u5229\u7528\u53ef\u80fd\u306b\u306a\u308a\u307e\u3057\u305f\uff01<\/p>\n<p>\u3053\u308c\u3089\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001DuckDB\u304b\u3089<strong>\u76f4\u63a5<\/strong>MVT\uff08PBF\uff09\u3092\u751f\u6210\u3067\u304d\u307e\u3059\u3002spatial\u62e1\u5f35\u3092\u6709\u52b9\u5316\u3057\u3066\u3044\u308c\u3070\u3001PostGIS\u4e92\u63db\u306e\u95a2\u6570\u7fa4\uff08<code>ST_AsMVT<\/code>\u3001<code>ST_AsMVTGeom<\/code>\u3001<code>ST_TileEnvelope<\/code> \u306a\u3069\uff09\u306b\u3088\u308a\u3001\u30bf\u30a4\u30eb\u5883\u754c\u3067\u306e\u30af\u30ea\u30c3\u30d4\u30f3\u30b0\u304b\u3089PBF\u3078\u306e\u30a8\u30f3\u30b3\u30fc\u30c9\u307e\u3067\u3092SQL\u3067\u5b8c\u7d50\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306fSQL\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"shiki github-light\" style=\"background-color:#fff;color:#24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49\">WITH<\/span><span style=\"color:#24292E\"> tile_data <\/span><span style=\"color:#D73A49\">AS<\/span><span style=\"color:#24292E\"> (<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  SELECT<\/span><span style=\"color:#24292E\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    'geometry'<\/span><span style=\"color:#24292E\">: ST_AsMVTGeom(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      ST_Transform(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">        ST_SimplifyPreserveTopology(<\/span><span style=\"color:#032F62\">\"geom\"<\/span><span style=\"color:#24292E\">, ${simplify}),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">        'EPSG:4326'<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#032F62\">'EPSG:3857'<\/span><span style=\"color:#24292E\">, true<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      ),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      ST_Extent(ST_TileEnvelope(${z}, ${x}, ${y})),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#005CC5\">      4096<\/span><span style=\"color:#24292E\">,    <\/span><span style=\"color:#6A737D\">-- extent\uff08MVT\u6a19\u6e96\uff09<\/span><\/span>\n<span class=\"line\"><span style=\"color:#005CC5\">      0<\/span><span style=\"color:#24292E\">,       <\/span><span style=\"color:#6A737D\">-- buffer\uff08\u5fc5\u8981\u306b\u5fdc\u3058\u3066 64 \u306a\u3069\u3092\u691c\u8a0e\uff09<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      false<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    ),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#6A737D\">    -- \u30d7\u30ed\u30d1\u30c6\u30a3\u306fMVT\u304c\u53d7\u3051\u4ed8\u3051\u308b\u578b\u3078\u30ad\u30e3\u30b9\u30c8<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    'name'<\/span><span style=\"color:#24292E\">: <\/span><span style=\"color:#005CC5\">TRY_CAST<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">\"name\"<\/span><span style=\"color:#D73A49\"> AS<\/span><span style=\"color:#D73A49\"> VARCHAR<\/span><span style=\"color:#24292E\">),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    'value'<\/span><span style=\"color:#24292E\">: <\/span><span style=\"color:#005CC5\">TRY_CAST<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">\"value\"<\/span><span style=\"color:#D73A49\"> AS<\/span><span style=\"color:#D73A49\"> INTEGER<\/span><span style=\"color:#24292E\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">  } <\/span><span style=\"color:#D73A49\">AS<\/span><span style=\"color:#24292E\"> feature<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  FROM<\/span><span style=\"color:#24292E\"> ${<\/span><span style=\"color:#D73A49\">table<\/span><span style=\"color:#24292E\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  WHERE<\/span><span style=\"color:#032F62\"> \"geom\"<\/span><span style=\"color:#D73A49\"> IS NOT NULL<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">    AND<\/span><span style=\"color:#24292E\"> ST_Intersects(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      ST_Transform(<\/span><span style=\"color:#032F62\">\"geom\"<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#032F62\">'EPSG:4326'<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#032F62\">'EPSG:3857'<\/span><span style=\"color:#24292E\">, true),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">      ST_TileEnvelope(${z}, ${x}, ${y})<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    )<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  LIMIT<\/span><span style=\"color:#005CC5\"> 50000<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">SELECT<\/span><span style=\"color:#24292E\"> ST_AsMVT(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">  feature,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">  'default'<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#6A737D\">-- \u30ec\u30a4\u30e4\u30fc\u540d<\/span><\/span>\n<span class=\"line\"><span style=\"color:#005CC5\">  4096<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">  'geometry'<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">) <\/span><span style=\"color:#D73A49\">AS<\/span><span style=\"color:#24292E\"> mvt<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">FROM<\/span><span style=\"color:#24292E\"> tile_data<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">WHERE<\/span><span style=\"color:#005CC5\"> feature<\/span><span style=\"color:#24292E\">.<\/span><span style=\"color:#005CC5\">geometry<\/span><span style=\"color:#D73A49\"> IS NOT NULL<\/span><span style=\"color:#D73A49\"> AND<\/span><span style=\"color:#D73A49\"> NOT<\/span><span style=\"color:#24292E\"> ST_IsEmpty(<\/span><span style=\"color:#005CC5\">feature<\/span><span style=\"color:#24292E\">.<\/span><span style=\"color:#005CC5\">geometry<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"\/><\/code><\/pre>\n<p>\u5b9f\u88c5\u4e0a\u306e\u30dd\u30a4\u30f3\u30c8\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u5ea7\u6a19\u9806\u5e8f\u306e\u7f60\u3092\u907f\u3051\u308b\u305f\u3081\u3001<code>ST_Transform<\/code> \u306e\u7b2c4\u5f15\u6570 <code>always_xy<\/code> \u3092 true \u306b\u8a2d\u5b9a\u3057\u3001\u5e38\u306b <code>lon,lat<\/code> \u9806\u5e8f\u3068\u3059\u308b<\/li>\n<li><code>extent<\/code> \u306f\u30bf\u30a4\u30eb\u5185\u306e\u4eee\u60f3\u5ea7\u6a19\u89e3\u50cf\u5ea6\uff08\u6574\u6570\u683c\u5b50\uff09\u3002MVT\u3067\u306f\u4e8b\u5b9f\u4e0a 4096 \u304c\u6a19\u6e96<\/li>\n<li><code>buffer<\/code> \u306f\u96a3\u63a5\u30bf\u30a4\u30eb\u8de8\u304e\u306e\u898b\u5207\u308c\u9632\u6b62\u306e\u4f59\u767d\uff08extent \u3068\u540c\u3058\u5ea7\u6a19\u7cfb\uff09\u3002\u4f8b\uff1a <code>extent=4096<\/code>  \u3067 <code>buffer=64<\/code> \u306a\u3069<\/li>\n<li>MapLibre GL JS\u306e <code>tileSize<\/code>\uff08\u65e2\u5b9a 512px\uff09\u306f\u753b\u9762\u63cf\u753b\u306e\u8ad6\u7406\u30b5\u30a4\u30ba\u3067\u3042\u308a\u3001MVT\u306e <code>extent<\/code>\uff0f <code>buffer<\/code> \u3068\u306f\u5225\u6982\u5ff5<\/li>\n<li>MVT\u30d7\u30ed\u30d1\u30c6\u30a3\u578b\u306f\u9650\u5b9a\u7684\uff08\u6587\u5b57\u5217\u3001\u6574\u6570\u3001\u6d6e\u52d5\u5c0f\u6570\u3001\u771f\u507d\u5024\u306e\u307f\uff09\u3002DuckDB\u306e\u591a\u69d8\u306a\u578b\u306f <code>TRY_CAST<\/code> \u3067\u5b89\u5168\u306b\u30ad\u30e3\u30b9\u30c8<\/li>\n<li>\u30d5\u30a3\u30fc\u30c1\u30e3\u30fc\u6570\u304c\u591a\u3044\u5834\u5408\u306f <code>LIMIT<\/code> \u3068\u30ba\u30fc\u30e0\u5225\u306e\u7c21\u7565\u5316\u3067\u30bf\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u6291\u5236\uff08\u4f8b\uff1a<code>ST_SimplifyPreserveTopology<\/code>\uff09<\/li>\n<li><code>ST_IsEmpty<\/code> \u3067\u7a7a\u30b8\u30aa\u30e1\u30c8\u30ea\u3092\u9664\u5916<\/li>\n<\/ul>\n<p>DuckDB-WASM\u306e\u30af\u30a8\u30ea\u7d50\u679c\u3068\u3057\u3066 Uint8Array\uff08PBF\uff09\u3092\u5f97\u3066\u3001MapLibre GL JS\u306e\u30ab\u30b9\u30bf\u30e0\u30d7\u30ed\u30c8\u30b3\u30eb\u30cf\u30f3\u30c9\u30e9\u304b\u3089\u305d\u306e\u307e\u307e\u8fd4\u5374\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u6ce8\u610f\u70b9\u304c\u3042\u308a\u307e\u3059\u3002WASM\u30e1\u30e2\u30ea\u306e\u518d\u914d\u7f6e\u306b\u3088\u308b ArrayBuffer detachment \u3092\u907f\u3051\u308b\u305f\u3081\u3001\u8fd4\u5374\u524d\u306b<strong>\u5b89\u5168\u306a\u30b3\u30d4\u30fc<\/strong>\u3092\u53d6\u308b\u3053\u3068\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<pre class=\"shiki github-light\" style=\"background-color:#fff;color:#24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49\">const<\/span><span style=\"color:#005CC5\"> result<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#D73A49\"> await<\/span><span style=\"color:#24292E\"> conn.<\/span><span style=\"color:#6F42C1\">query<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#6A737D\">\/* \u4e0a\u8a18SQL *\/<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">const<\/span><span style=\"color:#005CC5\"> raw<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> result.<\/span><span style=\"color:#6F42C1\">get<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#005CC5\">0<\/span><span style=\"color:#24292E\">)?.mvt <\/span><span style=\"color:#D73A49\">as<\/span><span style=\"color:#6F42C1\"> Uint8Array<\/span><span style=\"color:#D73A49\"> |<\/span><span style=\"color:#005CC5\"> undefined<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">if<\/span><span style=\"color:#24292E\"> (<\/span><span style=\"color:#D73A49\">!<\/span><span style=\"color:#24292E\">raw <\/span><span style=\"color:#D73A49\">||<\/span><span style=\"color:#24292E\"> raw.<\/span><span style=\"color:#005CC5\">length<\/span><span style=\"color:#D73A49\"> ===<\/span><span style=\"color:#005CC5\"> 0<\/span><span style=\"color:#24292E\">) <\/span><span style=\"color:#D73A49\">return<\/span><span style=\"color:#D73A49\"> new<\/span><span style=\"color:#6F42C1\"> Uint8Array<\/span><span style=\"color:#24292E\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#6A737D\">\/\/ detachment\u5bfe\u7b56\u3067\u5b89\u5168\u306a\u30b3\u30d4\u30fc<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">return<\/span><span style=\"color:#D73A49\"> new<\/span><span style=\"color:#6F42C1\"> Uint8Array<\/span><span style=\"color:#24292E\">(raw.buffer.<\/span><span style=\"color:#6F42C1\">slice<\/span><span style=\"color:#24292E\">(raw.byteOffset, raw.byteOffset <\/span><span style=\"color:#D73A49\">+<\/span><span style=\"color:#24292E\"> raw.byteLength));<\/span><\/span>\n<span class=\"line\"\/><\/code><\/pre>\n<h2>MapLibre\u3067\u30bf\u30a4\u30eb\u3092\u8868\u793a\u3059\u308b<\/h2>\n<p>MapLibre GL JS\u306b\u306f\u300c\u30d7\u30ed\u30c8\u30b3\u30eb\u300d\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u4f7f\u7528\u3057\u3001\u72ec\u81ea\u30b9\u30ad\u30fc\u30e0\u306eURL\u306b\u5bfe\u3057\u3066\u72ec\u81ea\u306e\u30d0\u30a4\u30c8\u5217\u3092\u8fd4\u3059\u30cf\u30f3\u30c9\u30e9\u3092\u767b\u9332\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002vector \u30bd\u30fc\u30b9\u306e\u5834\u5408\u306fMVT\u306ePBF\u3001raster \u30bd\u30fc\u30b9\u306e\u5834\u5408\u306f\u753b\u50cf\u306e\u30d0\u30a4\u30c8\u5217\u3092\u8fd4\u305b\u3070OK\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001HTTP\u4ee5\u5916\u306e\u7d4c\u8def\u3084\u30aa\u30f3\u30c7\u30de\u30f3\u30c9\u751f\u6210\uff08\u4eca\u56de\u306e\u3088\u3046\u306a\u30d6\u30e9\u30a6\u30b6\u5185DuckDB-WASM\uff09\u3067\u3082\u3001\u901a\u5e38\u306e <code>tiles<\/code> \u8a2d\u5b9a\u3068\u540c\u69d8\u306b\u6271\u3048\u307e\u3059\u3002<\/p>\n<pre class=\"shiki github-light\" style=\"background-color:#fff;color:#24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49\">function<\/span><span style=\"color:#6F42C1\"> parseDuckDBTileUrl<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#E36209\">url<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> string<\/span><span style=\"color:#24292E\">)<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#24292E\"> { <\/span><span style=\"color:#E36209\">tableSpec<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> string<\/span><span style=\"color:#24292E\">; <\/span><span style=\"color:#E36209\">zxy<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#24292E\"> { <\/span><span style=\"color:#E36209\">z<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\">; <\/span><span style=\"color:#E36209\">x<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\">; <\/span><span style=\"color:#E36209\">y<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\"> } } <\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#005CC5\"> null<\/span><span style=\"color:#24292E\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> m<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> url.<\/span><span style=\"color:#6F42C1\">match<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">\/<\/span><span style=\"color:#D73A49\">^<\/span><span style=\"color:#032F62\">duckdb:<\/span><span style=\"color:#22863A;font-weight:bold\">\\\/\\\/<\/span><span style=\"color:#032F62\">(<\/span><span style=\"color:#005CC5\">[<\/span><span style=\"color:#D73A49\">^<\/span><span style=\"color:#22863A;font-weight:bold\">\\\/<\/span><span style=\"color:#005CC5\">]<\/span><span style=\"color:#D73A49\">+<\/span><span style=\"color:#032F62\">)<\/span><span style=\"color:#22863A;font-weight:bold\">\\\/<\/span><span style=\"color:#032F62\">(<\/span><span style=\"color:#005CC5\">\\d<\/span><span style=\"color:#D73A49\">+<\/span><span style=\"color:#032F62\">)<\/span><span style=\"color:#22863A;font-weight:bold\">\\\/<\/span><span style=\"color:#032F62\">(<\/span><span style=\"color:#005CC5\">\\d<\/span><span style=\"color:#D73A49\">+<\/span><span style=\"color:#032F62\">)<\/span><span style=\"color:#22863A;font-weight:bold\">\\\/<\/span><span style=\"color:#032F62\">(<\/span><span style=\"color:#005CC5\">\\d<\/span><span style=\"color:#D73A49\">+<\/span><span style=\"color:#032F62\">)<\/span><span style=\"color:#22863A;font-weight:bold\">\\.<\/span><span style=\"color:#032F62\">pbf<\/span><span style=\"color:#D73A49\">$<\/span><span style=\"color:#032F62\">\/<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  if<\/span><span style=\"color:#24292E\"> (<\/span><span style=\"color:#D73A49\">!<\/span><span style=\"color:#24292E\">m) <\/span><span style=\"color:#D73A49\">return<\/span><span style=\"color:#005CC5\"> null<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#24292E\"> [, <\/span><span style=\"color:#005CC5\">tableSpec<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#005CC5\">z<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#005CC5\">x<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#005CC5\">y<\/span><span style=\"color:#24292E\">] <\/span><span style=\"color:#D73A49\">=<\/span><span style=\"color:#24292E\"> m;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  return<\/span><span style=\"color:#24292E\"> { tableSpec, zxy: { z: <\/span><span style=\"color:#D73A49\">+<\/span><span style=\"color:#24292E\">z, x: <\/span><span style=\"color:#D73A49\">+<\/span><span style=\"color:#24292E\">x, y: <\/span><span style=\"color:#D73A49\">+<\/span><span style=\"color:#24292E\">y } };<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">}<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">async<\/span><span style=\"color:#D73A49\"> function<\/span><span style=\"color:#6F42C1\"> generateVectorTile<\/span><span style=\"color:#24292E\">(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  conn<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#6F42C1\"> AsyncDuckDBConnection<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  tableName<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> string<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  zxy<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#24292E\"> { <\/span><span style=\"color:#E36209\">z<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\">; <\/span><span style=\"color:#E36209\">x<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\">; <\/span><span style=\"color:#E36209\">y<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\"> },<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  geomCol<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#032F62\"> 'geom'<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  selectedProps<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> string<\/span><span style=\"color:#24292E\">[] <\/span><span style=\"color:#D73A49\">=<\/span><span style=\"color:#24292E\"> [],<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  columnTypes<\/span><span style=\"color:#D73A49\">?:<\/span><span style=\"color:#6F42C1\"> Record<\/span><span style=\"color:#24292E\"><span style=\"color:#005CC5\">string<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#005CC5\">string<\/span><span style=\"color:#D73A49\"> |<\/span><span style=\"color:#005CC5\"> null<\/span><span style=\"color:#24292E\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">)<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#6F42C1\"> Promise<\/span><span style=\"color:#24292E\"><span style=\"color:#6F42C1\">Uint8Array<\/span><span style=\"color:#24292E\">&gt; {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> simplify<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#6F42C1\"> calculateSimplifyTolerance<\/span><span style=\"color:#24292E\">(zxy.z);<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">\tconst<\/span><span style=\"color:#005CC5\"> safeTableName<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> tableName.<\/span><span style=\"color:#6F42C1\">replace<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">\/\"\/<\/span><span style=\"color:#D73A49\">g<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#032F62\">'\"\"'<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> propStruct<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> selectedProps<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    .<\/span><span style=\"color:#6F42C1\">map<\/span><span style=\"color:#24292E\">((<\/span><span style=\"color:#E36209\">col<\/span><span style=\"color:#24292E\">) <\/span><span style=\"color:#D73A49\">=&gt;<\/span><span style=\"color:#24292E\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      const<\/span><span style=\"color:#005CC5\"> type<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> columnTypes?.[col]?.<\/span><span style=\"color:#6F42C1\">toUpperCase<\/span><span style=\"color:#24292E\">() <\/span><span style=\"color:#D73A49\">??<\/span><span style=\"color:#032F62\"> ''<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      const<\/span><span style=\"color:#005CC5\"> key<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> col.<\/span><span style=\"color:#6F42C1\">replace<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">\/'\/<\/span><span style=\"color:#D73A49\">g<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#032F62\">\"''\"<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      const<\/span><span style=\"color:#005CC5\"> isComplex<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#032F62\"> \/(STRUCT<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#032F62\">LIST<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#22863A;font-weight:bold\">\\[\\]<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#032F62\">MAP<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#032F62\">JSON<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#032F62\">UNION)\/<\/span><span style=\"color:#24292E\">.<\/span><span style=\"color:#6F42C1\">test<\/span><span style=\"color:#24292E\">(type);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      const<\/span><span style=\"color:#005CC5\"> intTarget<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#032F62\"> \/<\/span><span style=\"color:#D73A49\">^<\/span><span style=\"color:#032F62\">(TINYINT<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#032F62\">SMALLINT<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#032F62\">UTINYINT<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#032F62\">USMALLINT)<\/span><span style=\"color:#D73A49\">$<\/span><span style=\"color:#032F62\">\/<\/span><span style=\"color:#24292E\">.<\/span><span style=\"color:#6F42C1\">test<\/span><span style=\"color:#24292E\">(type)<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">        ?<\/span><span style=\"color:#032F62\"> 'INTEGER'<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">        :<\/span><span style=\"color:#032F62\"> \/<\/span><span style=\"color:#D73A49\">^<\/span><span style=\"color:#032F62\">(HUGEINT<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#032F62\">UHUGEINT<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#032F62\">UINTEGER<\/span><span style=\"color:#D73A49\">|<\/span><span style=\"color:#032F62\">UBIGINT)<\/span><span style=\"color:#D73A49\">$<\/span><span style=\"color:#032F62\">\/<\/span><span style=\"color:#24292E\">.<\/span><span style=\"color:#6F42C1\">test<\/span><span style=\"color:#24292E\">(type)<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">        ?<\/span><span style=\"color:#032F62\"> 'BIGINT'<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">        :<\/span><span style=\"color:#005CC5\"> null<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      const<\/span><span style=\"color:#005CC5\"> expr<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> isComplex<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">        ?<\/span><span style=\"color:#032F62\"> `TRY_CAST(\"${<\/span><span style=\"color:#24292E\">col<\/span><span style=\"color:#032F62\">}\" AS VARCHAR)`<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">        :<\/span><span style=\"color:#24292E\"> intTarget<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">        ?<\/span><span style=\"color:#032F62\"> `TRY_CAST(\"${<\/span><span style=\"color:#24292E\">col<\/span><span style=\"color:#032F62\">}\" AS ${<\/span><span style=\"color:#24292E\">intTarget<\/span><span style=\"color:#032F62\">})`<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">        :<\/span><span style=\"color:#032F62\"> `\"${<\/span><span style=\"color:#24292E\">col<\/span><span style=\"color:#032F62\">}\"`<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">      return<\/span><span style=\"color:#032F62\"> `'${<\/span><span style=\"color:#24292E\">key<\/span><span style=\"color:#032F62\">}': ${<\/span><span style=\"color:#24292E\">expr<\/span><span style=\"color:#032F62\">}`<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    })<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    .<\/span><span style=\"color:#6F42C1\">join<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">', '<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> sql<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#032F62\"> `WITH tile_data AS (<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    SELECT {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">      'geometry': ST_AsMVTGeom(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">        ST_Transform(ST_SimplifyPreserveTopology(\"${<\/span><span style=\"color:#24292E\">geomCol<\/span><span style=\"color:#032F62\">}\", ${<\/span><span style=\"color:#24292E\">simplify<\/span><span style=\"color:#032F62\">}), 'EPSG:4326', 'EPSG:3857', true),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">        ST_Extent(ST_TileEnvelope(${<\/span><span style=\"color:#24292E\">zxy<\/span><span style=\"color:#032F62\">.<\/span><span style=\"color:#24292E\">z<\/span><span style=\"color:#032F62\">}, ${<\/span><span style=\"color:#24292E\">zxy<\/span><span style=\"color:#032F62\">.<\/span><span style=\"color:#24292E\">x<\/span><span style=\"color:#032F62\">}, ${<\/span><span style=\"color:#24292E\">zxy<\/span><span style=\"color:#032F62\">.<\/span><span style=\"color:#24292E\">y<\/span><span style=\"color:#032F62\">})),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">        4096,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">        0,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">        false<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">      )${<\/span><span style=\"color:#24292E\">propStruct<\/span><span style=\"color:#D73A49\"> ?<\/span><span style=\"color:#032F62\"> `, ${<\/span><span style=\"color:#24292E\">propStruct<\/span><span style=\"color:#032F62\">}`<\/span><span style=\"color:#D73A49\"> :<\/span><span style=\"color:#032F62\"> ''}<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    } AS feature<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    FROM \"${<\/span><span style=\"color:#24292E\">safeTableName<\/span><span style=\"color:#032F62\">}\"<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    WHERE \"${<\/span><span style=\"color:#24292E\">geomCol<\/span><span style=\"color:#032F62\">}\" IS NOT NULL<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">      AND ST_Intersects(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">        ST_Transform(\"${<\/span><span style=\"color:#24292E\">geomCol<\/span><span style=\"color:#032F62\">}\", 'EPSG:4326', 'EPSG:3857', true),<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">        ST_TileEnvelope(${<\/span><span style=\"color:#24292E\">zxy<\/span><span style=\"color:#032F62\">.<\/span><span style=\"color:#24292E\">z<\/span><span style=\"color:#032F62\">}, ${<\/span><span style=\"color:#24292E\">zxy<\/span><span style=\"color:#032F62\">.<\/span><span style=\"color:#24292E\">x<\/span><span style=\"color:#032F62\">}, ${<\/span><span style=\"color:#24292E\">zxy<\/span><span style=\"color:#032F62\">.<\/span><span style=\"color:#24292E\">y<\/span><span style=\"color:#032F62\">})<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">      )<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">    LIMIT 50000<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">  )<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">  SELECT ST_AsMVT(feature, 'default', 4096, 'geometry') AS mvt<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">  FROM tile_data<\/span><\/span>\n<span class=\"line\"><span style=\"color:#032F62\">  WHERE feature.geometry IS NOT NULL AND NOT ST_IsEmpty(feature.geometry);`<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> result<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#D73A49\"> await<\/span><span style=\"color:#24292E\"> conn.<\/span><span style=\"color:#6F42C1\">query<\/span><span style=\"color:#24292E\">(sql);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> tile<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> result.<\/span><span style=\"color:#6F42C1\">get<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#005CC5\">0<\/span><span style=\"color:#24292E\">)?.mvt <\/span><span style=\"color:#D73A49\">as<\/span><span style=\"color:#6F42C1\"> Uint8Array<\/span><span style=\"color:#D73A49\"> |<\/span><span style=\"color:#005CC5\"> undefined<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  if<\/span><span style=\"color:#24292E\"> (<\/span><span style=\"color:#D73A49\">!<\/span><span style=\"color:#24292E\">tile <\/span><span style=\"color:#D73A49\">||<\/span><span style=\"color:#24292E\"> tile.<\/span><span style=\"color:#005CC5\">length<\/span><span style=\"color:#D73A49\"> ===<\/span><span style=\"color:#005CC5\"> 0<\/span><span style=\"color:#24292E\">) <\/span><span style=\"color:#D73A49\">return<\/span><span style=\"color:#D73A49\"> new<\/span><span style=\"color:#6F42C1\"> Uint8Array<\/span><span style=\"color:#24292E\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  return<\/span><span style=\"color:#D73A49\"> new<\/span><span style=\"color:#6F42C1\"> Uint8Array<\/span><span style=\"color:#24292E\">(tile.buffer.<\/span><span style=\"color:#6F42C1\">slice<\/span><span style=\"color:#24292E\">(tile.byteOffset, tile.byteOffset <\/span><span style=\"color:#D73A49\">+<\/span><span style=\"color:#24292E\"> tile.byteLength));<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">}<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#24292E\">maplibregl.<\/span><span style=\"color:#6F42C1\">addProtocol<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#032F62\">'duckdb'<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#D73A49\">async<\/span><span style=\"color:#24292E\"> (<\/span><span style=\"color:#E36209\">params<\/span><span style=\"color:#24292E\">) <\/span><span style=\"color:#D73A49\">=&gt;<\/span><span style=\"color:#24292E\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> parsed<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#6F42C1\"> parseDuckDBTileUrl<\/span><span style=\"color:#24292E\">(params.url);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  if<\/span><span style=\"color:#24292E\"> (<\/span><span style=\"color:#D73A49\">!<\/span><span style=\"color:#24292E\">parsed) <\/span><span style=\"color:#D73A49\">return<\/span><span style=\"color:#24292E\"> { data: <\/span><span style=\"color:#D73A49\">new<\/span><span style=\"color:#6F42C1\"> Uint8Array<\/span><span style=\"color:#24292E\">() };<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#24292E\"> { <\/span><span style=\"color:#005CC5\">tableSpec<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#005CC5\">zxy<\/span><span style=\"color:#24292E\"> } <\/span><span style=\"color:#D73A49\">=<\/span><span style=\"color:#24292E\"> parsed;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> mvt<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#D73A49\"> await<\/span><span style=\"color:#6F42C1\"> generateVectorTile<\/span><span style=\"color:#24292E\">(conn, tableSpec, zxy, <\/span><span style=\"color:#032F62\">'geom'<\/span><span style=\"color:#24292E\">, [<\/span><span style=\"color:#032F62\">'name'<\/span><span style=\"color:#24292E\">, <\/span><span style=\"color:#032F62\">'value'<\/span><span style=\"color:#24292E\">]);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  return<\/span><span style=\"color:#24292E\"> { data: mvt };<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">});<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">function<\/span><span style=\"color:#6F42C1\"> calculateSimplifyTolerance<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#E36209\">zoom<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\">)<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  if<\/span><span style=\"color:#24292E\"> (zoom <\/span><span style=\"color:#D73A49\">&gt;=<\/span><span style=\"color:#005CC5\"> 15<\/span><span style=\"color:#24292E\">) <\/span><span style=\"color:#D73A49\">return<\/span><span style=\"color:#005CC5\"> 0<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> maxSimplify<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#005CC5\"> 0.001<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> t<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> Math.<\/span><span style=\"color:#6F42C1\">max<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#005CC5\">0<\/span><span style=\"color:#24292E\">, Math.<\/span><span style=\"color:#6F42C1\">min<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#005CC5\">1<\/span><span style=\"color:#24292E\">, zoom <\/span><span style=\"color:#D73A49\">\/<\/span><span style=\"color:#005CC5\"> 15<\/span><span style=\"color:#24292E\">));<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  return<\/span><span style=\"color:#D73A49\"> +<\/span><span style=\"color:#24292E\">(maxSimplify <\/span><span style=\"color:#D73A49\">*<\/span><span style=\"color:#24292E\"> (<\/span><span style=\"color:#005CC5\">1<\/span><span style=\"color:#D73A49\"> -<\/span><span style=\"color:#24292E\"> t)).<\/span><span style=\"color:#6F42C1\">toFixed<\/span><span style=\"color:#24292E\">(<\/span><span style=\"color:#005CC5\">6<\/span><span style=\"color:#24292E\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">}<\/span><\/span>\n<span class=\"line\"\/><\/span><\/span><\/code><\/pre>\n<h2>\u691c\u8a3c\u7d50\u679c<\/h2>\n<p>\u4e0a\u8a18\u3092\u5b9f\u88c5\u3057\u3001\u56fd\u571f\u6570\u5024\u60c5\u5831\u306e\u90fd\u9053\u5e9c\u770c\u306e\u30dd\u30ea\u30b4\u30f3\u30c7\u30fc\u30bf\u3067\u691c\u8a3c\u3057\u305f\u3068\u3053\u308d\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u793a\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/reearth.engineering\/static\/2aa16e0f-b165-819e-afb3-f8cfc28aef72.webp\" alt=\"\"\/><\/p>\n<p>\u5b9f\u88c5\u3084\u30c7\u30e2\u30da\u30fc\u30b8\u306f\u3053\u3061\u3089\u304b\u3089\u304a\u8a66\u3057\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u672c\u7a3f\u3067\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u5185\u3067DuckDB-WASM\u3092\u7528\u3044\u3001SQL\u306e\u7d50\u679c\u3092\u305d\u306e\u5834\u3067MVT\u306b\u5909\u63db\u3057\u3001MapLibre GL JS\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u6a5f\u80fd\u3067\u63cf\u753b\u3059\u308b\u624b\u6cd5\u3092\u793a\u3057\u307e\u3057\u305f\u3002\u4e8b\u524d\u5909\u63db\u3084\u5c02\u7528\u30bf\u30a4\u30eb\u914d\u4fe1\u30a4\u30f3\u30d5\u30e9\u306b\u4f9d\u5b58\u305b\u305a\u3001\u30aa\u30f3\u30c7\u30de\u30f3\u30c9\u3067\u9ad8\u901f\u304b\u3064\u67d4\u8edf\u306b\u53ef\u8996\u5316\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>DuckDB\u306espatial\u62e1\u5f35\u3068 <code>ST_AsMVT<\/code> \/ <code>ST_AsMVTGeom<\/code> \u3092\u76f4\u63a5\u6d3b\u7528\u3057\u3001GeoJSON\u2192MVT\u5909\u63db\u306e\u4e2d\u9593\u5de5\u7a0b\u3092\u6392\u9664\u3057\u3001<code>addProtocol<\/code> \u306b\u3088\u3063\u3066 <code>duckdb:\/\/<\/code> \u30b9\u30ad\u30fc\u30e0\u7d4c\u7531\u3067\u30aa\u30f3\u30c7\u30de\u30f3\u30c9MVT\u4f9b\u7d66\u3092\u5b9f\u73fe\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u3001<\/p>\n<ul>\n<li>\u30af\u30a8\u30ea\u5909\u66f4\u304c\u305d\u306e\u307e\u307e\u30bf\u30a4\u30eb\u306b\u53cd\u6620\u3055\u308c\u3001\u63a2\u7d22\u7684\u5206\u6790\u306e\u53cd\u5fa9\u304c\u901f\u3044<\/li>\n<li>\u30bf\u30a4\u30eb\u751f\u6210\u30fb\u914d\u4fe1\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u3084\u30b9\u30c8\u30ec\u30fc\u30b8\u904b\u7528\u306e\u8ca0\u62c5\u3092\u6700\u5c0f\u5316<\/li>\n<li>\u4efb\u610f\u30b9\u30ad\u30fc\u30de\u3001\u6d3e\u751f\u5217\u3001\u7a7a\u9593\u7d50\u5408\u3001\u96c6\u8a08\u3092SQL\u3067\u76f4\u66f8\u304d\u3067\u304d\u308b<\/li>\n<\/ul>\n<p>\u3068\u3044\u3063\u305f\u67d4\u8edf\u6027\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4e21\u7acb\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4eca\u5f8c\u306e\u8ab2\u984c\uff1a<\/p>\n<ul>\n<li>\u30d6\u30e9\u30a6\u30b6\u30e1\u30e2\u30ea\u306b\u4f9d\u5b58\u3059\u308b\u305f\u3081\u3001\u8d85\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306f\u524d\u51e6\u7406\uff08Parquet\u5316\u3001\u5217\u524a\u6e1b\u3001\u4e8b\u524d\u96c6\u7d04\uff09\u304c\u63a8\u5968\u3002\u8907\u96d1\u306a\u30b8\u30aa\u30e1\u30c8\u30ea\u3084\u6975\u5c0f\u30dd\u30ea\u30b4\u30f3\u304c\u5bc6\u96c6\u3059\u308b\u30c7\u30fc\u30bf\u306f\u63cf\u753b\u30b9\u30d4\u30fc\u30c9\u304c\u6975\u7aef\u306b\u4f4e\u4e0b\u3059\u308b\u305f\u3081\u6700\u9069\u5316\u304c\u5fc5\u8981<\/li>\n<li>\u30ab\u30b9\u30bf\u30e0\u30d7\u30ed\u30c8\u30b3\u30eb\u306f\u30ea\u30af\u30a8\u30b9\u30c8\u30ad\u30e3\u30f3\u30bb\u30eb\u3084\u540c\u6642\u5b9f\u884c\u5236\u5fa1\u3078\u306e\u914d\u616e\u304c\u5fc5\u8981<\/li>\n<li>\u3055\u3089\u306a\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a\u306b\u306f\u30d7\u30ed\u30c8\u30b3\u30eb\u5c64\u3067\u306eMVT\u30ad\u30e3\u30c3\u30b7\u30e5\u5b9f\u88c5\u304c\u6709\u52b9<\/li>\n<\/ul>\n<h2>\u53c2\u8003\u8cc7\u6599<\/h2>\n<h2>\u53c2\u8003\uff1aGeoJSON\u304b\u3089\u30d9\u30af\u30bf\u30fc\u30bf\u30a4\u30eb\u3078\u306e\u5909\u63db<\/h2>\n<p>DuckDB\u304b\u3089\u53d6\u5f97\u3057\u305fGeoJSON\u30c7\u30fc\u30bf\u3092\u3001MapLibre GL JS\u304c\u7406\u89e3\u3067\u304d\u308b\u30d9\u30af\u30bf\u30fc\u30bf\u30a4\u30eb\uff08MVT\/PBF\uff09\u306b\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001<code>geojson-vt<\/code> \u3068 <code>vt-pbf<\/code> \u304c\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<pre class=\"shiki github-light\" style=\"background-color:#fff;color:#24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49\">import<\/span><span style=\"color:#24292E\"> geojsonvt <\/span><span style=\"color:#D73A49\">from<\/span><span style=\"color:#032F62\"> 'geojson-vt'<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">import<\/span><span style=\"color:#24292E\"> vtpbf <\/span><span style=\"color:#D73A49\">from<\/span><span style=\"color:#032F62\"> 'vt-pbf'<\/span><span style=\"color:#24292E\">;<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">export<\/span><span style=\"color:#D73A49\"> function<\/span><span style=\"color:#6F42C1\"> geojsonToVectorTile<\/span><span style=\"color:#24292E\">(<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  features<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#6F42C1\"> Feature<\/span><span style=\"color:#24292E\">[],<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  z<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  x<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E36209\">  y<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#005CC5\"> number<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">)<\/span><span style=\"color:#D73A49\">:<\/span><span style=\"color:#6F42C1\"> Uint8Array<\/span><span style=\"color:#24292E\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> tileIndex<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#6F42C1\"> geojsonvt<\/span><span style=\"color:#24292E\">({ type: <\/span><span style=\"color:#032F62\">'FeatureCollection'<\/span><span style=\"color:#24292E\">, features }, {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    generateId: <\/span><span style=\"color:#005CC5\">true<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    indexMaxZoom: z,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    maxZoom: z,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    buffer: <\/span><span style=\"color:#005CC5\">0<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    tolerance: <\/span><span style=\"color:#005CC5\">0<\/span><span style=\"color:#24292E\">,<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">    extent: <\/span><span style=\"color:#005CC5\">4096<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">  });<\/span><\/span>\n<span class=\"line\"\/>\n<span class=\"line\"><span style=\"color:#D73A49\">  const<\/span><span style=\"color:#005CC5\"> tile<\/span><span style=\"color:#D73A49\"> =<\/span><span style=\"color:#24292E\"> tileIndex.<\/span><span style=\"color:#6F42C1\">getTile<\/span><span style=\"color:#24292E\">(z, x, y);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  if<\/span><span style=\"color:#24292E\"> (<\/span><span style=\"color:#D73A49\">!<\/span><span style=\"color:#24292E\">tile) <\/span><span style=\"color:#D73A49\">return<\/span><span style=\"color:#D73A49\"> new<\/span><span style=\"color:#6F42C1\"> Uint8Array<\/span><span style=\"color:#24292E\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#D73A49\">  return<\/span><span style=\"color:#24292E\"> vtpbf.<\/span><span style=\"color:#6F42C1\">fromGeojsonVt<\/span><span style=\"color:#24292E\">({ default: tile });<\/span><\/span>\n<span class=\"line\"><span style=\"color:#24292E\">}<\/span><\/span>\n<span class=\"line\"\/><\/code><\/pre>\n<\/div>\n\n<br \/><a href=\"https:\/\/reearth.engineering\/posts\/duckdb-wasm-mvt-ja\/\">\u5143\u306e\u8a18\u4e8b\u3092\u78ba\u8a8d\u3059\u308b <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"CTO\u306e\u4e95\u4e0a\u3067\u3059\u3002\u5f0a\u793e\u3067\u306f\u73fe\u5728\u3001\u5730\u7406\u7a7a\u9593\u30c7\u30fc\u30bf\u3092\u542b\u3080\u591a\u69d8\u306a\u30c7\u30fc\u30bf\u3092\u6271\u3046\u65b0\u3057\u3044Web\u4e0a\u3067\u306eBI\u30c4\u30fc\u30eb\u306e\u958b\u767a\u306b\u53d6\u308a\u7d44\u3093\u3067\u304a\u308a\u3001\u305d\u306e\u4e00\u74b0\u3068\u3057\u3066\u3001GIS\u30c7\u30fc\u30bf\u306e\u53ef\u8996\u5316\u6a5f\u80fd\u306b\u95a2\u3059\u308bPoC\u3092\u9032\u3081\u3066\u3044\u307e\u3059\u3002 WebGIS\u306b\u304a\u3051\u308b\u5730\u56f3\u4e0a [&hellip;]","protected":false},"author":1,"featured_media":23949,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-23948","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-company-tec"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u4e8b\u524d\u5909\u63db\u4e0d\u8981\uff01DuckDB\u306bGIS\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3093\u3067\u30d9\u30af\u30bf\u30fc\u30bf\u30a4\u30eb\u3092\u8868\u793a\u3059\u308b | Re:Earth Engineering - \u30dd\u30b1\u30b3\u30f3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/reearth.engineering\/posts\/duckdb-wasm-mvt-ja\/\" \/>\n<meta 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