Created
August 28, 2025 21:32
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PBFからGeoJSONに変換するスクリプト
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| #!/usr/bin/env node | |
| /** | |
| * PBF(MVT) -> GeoJSON | |
| * Usage: node pbf2geojson.js /path/to/{z}/{x}/{y}.pbf > out.geojson | |
| */ | |
| const fs = require('fs'); | |
| const path = require('path'); | |
| const zlib = require('zlib'); | |
| const { VectorTile } = require('@mapbox/vector-tile'); | |
| const Pbf = require('pbf'); | |
| if (process.argv.length < 3) { | |
| console.error('Usage: node pbf2geojson.js /path/to/{z}/{x}/{y}.pbf'); | |
| process.exit(1); | |
| } | |
| const filePath = process.argv[2]; | |
| // z/x/y をパスから推定 | |
| const m = filePath.replace(/\\/g, '/').match(/\/(\d+)\/(\d+)\/(\d+)\.pbf$/); | |
| if (!m) { | |
| console.error('Error: path must end with /{z}/{x}/{y}.pbf'); | |
| process.exit(1); | |
| } | |
| const z = Number(m[1]); | |
| const x = Number(m[2]); | |
| const y = Number(m[3]); | |
| // buffer を読み込み & gzip 判定 | |
| let buf = fs.readFileSync(filePath); | |
| const isGzip = buf[0] === 0x1f && buf[1] === 0x8b; | |
| if (isGzip) buf = zlib.gunzipSync(buf); | |
| // VectorTile をパース | |
| const vt = new VectorTile(new Pbf(buf)); | |
| // 全レイヤーを GeoJSON に | |
| const features = []; | |
| for (const layerName of Object.keys(vt.layers)) { | |
| const layer = vt.layers[layerName]; | |
| for (let i = 0; i < layer.length; i++) { | |
| const f = layer.feature(i).toGeoJSON(x, y, z); | |
| // layer 名を properties に付与（後でフィルタしやすい） | |
| f.properties = { _layer: layerName, ...f.properties }; | |
| features.push(f); | |
| } | |
| } | |
| const fc = { type: 'FeatureCollection', features }; | |
| process.stdout.write(JSON.stringify(fc)); |
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