gdal3.js is a port of Gdal applications (gdal_translate, ogr2ogr, gdal_rasterize, gdalwarp, gdaltransform) to Webassembly. It allows you to convert raster and vector geospatial data to various formats and coordinate systems.
gdal3.js uses emscripten to compile Gdal, proj, geos, spatialite, sqlite, geotiff, tiff, webp, expat, zlib and iconv to webassembly.
If you are building a native application in JavaScript (using Electron for instance), or are working in node.js, you will likely prefer to use a native binding of Gdal to JavaScript. A native binding will be faster because it will run native code.
gdal3.js GUI
gdal3.js GUI is a web application that provides a gui to gdal_translate, ogr2ogr and gdal_rasterize applications to be used online. Uses gdal3.js in the background. It runs on the browser and files are converted on the client side.
Read & Write
AAIGrid, ADRG, ARG, BLX, BMP, BT, BYN, CALS, CTable2, DTED, EHdr, ELAS, ENVI, ERS, FIT, GIF, GPKG, GRIB, GS7BG, GSAG, GSBG, GTX, GTiff, HF2, HFA, ILWIS, ISCE, ISIS2, ISIS3, JPEG, KMLSUPEROVERLAY, KRO, LAN, LCP, Leveller, MBTiles, MEM, MFF, MFF2, MRF, NITF, NTv2, NWT_GRD, OpenFileGDB, PAux, PCIDSK, PCRaster, PDS4, PNG, PNM, R, RMF, ROI_PAC, RRASTER, RST, Rasterlite, SAGA, SGI, SIGDEM, SRTMHGT, Terragen, USGSDEM, VICAR, VRT, WEBP, WMTS, XPM, XYZ, ZMap, Zarr
Read Only
ACE2, AIG, AirSAR, BIGGIF, BSB, CAD, CEOS, COASP, COSAR, CPG, CTG, DERIVED, DIMAP, DIPEx, DOQ1, DOQ2, ECRGTOC, EIR, ESAT, ESRIC, FAST, GFF, GRASSASCIIGrid, GSC, GXF, GenBin, IRIS, ISG, JAXAPALSAR, JDEM, L1B, LOSLAS, MAP, MSGN, NDF, NGSGEOID, NOAA_B, NSIDCbin, NWT_GRC, OZI, PDS, PRF, RIK, RPFTOC, RS2, SAFE, SAR_CEOS, SDTS, SENTINEL2, SNODAS, SRP, STACIT, STACTA, TGA, TIL, TSX
Write Only
COG, PDF
Read & Write
CSV, DGN, DXF, ESRI Shapefile, FlatGeobuf, GML, GPKG, GPX, GeoJSON, GeoJSONSeq, GeoRSS, Geoconcept, JML, JSONFG, KML, MBTiles, MVT, MapInfo File, MapML, Memory, ODS, OGR_GMT, OpenFileGDB, PCIDSK, PDS4, PMTiles, S57, SQLite, Selafin, VDV, VICAR, WAsP, XLSX
Read Only
AVCBin, AVCE00, CAD, EDIGEO, ESRIJSON, GTFS, Idrisi, LVBAG, OGR_PDS, OGR_SDTS, OGR_VRT, OSM, SVG, SXF, TIGER, TopoJSON, UK .NTF, VFK
Write Only
PDF, PGDUMP
Script (CDN)
Note: It doesn't work with web worker.
<script type="text/javascript"
src="https://cdn.jsdelivr.net/npm/[email protected]/dist/package/gdal3.js"
integrity="sha384-yW4c2Jx7lsREjJg58+ZI5U6gAso2bRAPw3LdzPWm7z8+rMJ24R7AS+EFyXDPxgYM"
crossorigin="anonymous"
></script>initGdalJs({ path: 'https://cdn.jsdelivr.net/npm/[email protected]/dist/package', useWorker: false }).then((Gdal) => {});Example: https://github.com/bugra9/gdal3.js/tree/master/apps/example-browser
Script (Local)
<script type="text/javascript" src="gdal3.js"></script>initGdalJs().then((Gdal) => {});Example: https://github.com/bugra9/gdal3.js/tree/master/apps/example-browser-worker
ES Module
<script type="module">
import 'gdal3.js'
initGdalJs().then((Gdal) => {});
</script>Example: https://github.com/bugra9/gdal3.js/tree/master/apps/example-module-browser-worker
Example: https://github.com/bugra9/gdal3.js/tree/master/apps/example-module-browser
Builder such as Webpack (Vue, React, Angular, ...)
pnpm add gdal3.js
# or
yarn add gdal3.js
# or
npm install gdal3.jsimport initGdalJs from 'gdal3.js';
initGdalJs({ path: 'static' }).then((Gdal) => {});plugins: [
new CopyWebpackPlugin({
patterns: [
{ from: '../node_modules/gdal3.js/dist/package/gdal3WebAssembly.wasm', to: 'static' },
{ from: '../node_modules/gdal3.js/dist/package/gdal3WebAssembly.data', to: 'static' }
]
})
]Full working example: https://github.com/bugra9/gdal3.js/blob/master/apps/app-gui/src/App.vue
Vite + Vue3
pnpm add gdal3.js
# or
yarn add gdal3.js
# or
npm install gdal3.js<script setup>
import { ref } from 'vue'
import workerUrl from 'gdal3.js/dist/package/gdal3.js?url'
import dataUrl from 'gdal3.js/dist/package/gdal3WebAssembly.data?url'
import wasmUrl from 'gdal3.js/dist/package/gdal3WebAssembly.wasm?url'
import initGdalJs from 'gdal3.js';
const paths = {
wasm: wasmUrl,
data: dataUrl,
js: workerUrl,
};
const count = ref(0);
initGdalJs({paths}).then((Gdal) => {
count.value = Object.keys(Gdal.drivers.raster).length + Object.keys(Gdal.drivers.vector).length;
});
</script>
<template>
<div>Number of drivers: {{ count }}</div>
</template>Node
pnpm add gdal3.js
# or
yarn add gdal3.js
# or
npm install gdal3.jsconst initGdalJs = require('gdal3.js/node');
initGdalJs().then((Gdal) => {});Example: https://github.com/bugra9/gdal3.js/blob/master/apps/example-node/index.js
const Gdal = await initGdalJs();
const files = ['a.mbtiles', 'b.tif']; // [Vector, Raster]
const result = await Gdal.open(files); // https://gdal3.js.org/docs/module-f_open.html
const mbTilesDataset = result.datasets[0];
const tifDataset = result.datasets[1];
/* ======== Dataset Info ======== */
// https://gdal3.js.org/docs/module-f_getInfo.html
const mbTilesDatasetInfo = await Gdal.getInfo(mbTilesDataset); // Vector
const tifDatasetInfo = await Gdal.getInfo(tifDataset); // Raster
/* ======== Vector translate (mbtiles -> geojson) ======== */
const options = [ // https://gdal.org/programs/ogr2ogr.html#description
'-f', 'GeoJSON',
'-t_srs', 'EPSG:4326'
];
const output = await Gdal.ogr2ogr(mbTilesDataset, options); // https://gdal3.js.org/docs/module-a_ogr2ogr.html
const bytes = await Gdal.getFileBytes(output); // https://gdal3.js.org/docs/module-f_getFileBytes.html
/* ======== Raster translate (tif -> png) ======== */
const options = [ // https://gdal.org/programs/gdal_translate.html#description
'-of', 'PNG'
];
const output = await Gdal.gdal_translate(tifDataset, options); // https://gdal3.js.org/docs/module-a_gdal_translate.html
const bytes = await Gdal.getFileBytes(output); // https://gdal3.js.org/docs/module-f_getFileBytes.html
/* ======== Rasterize (mbtiles -> tif) ======== */
const options = [ // https://gdal.org/programs/gdal_rasterize.html#description
'-of', 'GTiff',
'-co', 'alpha=yes'
];
const output = await Gdal.gdal_rasterize(mbTilesDataset, options); // https://gdal3.js.org/docs/module-a_gdal_rasterize.html
const bytes = await Gdal.getFileBytes(output); // https://gdal3.js.org/docs/module-f_getFileBytes.html
/* ======== Warp (reprojection) ======== */
const options = [ // https://gdal.org/programs/gdalwarp.html#description
'-of', 'GTiff',
'-t_srs', 'EPSG:4326'
];
const output = await Gdal.gdalwarp(tifDataset, options); // https://gdal3.js.org/docs/module-a_gdalwarp.html
const bytes = await Gdal.getFileBytes(output); // https://gdal3.js.org/docs/module-f_getFileBytes.html
// Close all datasets. // https://gdal3.js.org/docs/module-f_close.html
Gdal.close(mbTilesDataset);
Gdal.close(tifDataset);
/* ======== Transform (Coordinate) ======== */
const coords = [
[27.143757, 38.4247972],
];
const options = [ // https://gdal.org/programs/gdaltransform.html#description
'-s_srs', 'EPSG:4326',
'-t_srs', 'EPSG:3857',
'-output_xy',
];
const newCoords = await Gdal.gdaltransform(coords, options); // https://gdal3.js.org/docs/module-a_gdaltransform.html
console.log(newCoords); // [ [ 3021629.2074563554, 4639610.441991095 ] ]- Full working example with worker and Vue.js -> Code, Live
- Browser with Worker -> Code, Live
- Browser without Worker -> Code, Live
- Browser with Worker (Module) -> Code, Live
- Browser without Worker (Module) -> Code, Live
- Node.js -> Code
- Install the EMSDK, as described here
- Install Sqlite3. (#31)
- Run
pnpm install - Run
pnpm run build
GNU Lesser General Public License v2.1 or later
See LICENSE to see the full text.
Compiled with
- Emscripten 3.1.51 (License)
- Gdal 3.8.4 (License)
- Proj 9.3.1 (License)
- Geos 3.12.1 (License)
- Spatialite 5.1.0 (License)
- Sqlite 3.45.1 (License)
- GeoTIFF 1.7.1 (License)
- Tiff 4.6.0 (License)
- WebP 1.3.2 (License)
- Expat 2.6.0 (License)
- Zlib 1.3.1 (License)
- Iconv 1.17 (License)
Inspired by