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Merge multipleGeoJSON files into one FeatureCollection.

$ npm install --save @mapbox/geojson-merge

Merge a series of GeoJSON objects into one FeatureCollection containing allfeatures in all files. The objects can be any valid GeoJSON root object,including FeatureCollection, Feature, and Geometry types.

Parameters

• inputsArray<Object> a list of GeoJSON objects of any type

Examples

vargeojsonMerge=require('@mapbox/geojson-merge');varmergedGeoJSON=geojsonMerge.merge([{type:'Point',coordinates:[0,1]},{type:'Feature',geometry:{type:'Point',coordinates:[0,1]},properties:{}}]);console.log(JSON.stringify(mergedGeoJSON));

ReturnsObject a geojson FeatureCollection.

Merge GeoJSON files containing GeoJSON FeatureCollectionsinto a single stream of a FeatureCollection as a JSON string.

This is more limited than merge - it only supports FeatureCollectionsas input - but more performant, since it can operate on GeoJSON fileslarger than what you can keep in memory at one time.

Parameters

• inputsArray<string> a list of filenames of GeoJSON files

Examples

vargeojsonMerge=require('@mapbox/geojson-merge');varmergedStream=geojsonMerge.mergeFeatureCollectionStream(['features.geojson','otherFeatures.geojson'])mergedStream.pipe(process.stdout);

ReturnsStream output: a stringified JSON of a FeatureCollection.

Options:

-s or--stream to use the high-performance streaming mode. This allowsyou to combine very large GeoJSON files. Streaming mode requires everyGeoJSON file to contain a FeatureCollection at the top level.

$ npm install -g @mapbox/geojson-merge$ geojson-merge file.geojson otherfile.geojson> combined.geojson

1. Start thenode.js application
2. Opencmd.exe
3. Browse to a folder where you'd likegeojson-merge installed
4. Incmd.exe type the install string from above
5. Wait patiently, it could take a moment to start
6. Usecd node_modules to change directory to thenode_modules folder
7. For simplicity sake, move your .geojson files into thisnode_modules directory
8. Run this command to merge your files:

$ node geojson-merge file1.geojson file2.geojson> merged.geojson

Merging multiple files in a folder

$ geojson-merge folder/*.geojson> combined.geojson