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https://github.com/mapbox/geojson-merge
Merge multiple GeoJSON files into one FeatureCollection.
https://github.com/mapbox/geojson-merge
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Merge multiple GeoJSON files into one FeatureCollection.
- Host: GitHub
- URL: https://github.com/mapbox/geojson-merge
- Owner: mapbox
- License: isc
- Created: 2014-07-29T19:22:09.000Z (over 10 years ago)
- Default Branch: master
- Last Pushed: 2020-03-19T13:50:59.000Z (over 4 years ago)
- Last Synced: 2024-10-01T15:07:47.643Z (2 months ago)
- Topics: banished
- Language: JavaScript
- Homepage:
- Size: 18.6 KB
- Stars: 234
- Watchers: 118
- Forks: 33
- Open Issues: 17
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
Awesome Lists containing this project
- awesome-starred - mapbox/geojson-merge - Merge multiple GeoJSON files into one FeatureCollection. (others)
- awesome-frontend-gis - geojson-merge - Merge multiple GeoJSON files into one FeatureCollection.  (👨💻 JavaScript Libraries / Data Processing)
README
# geojson-merge
[](http://travis-ci.org/mapbox/geojson-merge)
Merge multiple [GeoJSON](http://geojson.org/) files into one FeatureCollection.
## install
```bash
$ npm install --save @mapbox/geojson-merge
```
## API
### merge
Merge a series of GeoJSON objects into one FeatureCollection containing all
features in all files. The objects can be any valid GeoJSON root object,
including FeatureCollection, Feature, and Geometry types.
**Parameters**
- `inputs` **[Array](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array)<[Object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object)>** a list of GeoJSON objects of any type
**Examples**
```javascript
var geojsonMerge = require('@mapbox/geojson-merge');
var mergedGeoJSON = geojsonMerge.merge([
{ type: 'Point', coordinates: [0, 1] },
{ type: 'Feature', geometry: { type: 'Point', coordinates: [0, 1] }, properties: {} }
]);
console.log(JSON.stringify(mergedGeoJSON));
```
Returns **[Object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object)** a geojson FeatureCollection.
### mergeFeatureCollectionStream
Merge GeoJSON files containing GeoJSON FeatureCollections
into a single stream of a FeatureCollection as a JSON string.
This is more limited than merge - it only supports FeatureCollections
as input - but more performant, since it can operate on GeoJSON files
larger than what you can keep in memory at one time.
**Parameters**
- `inputs` **[Array](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array)<[string](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)>** a list of filenames of GeoJSON files
**Examples**
```javascript
var geojsonMerge = require('@mapbox/geojson-merge');
var mergedStream = geojsonMerge.mergeFeatureCollectionStream([
'features.geojson',
'otherFeatures.geojson'])
mergedStream.pipe(process.stdout);
```
Returns **[Stream](https://nodejs.org/api/stream.html)** output: a stringified JSON of a FeatureCollection.
## cli
Options:
> `-s` or `--stream` to use the high-performance streaming mode. This allows
> you to combine very large GeoJSON files. Streaming mode requires every
> GeoJSON file to contain a FeatureCollection at the top level.
```bash
$ npm install -g @mapbox/geojson-merge
$ geojson-merge file.geojson otherfile.geojson > combined.geojson
```
## geojson-merge (for dummies)
### Windows Instructions:
1. Start the `node.js` application
2. Open `cmd.exe`
3. Browse to a folder where you'd like `geojson-merge` installed
4. In `cmd.exe` type the install string from above
5. Wait patiently, it could take a moment to start
6. Use `cd node_modules` to change directory to the `node_modules` folder
7. For simplicity sake, move your .geojson files into this `node_modules` directory
8. Run this command to merge your files:
```bash
$ node geojson-merge file1.geojson file2.geojson > merged.geojson
```
**Merging multiple files in a folder**
```bash
$ geojson-merge folder/*.geojson > combined.geojson
```