Package Exports
- geojson-converter
- geojson-converter/dist/index.js
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (geojson-converter) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
geojson-converter
About
Coordinates defined in GeoJSON objects uses WGS 84 projection (EPSG:4326).
Obsolete specifications of GeoJSON (aka GJ2008) allow to specify coordinate reference system (CRS) to use coordinates in others systems, for example, in Web Mercator projection (EPSG:3857).
This module can convert from obsolete specification (aka GJ2008) to (normal) GeoJSON and back.
Module uses proj4 library to translate coordinates (this allow to pecify the projection name and datum if necessary).
Usage example
Install
$ npm install geojson-converter
Usage to normalize GeoJSON:
import {normalize} from 'geojson-converter';
const geoJsonWithCrs = {"type":"FeatureCollection","features":[{"type":"Feature","properties":{"name":"building"},"geometry":{"coordinates":[[[4327063.487520801,7530792.175331439],[4327079.9973121025,7530744.296936532],[4327110.815589298,7530753.652485012],[4327092.104492462,7530803.181859037],[4327063.487520801,7530792.175331439]]],"type":"Polygon"}}],"crs":{"type":"name","properties":{"name":"urn:ogc:def:crs:EPSG::3857"}}};
console.log(normalize(geoJsonWithCrs));
Usage to convert GeoJSON to obsolete schema (with crs attribute):
import {obsolete} from 'geojson-converter';
const geoJson = {"type":"FeatureCollection","features":[{"type":"Feature","properties":{"name":"building"},"geometry":{"coordinates":[[[38.87067266195456,55.86098927010207],[38.8708209719332,55.860747896682426],[38.871097817227536,55.86079506172163],[38.87092973258484,55.861044758032676],[38.87067266195456,55.86098927010207]]],"type":"Polygon"}}]};
console.log(obsolete(geoJson, 'EPSG:102018', '+proj=gnom +lat_0=90 +lon_0=0 +x_0=6300000 +y_0=6300000 +ellps=WGS84 +datum=WGS84 +units=m +no_defs'));
License
MIT