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geojson-antimeridian-cut
Advanced tools
Readme
GeoJSON is a standard for representing geographic data in a JSON file. Features
and
FeatureCollections
are composed of different geometry objects, including:
LineString
sMultiLineString
sPolygon
sMultiPolygon
sGeometryCollection
sIt is very likely that some geographic data may cross the Antimeridian (180° E or 180° W). RFC 7946 Section 3.1.9 specifies that such objects SHOULD be broken up into two or more objects, none of which cross the antimeridian, and which together are all equivalent. This package implements that splitting.
The API currently provides one function: splitGeoJSON(object)
, which takes any valid GeoJSON
object and, if it crosses the antimeridian, creates a new Object that is equivalent but does not
cross the antimeridian. LineString
s may become MultiLineString
s, and MultiLineString
s will
gain more entries. The same goes for Polygon
s and MultiPolygon
s.
All feature properties and object foreign members are preserved.
Example usage:
const splitGeoJSON = require('geojson-antimeridian-cut');
const lineString = {
type: 'Polygon',
coordinates: [
[
[170, 10],
[170, -10],
[-170, -10],
[-170, 10],
[170, 10],
],
],
};
console.log(splitGeoJSON(lineString));
/*
{
"type": "MultiPolygon",
"coordinates": [
[
[180, 10],
[170, 10],
[170, -10],
[180, -10],
[180, 10]
],
[
[-180, -10],
[-170, -10],
[-170, 10],
[-180, 10],
[-180, -10]
]
]
}
*/
const feature = {
type: 'Feature',
properties: {
name: 'Anchorage to Tokyo',
},
geometry: {
type: 'LineString',
coordinates: [
[-149.89, 61.23],
[-220.29, 35.69],
],
},
};
console.log(splitGeoJSON(feature));
/*
{
"type": "Feature",
"properties": {
"name": "Anchorage to Tokyo"
},
"geometry": {
"type": "MultiLineString",
"coordinates": [
[
[-149.89, 61.23],
[-180, 50.31]
],
[
[-180, 50.31],
[-220.29, 35.69]
]
]
}
}
*/
FAQs
Splits GeoJSON Objects that cross the Antimeridian. See [RFC 7946 Section 3.1.9](https://tools.ietf.org/html/rfc7946#section-3.1.9)
We found that geojson-antimeridian-cut demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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