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turf-union
Advanced tools
Takes two polygons and returns a combined polygon. If the input polygons are not contiguous, this function returns a MultiPolygon feature.
Parameters
poly1
Feature<Polygon> input polygonpoly2
Feature<Polygon> another input polygonExamples
var poly1 = {
"type": "Feature",
"properties": {
"fill": "#0f0"
},
"geometry": {
"type": "Polygon",
"coordinates": [[
[-82.574787, 35.594087],
[-82.574787, 35.615581],
[-82.545261, 35.615581],
[-82.545261, 35.594087],
[-82.574787, 35.594087]
]]
}
};
var poly2 = {
"type": "Feature",
"properties": {
"fill": "#00f"
},
"geometry": {
"type": "Polygon",
"coordinates": [[
[-82.560024, 35.585153],
[-82.560024, 35.602602],
[-82.52964, 35.602602],
[-82.52964, 35.585153],
[-82.560024, 35.585153]
]]
}
};
var polygons = {
"type": "FeatureCollection",
"features": [poly1, poly2]
};
var union = turf.union(poly1, poly2);
//=polygons
//=union
Returns Feature<(Polygon | MultiPolygon)> a combined Polygon or MultiPolygon feature
This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.
Install this module individually:
$ npm install turf-union
Or install the Turf module that includes it as a function:
$ npm install turf
FAQs
find the union of geographic features
The npm package turf-union receives a total of 12,237 weekly downloads. As such, turf-union popularity was classified as popular.
We found that turf-union demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 9 open source maintainers collaborating on the project.
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