@turf/union

union

Takes input (Multi)Polygon(s) and returns a combined polygon. If the input polygons are not contiguous, this function returns a MultiPolygon feature.

Parameters

• polygon1 Feature<(Polygon | MultiPolygon)> input Polygon features

• options Object Optional Parameters (optional, default {})

  • options.properties Object Translate Properties to output Feature (optional, default {})

Examples

var poly1 = turf.polygon([[
    [-82.574787, 35.594087],
    [-82.574787, 35.615581],
    [-82.545261, 35.615581],
    [-82.545261, 35.594087],
    [-82.574787, 35.594087]
]], {"fill": "#0f0"});
var poly2 = turf.polygon([[
    [-82.560024, 35.585153],
    [-82.560024, 35.602602],
    [-82.52964, 35.602602],
    [-82.52964, 35.585153],
    [-82.560024, 35.585153]
]], {"fill": "#00f"});

var union = turf.union(turf.featureCollection([poly1, poly2]));

//addToMap
var addToMap = [poly1, poly2, union];

Returns Feature<(Polygon | MultiPolygon)> a combined Polygon or MultiPolygon feature, or null if the inputs are empty

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.

Installation

Install this single module individually:

$ npm install @turf/union

Or install the all-encompassing @turf/turf module that includes all modules as functions:

$ npm install @turf/turf