@turf/collect
TypeScript icon, indicating that this package has built-in type declarations

6.5.0 • Public • Published

@turf/collect

collect

Merges a specified property from a FeatureCollection of points into a FeatureCollection of polygons. Given an inProperty on points and an outProperty for polygons, this finds every point that lies within each polygon, collects the inProperty values from those points, and adds them as an array to outProperty on the polygon.

Parameters

Examples

var poly1 = turf.polygon([[[0,0],[10,0],[10,10],[0,10],[0,0]]]);
var poly2 = turf.polygon([[[10,0],[20,10],[20,20],[20,0],[10,0]]]);
var polyFC = turf.featureCollection([poly1, poly2]);
var pt1 = turf.point([5,5], {population: 200});
var pt2 = turf.point([1,3], {population: 600});
var pt3 = turf.point([14,2], {population: 100});
var pt4 = turf.point([13,1], {population: 200});
var pt5 = turf.point([19,7], {population: 300});
var pointFC = turf.featureCollection([pt1, pt2, pt3, pt4, pt5]);
var collected = turf.collect(polyFC, pointFC, 'population', 'values');
var values = collected.features[0].properties.values
//=values => [200, 600]

//addToMap
var addToMap = [pointFC, collected]

Returns FeatureCollection<Polygon> polygons with properties listed based on outField


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 module individually:

$ npm install @turf/collect

Or install the Turf module that includes it as a function:

$ npm install @turf/turf

Package Sidebar

Install

Weekly Downloads

330,411

Version

6.5.0

License

MIT

Unpacked Size

12.9 kB

Total Files

7

Last publish

Collaborators

  • twelch
  • jamesmilneruk
  • rowanwins
  • tmcw
  • morganherlocker
  • tcql
  • mdfedderly