turf-count

turf-count

Calculates the number of points that fall within a set of polygons.

Install

npm install turf-count

API

count(polygonCollection, pointCollection, countProperty)

• polygonCollection should be a FeatureCollection of Polygons
• pointCollection should be a FeatureCollection of Points
• countProperty is the property in the returned FeatureCollection that records the count of points in each polygon.

Example

var point = require('turf-point')
var polygon = require('turf-polygon')
var featurecollection = require('turf-featurecollection')

var poly1 = polygon([[[0,0],[10,0],[10,10], [0,10]]])
var poly2 = polygon([[[10,0],[20,10],[20,20], [20,0]]])
var polyFC = featurecollection([poly1, poly2])
var pt1 = point(5,5, {population: 200})
var pt2 = point(1,3, {population: 600})
var ptFC = featurecollection([pt1, pt2])

var counted = count(polyFC, ptFC, 'pt_count')

console.log(counted)