turf-average
Calculates the average value of a field for points within a set of polygons.
###Install
npm install turf-average
###Parameters
name | description |
---|
polygonFC | a FeatureCollection containing Polygons |
pointFC | a FeatureCollection containing Points |
inField | field from the point features to be averaged |
outField | field for the result on each polygon feature |
###Usage
averaged = average(polygonFC, pointFC, inField, outField)
###Example
var average = require('turf-average')
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 pt3 = point(14,2, {population: 100})
var pt4 = point(13,1, {population: 200})
var pt5 = point(19,7, {population: 300})
var ptFC = featurecollection([pt1, pt2, pt3, pt4, pt5])
var averaged = average(polyFC, ptFC, 'population', 'pop_avg')
console.log(averaged.features[0].properties.pop_avg)
console.log(averaged.features[1].properties.pop_avg)