turf-aggregate

turf-aggregate

Takes a set of polygons, a set of points, and an array of aggregations, then perform them. Sum, average, count, min, max, and deviation are supported.

###Install

npm install turf-aggregate

###Parameters

name	description
polygonFC	a FeatureCollection containing Polygons
pointFC	a FeatureCollection containing Points
aggregations	an array of aggregation objects (options in the example below)

###Usage

aggregate(polygonFC, pointFC, aggregations)

###Example

var aggregate = require('turf-aggregate')
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 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 aggregations = [
  {
    aggregation: 'sum',
    inField: 'population',
    outField: 'pop_sum'
  },
  {
    aggregation: 'average',
    inField: 'population',
    outField: 'pop_avg'
  },
  {
    aggregation: 'median',
    inField: 'population',
    outField: 'pop_median'
  },
  {
    aggregation: 'min',
    inField: 'population',
    outField: 'pop_min'
  },
  {
    aggregation: 'max',
    inField: 'population',
    outField: 'pop_max'
  },
  {
    aggregation: 'deviation',
    inField: 'population',
    outField: 'pop_deviation'
  },
  {
    aggregation: 'variance',
    inField: 'population',
    outField: 'pop_variance'
  },
  {
    aggregation: 'count',
    inField: '',
    outField: 'point_count'
  }
]

var polys = aggregate(polyFC, ptFC, aggregations)

console.log(polys)