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@turf/collect
Advanced tools
@turf/collect is a module from the Turf.js library that allows you to collect properties from one set of features (points) and aggregate them into another set of features (polygons). This is particularly useful for spatial analysis tasks where you need to summarize or aggregate data based on spatial relationships.
Collect properties from points into polygons
This feature allows you to collect properties from a set of point features and aggregate them into polygon features. In this example, the population property from the points is collected into the polygons.
const turf = require('@turf/turf');
const points = turf.featureCollection([
turf.point([0, 0], {population: 200}),
turf.point([2, 2], {population: 300}),
turf.point([2, 0], {population: 150})
]);
const polygons = turf.featureCollection([
turf.polygon([[
[0, 0], [2, 0], [2, 2], [0, 2], [0, 0]
]], {name: 'polygon1'})
]);
const collected = turf.collect(polygons, points, 'population', 'collectedPopulations');
console.log(JSON.stringify(collected, null, 2));
The geostats package provides a range of statistical functions for geospatial data, including classification and aggregation. While it does not directly offer the same point-to-polygon aggregation as @turf/collect, it can be used for similar statistical analysis tasks on geospatial data.
The jsts (JavaScript Topology Suite) package offers a wide range of spatial analysis and geometry operations. It includes functionalities for spatial relationships and operations, but it is more complex and lower-level compared to the specific point-to-polygon aggregation provided by @turf/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.
polygons
FeatureCollection<Polygon> polygons with values on which to aggregatepoints
FeatureCollection<Point> points to be aggregatedinProperty
string property to be nested fromoutProperty
string property to be nested intovar 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.
Install this single module individually:
$ npm install @turf/collect
Or install the all-encompassing @turf/turf module that includes all modules as functions:
$ npm install @turf/turf
FAQs
turf collect module
We found that @turf/collect demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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