# 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.
将指定属性从点的FeatureCollection合并到多边形的FeatureCollection。给定点的inProperty和多边形的outProperty,它会找到每个多边形内的每个点,从这些点收集inProperty值,并将它们作为数组添加到多边形的outProperty中。

参数

参数 类型 描述
polygons FeatureCollection <Polygon> polygons with values on which to aggregate
points FeatureCollection <Point> points to be aggregated
inProperty string property to be nested from
outProperty string property to be nested into

返回

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

示例

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]
Last Updated: 1/19/2021, 10:59:20 AM