joins

pointsWithinPolygon

npm install @turf/points-within-polygon

接收一个面要素和点要素(集合)，计算并返回在该面要素内部的点

参数

入参	类型	描述
points	Feature|FeatureCollection<Point>	要计算的点要素
polygons	FeatureCollection|Geometry|Feature<Polygon|MultiPolygon>	面要素

返回

FeatureCollection<Point>

范例

var points = turf.points([
  [-46.6318, -23.5523],
  [-46.6246, -23.5325],
  [-46.6062, -23.5513],
  [-46.663, -23.554],
  [-46.643, -23.557]
]);

var searchWithin = turf.polygon([
  [
    [-46.653, -23.543],
    [-46.634, -23.5346],
    [-46.613, -23.543],
    [-46.614, -23.559],
    [-46.631, -23.567],
    [-46.653, -23.56],
    [-46.653, -23.543]
  ]
]);

var ptsWithin = turf.pointsWithinPolygon(points, searchWithin); // [-46.6318, -23.5523]、[-46.643, -23.557]

tag

npm install @turf/tag

接收一组点要素集合和一组面要素集合，面要素内的点要素进行空间连接和属性继承

参数

入参	类型	描述
points	FeatureCollection<Point>	点要素集合
polygons	FeatureCollection<Polygon>	面要素集合
field	String	面要素的要被继承的属性
outField	String	点要素继承属性的重命名

返回

FeatureCollection<Point>

范例

var pt1 = turf.point([-77, 44]);
var pt2 = turf.point([-77, 38]);
var poly1 = turf.polygon(
  [
    [
      [-81, 41],
      [-81, 47],
      [-72, 47],
      [-72, 41],
      [-81, 41]
    ]
  ],
  { pop: 3000 }
);
var poly2 = turf.polygon(
  [
    [
      [-81, 35],
      [-81, 41],
      [-72, 41],
      [-72, 35],
      [-81, 35]
    ]
  ],
  { pop: 1000 }
);

var points = turf.featureCollection([pt1, pt2]);
var polygons = turf.featureCollection([poly1, poly2]);

var tagged = turf.tag(points, polygons, "pop", "population");
/*
{
  type: "FeatureCollection",
  faetures: [
    {
      type: "Feature",
      geometry: {
        type: "Point",
        coordinates: [-77, 44]
      },
      properties: {
        population: 3000 // pop属性重命名为population
      }
    },
    {
      type: "Feature",
      geometry: {
        type: "Point",
        coordinates: [-77, 38]
      },
      properties: {
        population: 1000
      }
    }
  ]
}
*/