Turf.js pointsWithinPolygon 适用于 Polygon 但不适用于 FeatureCollection

Question

我正在尝试使用 Turf.js 在 FeatureCollection 的边界框中查找所有点。 根据文档，您可以为 function pointsWithinPolygon提供 Feature 或 FeatureCollection of Points。

使用文档中官方示例的修改版本，我收到以下错误消息：“Uncaught TypeError: Cannot read property '0' of undefined”。

    var locationA = turf.point([-75.343, 39.984], {
        name: 'Location A'
    });
    var locationB = turf.point([-75.833, 39.284], {
        name: 'Location B'
    });
    var locationC = turf.point([-75.534, 39.123], {
        name: 'Location C'
    });

    var collection = turf.featureCollection([
        locationA,
        locationB,
        locationC
    ]);

    var points = turf.points([
        [-80, 30],
        [-70, 30],
        [-70, 50],
        [-80, 50],
    ]);

    console.log(turf.pointsWithinPolygon(points, collection)); // Doesn't work

知道这里出了什么问题或可能导致问题的原因吗？ 该应用程序似乎适用于多边形，但不适用于特征集合。

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,-23.560],
    [-46.653,-23.543]
]]);

console.log(turf.pointsWithinPolygon(points, searchWithin)); // Works

Answer 1

为什么

console.log(turf.pointsWithinPolygon(points, collection)); // Doesn't work

根据文件在

https://turfjs.org/docs/#pointsWithinPolygon

pointsWithinPolygon(points, polygons)

参数：

points: Point(s)
polygons: (Multi)Polygon(s)

您的collection [必须是 (Multi)Polygon(s)] 不符合要求，它只是 3 个点的集合。