union

使用union函数可以将两个或多个GeoJSON几何体组合成一个单一的Geometry对象。

参数

• feature1：(GeoJSON Feature) 第一个要组合的要素。
• feature2：(GeoJSON Feature) 另一个要组合的要素。

返回值

返回一个新的GeoJSON Feature对象，其中包含组合了两个或多个输入Geometry的Geometry对象。

示例

var turf = require('@turf/turf');

var feature1 = turf.polygon([[
    [-122.801742, 45.48565],
    [-122.801742, 45.60491],
    [-122.584762, 45.60491],
    [-122.584762, 45.48565],
    [-122.801742, 45.48565]
]], {
  "fill": "#00f"
});

var feature2 = turf.polygon([[
    [-122.520217, 45.535693],
    [-122.64038, 45.553967],
    [-122.720031, 45.526554],
    [-122.669906, 45.507309],
    [-122.723464, 45.446643],
    [-122.532577, 45.408574],
    [-122.487258, 45.477466],
    [-122.520217, 45.535693]
]], {
  "fill": "#f00"
});

var output = turf.union(feature1, feature2);

输出结果为：

{
    "type": "Feature",
    "geometry": {
        "type": "MultiPolygon",
        "coordinates": [
            [
                [
                    [-122.801742, 45.48565],
                    [-122.801742, 45.60491],
                    [-122.584762, 45.60491],
                    [-122.584762, 45.48565],
                    [-122.801742, 45.48565]
                ]
            ],
            [
                [
                    [-122.520217, 45.535693],
                    [-122.64038, 45.553967],
                    [-122.720031, 45.526554],
                    [-122.669906, 45.507309],
                    [-122.723464, 45.446643],
                    [-122.532577, 45.408574],
                    [-122.487258, 45.477466],
                    [-122.520217, 45.535693]
                ]
            ]
        ]
    },
    "properties": {
        "fill": "#00f"
    }
}

参考

• Turf-union