union

Takes two or more polygons and returns a combined polygon. If the input polygons are not contiguous, this function returns a MultiPolygon feature.
获取两个或多个多边形，并返回一个组合多边形。如果输入的多边形不是连续的，这个函数将返回一个MultiPolygon。

参数

参数	类型	描述
A	...Feature <Polygon>	polygon to combine

返回

Feature <(Polygon|MultiPolygon)> - a combined Polygon or MultiPolygon feature

示例

var poly1 = turf.polygon([[
    [-82.574787, 35.594087], // 注意：polygon首尾坐标要一致
    [-82.574787, 35.615581],
    [-82.545261, 35.615581],
    [-82.545261, 35.594087],
    [-82.574787, 35.594087]
]], {"fill": "#0f0"});
var poly2 = turf.polygon([[
    [-82.560024, 35.585153], // 注意：polygon首尾坐标要一致
    [-82.560024, 35.602602],
    [-82.52964, 35.602602],
    [-82.52964, 35.585153],
    [-82.560024, 35.585153]
]], {"fill": "#00f"});

var union = turf.union(poly1, poly2);