将 MultiPolygons 和 Polygons 列表转换为单个 MultiPolygon

Question

如何从 MultiPolygon 和 Polygon 对象列表中以通用方式创建 MultiPolygon？

a = MultiPolygon([Polygon([(0, 0), (1, 1), (1, 0)])])
b = Polygon([(0, 0), (2, 1), (1, 0)])

我希望执行产生以下对象的操作：

MultiPolygon([Polygon([(0, 0), (1, 1), (1, 0)]) , Polygon([(0, 0), (2, 1), (1, 0)])])

我不想创建联合，我只想迭代所有多边形。

Answer 1

Shapely 中没有可以根据多边形和 MultiPolygon 对象的列表创建多边形列表的功能。但是您可以为此目的编写一个简单的 generator function：

from shapely.geometry import MultiPolygon, Polygon

a = MultiPolygon([Polygon([(0, 0), (1, 1), (1, 0)])])
b = Polygon([(0, 0), (2, 1), (1, 0)])
your_list = [a, b]


def to_polygons(geometries):
    for geometry in geometries:
        if isinstance(geometry, Polygon):
            yield geometry
        else:
            yield from geometry


result = MultiPolygon(to_polygons(your_list))
print(result.wkt)
# MULTIPOLYGON (((0 0, 1 1, 1 0, 0 0)), ((0 0, 2 1, 1 0, 0 0)))

将 MultiPolygons 和 Polygons 列表转换为单个 MultiPolygon

Convert list of MultiPolygons and Polygons to a single MultiPolygon

python

shapely