如何在Shapely中检查多边形是否为空? [英] How to check if a polygon is empty in Shapely?

问题描述

我对Python来说还很陌生，所以这个问题的答案可能很简单，但是我四处寻找并尝试了很多，但找不到答案.

I'm pretty new to Python so the answer to this question is probably quite simple, but I've looked everywhere and tried a lot but couldn't find the answer.

使用Shapely简化多边形可能会导致一个空的多边形.如果多边形为空，我想用一个点替换多边形.像这样的东西:

Simplifying a polygon using Shapely may result in an empty polygon. I want to replace the polygon with a point if the polygon is empty. Something that would work like:

if mypoly is empty:
    mypoly = [(0,0)]

推荐答案

鉴于mypoly是形状多边形，您可以使用Shapely内置的is_empty检查其是否为空.

Given that mypoly is a shapely polygon, you can check if it's empty using is_empty which is built in to Shapely to check for empty ones.

from shapely.geometry import Point

if mypoly.is_empty:
    mypoly = Point(0, 0)

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