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Shapely is an open source Python package for construction and analysis of 2D planar geometric objects common to geographic information systems.
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Calculating area in km² for Polygon in WKT using Python
It wasn't readily apparent to me how to use @sgillies answer, so here is a more verbose version:
import pyproj
import shapely
import shapely.ops as ops
from shapely.geometry.polygon import Polygon …