Calculate the area inside of any GeoJSON geometry. This is a port of Mapbox's geojson-area for Python.
$ pip install area
Simply pass a geojson string or python dictionary to the area function and get the area.
>>> from area import area
>>> obj = {'type':'Polygon','coordinates':[[[-180,-90],[-180,90],[180,90],[180,-90],[-180,-90]]]}
>>> area(obj)
511207893395811.06
$ python test.py
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It would be sweet if a user could pass objects which implement the __geo_interface__ protocol into the area method. This would allow calculating area of, for example, shapely geometries and would be a very minor code change.
I'm happy to write a PR if you think this would add value.
If passing in geojson that has an outer ring with a clockwise winding order, it return an area of 0. The revised geojson spec says that the outside ring should have a counterclockwise winding order. I'd think that it should either raise an exception (because the geojson is invalid) or return a negative area. Right now it seems to be returning 0, which is a bit counter-intuitive.
The asserts on lines 30 and 63, i.e.
assert isinstance(coordinates, list)
should also accept tuples, i.e.
assert isinstance(coordinates, (list,tuple))
Since tuples are a valid format on GeoJson and some libraries (e.g. shapely) map shapes to tuples instead of lists.
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