Calculate the area inside of any GeoJSON geometry. This is a port of Mapbox's geojson-area for Python

Related tags

Geolocationarea
Overview

geojson-area

https://travis-ci.org/scisco/area.svg?branch=master

Calculate the area inside of any GeoJSON geometry. This is a port of Mapbox's geojson-area for Python.

Installation

$ pip install area

Usage

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

Test

$ python test.py

Credit

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Comments
  • support __geo_interface__

    support __geo_interface__

    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.

    opened by geospatial-jeff 0
  • Area is 0 if wrong winding order

    Area is 0 if wrong winding order

    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.

    opened by JoelBennett 1
  • Coordinates should accept list or tuple

    Coordinates should accept list or tuple

    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.

    opened by Taxuspt 1
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