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Asked: 2026-05-20T09:24:58+00:00

I have an array of latitude/longitude coordinate pairs that represent a polygon. I’m trying

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I have an array of latitude/longitude coordinate pairs that represent a polygon. I’m trying to determine the total area within that polygon. How would I go about doing that in Ruby?

Here’s an example array of the polygon:

[[37.7663613767094, -122.452969210084], [37.7674219449606, -122.444718340349], [37.7701838510542, -122.445330289514], [37.7709974013834, -122.439159589248], [37.7700761930893, -122.438861402472], [37.7703501163684, -122.436868738421], [37.7712650571321, -122.437078116573], [37.7736056746515, -122.437533130227], [37.7714671036087, -122.453964210266], [37.7663613767094, -122.452969210084]]
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1 Answer

  1. Editorial Team

    You can use this library which wraps GEOS (a C geospatial library itself a port of the JTS).
    https://github.com/dark-panda/ffi-geos

    This library can handle the calculations in coordinate space and takes care of the approximations.

    Depending on how much accuracy you need I would project the data first to an appropriate projection (not Mercator). Then calculate your area

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