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GeoJSON::Area

Crystal CI License

Calculate the area inside of any GeoJSON geometry.

Installation

  1. Add the dependency to your shard.yml:

    dependencies:
  geojson_area:
    github: geocrystal/geojson_area

  2. Run shards install

Usage

require "geojson_area"

This adds area method for all GeoJSON objects:

polygon = GeoJSON::Polygon.new([
  [[-10.0, -10.0], [10.0, -10.0], [10.0, 10.0], [-10.0,-10.0]],
  [[-1.0, -2.0], [3.0, -2.0], [3.0, 2.0], [-1.0,-2.0]]
])

polygon.area
# => 2366726096087.807

Also you can use GeoJSON::Area.area() directly. This method accept any GeoJSON object, and returns contained area as square meters.

polygon = GeoJSON::Polygon.new([
  [[-10.0, -10.0], [10.0, -10.0], [10.0, 10.0], [-10.0,-10.0]],
  [[-1.0, -2.0], [3.0, -2.0], [3.0, 2.0], [-1.0,-2.0]]
])

GeoJSON::Area.area(polygon)
# => 2366726096087.807

Contributing

  1. Fork it (https://github.com/geocrystal/geojson_area/fork)
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request

Contributors