GeoJSON::Area

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

• Anton Maminov - creator and maintainer