https://github.com/geocrystal/ring_area

Calculate the approximate area of the polygon were it projected onto the earth.
https://github.com/geocrystal/ring_area

crystal geospatial

Last synced: about 2 months ago
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Calculate the approximate area of the polygon were it projected onto the earth.

• Host: GitHub
• URL: https://github.com/geocrystal/ring_area
• Owner: geocrystal
• License: mit
• Created: 2024-04-11T11:10:03.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2024-12-03T09:00:29.000Z (over 1 year ago)
• Last Synced: 2025-03-30T18:46:33.136Z (12 months ago)
• Topics: crystal, geospatial
• Language: Crystal
• Homepage:
• Size: 21.5 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# ring_area

[![Crystal CI](https://github.com/geocrystal/ring_area/actions/workflows/crystal.yml/badge.svg)](https://github.com/geocrystal/ring_area/actions/workflows/crystal.yml)

[![GitHub release](https://img.shields.io/github/release/geocrystal/ring_area.svg)](https://github.com/geocrystal/ring_area/releases)

[![License](https://img.shields.io/github/license/geocrystal/ring_area.svg)](https://github.com/geocrystal/ring_area/blob/main/LICENSE)

Calculate the approximate area of the polygon were it projected onto the earth.

## Installation

1. Add the dependency to your `shard.yml`:

   ```yaml

   dependencies:

     ring_area:

       github: geocrystal/ring_area

   ```

2. Run `shards install`

## Usage

```crystal

require "ring_area"

coordinates = [

  [125, -15],

  [113, -22],

  [117, -37],

  [130, -33],

  [148, -39],

  [154, -27],

  [144, -15],

  [125, -15],

]

RingArea.ring_area(coordinates).to_meters

# => 7748891609977.456

```

Accepts an `Array(Array(Number))` of Ring Coordinates as `[[longitude1, latitude1], [longitude2, latitude2], ...]`.

Returns a `RingArea::Area` object which can provide output in kilometers, meters, miles, feet, etc.

## Contributing

1. Fork it ()

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](https://github.com/mamantoha) - creator and maintainer