/brute-force-equal-area

Generate a grid of equal area polygons

Primary LanguageJavaScript

Brute Force Equal Area

Generates grids with equal area polygons

Install

npm install https://github.com/UW-Macrostrat/brute-force-equal-area.git

API

latitude(longitudeSpacing, latitudeSpacing, callback)

  • longitudeSpacing - divide bands of latitude by x degrees of longitude
  • latitudeSpacing - the number of times a hemisphere should be cut
  • callback - a function with a single parameter which is a GeoJSON FeatureCollection with the result

longitude(latitudeSpacing, cellArea, callback)

Given a latitude spacing and a target cell area, create an equal area grid.

  • latitudeSpacing - distance in degrees between bands of latitude. For example, latitudeSpacing = 5 would produce lines of latitude at 0, 5, 10, 15, 20...etc degrees.
  • cellArea - the target cell area in km^2. The actual result will vary depending on the band of latitude
  • callback - a function with a single parameter which is a GeoJSON FeatureCollection with the result

Example usage

var bfea = require('brute-force-equal-area');

bfea.latitude(5, 12, function(latGrid) {
  fs.writeFileSync(__dirname + '/latitude_grid.geojson', JSON.stringify(latGrid));
});

bfea.longitude(5, 500000, function(lngGrid) {
  fs.writeFileSync(__dirname + '/longitude_grid.geojson', JSON.stringify(lngGrid));
});

Authors

Andrew Zaffos, John Czaplewski