idris-ensure-clockwise

For when your geojson polygons cover the whole projection with a hole in the shape of your polygon. Happened to me using OSM data with D3.

JS implementation of Shoelace formula taken from kodkods answer to this question

No dependencies

Install

$ npm install idris-ensure-clockwise

Takes a GeoJSON collection, fixes the Polygons and MultiPolygons that are not clockwise and returns a new collection

var ensureClockwise = require('idris-ensure-clockwise')

ensureClockwise(GeoJSON_collection, function(fixed_GeoJSON_collection) {

})