enforce polygon ring winding order for geojson
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Latest commit 3e97419 Sep 21, 2017 @ingalls ingalls 0.3.0


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The GeoJSON specification is picky about winding order.

This helps you generate compliant Polygon and MultiPolygon geometries. Furthermore it lets you use Canvas and other drawing libraries's default behavior to color the interior rings of Polygon and MultiPolygon features.


as npm module:

npm install --save geojson-rewind

as console utility

# install
npm install -g geojson-rewind
# use
geojson-rewind foo.geojson

as browser library

copy geojson-rewind.js


rewind(geojson, clockwise)

Given a GeoJSON FeatureCollection, Feature, or Geometry, return a version with inner and outer rings of different winding orders.

If clockwise is true, the outer ring is clockwise, otherwise it is counterclockwise.