geojson-derived-properties
Add derived properties--area, perimeter, length--to geojson features.
npm install geojson-derived-properties
Command Line Usage
npm install -g geojson-derived-properties cat foo.geojson | geojson-derived-properties -p area perimeter length > foo-with-geom-props.geojson
Javascript Usage
var addDerivedProps = var myGeoJson = /* your geojson object here */var withProps =