code: func RadialGeo(path *geo.Path, meters float64) *geo.Path {
  	p, _ := radialCore(path, meters, geoDistance, false)
  	return p
  }
docs: // RadialGeo peforms a radial distance polyline simplification using the GeoDistance.
  // ie. the path points must be lng/lat points otherwise the behavior of this function is undefined.
  // Returns a new path and DOES NOT modify the original.