geoJson

fun FeatureGroup<Gmc>.geoJson(geoJson: GeoJson, id: String? = null): FeatureRef<Gmc, Feature<Gmc>>
fun FeatureGroup<Gmc>.geoJson(geoJsonUrl: URL, id: String? = null): FeatureRef<Gmc, Feature<Gmc>>

Add geojson features from url