not needed.

src/main/resources/eu/simstadt/regionchooser/website/script/simstadt_openlayers.js

@@ -148,7 +148,6 @@ const regionChooser = (function(){
 		var intersectionArea = intersection.getGeometry().getArea();
 		var citygml_percentage = Math.round(intersectionArea / feature["area"] * 100);
 		var sketch_percentage = Math.round(intersectionArea / polygonArea * 100);
-		var id = feature.getId();
 		intersections.addFeature(intersection);
 		
 		//TODO: Clean this mess. No jquery