goog.require('ol.Feature');
goog.require('ol.Map');
goog.require('ol.Sphere');
goog.require('ol.View');
goog.require('ol.geom.Polygon');
goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.source.TileWMS');
goog.require('ol.source.Vector');