goog.require('ol.Feature');
goog.require('ol.Map');
goog.require('ol.Overlay');
goog.require('ol.View2D');
goog.require('ol.geom.LineString');
goog.require('ol.geom.Point');
goog.require('ol.layer.Vector');
goog.require('ol.source.Vector');
goog.require('ol.style.Circle');
goog.require('ol.style.Fill');
goog.require('ol.style.Stroke');
goog.require('ol.style.Style');