code: public Integer getZoomLevelMax(int zoomLevel) {
  		Integer zoomMax = zoomLevelMax.get(zoomLevel);
  		if (zoomMax == null) {
  			zoomMax = 0;
  		}
  		return zoomMax;
  	}
docs: Get the max at the zoom level
  
  @param zoomLevel
  zoom level
  @return max