Instructions
Draw a polygon in Google Earth and save the KML file. Open the file and mark the polygon with "Airport_Backgrounds_Flatten_MaskClassMap_ExcludeAutoGen." This will initiate a project that involves the flattening of terrain around an airport.
Click the "Vertices" tab and then click the "Edit" button to set the elevation of the polygon to the elevation of the runway.
Click the "Set Elevation" button and input the elevation of the runway. The area around the runway will now be flattened.