We begin with a grey-scale, shadded releif map drapped over a 3-Dimensional representation of the area. Both are based on a 30 second digital elevation model. The Bangtail Hills are in the foreground, this is the southeast corner.
This map shows the Bridger Mountain area in Montana with a red rectangle. The area is between UTM zone 12 eastings 489500 and 524000 and between northings 5060000 and 510600, that is 34.5 by 46 km. The total area is 1,587,000 hectares. This map used the 1 km Digital Elevation Model (DEM) data from the conterminous U.S. Advanced Very High Resolution Radiometry (AVHRR) project ($35 per CD) and the 1:2,000,000 Digital Line Graph (DLG) data for the U.S. (free on the World Wide Web (WWW)). The green line is the continental divide. The AVHRR image was resampled to a projection more suitable for our area and to control image size. The code from the U.S.G.S. General Cartographic Transformation Package was used for the map projection. The image was simultaneously rescaled for better contrast and subset to our area. It could have been further processed for smoothness or edge enhancement. The DLG data were similarly projected and subset to the same area and overlaid on the processed AVHRR project image.