Icon on map window toolbar, or Calculate menu. You must have a DEM map or a DEM associated with the image map.
Outline the region specified, either with stream or point mode digitizing.
This will creates an area shapefile in c:\mapdata\temp, which will be deleted when you close the program unless you save it, and a text display of the results.
You can also Create an area shapefile and
Last revision 3/4/2012