Land surface forms for the conterminous United States were also generated as part of the ecosystems modeling effort (Cress and others, 2009b). After extensive investigation into various land surface form methodologies, the decision was made to use the methodology developed by the Missouri Resource Assessment Partnership (MoRAP). MoRAP made modifications to Hammond's (1964a, 1964b) land surface form classification, which allowed the use of 30-meter source data and a 1-km2 window for analyzing the data cell and its surrounding cells (neighborhood analysis) (True, 2002; True and others, 2000). While Hammond's methodology was based on three topographic variables, slope, local relief, and profile type, MoRAP's methodology uses only slope [...]
