Aspect
Aspect identifies the downslope direction of the maximum rate of change in value from each raster DEM cell to its neighbors.
http://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analyst-toolbox/how-aspect-works.htm
Added to support Critical Zone Observatory (CZO) data use cases.
ODM2 Variable Name Controlled Vocabulary
ODM2 Working Group
A vocabulary for describing the name of Variables.