ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. 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.