I'd like and easy way to classify the landscape into both slope position (i.e. ridge top, valley bottom, mid-slope, etc.) and landform category (i.e. steep narrow canyons, gentle valleys, plains, open slopes, mesas, etc.). There is an ArcView 3 script that helps me do this, but I'd prefer to stay in ArcGIS. The script is here: http://arcscripts.esri.com/details.asp?dbid=14156
This extension calculates Topographic Position Index (TPI) grids from elevation grids, and provides a simple and repeatable method to classify the landscape into slope position and landform category using the TPI values. This extension also provides additional functions to standardize and classify grids, and to generate grid and neighborhood statistics.