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.
I saw this download has other functions in it, TPI (Topographic Position Index - algorithm increasingly used to measure topographic slope positions and to automate landform classifications), TWI (Topographic Wetness Index - also known as the Compound Topographic Index - CTI ), Elevation Void Fill, and two types of TRI. Be sure to use the 32 Bit Float as output for the TPI, otherwise the default is just 0 and 1 image. TWI: https://en.wikipedia.org/wiki/Topographic_wetness_index
https://www.arcgis.com/home/item.html?id=146df1f106614540a13b26ab4f997671
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