Calculate TOPEX

Discussion created by reedhska on Oct 1, 2012
Latest reply on Feb 20, 2014 by reedhska
Hey All, 

I was looking for some advice on how to calculate topographic exposure (TOPEX) in ArcGIS.  Jamie Popkin posted a tutorial on how to perform the calculations using GRASS (  I am looking to calculated Distance Limited TOPEX for eight directions (10,60,90,140,190,240,270,320) with ArcGIS.  Any clues? 
Additionally, there is a script for ArcView3.2 available from  I tried contacting Dr. Mitchell himself, but no response yet.  Any advice besides just doing it in grass is greatly appreciated! 

Best Regards,