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Topographic inclination angle

Thu, 06/12/2003 - 4:08pm — vijay_ua
Hi! I am wondering if anyone used some GIS or other program to create topographic inclination angle based on DEM data. Calculating individually for each direction is very time consuming. I have 70 segments and for each segment, there is need to calculate 18 values. If some program can calculate all 18 values given the point that will be great. Vijay [addsig]
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Hydrodynamics
Tue, 07/01/2003 - 11:28am — Rob

Vijay, You can use DEMs to generate the topographic inclination angles. I use a combination of Fortran codes and a program called surfer to slice through a DEma nd get the information I need. The same could be done in GIS. I have used GIS to do some of the work but I have not developed any scripts or procedures for procssing in GIS. What I basically do is the following 1. Given a set of X,Y for each model segment centerpoint I create series of points along each 20 deg array around the segment centerpoint. The distance oaway can be varied. 2. The series of points is intersected with the DEM to acquire an elevation for each point 3. I then cull through the arrays and search for the highest inclination angle usign the distances and elevations from each model segmetn centerpoint. I hope this helps. Cheers, Rob[addsig]