Extracting Data

[Schmidt]

At 03:01 PM 6/13/96 LOCAL, you wrote:
>Hello everyone,
>I have to do some work on a 7.5 minutes DEM. Does anyone know how to extract 
>or calculate ridges, valleys, drainage divide, drainage channels, slope 
>curvature and slope shape ? And where can I get the book "r.mapcalc: An 
>algebra for GIS and Image Processing" by M. Shapiro and J. Westervelt? 
>
>
>Thank you in advance.
>
>J. Bepperling
>bepperli at mailer.uni-marburg.de
>
>

r.watershed will calculate drainages divides and drainage channels.

Jim Schmidt
avenues at sonnet.com