Extracting Data

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@mailer.uni-marburg.de

Hi,
check the ftp site "moon.cecer.army.mil", under the path
pub/grass/grass4.1/documents . I believe it is the document called
"mapcalc-algebra.ps.Z"

Regards,
--
Malcolm D. Williamson - GIS Specialist E-mail: malcolm@cast.uark.edu
Center for Advanced Spatial Technologies Telephone: (501) 575-6159
Ozark Rm. 12 Fax: (501) 575-5218
University of Arkansas
Fayetteville, AR 72701

On Thu, 13 Jun 1996 bepperli@Papin.HRZ.Uni-Marburg.DE
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@mailer.uni-marburg.de