[GRASS-user] negative slope values and movement costs

Gerald Nelson gnelson at uiuc.edu
Thu Feb 1 02:49:17 EST 2007

Multiply all cell values by -1? Add a negative number to all cell values? Use r.cost?

Depends on what you want.


---- Original message ----
>Date: Thu, 1 Feb 2007 08:25:03 +0100 (CET)
>From: mlage at usal.es  
>Subject: [GRASS-user] negative slope values and movement costs  
>To: grassuser at grass.itc.it
>In the slope maps computed through r.slope.aspect, all slope values are
>always positive? Is there any way to transform positive slope values into
>negative values, to estimate movement costs in a slope map?
>Thank you.
>Miguel Lage.
>grassuser mailing list
>grassuser at grass.itc.it
Gerald Nelson
Professor, Dept. of Agricultural and Consumer Economics
University of Illinois, Urbana-Champaign
office: 217-333-6465 
cell: 217-390-7888
315 Mumford Hall
1301 W. Gregory
Urbana, IL 61801

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