Hello Hamish.
There are several anisotropic functions. Each one produces different
results. For the accumulated cost surfaces I most generate Tobler’s Hiking
Function will produce more accurate results.
Thank you anyway.
----- Original Message -----
From: "Hamish" <hamish_nospam@yahoo.com>
To: <mlage@usal.es>
Cc: <grassuser@grass.itc.it>
Sent: Thursday, January 25, 2007 11:12 PM
Subject: Re: [GRASS-user] Tobler's hiking function
I am trying to express Tobler's Hiking Function with r.mapcalc.
see also "r.walk":
"Outputs a raster map layer showing the anisotropic cumulative cost of
moving between different geographic locations on an input elevation
raster map layer whose cell category values represent elevation combined
with an input raster map layer whose cell values represent friction
cost."Hamish