[GRASS-user] Movement Cost: Euclidean results?

GRASS GRASS user
1

Dear GRASS-users,

I want to obtain a movement cost layer (r.walk) which only regards pure walking cost (without a friction layer). I've generated a 32 bit geotiff DEM (not too big) and a constant value = 1 grid as friction surface (for being neutral). Unfortunately GRASS only gives me a symmetrical result as there would be no relief.
Is is not possible to perform a simple movement-cost analysis without any optional friction maps? Using a constant value grid (or lamda = 0) doesn't work unfortunately. I'm always getting symmetrical/euclidean results.

Thank you!

Regards
David

2

Hello,

i posted that question already some time ago but didn't get any
reply/idea...

Here again:

I am looking for the literature reference for Boyle's algorithm in v.generalize. What is the source this tool is based on. Does anyone know
the original literature?

Thank you

/Johannes
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3

On Wed, Jun 8, 2011 at 2:30 PM, Johannes Radinger <JRadinger@gmx.at> wrote:

Hello,

i posted that question already some time ago but didn't get any
reply/idea...

Here again:

I am looking for the literature reference for Boyle's algorithm in v.generalize. What is the source this tool is based on. Does anyone know
the original literature?

No answer usually means no. I had a look at the source code, but there
is no reference (neither in the manual). Maybe Daniel Bundala, the
author of the module, knows a reference for Boyle's algorithm. This
module was a Google Summer of Code project; maybe you find something
if you read through the corresponding threads.

Markus M