[GRASS-dev] Re: raster modules still using sites library

[Michael Barton]

I figured out what the 'problem' is with r.walk.

If you use a null map for the friction map (because a friction map is  
required even if you don't want to use it), it creates raster support  
files but no map (i.e., no cell/fcell map).

This is a minor bug as it should either give an error or create  
something (null map, ignore the friction map, but something). But it  
is an easy workaround and is not critical. Still, people should be  
aware of this.

Michael
______________________________
C. Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University
Tempe, AZ  85287-2402
USA

voice: 480-965-6262; fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

On Nov 18, 2008, at 12:31 PM, Michael Barton wrote:

> Thanks Colin,
>
> I'll need to try more to see what is going on.
>
> Michael
> ______________________________
> C. Michael Barton, Professor of Anthropology
> Director of Graduate Studies
> School of Human Evolution & Social Change
> Center for Social Dynamics & Complexity
> Arizona State University
> Tempe, AZ  85287-2402
> USA
>
> voice: 480-965-6262; fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
>
> On Nov 18, 2008, at 12:26 PM, Colin Nielsen wrote:
>
>> I'm not sure what version you are using but those modules run fine  
>> for
>> me using a vector file, with multiple points (I've been using v6.3
>> compiled in windows with msys/mingw). They just put up a warning
>> message about the sites library being deprecated. Honestly, I
>> attempted but failed to update r.walk to the vector library. My
>> programming skills are not quite up to par, yet.
>>
>> -Colin
>>
>> On Tue, Nov 18, 2008 at 2:17 PM, Michael Barton <michael.barton at asu.edu 
>> > wrote:
>>> For several years now, r.cost, r.drain, and now r.walk have  
>>> continued to use
>>> the adapted sites library instead of the vector library. This  
>>> means that
>>> they all fail if you enter vector points as starting points. It  
>>> sure would
>>> be nice if this feature actually worked on these so that you could  
>>> 1) use a
>>> vector map for start points rather than having to manually enter  
>>> coordinates
>>> and 2) use multiple starting points.
>>>
>>> Michael
>>> ______________________________
>>> C. Michael Barton, Professor of Anthropology
>>> Director of Graduate Studies
>>> School of Human Evolution & Social Change
>>> Center for Social Dynamics & Complexity
>>> Arizona State University
>>> Tempe, AZ  85287-2402
>>> USA
>>>
>>> voice: 480-965-6262; fax: 480-965-7671
>>> www: http://www.public.asu.edu/~cmbarton
>>>
>>>
>