[Qgis-user] error with r.cost

[ambijat]

Hi! Markus,
I am using a mask so as to limit my operation. The only improvisation I 
did was this time to run the set on Fedora14 as I have my dual boot 
machine. Luckily I have now my r.cost raster built. But, before going 
for that I reduced the SRTM altitude values to range between 0-255. So, 
some economizing on bit size was possible.

But,

But, now I am stuck with a new thing and this is with r.walk. I am still 
performing this operation on F14. But, there is a crash everytime. The 
input rasters are the two one the same rescaled raster for base values 
and r.cost generated raster for friction values. But, it is crashing 
every time. I am not getting a headway. I need to generate a route 
between two cities cross the Hindukush mountain ranges in Afghanistan.

Any, ideas to this issue. I am thinking of using r.slop.aspect raster 
for friction values what do you suggest.

Thanks and regards,
Ambrish Dhaka


On 4/11/2011 1:37 AM, Markus Neteler wrote:
> Ambrish Dhaka,
>
> you need to check the region extent + resolution, probably
> you are exceeding the available RAM if you are having too
> many rows and columns.
>
> Get the information with:
> g.region -p
>
> or the respective menu entry.
>
> Markus
>
> On Sun, Apr 10, 2011 at 10:57 AM, ambijat<ambijat at hotmail.com>  wrote:
>> Ramon says,
>> I'm afraid I don't - but given the current situations, I'd suggest anyone
>> that could help would also be wondering which version of QGIS you were using
>> and on which operating system.
>>
>> The Qgis version is 1.6.0 also, the result is same on GRASS (tcl/tk) 6.4
>> RC1, performed on WinXP SP3 on a core2Duo machine.
>>
>> regards,
>> Ambrish Dhaka
>
> On 10/04/2011, at 13:19 , ambijat wrote:
>> Hi All,
>> I am trying to create shortest path between two raster points (converted from v.to.rast) and I use the STRM data for the input values between the two points. This is the error I get.
>>
>> r.cost input=afg_rast at user1 output=salroute start_rast=salang at user1 max_cost=0 -k
>> G_malloc: unable to allocate 524288 bytes at setup.c:64
>> Finished with error
>>
>> Any idea why I am getting this?
>> Thanks and regards,
>> Ambrish Dhaka
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