[GRASS-user] v.rast.stats over a large vector file

[razmjooeis at faunalia.co.uk]

Markus

No...same error
/usr/local/grass-6.5.svn/scripts/v.rast.stats2: 350: Syntax error: "("
unexpected



Cheers
Sab

> <razmjooeis at faunalia.co.uk> wrote:
>>
>> I managed to compile grass6.5 and the plugin.
>> Now when I try to run it, it comes up with this error:
>>
> So far so good...
>
>> /usr/local/grass-6.5.svn/scripts/v.rast.stats2: 350: Syntax
>> error: "(" unexpected
>>
> I can't reproduce this in the North Carolina sample dataset, mapset user1
> with
> g.copy vect=boundary_county at PERMANENT,myboundary_county
> v.rast.stats2 -c vector=myboundary_county at user1
> raster=elev_state_500m at PERMANENT colprefix=alt
>
> Can you?
>
> Markus M
>
>>
>>> On Fri, Nov 26, 2010 at 12:32 PM,  <razmjooeis at faunalia.co.uk> wrote:
>>>> Dear list
>>>>
>>>> I am trying to run v.rast.stats for a large vector file. It contains
>>>> around 700000 buildings representing buildings.
>>>>
>>>> here is my g.region info
>>>> g.region -p
>>>> projection: 99 (Transverse Mercator)
>>>> zone:       0
>>>> datum:      osgb36
>>>> ellipsoid:  airy
>>>> north:      183010.45829976
>>>> south:      153516.19024768
>>>> west:       513122.49174945
>>>> east:       555953.95182415
>>>> nsres:      4.99987592
>>>> ewres:      5.00017045
>>>> rows:       5899
>>>> cols:       8566
>>>> cells:      50530834
>>>>
>>>> THe problem I am having is the process is extremely slow. It has done
>>>> 150
>>>> features out of 700000 areas after 2 hours.
>>>> I need just the average raster value within each building (feature).
>>>> My questions are:
>>>> - Is there something I can do to speed up the process?
>>>> - Is there a way just to get the average value rather than the whole
>>>> set
>>>> of statistical parameters (I am not even using -e option)
>>>>
>>> You could try v.rast.stats2 from grass-addons, it should complete in
>>> less than 1 hour. When using v.rast.stats2 and grass 6.4, you also
>>> need r,univar.zonal from grass-addons (not needed for grass 6.5).
>>>
>>> Markus M
>>>
>>
>>
>>
>