[GRASS-user] Calculate raster statistics for each polygon

[razmjooeis at faunalia.co.uk]

It might be something to do with
v.db.addcol in windows:
http://osgeo-org.1803224.n2.nabble.com/GRASS-GIS-1110-v-rast-stats-locks-up-on-wingrass-td5311955.html

cheers
Sab
> Hello,
>
> which GRASS version are you using and on which plattform?
>
> I did it with GRASS 6.4.0RC6 on Linux using the example GRASS dataset and
> it
> worked without problems:
>
> v.rast.stats -e vector=geology at PERMANENT layer=1
> raster=elevation at PERMANENT
> colprefix=new_ percentile=90
>
> and the new attribute table when querying the vector file looks like this:
> cat : 270
> onemap_pro : 333074592
> PERIMETER : 191354.515625
> GEOL250_ : 271
> GEOL250_ID : 270
> GEO_NAME : CZig
> SHAPE_area : 333074608.99
> SHAPE_len : 191354.519722
> new__n : 24
> new__min : 106.708168
> new__max : 108.974335
> new__range : 2.266167
> new__mean : 107.466569
> new__stdde : 0.653831
> new__varia : 0.427495
> new__cf_va : 0.608404
> new__sum : 2579.197662
> new__first : 106.772
> new__media : 107.506
> new__third : 107.803
> new__per90 : 108.416
>
> regards, Martin
>
>
> On Freitag, 6. August 2010 10:22:10 katrin eggert wrote:
>> Hi
>> Thanks Martin but It's not working. With the following command
>> v.rast.stats -c -e --verbose vector=seg1 at PERMANENT
>> raster=SEG.1 at PERMANENTcolprefix=stat
>>
>> I'm getting this error:
>> Adding columns ' stat_n INTEGER, stat_min DOUBLE PRECISION, stat_max
>> DOUBLE
>> PRECISION, stat_range DOUBLE PRECISION, stat_mean DOUBLE PRECISION,
>> stat_stdde DOUBLE PRECISION, stat_varia DOUBLE PRECISION, stat_cf_va
>> DOUBLE
>> PRECISION, stat_sum DOUBLE PRECISION, stat_first DOUBLE PRECISION,
>> stat_media DOUBLE PRECISION, stat_third DOUBLE PRECISION, stat_per90
>> DOUBLE
>> PRECISION'
>> C:/GRASS6/scripts/v.rast.stats: line 268: v.db.addcol:
>> command not found
>> ERROR: Cannot continue (problem adding columns).
>>
>> Why am I getting this? Or, what I have to do before I run v.rast.stat?
>> Thanks
>> Kat
>>
>>
>>
>> 2010/8/5 Martin Wegmann <martin.wegmann at uni-wuerzburg.de>
>>
>> > Hello,
>> >
>> > I think v.rast.stats is what you are looking for
>> >
>> > http://grass.itc.it/gdp/html_grass64/v.rast.stats.html
>> >
>> > regards, Martin
>> >
>> > On Donnerstag, 5. August 2010 18:25:37 katrin eggert wrote:
>> > > Hello
>> > >
>> > > I have polygon layer which divides my image into several areas all
>> > > contiguous. With the same size, I have a raster image. I want to:
>> > >
>> > > - calculate the most frequent value of the raster inside each
>> polygon;
>> > >
>> > > - the maximum and minimum value inside each polygon
>> > >
>> > > How can this be done in GRASS?
>> > >
>> > >
>> > > Thanks
>> > >
>> > > Katrin
>
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