[GRASS-user] Calculate raster statistics for each polygon

[katrin eggert]

I'm running GRASS6.4RC6 in Windows with a 2-week old Binary (we are only
using Windows here).
With that exact command I got:
C:/GRASS6/scripts/v.rast.stats: line 268: v.db.addcol:
command not found
ERROR: Cannot continue (problem adding columns).

Is this a common/expected problem in Windows? if yes, how can I perform this
analysis without using v.rast.stats?
Thanks
Kat

2010/8/6 Martin Wegmann <martin.wegmann at uni-wuerzburg.de>

> 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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