[GRASS-user] Can't dissolve based on column?

[Martin Landa]

Hi,

2008/1/16, Patton, Eric <epatton at nrcan.gc.ca>:
> Just a clarification...so it's the case that the column parameter in v.dissolve must always be of type integer, and *only* integer?

I don't see any reason why v.dissolve should support only integer
columns as a key used to dissolve areas...

(not tested v.dissolve)

Martin

> ~ Eric.
>
>
> -----Original Message-----
> From: grass-user-bounces at lists.osgeo.org on behalf of Nikos Alexandris
> Sent: Wed 1/16/2008 3:41 PM
> To: grass-user at lists.osgeo.org
> Subject: Re: [GRASS-user] Can't dissolve based on column?
>
> Well... I suspected it had to do with the field type of the column
> "CODE_00".
>
> Indeed... the column was "TEXT".
>
> After Daniels (Victoria) indications for a similar problem a change to
> "integer" (using sqlitebrowser) solved the problem.
>
> I suggest a clarification about that in the man page of v.dissolved.
>
> Greets...
>
> P.S. Thank you Daniel
> On Wed, 2008-01-16 at 16:52 +0100,
> nikos.alexandris at felis.uni-freiburg.de wrote:
> > All I try to do is a dissolve... and for:
> >
> > > v.dissolve input=clc00_clean output=clc00_dissolved
> > col=CODE_00
> >
> > I get:
> >
> > DBMI-SQLite driver error:
> > Cannot step:
> > SQL logic error or missing database
> >
> > ERROR: Cannot fetch data
> > ERROR: Unable to open vector map
> > <clc00_dissolved_19941 at nik> on topology
> >        level 2
> > ERROR: Vector map <clc00_dissolved> not found in current
> > mapset
> > _______________________________________________
> > grass-user mailing list
> > grass-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/grass-user
> --
> Nikos Alexandris
> .
> Department of Remote Sensing & Landscape Information Systems
> Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University Freiburg
> .
> Tel.  +49 (0) 761 203 3697 / Fax.  +49 (0) 761 203 3701 / Skype: Nikos.Alexandris
> .
> Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany
>
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>


-- 
Martin Landa <landa.martin at gmail.com> * http://gama.fsv.cvut.cz/~landa *