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

[Patton, Eric]

Just a clarification...so it's the case that the column parameter in v.dissolve must always be of type integer, and *only* integer?

~ 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
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-- 
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