[GRASS-user] v.distance warning (WARNING: more cats of to_layer)

[Martin Landa]

Hi,

it means that some of areas have multiple assigned categories, try to
open with v.digit and check categories of area centroids.

or print categories using v.category module, e.g.

v.category map type=centroid option=print layer=1

where layer is same as to_layer from your v.distance calling (probably 1)

you will find some multiple categories, e.g.

...
24
25
21/22/23/24/28
29
...

In this case v.distance use only cat '28' (last found).

Martin

2008/3/14, Corrado <ct529 at york.ac.uk>:
> Dear Martin,
>
>  does that mean that there are several areas (that is more than one) in the to
>  vector that satisfy the condition (for example: dmax=100) for each point in
>  the from vector?
>
>
>  On Wednesday 12 March 2008 15:23:46 Martin Landa wrote:
>  > Hi,
>  >
>  > in your case the vector map (given as 'to' in v.distance) contains
>  > some areas (bunch of boundaries and centroid inside). Category number
>  > of area is assigned to the centroid. Geometry feature (point, line,
>  > boundary, centroid, face or kernel) can have more categories in
>  > general. The message from v.distance warns you that there are more
>  > categories assigned to the area (i.e. centroid) in given layer
>  > (to_layer). The last found category in given layer is taken for
>  > computation, maybe v.distance should be fixed to handle also multiple
>  > categories in one layer(?)
>  >
>  > Martin
>  >
>  > 2008/3/12, Corrado <ct529 at york.ac.uk>:
>  > > Dear Martin,
>  > >
>  > >  I do not understand what you mean. Could you please explain?
>  > >
>  > >  On Wednesday 12 March 2008 14:09:46 you wrote:
>  > >  > Hi,
>  > >  >
>  > >  > it means that given vector feature from 'to' map (layer 'to_layers')
>  > >  > has more then one category. Maybe it would make sense to change
>  > >  > warning text to something less cryptic.
>  > >  >
>  > >  > Martin
>  > >  >
>  > >  > 2008/3/12, Corrado <ct529 at york.ac.uk>:
>  > >  > > Dear Martin,
>  > >  > >
>  > >  > >  I am using 6.2.3.
>  > >  > >
>  > >  > >  On Wednesday 12 March 2008 13:31:49 you wrote:
>  > >  > >  > Hi,
>  > >  > >  >
>  > >  > >  > 2008/3/12, Corrado <ct529 at york.ac.uk>:
>  > >  > >  > >  what does the warning:
>  > >  > >  > >
>  > >  > >  > >  WARNING: more cats of to layer
>  > >  > >  > >
>  > >  > >  > >  mean, when you execute the command v.distance?
>  > >  > >  >
>  > >  > >  > which GRASS version are you using? I cannot find such kind of
>  > >  > >  > message in grass_trunk.
>  > >  > >  >
>  > >  > >  > Martin
>  > >  > >
>  > >  > > Best Regards
>  > >  > >  --
>  > >  > >  Corrado Topi
>  > >  > >
>  > >  > >  Global Climate Change and Biodiversity
>  > >  > >  Area 18,Department of Biology
>  > >  > >  University of York, York, YO10 5YW, UK
>  > >  > >  Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk
>  > >
>  > >  Best Regards
>  > >  --
>  > >  Corrado Topi
>  > >
>  > >  Global Climate Change and Biodiversity
>  > >  Area 18,Department of Biology
>  > >  University of York, York, YO10 5YW, UK
>  > >  Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk
>
>  Best Regards
>  --
>  Corrado Topi
>
>  Global Climate Change and Biodiversity
>  Area 18,Department of Biology
>  University of York, York, YO10 5YW, UK
>  Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk
>


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