[GRASS-dev] How to check if a vector map is multi-layer?

[Markus Neteler]

On Tue, Oct 28, 2014 at 4:25 PM, Markus Metz
<markus.metz.giswork at gmail.com> wrote:
> On Tue, Oct 28, 2014 at 3:49 PM, Markus Neteler <neteler at osgeo.org> wrote:
>> Hi,
>>
>> it would be nice to have in v.info or v.category the possibility to
>> check if a vector map comes with multiple layers.
>> I didn't figure out how to add that in these or one of these modules.
>> Perhaps I am missing something.
>
> Does
>
> v.category option=layers
>
> not help?

v.category k_buffer1000m option=layers
1

Right that works but at this point I have to rephrase my question :-)

We have the issue of overlapping polygons (v.buffer done on points)
which are a separate issue in itself, hence the resulting print report
for the categories is as such:

25/30/28/29/26/27/138/137/136/139/135/140
56/182
55/181/56/182
58/59/62/61/184/185/187/188/55/181/56/57/182/183
58/59/62/61/184/185/187/188/55/181/57/183
55/181/56/60/182/186

That's a set of categories g.gui.rlisetup cannot handle. In order to
avoid that it dies with ugly messages we want to catch such situations
and exit with a proper error message...

Markus