[GRASS-dev] Individual vector feature processing: v.clump?

[Pietro]

Hi Markus,

On Thu, Dec 4, 2014 at 8:34 AM, Markus Neteler <neteler at osgeo.org> wrote:
> On Wed, Dec 3, 2014 at 9:47 PM, Markus Metz
>> Adding unique categories to a new layer for the features in question
>> with v.category (take care of the type option) does not work in this
>> case?
>
> Likely it does (I am asking on behalf on another person not subscribed here).
> I wonder how to make it more obvious.  And, if there is a best
> practice example written in Python/PyGRASS?


with pygrass at the moment the pseudo code is something like:

{{{
with VectorTopo('yourvectormap', mode='r') as vect:
    for line in vect.viter('lines'):
        # do something with line
        pass
    for area in vect.viter('areas'):
        # do something with area
        pass
}}}

but I'm thinking to change how to iter between vector features to make
the distinction between topological and not topological features
clearer, something like:

{{{
with VectorTopo('yourvectormap', mode='r') as vect:
    for line in vect.features.lines:
        # do something with line
        pass
    for area in vect.topo.areas:  # nodes, centroid, etc.
        # do something with area
        pass
}}}

But I'm still thinking on it...

Best regards

Pietro