[GRASS-user] v.edit tool=merge

[Markus Metz]

On Fri, Sep 23, 2016 at 5:44 PM, Vincent Bain <bain at toraval.fr> wrote:
> Thanks Markus,
> indeed it works much much faster !
>
> However on my data I notice the result is slightly different from the
> one I get with  6.4, i.e. some segments don't snap to each other : where
> I should have a result with 199 lines I have 217 objects. If I try to
> snap them manually via wx digitizer, it fails too.
> Later I noticed that when applying twice the command, the result is
> finally correct (199 lines).

Weird. I will try to look into it, but this is will take some time.
For the current fix, I needed to go through 600 MB of debug messages.
The difference between G7 and G6 is a mystery to me, and I don't
understand (yet) why it works with G6 at all. I guess it is a
difference somewhere in the main vector library, problem is that the
G6 and G7 vector libraries are very different.

At least you got a working solution.

Markus M

>
> Vincent.
>
> Le vendredi 23 septembre 2016 à 15:00 +0200, Markus Metz a écrit :
>> On Tue, Sep 20, 2016 at 3:06 PM, Vincent Bain <bain at toraval.fr> wrote:
>> > Hi,
>> > on a fresh (r69498) trunk version of grass, I have a problem running a
>> > v.edit command on a map.
>> > Given a vector map composed of 200 contour lines splitted in roughly
>> > 17000 line segments (adjacent nodes perfectly overlapping), I need to
>> > "unsplit" these contours. If I try to run the following command :
>> >
>> >         v.edit map=contours type=line tool=merge snap=vertex -r cats=0
>> >
>> > it looks line it never ends, i.e. the process does not return any error,
>> > RAM and CPU usages appear stable (not huge). After tens of minutes it
>> > still hangs up. I finally have to interrupt, then chucking out the
>> > topology-damaged map.
>>
>> v.edit tool=merge hangs for zero-length lines. Such contours can occur
>> on peaks and in pits. Fixed in all G7 branches with r69556-8.
>>
>> Markus M
>>
>> >
>> > Running the same command on grass6.4 (after v.build the source map), it
>> > runs successfully within some minutes.
>> >
>> > Before I open a ticket, would anyone wish to give a try to my data ?
>> >
>> > Vincent.
>> >
>> > _______________________________________________
>> > grass-user mailing list
>> > grass-user at lists.osgeo.org
>> > http://lists.osgeo.org/mailman/listinfo/grass-user
>
>