[GRASS-user] problem with g.in.ogr

[Markus Metz]

On Thu, Apr 12, 2018 at 6:20 PM, Moritz Lennert <
mlennert at club.worldonline.be> wrote:
>
> On 12/04/18 17:03, Camille Bezzina wrote:
>>
>> Hi Markus,
>>
>> In the file attached you can find the full output of v.import with
verbose.
>>
>> I launch this one with v.in.ogr and this is the answer.
>
>
> At the end you can see:
>
> "Some input polygons are overlapping each other.
> If overlapping is not desired, the data need to be cleaned.
> The input could be cleaned by snapping vertices to each other.
> Estimated range of snapping threshold: [1e-08, 1]
> Try to import again, snapping with at least 1e-08: 'snap=1e-08'"
>
> Try importing with snap=0.01 or something like that (depending on the
nature and precision of your data.

I would rather suggest snapping with a smaller value: snap=1e-4.

The main problem is close to the end, when building topology for the final
output bati_D90_decoupe:
WARNING: Nombre de contours incorrects: 8772

This is the reason for disappearing polygons. This is a bug that has been
fixed a while ago, please update your GRASS version to the latest 7.2 or
7.4 release.

Markus M

>
> Moritz
>
>>
>> Thanks.
>>
>>
>>
>> Le 12/04/2018 à 16:39, Markus Metz a écrit :
>>>
>>>
>>>
>>> On Thu, Apr 12, 2018 at 3:04 PM, Camille Bezzina <
camille.bezzina at geophom.fr <mailto:camille.bezzina at geophom.fr>> wrote:
>>> >
>>> > Hello all,
>>> >
>>> > I have a problem with v.in.ogr.
>>> > I would like to import a shape file (with 57851 polygons) with
v.in.ogr.
>>> >
>>> > v.import --verbose
input=/media/hdd1/phom/eolien/AIP_UNESCO_RONCHAMP/data/qgis/MNE/bati_D90_decoupe.shp
layer=bati_D90_decoupe output=bati_D90_decoupe -o
>>> >
>>> > Visibly the order is going well, my attribute table contains 57851
attributes but when I check my vector with display, some polygons are
missing.
>>>
>>> Can you post the full output of v.import with --verbose?
>>>
>>> Considering that you override the projection check with -o, you can
also use v.in.ogr directly and then post the full output of v.in.ogr -o
--verbose.
>>>
>>> Markus M
>>>
>>> >
>>> > Thanks for your help.
>>> >
>>> > --
>>> > Camille Bezzina
>>> > Geophom
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>>> > https://lists.osgeo.org/mailman/listinfo/grass-user
>>>
>>
>> --
>> Camille BEZZINA
>> Chargé d'études géomatiques et photomontages
>> Geophom
>> 57 rue du Chemin Neuf 44521 OUDON
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>>
>>
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>>
>
>
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