[GRASS-dev] Import PostGIS vector layer into SQLite database

[Luí­s Moreira de Sousa]

Hi Markus,

I am working with GRASS 7.6 installed from the ubuntugis PPA.

Cheers.

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-------- Original Message --------
On Mar 27, 2019, 21:10, Markus Metz wrote:

> On Wed, Mar 27, 2019 at 5:42 PM Luí­s Moreira de Sousa <luis.de.sousa at protonmail.ch> wrote:
>>
>> Hi all,
>>
>> I am working with vector layers (points) composed of more than 100 000 geometries. These layers are originally in a PostGis database and I import them with v.in.ogr, using a formulation like:
>>
>> v.in.ogr \
>>     input="PG:host=127.0.0.1 dbname=gisdb user=user password=secret" \
>>     layer=schema.points \
>>     output=points \
>>     -o --overwrite
>>
>> This command is successful, however, operations with the resulting points layer are remarkably slow. For instance, this layer must be later loaded in R and that operation alone is taking over 3 hours.
>>
>> After some back-and-forth testing, I identified the problem: v.in.ogr is not saving its output in the internal GRASS SQLite database. Knowing this, I can create a copy of the original output, that is automatically inserted into the SQLite database, e.g.:
>>
>> g.copy vector=points,points_mirror
>>
>
>> Importing the points_mirror layer to R takes 3 minutes instead of 3 hours, for instance.
>
> Which GRASS version are you using? This should not happen with recent versions of GRASS 7.4 and 7.6.
>
> Markus M
>
>>
>> While mirroring vectors imported with v.in.ogr solves the issue, it is an inelegant solution that also takes up unnecessary space. I would prefer to instruct v.in.ogr somehow to force it to use the SQLite database. I could not find any reference in the manual, is it possible to do?
>>
>> Thank you.
>>
>> --
>> Luís Moreira de Sousa
>> Email: luis.de.sousa at protonmail.ch
>> RingID: ring:7ca91d83f4f9dec82fec9f1144b8e5c1ef2a110c
>> URL: https://ldesousa.github.io
>>
>> Sent with ProtonMail Secure Email.
>>
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