Thank you all for your answers.
Alessandro: the resources folder contains only read-only data (reference
rasters or vectors from French national geographic institute, not to be
modified). I deploy these layers on every workstation. Is it still a bad
practice for read-only reference data to use this folder ?
Raymond: indeed I'm currently working on a plugin, and I've seen
QgsPathResolver. But documentation for this class is quite terse. but
I'll continue to investigate and experiment.
Jorge: interesting setup. Does the offline editing plugin work when
everything is in database ? In other words, are raster layers converted
offline ?
Cheers.
Yann
Le 05/12/2019 à 13:16, Jorge Gustavo Rocha a écrit :
Hi,
In my setup - using PGSERVICES - all vector, raster, styles and projects
are stored on database. This is my preferred way to organize the data:
on a database. QGIS Server also takes advantage of this setup and
publish the projects directly from the database, using the rasters (in
db or out of db rasters).
The few things I'm not sharing on the database are SVG, layout images
and fonts.
There are problems with Postgresql/GDAL access to Postgresql, but if
using PGSERVICES it works.
Best regards,
Jorge
On 05/12/19 11:18, Alessandro Pasotti wrote:
On Thu, Dec 5, 2019 at 11:58 AM Yann Voté <[email protected]
<mailto:[email protected]>> wrote:
Hi all,
I can't find a solution to the following issue, or a way to work
around
it: I have created a project with some PostgreSQL layers to edit and
some raster layers on local filesystem. I work on a Linux computer
and
have put the local layers into the pkg data path resources folder
(/usr/share/qgis/resources/local/raster.gpkg).
Sorry but this is not a good idea, that path is usually not
user-writeable and should not be used to store any user related
information.
But if I understand correctly what you were trying to do I'm afraid
there is not a solution: the concept of "relative path" means relative
to the project's storage path but that path does not make any sense in
case of a POSTGRES storage (because POSTGRES is not a local
filesystem-based DB in the same sense as GPKG or SPATIALITE are), so
your file-system based asset paths are not (and cannot be) converted
to relative paths because there is no project path we can relate to.
This makes portability an issue if the project has filesystem-based
layers (rasters in your case).
There is no solution I'm aware of, storing rasters into PG is also not
a viable option at the moment because support is currently buggy (see:
https://github.com/qgis/QGIS/issues/30392).
Cheers
I have also saved the project into PostgreSQL so that it can be
shared
easily. Other users work on Windows computers and have the same
rasters
under pkg data path resources folder
(C:/PROGRAM~1/QGIS3~1.8/apps/qgis/resources/local/raster.gpkg).
But when
they open the project, Postgis layers are loaded fine, but QGIS says
that raster.gpkg cannot be found under the /usr/share/... path.
I would expect that layers in the pkg data path resources folder are
saved with the inbuilt: prefix, but in fact they are not.
Moreover, it
seems that one cannot select "Relative" for saving layer paths, in
project properties, when project is saved to PostgreSQL. Looks
sensible
(what is the relative path to a PostgreSQL table ?), but then what
can I
do to share a PostgreSQL project with local layers ?
We all use QGIS 3.8.3.
Thank you for any advice !
Cheers
Yann
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