[Qgis-user] R: Importing a raster into a Geopackage

[Sebastian Gutwein]

This looks like the same issue you are having.
github.com/qgis/QGIS/issues/38227
According to the documentation linked in the issue you need to set the band
count to 1 otherwise it defaults to 4.
gdal.org/drivers/raster/gpkg.html
I have not tried this to see if it works.

On Tue, Dec 1, 2020 at 11:52 AM Nicolas Cadieux <njacadieux.gitlab at gmail.com>
wrote:

> Hi,
>
> Looking at it now.  I see what you see.  I will try a few things.
>
> Nicolas
> On 2020-12-01 11:42 a.m., Alberto Vavassori wrote:
>
> Hi Nicolas,
>
> thank you for the answer. I send the raster that I am interested in.
>
> Alberto
>
>
>
> *Da:* Nicolas Cadieux <njacadieux.gitlab at gmail.com>
> <njacadieux.gitlab at gmail.com>
> *Inviato:* martedì 1 dicembre 2020 17:40
> *A:* Alberto Vavassori <alberto.vavassori at polimi.it>
> <alberto.vavassori at polimi.it>
> *Cc:* qgis-user at lists.osgeo.org
> *Oggetto:* Re: [Qgis-user] Importing a raster into a Geopackage
>
>
>
> Hi,
>
> Send a sample data set if you can't figure it out.
>
> Nicolas
>
> On 2020-12-01 10:35 a.m., Nicolas Cadieux wrote:
>
> Hi,
>
> Perhaps this can help: https://gdal.orgdrivers/raster/gpkg.html
>
>
>
> “Various kind of input datasets can be converted to GeoPackage raster :
>
> ·        Single band grey level
>
> ·        Single band with R,G,B or R,G,B,A color table
>
> ·        Two bands: first band with grey level, second band with alpha
> channel
>
> ·        Three bands: Red, Green, Blue
>
> ·        Four band: Red, Green, Blue, Alpha
>
> GeoPackage rasters only support Byte data type.”
>
> My guess is that if the original raster does not correspond to one of the
> categories above, it will be converted to the closest format.
>
>
>
> Nicolas Cadieux
>
> https://gitlab.com/njacadieux
>
>
>
> Le 1 déc. 2020 à 09:58, Alberto Vavassori <alberto.vavassori at polimi.it>
> <alberto.vavassori at polimi.it> a écrit :
>
> 
>
> Hello everybody. I have an issue regarding the Geopackage format. I have
> tried to import a singleband raster file (it represents the land cover,
> thus every pixel has a single integer value corresponding to the land cover
> class), but this operation seems to modify the raster characteristics: the
> raster becomes a 4-bands raster and the pixels values change accordingly
> (basically, the original raster is saved in the Geopackage as an RGB
> image). It seems to be a bug of QGIS. I have also tried to use GDAL
> translate through the processing toolbox of QGIS to convert the TIFF file
> to a Geopackage file, but the result is the same.
>
> Has anybody faced this problem? May anybody suggest a way to work this
> problem out?
>
> Thank you.
>
> Alberto
>
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> --
>
> Nicolas Cadieux
>
> https://gitlab.com/njacadieux
>
> --
> Nicolas Cadieuxhttps://gitlab.com/njacadieux
>
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