Hi Sebastian and others,
I think the github has it wrong here According to the documentation,
the band count option is for _reading_ the file and not creating the
file. What I don't get is the fact that the data is being changed
significantly (but not as much as when the "rendered image" option is
selected (as expected) so that's not the problem here). I tried
QUALITY = 100 for writing to see if some compression was going on but
it's the same problem. Looks like some scaling issues. The 1 to 4 band
is not a problem (as this is the standard read option) but the value
changes are.
gdal_translate -of GPKG -co "QUALITY = 100"
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/TEST.gpkg
Nicolas
On 2020-12-01 12:17 p.m., Sebastian Gutwein wrote:
This looks like the same issue you are having.
github.com/qgis/QGIS/issues/38227
<http://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
<http://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.git...@gmail.com <mailto:njacadieux.git...@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.git...@gmail.com>
<mailto:njacadieux.git...@gmail.com>
*Inviato:* martedì 1 dicembre 2020 17:40
*A:* Alberto Vavassori <alberto.vavass...@polimi.it>
<mailto:alberto.vavass...@polimi.it>
*Cc:* qgis-user@lists.osgeo.org <mailto:qgis-user@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
<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 <https://gitlab.com/njacadieux>
Le 1 déc. 2020 à 09:58, Alberto Vavassori
<alberto.vavass...@polimi.it>
<mailto:alberto.vavass...@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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