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<p>Hi all:</p>
<p>I ran the r.stats to get a list of each pixel value on my test
data (A small DEM) before and after conversion to a geopackage
(see second image below). The values and summary stats are
identical for the two rasters but the default legend entry has a
different min and maximum value. So, I can conclude that the data
is being written correctly but the default display parameters for
the geopackage are different than a geotiff. <br>
</p>
<p>Kirk<br>
</p>
<p><br>
</p>
<p><img src="cid:part1.38923AC4.55E08CCC@nortekresources.com" alt=""></p>
<p><img src="cid:part2.EFB94A13.48A05634@nortekresources.com" alt=""></p>
<div class="moz-cite-prefix">On 12/1/2020 3:24 PM, Nicolas Cadieux
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:63d2a8fe-f268-b30d-64a9-0356aa93ed7f@gmail.com">
<p>Hi,</p>
<p>I changed the link so you have access to more files.</p>
<p><a class="moz-txt-link-freetext"
href="https://drive.google.com/drive/folders/1fMl9odowUFFRQFK61rTxgHeom_D8ymN6?usp=sharing"
moz-do-not-send="true">https://drive.google.com/drive/folders/1fMl9odowUFFRQFK61rTxgHeom_D8ymN6?usp=sharing</a></p>
<p>Nicolas<br>
</p>
<div class="moz-cite-prefix">On 2020-12-01 1:58 p.m., Kirk Schmidt
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5ec4beb6-b113-b69a-75b1-3faf50d1fc74@nortekresources.com">
<p>Hi Nicolas<br>
</p>
<p>I did the same and the legend indicates a change magnitude
but if I subtract the geopackage raster from the original, all
pixels equal zero.</p>
<p> Kirk<br>
</p>
<div class="moz-cite-prefix">On 12/1/2020 2:36 PM, Nicolas
Cadieux wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ffcfec85-52a4-5348-bbec-ca4119398c04@gmail.com">
<p>Hi,</p>
<p>Tried this:<br>
</p>
<p>gdal_translate -of GPKG -b 1
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/test.gpkg</p>
<p>I read 4 band and still get data modifications.</p>
<p>Nicolas<br>
</p>
<div class="moz-cite-prefix">On 2020-12-01 1:28 p.m., Kirk
Schmidt wrote:<br>
</div>
<blockquote type="cite"
cite="mid:2a8cb288-13e4-17e2-a9f4-f5d38f5be283@nortekresources.com">
<p>Hi Nicolas:</p>
<p>try the -b 1 parameter. I just tried this and wrote a
single band raster from a 3 channel tiff.</p>
<p>Kirk<br>
</p>
<div class="moz-cite-prefix">On 12/1/2020 2:03 PM, Nicolas
Cadieux wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1e19158c-e195-f6e6-d839-8abb05739258@gmail.com">
<p>I tried <br>
</p>
<p>gdal_translate -of GPKG -co "BAND_COUNT=1"
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/TEST.gpkg for the creation and
<br>
</p>
<p>C:\>gdal_translate -of GPKG -co "TILE_FORMAT = TIFF"
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/TEST.gpkg</p>
<p>Same problem. I wonder if we need to change the
reading options... <a class="moz-txt-link-freetext"
href="https://gdal.org/drivers/raster/gpkg.html"
moz-do-not-send="true">https://gdal.org/drivers/raster/gpkg.html</a></p>
<h2>"Opening options</h2>
<p>By default, the driver will expose a GeoPackage dataset
as a four band (Red,Green, Blue,Alpha) dataset, which
gives the maximum compatibility with the various
encodings of tiles that can be stored. It is possible to
specify an explicit number of bands with the BAND_COUNT
opening option."</p>
<p>The problem could be when QGIS Reads the file, not when
it writes the file. I explains why we see 4 bands but
not why values are changing. I would make a bug report
or ask the question on the gdal dev group to get Even
Rouault's attention.<br>
</p>
<p>Nicolas<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2020-12-01 12:17 p.m.,
Sebastian Gutwein wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAED_52pFuAzSH3UtyR6S4M_dKBJ60pU2Jx1+P0Be2EOEOkGv7g@mail.gmail.com">
<div dir="ltr">This looks like the same issue you are
having. <a
href="http://github.com/qgis/QGIS/issues/38227"
moz-do-not-send="true">github.com/qgis/QGIS/issues/38227</a>
<div>According to the documentation linked in the
issue you need to set the band count to 1
otherwise it defaults to 4. </div>
<div><a
href="http://gdal.org/drivers/raster/gpkg.html"
moz-do-not-send="true">gdal.org/drivers/raster/gpkg.html</a><br>
</div>
<div>I have not tried this to see if it works. </div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Dec 1, 2020
at 11:52 AM Nicolas Cadieux <<a
href="mailto:njacadieux.gitlab@gmail.com"
moz-do-not-send="true">njacadieux.gitlab@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote">
<div>
<p>Hi,<br>
</p>
<p>Looking at it now. I see what you see. I will
try a few things.</p>
<p>Nicolas<br>
</p>
<div>On 2020-12-01 11:42 a.m., Alberto Vavassori
wrote:<br>
</div>
<blockquote type="cite">
<div>
<p class="MsoNormal"><span>Hi Nicolas,</span></p>
<p class="MsoNormal"><span lang="EN-US">thank
you for the answer. I send the raster that
I am interested in.</span></p>
<p class="MsoNormal"><span lang="EN-US">Alberto</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<div>
<div>
<p class="MsoNormal"><b><span>Da:</span></b><span>
Nicolas Cadieux <a
href="mailto:njacadieux.gitlab@gmail.com"
target="_blank"
moz-do-not-send="true"><njacadieux.gitlab@gmail.com></a>
<br>
<b>Inviato:</b> martedì 1 dicembre
2020 17:40<br>
<b>A:</b> Alberto Vavassori <a
href="mailto:alberto.vavassori@polimi.it"
target="_blank"
moz-do-not-send="true"><alberto.vavassori@polimi.it></a><br>
<b>Cc:</b> <a
href="mailto:qgis-user@lists.osgeo.org"
target="_blank"
moz-do-not-send="true">qgis-user@lists.osgeo.org</a><br>
<b>Oggetto:</b> Re: [Qgis-user]
Importing a raster into a Geopackage</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p>Hi,<span></span></p>
<p>Send a sample data set if you can't figure
it out.</p>
<p>Nicolas</p>
<div>
<p class="MsoNormal">On 2020-12-01 10:35
a.m., Nicolas Cadieux wrote:</p>
</div>
<blockquote>
<p class="MsoNormal">Hi, </p>
<div>
<p class="MsoNormal">Perhaps this can
help: <a
href="https://gdal.orgdrivers/raster/gpkg.html"
target="_blank" moz-do-not-send="true">https://gdal.orgdrivers/raster/gpkg.html</a></p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p> <span>“Various kind of input datasets
can be converted to GeoPackage raster
:</span></p>
<p> <span><span>·<span> </span></span></span><span>Single
band grey level</span></p>
<p> <span><span>·<span> </span></span></span><span>Single
band with R,G,B or R,G,B,A color table</span></p>
<p> <span><span>·<span> </span></span></span><span>Two
bands: first band with grey level,
second band with alpha channel</span></p>
<p> <span><span>·<span> </span></span></span><span>Three
bands: Red, Green, Blue</span></p>
<p> <span><span>·<span> </span></span></span><span>Four
band: Red, Green, Blue, Alpha</span></p>
<p> <span>GeoPackage rasters only support
Byte data type.”</span></p>
<p> <span>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. </span></p>
</div>
<div>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">Nicolas Cadieux </p>
<div>
<p class="MsoNormal"><a
href="https://gitlab.com/njacadieux"
target="_blank"
moz-do-not-send="true">https://gitlab.com/njacadieux</a></p>
</div>
</div>
<div>
<p class="MsoNormal"><br>
<br>
</p>
<blockquote>
<p class="MsoNormal">Le 1 déc. 2020 à
09:58, Alberto Vavassori <a
href="mailto:alberto.vavassori@polimi.it"
target="_blank"
moz-do-not-send="true"><alberto.vavassori@polimi.it></a>
a écrit :</p>
</blockquote>
</div>
<blockquote>
<div>
<p class="MsoNormal"> <span></span></p>
<p class="MsoNormal"><span
lang="EN-US">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.</span></p>
<p class="MsoNormal"><span
lang="EN-US">Has anybody faced
this problem? May anybody suggest
a way to work this problem out?</span></p>
<p class="MsoNormal"><span
lang="EN-US">Thank you.</span></p>
<p class="MsoNormal"><span
lang="EN-US">Alberto</span></p>
<p class="MsoNormal"><span>_______________________________________________<br>
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</blockquote>
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</blockquote>
<pre>-- </pre>
<pre>Nicolas Cadieux</pre>
<pre><a href="https://gitlab.com/njacadieux" target="_blank" moz-do-not-send="true">https://gitlab.com/njacadieux</a></pre>
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</blockquote>
<pre cols="72">--
Nicolas Cadieux
<a href="https://gitlab.com/njacadieux" target="_blank" moz-do-not-send="true">https://gitlab.com/njacadieux</a></pre>
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Nicolas Cadieux
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<pre class="moz-signature" cols="72">--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: <a class="moz-txt-link-abbreviated" href="mailto:kirk@nortekresources.com" moz-do-not-send="true">kirk@nortekresources.com</a>
Web: <a class="moz-txt-link-abbreviated" href="http://www.nortekresources.com" moz-do-not-send="true">www.nortekresources.com</a></pre>
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Nicolas Cadieux
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<pre class="moz-signature" cols="72">--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: <a class="moz-txt-link-abbreviated" href="mailto:kirk@nortekresources.com" moz-do-not-send="true">kirk@nortekresources.com</a>
Web: <a class="moz-txt-link-abbreviated" href="http://www.nortekresources.com" moz-do-not-send="true">www.nortekresources.com</a></pre>
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<a class="moz-txt-link-freetext" href="https://gitlab.com/njacadieux" moz-do-not-send="true">https://gitlab.com/njacadieux</a></pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: <a class="moz-txt-link-abbreviated" href="mailto:kirk@nortekresources.com">kirk@nortekresources.com</a>
Web: <a class="moz-txt-link-abbreviated" href="http://www.nortekresources.com">www.nortekresources.com</a></pre>
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