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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Can you imagine using a custom tiling schema instead of the world-wide
</span>InspireCRS84Quad<span lang="EN-US" style="mso-fareast-language:EN-US">? These commands work<br>
<br>
gdal_create -of GTiff -co COMPRESS=DEFLATE -outsize 2000 2000 -burn 255 -burn 0 -burn 0 -bands 3 -ot Byte -a_srs epsg:32631 -a_ullr 1000000 1000002 1000002 1000000 1mm.tif<br>
<br>
gdal_translate -of GPKG 1mm.tif 1mm.gpkg<br>
<br>
Notice the fixed ullr for making the image north-up.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">-Jukka Rahkonen-<br>
<br>
<br>
<br>
gdal_translate -of GPKG 1mm.tif 1mm.gpkg<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Input file size is 2000, 2000<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">0ERROR 6: Only north-up non rotated geotransform supported<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">..ERROR 1: Raster table 1mm not correctly initialized due to missing call to SetGeoTransform()<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>Lähettäjä:</b> gdal-dev <gdal-dev-bounces@lists.osgeo.org>
<b>Puolesta </b>Philippe Ghesquiere via gdal-dev<br>
<b>Lähetetty:</b> torstai 18. tammikuuta 2024 15.22<br>
<b>Vastaanottaja:</b> gdal-dev <gdal-dev@lists.osgeo.org><br>
<b>Aihe:</b> [gdal-dev] GPKG raster creation : error with too small resolution<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dear all,<br>
<br>
I just had an error while converting an image to GPKG. This image has a very small resolution and gdal_translate pops up an error message.<br>
<br>
<u>Test image :</u><br>
gdal_create -of GTiff -co COMPRESS=DEFLATE -outsize 2000 2000 -burn 255 -burn 0 -burn 0 -bands 3 -ot Byte -a_srs epsg:32631 -a_ullr 1000000 1000000 1000002 1000002 1mm.tif<br>
<br>
<u>Conversion to GPKG :</u><br>
gdal_translate -of GPKG -co TILING_SCHEME=InspireCRS84Quad -co ZOOM_LEVEL_STRATEGY=UPPER 1mm.tif 1mm.gpkg<br>
Input file size is 2000, 2000<br>
ERROR 1: Could not find an appropriate zoom level<br>
<br>
<u>Analysis</u><o:p></o:p></p>
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<p class="MsoNormal">The error is due to <a href="https://github.com/OSGeo/gdal/blob/master/ogr/ogrsf_frmts/gpkg/ogrgeopackagedatasource.cpp#L3169" target="_blank" title="Follow link">
ogrgeopackagedatasource.cpp</a> (line 3169), and it does make sense : the zoom level is too high (Z>25).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">However, wouldn't it be possible to modify gdal_translate behavior ?<o:p></o:p></p>
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<p class="MsoNormal">For example, we could :<o:p></o:p></p>
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<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
let GDAL compute the appropriate zoom level : -co ZOOM_LEVEL_STRATEGY=AUTO/LOWER/UPPER,<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
optionally specify a maximum zoom level : -co MAX_ZOOM_LEVEL=18<o:p></o:p></li></ul>
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<p class="MsoNormal">What do you think ?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Philippe<o:p></o:p></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
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