[gdal-dev] GPKG raster creation : error with too small resolution

[Philippe Ghesquiere]

Hi Jukka,

I have no choice but to use the standard InspireCRS84Quad tiling grid.

Thanks for the "-a_ullr fix"

Philippe


On Thu, Jan 18, 2024 at 2:42 PM Rahkonen Jukka <
jukka.rahkonen at maanmittauslaitos.fi> wrote:

> Hi,
>
>
>
> Can you imagine using a custom tiling schema instead of the world-wide
> InspireCRS84Quad? These commands work
>
> 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
>
> gdal_translate -of GPKG  1mm.tif 1mm.gpkg
>
> Notice the fixed ullr for making the image north-up.
>
>
>
> -Jukka Rahkonen-
>
>
>
> gdal_translate -of GPKG  1mm.tif 1mm.gpkg
>
> Input file size is 2000, 2000
>
> 0ERROR 6: Only north-up non rotated geotransform supported
>
> ..ERROR 1: Raster table 1mm not correctly initialized due to missing call
> to SetGeoTransform()
>
>
>
> *Lähettäjä:* gdal-dev <gdal-dev-bounces at lists.osgeo.org> *Puolesta *Philippe
> Ghesquiere via gdal-dev
> *Lähetetty:* torstai 18. tammikuuta 2024 15.22
> *Vastaanottaja:* gdal-dev <gdal-dev at lists.osgeo.org>
> *Aihe:* [gdal-dev] GPKG raster creation : error with too small resolution
>
>
>
>
>
> Dear all,
>
> 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.
>
> *Test image :*
> 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
>
> *Conversion to GPKG :*
> gdal_translate -of GPKG -co TILING_SCHEME=InspireCRS84Quad -co
> ZOOM_LEVEL_STRATEGY=UPPER 1mm.tif 1mm.gpkg
> Input file size is 2000, 2000
> ERROR 1: Could not find an appropriate zoom level
>
> *Analysis*
>
> The error is due to  ogrgeopackagedatasource.cpp
> <https://github.com/OSGeo/gdal/blob/master/ogr/ogrsf_frmts/gpkg/ogrgeopackagedatasource.cpp#L3169> (line
> 3169), and it does make sense : the zoom level is too high (Z>25).
>
>
>
> However, wouldn't it be possible to modify gdal_translate behavior ?
>
> For example, we could :
>
>    - let GDAL compute the appropriate zoom level : -co
>    ZOOM_LEVEL_STRATEGY=AUTO/LOWER/UPPER,
>    - optionally specify a maximum zoom level : -co MAX_ZOOM_LEVEL=18
>
> What do you think ?
>
>
>
> Philippe
>
>
>
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