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

[Rahkonen Jukka]

Hi,

I am not sure how standard the level 25 is for the InspireCRS84Quad, the INSPIRE technical guidance stops at 17. But I believe that you know your own use case and have considered also that EPSG:3857 at 1 mm resolution is good for you.

The number of tiles at level 25 is 2^50= 1.1259E+15. TileCol and TileRow would get rather large numbers but I suppose that it is not an issue.

-Jukka Rahkonen-

Lähettäjä: Philippe Ghesquiere <philippe.ghesquiere at airbus.com>
Lähetetty: torstai 18. tammikuuta 2024 16.06
Vastaanottaja: Rahkonen Jukka <jukka.rahkonen at maanmittauslaitos.fi>
Kopio: gdal-dev <gdal-dev at lists.osgeo.org>
Aihe: Re: [gdal-dev] GPKG raster creation : error with too small resolution

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<mailto: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<mailto: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<mailto: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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