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

Thu Jan 18 06:58:07 PST 2024

Thanks Even :-)

On Thu, Jan 18, 2024 at 3:48 PM Even Rouault <even.rouault at spatialys.com>
wrote:

> cf improvement https://github.com/OSGeo/gdal/pull/9101
>
> https://docs.ogc.org/is/17-083r2/17-083r2.html#76 mentions "TileMatrices
> for more detailed scales is possible if they follow the same pattern."  .
> The current limitation to 25 was to make some computations easier, but
> supporting up to 30 (or 29 when MatrixWidth=2 at zoom level = 0) is now
> possible.
> Le 18/01/2024 à 15:35, Rahkonen Jukka via gdal-dev a écrit :
>
> 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>
> <philippe.ghesquiere at airbus.com>
> *Lähetetty:* torstai 18. tammikuuta 2024 16.06
> *Vastaanottaja:* Rahkonen Jukka <jukka.rahkonen at maanmittauslaitos.fi>
> <jukka.rahkonen at maanmittauslaitos.fi>
> *Kopio:* gdal-dev <gdal-dev at lists.osgeo.org> <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> 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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