Any good idea on how to detect and fix existing files? How many existing
files will be out there?
--
Jody Garnett
On 26 April 2017 at 13:17, Torben Barsballe <tbarsba...@boundlessgeo.com>
wrote:
> I've discovered some interesting behaviour in the GeoPackage Raster Mosaic
> implementation over the last few days.
>
> I tried viewing a GeoPackage generated from the GeoServer GeoPackage WMS
> output format in QGIS, and observed that tile order is reversed along the
> y-axis.
>
> QGIS used GDAL for parsing GeoPackages. After running this issue by the
> GDAL team, I was directed to this line of the OGC GeoPackage spec
> <http://www.geopackage.org/spec/#tile_matrix>:
>
> The tile coordinate (0,0) always refers to the tile in the upper left
>> corner of the tile matrix at any zoom level, regardless of the actual
>> availability of that tile
>
>
> Adding some test cases to the GeoTools GeoPackage plugin, I can confirm
> that GeoTools gets this order wrong. Among other things, this means that
> GeoTools / GeoServer will incorrectly read valid GeoPackage files. A fix
> can be found here: https://github.com/geotools/geotools/pull/1567
>
> Moving along to GeoServer, it appears there are similar problems with the
> GeoServer GeoPackage Community module, namely in
> the GeoPackageGetMapOutputFormat.
>
> I believe I have a fix, but am currently being slowed down by the fact
> that the GeoPackage module tests don't seem to be passing on master.
>
>
> *This issue does bring up a problem*: Because GeoTools / GeoServer is
> consistently wrong (a GeoPackage generated by GeoServer will be read in as
> "correct"), this bug fix could cause problems for anyone who has solely
> been using GeoPackage Rasters that were generated by GeoTools / GeoServer.
>
> For more details:
> https://osgeo-org.atlassian.net/browse/GEOT-5715
> https://osgeo-org.atlassian.net/browse/GEOS-8112
> https://trac.osgeo.org/gdal/ticket/6871
>
> Torben
>
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