Hi all!

I recently worked on adding a GridFormat for geopackage rasters.  The 
geopackage module already has a really nice mosaic gridformat for geopackage 
tiles that I borrowed from extensively.  I did this before realizing that the 
geopackage standard dropped raster support, so I am not sure if you would be 
interested in this work or not.  If there is interest, I can send a pull 
request.

https://github.com/jericks/geotools/commit/6e005e1bc27e940add339cfb87a313f9305c1e4f

So far it only really works with GeoTiff rasters because WorldImage rasters 
throw an exception because the bounds is unknown. It appears from the code that 
someone is working on getting a patch applied to the WorldImageReader to 
support explicitly setting an envelope. 

https://github.com/geotools/geotools/blob/master/modules/unsupported/geopkg/src/main/java/org/geotools/geopkg/GeoPackage.java#L1010

Thanks,
Jared


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