[gdal-dev] Appending to an existing GeoPackage raster table

[Brad Hards]

> My information on GeoPackages may be outdated, since the specification has
> changed many times since I read it last.
> But as far as I remember, the main goal was that a GeoPackage is a
> complete/finished collection of data ready for deployment.
I'm reasonably familiar with GeoPackage, and don't recall it ever only being 
considered a "finished" product. The current interop experiment (related 
tables) is actually about recording extra observations in GeoPackage.

> Even though it may be internally a Database, it should not be treated as 
> such.
> So the word 'append' is inappropriate in this concept.
"Citation needed" :-)

> If the condition on which the original raster coverage was created no longer
> applies, then a new raster coverage must be created that fulfill these new
> conditions.
That is a narrow and inappropriate view. In any case, I'm happy to build the 
whole raster, just need a way to do it.

> In this case you are extending the bounds of the raster coverage, which may
> work when extending in a East/West direction, but not in a North/West
> direction (assuming that North/West is 0,0). With mbtiles this would be no
> problem since the use a world wide tms numbering for the tiles.
You can do this with GeoPackage too, supported by GDAL as one of the tiling 
schemes (http://www.gdal.org/drv_geopackage_raster.html)

> Creating a new raster coverage, with new extent/bounds and sources should be
> the idea.
This is my main need. I was only looking for how to create a raster coverage 
with different content at different zoom levels.  I will try the gdalwarp 
solution next, although I did make it work with a simple bash loop and some 
spatialite SQL commands.

Brad