[gdal-dev] Using GeoPackage as vector tile container?

[Pirmin Kalberer]

Hi Jukka,

Am Donnerstag, 31. Mai 2018, 16:21:51 CEST schrieb Even Rouault:
> On jeudi 31 mai 2018 14:02:32 CEST Rahkonen Jukka (MML) wrote:
> > Hi,
> > 
> > I wonder what would it need to store vector tiles into GeoPackage instead
> > of MBTiles. Officially probably a new extension like the Tiled Gridded
> > Coverage Data extension, but wouln't it technically be rather simple to
> > write vector tiles as BLOBs into the tile_data column instead of png or
> > jpeg BLOBs?
> 
> "Rather simple", well that's arguable from an implementation point of view,
> since the architecture of the MVT and GeoPackage drivers isn't naturally
> compatible to make them work together currently.
> 
> But conceptually yes, the vector tiles as BLOBS of a tile pyramid user table
> would be a good fit You would also need to write metadata to describe the
> layers and attributes, to avoid having to scan all the tiles to retrieve it
> (at least for OGR point of view that has a fixed schema constraint to
> expose vector features)

What speaks against declaring a Gpkg-Extension "MBTiles" which lets GDAL know 
that MVT's are stored in MBTile layout? MVT's are quite special geometries, 
since they are stored in screen coordinates.

Regards
Pirmin