[Geopackage] New Blog Post

Even Rouault even.rouault at spatialys.com
Thu Dec 15 12:10:22 EST 2016

On jeudi 15 décembre 2016 11:42:12 CET Jeff Yutzler via Geopackage wrote:
> I just published a new blog post regarding the new Elevation Extension:
> http://geopackage.blogspot.com/2016/12/elevation-extension-update.html


Looks good to me on a quick skim.

A few comments:

- req 108: typo : geopackage_spatial_ref_sys should reed gpkg_spatial_ref_sys

- the requirement for the 4979 entry in gpkg_spatial_ref_sys is a bit surprising. EPSG:4979 is 
the WGS84 datum with *ellipsoidal* heights. 99.9% of the DEM you can find or buy use 
geoidal / MSL heights. EPSG:6893  = "WGS 84 / World Mercator + EGM2008 height" would 
make more sense to me.

- the design of the tile pyramid user data table joint with gpkg_2d_gridded_tile_ancillary 
looks a bit convoluted. Why not just putting the scale, offset, min, max, mean, std_dev 
columns in the tile pyramid user data table directly ?


> Regards,
> Jeff

Spatialys - Geospatial professional services
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