[postgis-devel] Regular raster blocking (was: Real extent feature lost after metadata as views)

[Pierre Racine]

> > This constraint ensures that all tile are of the same size and hence, do not
> > overlap and do not leave gaps in the coverage.
> 
> > I think there is no need any more to ensure that "All tiles must be non-
> > overlapping" or "There must be no gap" since both are ensured by the
> > conjunction of the three conditions. Any counter example?
> 
> Well this is false.. It is not because tiles are of the same size that they cover all
> the extent without leaving gaps or overlaps.

Well I come back on this... This was not false. This was true. If all upper left corners are aligned on a grid defined by the upper left corner of the extent AND the block sizes, AND all tiles are the same size as the block sizes, THEN there should be no gaps, AND we could allow missing tiles (because we do not have to check for gaps).

So I maintain my first version :-)

Pierre