[postgis-devel] [wktraster] Regular blocking and rotation

Mateusz Loskot Mateusz.Loskot at cadcorp.com
Thu Nov 19 03:31:02 PST 2009


I think rotation property of regular blocking needs to be
specified explicitly and clearly in the WKT Raster specification.

Current document [1] makes explicit use of word "rotation" only once:

5. The extent field must be a simple rectangle (non-rotated).

Next, there is no rotation included in the schema of RASTER_COLUMNS table.

It seems to be enough to conclude that regular blocking coverage
is never rotated. But, is this conclusion correct?
I've scanned through all archived WKT Raster discussions 
and I couldn't find any confirmation.

[1] http://trac.osgeo.org/postgis/wiki/WKTRaster/SpecificationWorking01

Best regards,
Mateusz Loskot
Senior Programmer, Cadcorp

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