[postgis-devel] WKTRaster ST_MapAlgebra

[David Zwarg]

Greetings,

I was reviewing the working spec (
http://trac.osgeo.org/postgis/wiki/WKTRaster/SpecificationWorking03), and
thinking about ST_MapAlgebra:

*ST_MapAlgebra(raster|geometry, [raster|geometry,…], ‘mathematical
expression’, ‘raster’ |’geometry’) -> raster/geometry***

I am considering the following question in the context of using
ST_MapAlgebra with rasters, and returning a raster. Should this function
only perform operations on similar rasters?  Meaning: do the georeferencing,
spatial reference, and pixel size have to be the same in all input rasters?

Thanks,
Zwarg
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