I just wrote a little deal which tries to tease out differences and
similarities between raster/vector types using "coverage" concepts. I
tried to be nontechnical. There's a pictorial "concept map" at the
beginning too.
There's a temptation to gloss over the differences and just say "use
raster as a column type the same way you'd use a geometry type". That
won't work, as the differences are subtle but important.
The crux of the article/tutorial/thingy is "what is the meaning of a table
when it has these column types?" "what does a row represent?" etc.
Check it out and edit it to your heart's content.
http://trac.osgeo.org/postgis/wiki/UsersWikiCoveragesAndPostgis
Bryce
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