Actually I saw that WKT Raster was avalible, but I was unsure about it
with it only in the beta stages and there does not appear to be much in
the way of documentation yet. I did check out the read me file in the
SVN repository, and it seems to conflict with the documentation.
http://trac.osgeo.org/postgis/wiki/WKTRaster/Documentation01
https://svn.osgeo.org/postgis/spike/wktraster/README
The read me file says that it will not work with the current version of
PostGIS, but the online documentation says it will. Not sure which one
is correct.
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I've done this before using a similar approach you have and using GDAL to
read the elevations from the GeoTiff and dump them into an elevations table
with point geoms. If I had to do it again, now that we have WKT Raster in
the works, I'd probably try that if you don't mind compiling yourself.
http://trac.osgeo.org/postgis/wiki/WKTRaster
Mateusz has a nice test drive example of WKTRaster
http://mateusz.loskot.net/2009/03/30/crunching-wkt-rasters/
Hope that helps,
Regina
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