[postgis-users] Rasters in PostGIS

[yoda2nd]

Hello All,

I am working on a project where we need to be able to query a raster 
image (i.e. GeoTiff) to obtain elevation information.  Basically, I need 
to be able to import a rather large data set and be able to query it on 
demand and export just the data I need at the time back into a raster 
format for further processing (very similar to the USGS Seamless Data 
server).

I am thinking importing the raster data as individual points (x,y,z) in 
the EWKT format is probably my best bet.

I am not totally sure I am on the right track here, so I am hoping 
someone can let me know if I am going down the right track or nudge me 
back onto it.  So I just have a few basic questions: