[postgis-users] How to access raster data?

[Vortex]

Hello!

Is gdal_contour the only way to access raster data
within postgis? 
I need height information for single points and
i think GTOPO30 raster data would be sufficient.

Why does gdal_contour produces non-closed linestrings?
Are they at the border? I suppose i have to convert
the linestrings to polygons to search for matching
contour lines (planes in this case)?

Klaus