[Xastir] help with topo lines overlayed

[Jason Hitesman]

  Ok, I've seen the sample shots of topo lines overlaied on Terraserver 
imagry and other maps.  And I've read in the README.MAPS that this is 
done with SDTS data.  There's also a link that suggests getting the 
"hypsography" but I can't find any such beast at the link provided.  I 
do find the National "Hydrography" Dataset.

I have support for everything compiled into Xastir including GDAL/OGR 
but even after reading all the docs and some pages google found I can't 
figure out where to get the data files to do topo lines for my area.

Any more detailed pointers?

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Jason