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If you want to create a "quick" topo overlay of a smaller chunk of MS while you are waiting give this a shot.  In a few hours or less you could have a few hundred square KM of topo.

http://forums.groundspeak.com/GC/index.php?showtopic=189762&st=450&p=3563764&#entry3563764

If you download MapsetToolKit it will alow you to load the map into MapSource.

http://cypherman1.googlepages.com/

I have used it to load many IMG maps into the MapSource program.  If it will then alow you to cut the Cali map into smaller pices to fit on the CS I'm not sure.

I'm currently using the tutorial here to download and process the topo data for Missouri.  My hope is that I can figure out how to turn it into a transparent map to overlay over the (very good) Ibycus USA maps.  This would give me a verily good topo map.

http://www.ibycus.com/ibycususa/

Try here for Cali Topo:

http://www.vr6.com/gps/map-dl.htm

I think I just figured it out.

ArcGrid will always have 4 quads (most of the time) and GeoTiff works differently so it will usually have one file.

I'm trying to download USGS DEM data for Missouri (GeoTiff format) following the instructions on this web site using the links in the Missouri spreadsheet.  My intention is to create a Missouri Topo map.

When I use the GeoTiff links I only get 1 out of the 4 quads from the extract.cr.usgs.gov. website (tied this with 10 links and same result each time).  I'm assuming this is not the way it should go as the same link for the ArcGrid data has all 4 quads every time.

Any ideas?

Thanks