On Fri, 01 Mar 2002 09:15:21 -0500, Timothy R. Cook wrote:
> Problem with this is the Terraserver/USGS topographic maps aren't just
> the
> elevation lines.  They also have a red grid, roads, green areas for
> trees,
> black boxes for buildings, labels for things, et cetera.

Have you considered just getting a DEM for that area instead?  The DRG maps
aren't really made for trying to get data out of.

If you're really set on using the topo lines, you can get them in vector 
format from the USGS website without all of the extraneous data.

-- 
plane{-z,-3normal{crackle scale.2#local a=5;#while(a)warp{repeat x flip x}rotate
z*60#local a=a-1;#end translate-9*x}pigment{rgb 1}}light_source{-9red 1rotate 60
*z}light_source{-9rgb y rotate-z*60}light_source{9-z*18rgb z}text{ttf"arial.ttf"
"RP".01,0translate-<.6,.4,.02>pigment{bozo}}light_source{-z*3rgb-.2}//Ron Parker

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