> I don't know how accurate is input and how accurate should be output but try
> this:
> 
> 1. Open image with lines in image manipulation software.
> 2. Assign each height to separate intensity of gray with rule: lowest height
> is black, largest height is white.
> 3. Take filler/bucklet tool and fill each region (and line) of height range
> with apropriate gray intensity (I hope lines are closed)

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.

-- 
Tim Cook
http://empyrean.scifi-fantasy.com

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