Re: [CAD_CAM_EDM_DRO] contour mapping

Hi Nelson,

Yes! I have wanted to do just that! Look for DLG and DEM files of the
area you are interested in. DEM's might be easier, elevation over a X,
Y grid. I like the increased contour information in the DLG's, but they
are harder to work with.

http://edcwww.cr.usgs.gov/doc/edchome/ndcdb/ndcdb.html

There are free DLG viewers available.

I've been able to generate simple DXF files (BIG FILES), but I have not
been able to get the data into reasonable order, so that it can be cut.

I did some recent work with Gerber files and I think using a L-R
recursive decent of a binary tree might be the answer.

Depending on the scale you select, those buildings are going to be quite
small! 1:100K DLG, 1:24K DLG will be of interest.

I'd like to explore this further.

HTH

Alan KM6VV


npalen@... wrote:

>
> Hello all--I've been wanting to CNC machine a scaled "relief map" of
> the wheat and cattle farm where I grew up in North Central Kansas
> U.S.A. This consists of several hundred acres of rolling terrain
> including the farmstead. All I have left are the memories and an
> aerial photo of the buildings.
> Would anyone have knowledge of what it would take to utilize data
> from the U.S. Geological Survey (URL below) to program the contours?
> I would like to construct scale models of the buildings from memory
> and place them on what I envision to be about a 24" square "map".
> The various "ponds" filled with something to simulate water would top
> it off! Can anyone please help me? Thanks. Nelson
> http://navigation.helper.realnames.com/framer/1/262/default.asp?
> realname=U%2ES%2E+Geological+Survey&url=http%3A%2F%2Fwww%2Eusgs%
> 2Egov&frameid=1&providerid=262&uid=30116898