Re: DEM data

Article View: comp.graphics.avs

Article #57

#57

From: Dr. Robin Lake
Date: Thu, 23 Jul 1992 13:36

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In article <=dsx17c@rpi.edu> clarkg@rpi.edu writes:
>I'm a novice AVS user and am wondering if anyone has written a module to
>convert DEM data into an AVS field? I have checked the Module Catalog from
>the AVS Center and did not find such a module.
>
>DEM, Digital Elevation Model, is a format used by the US Geological Survey to store elevations from digitized contour maps.  
> 
>Thanks.

We have used AVS 3 with data from a digitized countour map (X,Y,Z coordinates)
to produce a 3-D map.  The secret was to append each coordinate triple
with data necessary for the undocumented, but left over from AVS 1 (?), 
"sphere" module.

If you have your map data regularly spaced on a rectangular grid, then
I believe "field to mesh" will do the job.  Our data set was incomplete
on the grid, but "sphere" let us see what was missing.

Also see the article "Interpolating Gridded Data from Scattered Data in AVS"
by E. Wes Bethel in the AVS Network News, Winter 1992, pg 13 ff.

Rob Lake
BP Research
really at:  lake@rcwcl1.dnet.bp.com

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From: lake@cwjcc.INS.CWRU.Edu (Dr. Robin Lake)
Subject: Re: DEM data 
Message-ID: <1992Jul23.133625.29081@usenet.ins.cwru.edu>
Keywords: DEM
Sender: Robin Lake, BP Research, Cleveland, OH
Nntp-Posting-Host: cwjcc.ins.cwru.edu
Reply-To: lake@rcwcl1.dnet.bp.com
Organization: Case Western Reserve Univ. Cleveland, Ohio, (USA)
References: <=dsx17c@rpi.edu>
Date: Thu, 23 Jul 92 13:36:25 GMT
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