Re: Elevations in 3D
- To: mathgroup at smc.vnet.net
- Subject: [mg7872] Re: [mg7844] Elevations in 3D
- From: Russell Towle <rustybel at foothill.net>
- Date: Thu, 17 Jul 1997 15:35:36 -0400
- Sender: owner-wri-mathgroup at wolfram.com
>Is it possible to visualize in 3D in Mathematica Student Ver 2.2.4, the >elevations of tracts of land? > >rolando Hi Rolando, I have a MMA version 2.2 notebook on MathSource (search under my name or Digital Landscapes) which reads elevation data from USGS digital elevation model files (DEMs) and passes the data to ListPlot3D. It is time-intensive and memory-intensive, because very many polygons are created to form the land surface. There is an excellent source for the high-resolution 7.5 minute DEM files for here in California. For elsewhere in the US one has to make do with the free 1-degree DEMs which are monsters to work with (9 MB in size). Internet addresses to obtain these files are included in my notebook. There are DEM-like data sets for elsewhere in the world but my notebook can't handle these. Russell Towle Giant Gap Press: books on California history, digital topographic maps P.O. Box 141 Dutch Flat, California 95714 ------------------------------ Voice: (916) 389-2872 e-mail: rustybel at foothill.net ------------------------------