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Hello,
about your digital terrain data, I think they should be in raster ASCII
format;
you can try to find some useful information in the following pages:
http://164.214.2.54/mel/dted1inf.html
http://www.topodepot.com/downloadables/dugdem.txt
http://corona.eps.pitt.edu/www_GPS/courses/GEO2446/GIS-DEM/30arcsecond.html

Good luck

--
Giacomo Delli
Istituto Agronomico per l'Oltremare
Via A. Cocchi 4, 50131 FIRENZE
Tel. +39 055 5061227
Fax. +39 055 5000868
e-mail: [EMAIL PROTECTED]


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