It was in Feb - March 2012. I was then using AutoCAD Civil 3D 2012. I had faced a problem of getting ground data for a large surface by using satellite imageries processed by some government wing of USA (NASA?), have lost track of it. Any body who can suggest a link so I can trace my way back there?
Thanks a lot.
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Perhaps you were using SRTM data? Try this link.
http://www2.jpl.nasa.gov/srtm/
Thanks a lot. It was indeed SRTM.
I managed to extract data from " Global Data Explorer" Prima facie it seems ok. It is an ASTER Global GDEM ArcASCII file which gives elevation in a grid format. I may be able to convert this as a three column *.csv file and import to any CAD file. Is their a shorter route?
Not that I'm aware of. I've used this data also, but someone in our mapping department converted it for me to csv. If you can find or build a conversion tool I would be interested in seeing it.
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