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I will need to do a 3D representation of a terrain and I heard surfer is ideal, but then I do not have a DEM file of the region, I know Google Earth and Map could help, but I do not know how? If there is another way round, please where can I get one for free?

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    If you are just looking for a free DEM you can use SRTM 1arc second (~30m) available through NASAs EarthExplorer
    – Kersten
    Sep 22, 2015 at 10:42
  • @Kersten This really should be the answer. I wish I could up-vote your comment twice. Sep 22, 2015 at 11:10

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You can use TCX converter for generating DEM from google earth. Check this Contours and DEM from Google Earth

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You can use ArcGIS with ArcGoogle tool to download DEM from Google Earth and create contours from DEM

Here's clip for you: https://www.youtube.com/watch?v=OKZ4gJokg7o

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