Micha, Marco and Thomas Thank you all for such a fast reply. Being a member in the user mailing list definitely has better results than the forum.
Micha, I just came back from the Survey Dept today and they agreed to supply me later a DEM sample file with x,y and Z values for me to test so that is a non issue. I personally wanted their data because if I wanted other public agencies to use QGIS, I must convince them that Survey Dept DEM data is compatible with QGIS. It seems from what you guys written, the direction I should go along is GRASS and the way you explain, it looks simple.I am still a newbie muddling in QGIS so the next issue will be how to install GRASS, I'll look this up in the QGIS user guide but should I get stuck again, it would be wonderful to get your help again. I am really alone here in govt. agencies as far as QGIS is concerned, in fact hardly anyone has heard of QGIS so getting feedbacks from you is a real blessing. Thank you again. Abbas
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