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Program to view GTopo data

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Hi everybody,I am looking for a program that would allow me to extract the GTopo30 altitude data for a certain georeferenced point or a small region. Can anyone recommend such a freeware program?-osman

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I discovered 3DEM a few days ago and find it excellent. Sorry I don't have the URL at hand.

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Here's the link for 3DEM:http://www.visualizationsoftware.com/3dem.htmlI found it to be much easier to use than MicroDEM. MicroDEM does lots more, but I think it _is_ overkill for what most of us need to do.I used 3DEM to merge several DEM's for my scenery, in preparation for using the SDK tools to generate mesh.andy

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Hello to allsince i download a tar file w100s10.tar from Geotopserver... i try to open it with 3dem and nothing happend. i am using Windows XP, is this a problem? i try to select the world area and then select de *.dem... but the only "error" i get is the "file-selection"-dialog does not disappear after "ok", like it has nothing selected at all. with "cancel" i get the effect of "Nothing"... what do i do WRONG :-(Thanx for any helpFrancis Baca

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