Comments on: Can You Use GPS Data To Make A DEM?

By: aza

aza — Mon, 07 Dec 2009 17:02:45 +0000

this is a good site with a verry good topics, thanks
i ve bougth triton 2000 to use it in Morocco but i didnt find coordinates system referred to this country, i tried to implement conic lambert projection in user grid but didnt give position coordinates
help me solve this issue
greatfull

By: George Furey

George Furey — Tue, 28 Apr 2009 20:32:08 +0000

Alright thanks I saw that I just wasnt sure if that was the only free one out there

By: Leszek Pawlowicz

Leszek Pawlowicz — Tue, 28 Apr 2009 18:04:05 +0000

Check the comment immediately above yours.

By: George Furey

George Furey — Tue, 28 Apr 2009 17:50:31 +0000

What free software is available for creating DEMs?

By: Leszek Pawlowicz

Leszek Pawlowicz — Fri, 14 Sep 2007 15:36:10 +0000

MicroDEM has a built-in capability to convert an XYZ file into a DEM. It has to be evenly gridded, but MicroDEM has a rudimentary capability to do that, and can also construct a batch file for the Generic Mapping Tools (GMT) that use a superior gridding method. Full details in the MicroDEM help file – do a search for “ASCII XYZ” and/or “GMT Gridding” for more information.

By: jn@chromatic.us

jn@chromatic.us — Fri, 14 Sep 2007 15:09:53 +0000

I’ve been looking for a way to create DEMs out of GPS data too, but I do have the luxury of base station-corrected, survey grade GPS data. I’m interested in making DEMs from a large set of points that I can put into MicroDEM to show off the results of a survey in 3D.

By: Anonymous

Anonymous — Fri, 20 Apr 2007 19:47:54 +0000

One think you left out is that where the DEM matters the most is in rough terrain, where:
1. It is hard to get to (how do you map those steep mountain slopes).
2. GPS accuracy is even worse on the side of a mountain.