Talk:Digital elevation model

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the differences between DEM and DTM

[edit] Merge

There had been some discussion about merging at Talk:Digital terrain model. Whitejay²⁵¹ 05:07, 5 June 2006 (UTC)

Yes with desribe differences between DEM and DTM

A DEM often implies a heightfield that is georeferenced, i.e., DEMs are more explicitly about terrain whereas heightfields are more general-purpose. Since DTM has 'terrain' in its name, it definitely implies terrain.

Another difference is that neither DEM nor DTM strictly mean "raster-based", whereas heightfields are. DEM would be a good general page about all sorts of digital elevation models, but heightfield would still be a concept unto itself.

my simple interpretation DTM refers to terrain ie: where the earth or rock stops. Everything else is ommitted. DEM refers to anything ie: tops of tree canopy, teeth, cricket pitches etc

g (land surveyor)

I've roughed in the merge, keeping DTM as a larger concept of which DEM is a subset (see for example the def here; please feel free to clean up. This is not my primary area of expertise, so I've mostly just sorted between the two articles.--Natcase 15:40, 7 December 2006 (UTC)

[edit] Image

There's a good image located here: http://www.povray.org/documentation/view/3.6.1/279/ Maybe you could get permission to use it?4.225.106.199 05:57, 6 October 2006 (UTC)