View source for Talk:Digital elevation model

= Article discussion =
:: ''This section is meant solely for discussion purposes. <br/> For a draft of the article, see [[#Article draft]].
== Possible contents and links==

From Liu & Mason 2010 <ref name=Liu10></ref> 
DGM's are a subgroup of [[Surface models]] (should there be an own category?)
and can be obtained by
# [[Photogrammetry]]
# [[Laser altimetry]]
# [[SAR inferometry]]

Related articles already existing in this wiki are:
* [[Creating a DEM from vector data]]
* [[Evaluation of digital elevation models]]

= Article draft =
::''DEM stands for Digital elevation model. It can be represented as a regular grid of points or as a [[Triangular irregular network]] of points. DEMs are the basis for digitally produced relief maps.''

Digital elevation models are sets of data representing the estimated height of a surface
above a certain level, i.e. a [[Geodetic datum]]. It may represent the [[Wikipedia:Elevation|elevation]] of the bare earth,
or include objects as buildings or tree canopies <ref name=Liu10>  Liu, J. G. & Mason, P. Essential Image Processing and GIS for Remote Sensing. (John Wiley & Sons, 2010).</ref>. 

== Types of DEMs ==
There are no official Definitions of different subgroups of digital elevation models,
but the probably most used terms are '''Digital surface model (DSM)''' and 
'''Digital terrain model (DTM)'''; the first model may quantify the height of the earth including
objects on it's surface, while the latter models the elevation of the mere ground. 
Still, sometimes both terms are used to describe bare-earth models, leaving the original
'''Digital elevation model''' term for models including objects above ground level<ref name=Liu10></ref>.

== DEMs in forestry ==

== References ==
<references/>

== External links ==
[http://en.wikipedia.org/wiki/Digital_elevation_model  Digital elevation model on Wikipedia]