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Re: difference between DEM and DSM [message #71986 is a reply to message #71985]

Fri, 30 July 2010 10:43

Mort Canty
Messages: 134
Registered: March 2003

Senior Member

Am 30.07.2010 16:52, schrieb skymaxwell@gmail.com:
> Good day !
>
>
> I want create digital elevation model (DEM) and digital surface
> model(DSM) by IDL.
> I know how to do DEM, but how build DSM ?
> What data required to build it and what theory ? Any links to read
> about this subject will appreciate.
>
>
> Thanks
>

Wikipedia?

A digital elevation model - also sometimes called a digital terrain
model (DTM) - generally refers to a representation of the Earth's
surface (or subset of this), excluding features such as vegetation,
buildings, bridges, etc. The DEM often comprises much of the raw
dataset, which may have been acquired through techniques such as
photogrammetry, LiDAR, IfSAR, land surveying, etc. A digital surface
model (DSM) on the other hand includes buildings, vegetation, and roads,
as well as natural terrain features. The DEM provides a so-called
bare-earth model, devoid of landscape features. While a DSM may be
useful for landscape modeling, city modeling and visualization
applications, a DEM is often required for flood or drainage modeling,
land-use studies, geological applications, and much more.

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[Message index]

		Re: difference between DEM and DSM By: Klemen on Sun, 01 August 2010 02:00
		Re: difference between DEM and DSM By: skymaxwell@gmail.com on Fri, 30 July 2010 13:46
		Re: difference between DEM and DSM By: Ben Kamphaus on Fri, 30 July 2010 10:52
		Re: difference between DEM and DSM By: Mort Canty on Fri, 30 July 2010 10:43

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