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See our world wide production support for Television, Large Format Film, Video Games, Scientific & Planetary 3D Visualizations, and TV Commercials.

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End of the road for Landsat 5. USGS has st … read more

Date Added: 15/02/2012

 

EarthOnDrive and Tererra Incorporated are … read more

Date Added: 15/01/2012

 

Tererra and Terra-Meida-Services are partn … read more

Date Added: 15/12/2011
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DSM

DSM
A Digital Surface Model (DSM) is an elevation model that includes the tops of buildings, trees, powerlines, and any other objects. Commonly this is seen as a canopy model and only 'sees' ground where there is nothing else overtop of it.
 
A Digital Elevation Model (DEM) is a 'bare earth' elevation model, unmodified from its original data source (such as lidar, ifsar, or an autocorrelated photogrammetric surface) which is supposedly free of vegetation, buildings, and other 'non ground' objects.
 
A Digital Terrain Model (DTM) is effectively a DEM that has been augmented by elements such as breaklines and observations other than the original data to correct for artifacts produced by using only the original data. This is often done by using photogrammetrically derived linework introduced into a DEM surface. An example is hydro-flattening commonly seen in elevation models done to FEMA specificationsl
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