Elevation Models

An elevation model is a digital representation of the earth’s terrain. A digital elevation model (DEM) is an important component of many geospatial projects, particularly for engineering, energy and academic studies. A DEM is created with stereoscopic data, similar to how a 3D movie is made. Let us help you source the raw data necessary for an elevation model that satisfies both your monetary and geospatial project constraints.

Depending on the desired outcomes of your project, the earth’s surface can be represented in two manners:

  • As a digital surface model (DSM) which includes surface features such as vegetation and human-made structures.
  • As a digital terrain model (DTM) whereby the surface features in a DSM have been removed so that it represents bare earth.

Our Elevation Products

The table below summarizes the key specifications of the elevation models we offer. These DEM products have been chosen from a variety of commercial offerings for their superior quality, competitive prices and global coverage.

Product NamePost Spacing
(Resolution)
Vertical Accuracy (LE90)DSM or DTM?
Elevation3020 to 30 m10 to 20 mDSM
WorldDEM12 m< 4 mDSM + DTM
Elevation1010 m5 to 10 mDSM + DTM
Advanced Elevation Series (AES)2 to 8 m2 to 8 m*DSM + DTM
Custom DEMUp to 2 mUp to 1 m*DSM + DTM
* Vertical accuracies assume the use of ground control points during DEM production.

Deliverables

What can you expect to receive when you purchase elevation models? All elevation models can be delivered in two formats:

  • As a raster grid where each pixel has a known footprint on the ground (e.g., 1 m by 1 m) with an associated elevation (e.g., 525 m).
  • As a vector file with continuous lines, or contours, at known increments (e.g., spaced apart every 5 m) with an associated elevation (e.g., 110 m).