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Elevation Datasets

Data Collection

Digital Elevation Models

 

Highly accurate elevation data can be utilized in many ways by those in many different industries. Whether you are using the data for simple surface analysis or as a digital terrain model, an accurate and spatially correct elevation data set is extremely important. No matter if you are using DEMs for petroleum related activities, drainage analysis, or property planning, DDS has the right elevation models to complete your next project.

United States Digital Elevation Models - Digital Data Services offers United States Digital Elevation Models in 3, 5, 10, 30, 90, and 300 meter resolutions. With a wide-variety of resolutions and delivered file formats possible, DDS can offer you the right DEM product for your needs.    

International Digital Elevation Models - DDS offers International Digital Elevation Models in 5, 30, 90, and 1 kilometer resolutions.

Custom Digital Elevation Models - DDS offers custom DEM creation from topographic maps or from stereo satellite imagery. Custom Digital Elevation Models can be created either by digitizing existing contour lines from a topographic map, or by using stereo imagery from the 0.5 M resolution GeoEye-1 satellite.

  • DEMs Created from Topographic Maps - Typically, this is the most cost-effective between the two options of generating custom DEMs. DEM creation begins with the scanned, geo-referenced topographic map(s) or raster images. Contour Lines from the raster image are extracted, converted to digital vectors, and given elevation values. Once a digital image has been fully vectorized, a surface grid is then generated from contours with the water bodies added. The resulting resolution can be anywhere between 5-30 meters dependant on the contour intervals on the source document.
  • DEMs Created from Satellite Imagery - Available for nearly anywhere on the Earth, DDS provides a seamless, high-quality and consistent terrain data set. The terrain models are edgematched, cleaned for data anomalies, and seamlessly mosaicked. DEMs are edited within accuracy specifications to terrain height (example: buildings are not necessarily edited to the ground if they are lower than the accuracy specification). In areas where the ground cannot be seen due to dense canopy, elevation will not be edited to ground but rather will remain at canopy height. Drainage may not be monotonic due to accuracy limitations.

 

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