IMT developed three key types of terrain modelling or spatial data capture files called called Digital Elevation Models (DEM’s), Digital Terrain Models (DTM’s) and Digital Surface Models (DSM’s). As these names are often used interchangeably by customers, and IMT employs varying methods to produce the needed support files, it is important to define with the customer the exact requirements for each project. When properly constructed, these models provide the foundation for quality outputs in any mapping or GIS project.
A properly constructed terrain model is perhaps the most useful and versatile aspect of any mapping or GIS project. Comprised of breaklines, form lines and discrete spot elevations (DEM points), IMT’s terrain models provide greater accuracy and detail than the industry standard's "DEM files".
The accuracy and reliability of volume calculations, slope analysis, terrain mapping, contours, and the creation of orthophotos are all governed by the quality of the DTM files used.
IMT's digital photogrammetric workstations (ISM DiAP) provide real-time superimposition of compiled vector and point data. Coupled with the capability of online "tinning" and contour creation, IMT technicians are able to immediately establish the quality of either a supplied or compiled in-house terrain model. Anomalous data points can be immediately identified and corrected to ensure the final product meets our client's requirements.
IMT employs varying methods to produce the DEM files, which are tailored to our client's specific end use. For more information on the factors that govern the quality and accuracy of a DEM, or for a price quote on a specific project, contact us at firstname.lastname@example.org (Attention: Business Development).