![]() air photos (and now satellite images) from which a stereo-model (of contours or points). 8) Select the Contours feature and make sure the display is ON. Make sure the display of the Tin Hull (the boundary of the surface model) is ON. Digital Terrain Model (DTM) In some countries, a DTM is actually synonymous with a DEM. Digital Terrain Models In the normal project flow, the existing ground digital terrain model (.TIN) file is. Contour Data must be at a correct Z elevation to be processed in a Terrain Model. What is a Digital Terrain Model (DTM) When you refer to the USGS LiDAR Base Specification (on page 28), a digital terrain model (DTM) actually has two definitions depending on where you live. A Digital Terrain Model (DTM) is a digital file consisting of a grid of regularly spaced points of known height which when used with other digital data, such as maps or orthophotographs can provide a 3D image of the land surface. Raster digital elevation model (DEM) data are the most common. Most Digital Terrain Modeling applications will also process the segments between the vertices as breakline data, and can filter out vertices too close together or add interpolated vertices if required. ![]()
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