I happened to be looking at this digital terrain model of a barchan on Mars today.
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Mars Express observed this region in 2005, yielding a digital terrain model and color pictures.
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Note that contour line data or any other sampled elevation datasets ( by GPS or ground survey ) are not DEMs, but may be considered digital terrain models.
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It is also possible to create digital terrain models and thus 3-D visualisations using pairs ( or multiples ) of aerial photographs or satellite ( e . g.
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Bathymetric maps ( a more general term where navigational safety is not a concern ) may also use a Digital Terrain Model and artificial illumination techniques to illustrate the depths being portrayed.
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Some people have termed the approach " environmental correlation ", associated with using stratigraphy, digital terrain models and gamma radiometric surveys, to predict and map soil properties.
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Comparisons will be made between field-mapped inner gorge areas, streamside landslides, and channel characteristics with the same landscape features generated with digital terrain models derived from the laser altimetry.
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Blom maintains a large database of oblique and vertical aerial photography, laser data, map models such as 3D city models, digital surface models and digital terrain models, and digital orthophoto images.
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Depending on the final use intended for the data ( for example, navigation charts, Digital Terrain Model, volume calculation for dredging, topography, or bathymetry ) this data must be thinned out.
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Additionally, the very local variations of the VD can be computed from gravimetric survey data and by means of digital terrain models ( DTM ), using a theory originally developed by Vening-Meinesz.
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