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What is Digital Elevation Model (DEM)

Handbook of Research on Innovations in Database Technologies and Applications: Current and Future Trends
Set of points in a 3 dimensional coordinate system modeling a real object surface.
Published in Chapter:
Geometric Quality in Geographic Information
José Francisco Zelasco (Universidad de Buenos Aires, Argentina), Gaspar Porta (Washburn University, USA), and José Luís Fernandez Ausinaga (Universidad de Buenos Aires, Argentina)
DOI: 10.4018/978-1-60566-242-8.ch043
Both this article, referred to as Article I, and another one, Article II, entitled “Geometric Quality in Geographic Information IFSAR DEM Control”, published in this encyclopedia propose a method to evaluate the geometric integrity of Digital Elevation Models obtained by different techniques. Therefore, the theoretical aspect of the method to evaluate the geometric integrity and different stochastic hypotheses will be presented in both of them. Herein, we consider the classical topographic or aerial photogrammetry stereo images method (included ASTER or SPOT images) and we assume consistent stochastic hypotheses. In the Article II we consider Interferometry SAR (IFSAR) techniques and the stochastic hypotheses are specific according to the particular geometry involved in this technique.
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Accuracy of UAV-Based Digital Elevation Models: A Case Study in Colombia
Three-dimensional representation of the surface without objects on it.
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Augmenting Organizational Knowledge Management Using Geographic Information Systems
A three-dimensional computer graphics representation of continuous elevation values over a terrain's surface.
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