Synthèse bibliographique : le modèle numérique de terrain de haute résolution, ses erreurs et leur propagation

Abstract

The high resolution digital terrain model, its errors and their propagation. A review. The digital elevation model (DEM) is a numerical representation of terrain topography. DEM is a very useful model, allowing the extraction of many parameters such as slope, drainage network, etc. These parameters are regularly used for decision making in environmental management. Therefore, it is very important to generate a reliable DEM, to quantify the errors that remain even after error removal, and also to estimate the impact of these errors on decision parameters. This article presents the current state of knowledge regarding the generating of high resolution DEMs. Fine-resolution (several points per m²) topographic data collection technologies are presented and compared. DEM errors and the methods used to remove them are then highlighted and discussed. Finally, error propagation methods that are used to propagate errors through GIS (Geographic Information System) applications are presented.

Keywords

• Mathematical model
• topography
• surveying
• measures
• photogrammetry