This general statement is also if not in particular valid for acquiring and processing Digital Elevation Models. On one hand, important developments like radar-interferometric sensors (e.g., the Shuttle Radar Topographic Mission, SRTM) or laser scanners (e.g., the operational systems TopoSys, TopScan or ALTM) have become available to the market. On the other hand, important tasks along the data...

Real-time rendering and multiresolution modeling of triangulated surfaces has attracted growing interest over the last decade. For interactive visualization of very large scale grid digital elevation models efficiency is a particularly important aspect. The graphics rendering load must be controlled by reducing the number of rendered primitives using level-of-detail (LOD) techniques, adaptive e...

Mathematical problems of digital terrain analysis include interpolation of digital elevation models (DEMs), DEM generalization and denoising, and computation of morphometric variables by calculation of partial derivatives of elevation. Traditionally, these procedures are based on numerical treatments of two-variable discrete functions of elevation. We developed a spectral analytical method and ...

All digital data contain error and many are uncertain. Digital models of elevation surfaces consist of files containing large numbers of measurements representing the height of the surface of the earth, and therefore a proportion of those measurements are very likely to be subject to some level of error and uncertainty. The collection and handling of such data and their associated uncertainties...