This paper describes a robust method for recovering an optimal DEM and its variance from multiple, randomly orientated views of a surface. The method generates a set of DEM tiles in a common coordinate system from multiple overlapping images, and then employs the concept of self-consistency to detect and remove errors from the tiles. The clean tiles are averaged together to form a low noise com...

Im vorliegenden Beitrag wird ein agentenbasiertes Simulationsmodell vorgestellt, mit dem der Day-Ahead-Strommarkt, der Markt für positive Minutenreserve und der Emissionshandel abgebildet wird. Die Betreiber von Kraftwerken werden als lernende Agenten (mit Q-Learning) abgebildet und konkurrieren auf der Anbieterseite der Strommärkte. Das Modell wurde mit Daten des deutschen Strommarkts simulier...

Zusammenfassung Mit einem Sprachenidentifizierer für 45 Sprachen wurden die prozentualen Anteile der verschiedenen Sprachen an allen Webseiten durch eine repräsentative Analyse des Indexes von AllTheWeb vom Sommer 1999 ermittelt. Zunächst wird die Funktionsweise und die Performanz des verwendeten Sprachenidentifizierers kurz dargestellt Im Hauptteil werden die Ergebnisse der Index-Auswertung pr...

Studies of DEM error have consistently found a link between terrain characteristics such as slope shape or steepness and error. This link is explored by looking at error in relation to various geomorphometric measures for a study area in Scotland. The magnitude of error is found to vary systematically between convex, planar and convex areas and measures of terrain roughness show some degree of ...

The remote sensing technique has been widely applied in global topographic survey, e.g., for computing a digital elevation model (DEM). The synthetic aperture radar (SAR) is able to perform a synoptic monitoring of the Earth under all-weather and day-and-night conditions. Among the SAR-derived DEM reconstruction techniques, four different methods, i.e., clinometry, grammetry, interferometry and...

Herrn Prof. Dr. L. Z e r v a s , Athen, danken wir für wertvolle Hinweise, Herrn Dr. J. G l i e m a n n , Kopen­ hagen, für die biologischen Teste. Dem Gesamtverband der Textilindustrie in der Bundesrepublik Deutschland, der Arbeitsgemeinschaft Industrieller Forschungsver­ einigungen e. V. und dem Bundesministerium für Wirtschaft danken wir für die Förderung des For­ schungsvorhabens 1318. Fern...

High-altitude Himalayan terrain exhibits extreme geometric distortion along north-facing (dilation) and south-facing (compression) slopes as observed in satellite stereo data with high look angles. In the present study, Cartosat-1 stereo pairs have been used for generating Digital Elevation Model (DEM) using Differential Global Positioning System based Ground Control Points. DEM quality assessm...

KEM (Key Encapsulation Mechanism) and DEM (Data Encapsulation Mechanism) were introduced by Shoup to formalize the asymmetric encryption specified for key distribution and the symmetric encryption specified for data exchange in ISO standards on public-key encryption. Shoup defined the “semantic security (IND) against adaptive chosen ciphertext attacks (CCA2)” as a desirable security notion of K...

Digital elevation models (DEM) are numerical representation of terrain elevation data that has been used in a wide range of spatial analysis applications. The principles for acquisition, storage, management, update, spatial analysis, visualization as well as integration with other systems are reasonably well known. However, as DEM applications are becoming increasingly more widespread, so does ...