Background: New technologies for terrain reconstruction have increased the availability of topographic data at a broad range of resolutions and spatial extents. The existing digital elevation models (DEMs) can now be updated at a low cost in selected study areas with newer, often higher resolution data using unmanned aerial systems (UAS) or terrestrial sensors. However, differences in spatial c...

The concept and the computation of terrain representation error (ETR) are investigated and total DEM error is presented as an accuracy index for DEM evaluation at a global level. A promising method of surface modelling based on the theorem of surfaces (SMTS) has been developed. A numerical test and a real-world example are employed to comparatively analyze the simulation accuracy of SMTS and th...

abstract land surface hydrological models has importance in the determination of soil moisture and temperature, the rate of evapotranspiration, stream flow by emphasis on the land surface physical and dynamic process descriptions. in this research, vic land surface hydrological model has been used for the land surface temperature and stream flow determination. the vic runoff simulation in each ...

Der Artikel geht zunächst auf die Bedeutung zellulärer Automaten für die Simulation dynamischer Prozesse ein. Im weiteren wird ein Schwerpunkt auf die Simulation der Lagerung von Massengüttern eingegangen, sogenannten Schüttgütern, für die es aufgrund mangelnder Berechnungsverfahren bis heute keine befriedigende numerische Lösung gibt. Mittels zellulärer Automaten sind hierbei zumindest für gro...

It is essential to construct a high precision digital elevation model (DEM) annually or seasonally in tidal flats to monitor coastal erosion. To monitor active coastal changes using the tidal flat DEM, a vertical accuracy of higher than 20 cm is required. We apply space-borne radar interferometry (InSAR) to the Korean tidal flats to test the feasibility of InSAR in tidal flats. We also investig...

Zusammenfassung Zur Simulation pastöser Materialien in der DEM wird ein Kontaktmodell vorgestellt, welches beim Kontaktverlust zweiter ursprünglich Kontakt befindlicher Partikel (diskrete Elemente) eine anziehende Kraft (Kohäsionskraft) basierend auf einem polynomischen Ansatz bildet. Dieses folglich kapillare ist somit Lage, pastöse für Industrie orientierte DEM-Simulationen nachzubilden. Zum ...

The simulation of ground clutter is the key and knot problem in radar simulation system. The simulation of ground clutter based on DEM is studied. It is introduced how to use fractal arithmetic to produce random digital elevation. After obtaining the orographic’s height, draw the 3D terrain with the OpenGL technology, in order to realize the demonstration of 3D terrain. Based on DEM, terrain is...

The paper describes the development and performance of parallel algorithms for the discrete element method (DEM) software. Spatial domain decomposition strategy and message passing inter-processor communication have been implemented in the DEMMAT code for simulation of visco-elastic frictional granular media. The novel algorithm combining link-cells for contact detection, the static domain deco...