Multiresolution models are getting more and more importance for a scale-sensitive modelling of spatial data. In principle, they allow the representation of the data at a variety of scales. Of special importance are adaptive methods, where the resolution does not need to be uniform but may be variable. Then, error indicators are used to control the local resolution of the model. In this paper, w...

Nowadays, different Digital Elevation Models (DEMs) are typically available for the same geographic area, which are provided by different sensors and/or processing techniques. Each DEM contains measurement errors due to the acquisition technology, the atmospheric conditions, the processing chain and the characteristics of the observed terrain. DEM fusion aims at overcoming the limitations of in...

The Topographical Survey Division of the Surveys and Mapping Branch, Energy, Mines and Resources, Canada, employs dense digital elevation model (DEM) data for the production of hypsographic overlays for conventional and orthophoto maps. The Gestalt Photomapper (GPM II/3), installed as a production system since summer of 1977, uses computer controlled electronic scanning and image correlation te...

A system to visualize and edit digital elevation models based on interferometric synthetic aperture radar data is presented. The visualization and exploration of digital elevation models has been traditionally achieved through the use of two-dimensional interfaces. As virtual reality interfaces have increasingly proven to offer a high degree of presentation realism and several interaction facil...

A system to visualize and edit digital elevation models based on interferometric synthetic aperture radar data is presented. The visualization and exploration of digital elevation models has been traditionally achieved through the use of two-dimensional interfaces. As virtual reality interfaces have increasingly proven to offer a high degree of presentation realism and several interaction facil...

Raster based digital elevation models (DEM) are the basis of some of the most important GIS workflows: hydrologic modeling, site suitability, and cost path analysis. While there are several techniques for generating digital elevation models (DEMs), none of them can produce a true elevation surface. Locally varying measurement error and the inexactness of the interpolation methods contribute to ...