TOPOGRAPHIC FEATURES Reuven Meth and Rama Chellappa Department of Electrical Engineering and Center for Automation Research University of Maryland, College Park, MD ABSTRACT Automatic Target Indexing using Synthetic Aperture Radar (SAR) imagery is investigated. Target areas are located using a Constant False Alarm Rate (CFAR) detector. Classi cation of targets is performed using the Topographic...

Effective flood assessment and management depend on accurate models of flood events, which in turn are strongly affected by the quality of digital elevation models (DEMs). In this study, HEC-RAS was used to route one specific water discharge through the main channel of the Eskilstuna River, Sweden. DEMs with various resolutions and accuracies were used to model the inundation. The results showe...

Introduction. One of the major unsolved puzzles about the surface of Venus is the composition and formation process of the radar-bright, low emissivity material that covers much of the high altitude terrain. Maxwell Montes, centered at a latitude of 65◦ N, is the tallest structure on Venus with elevations 12 km above the mean planetary radius (MPR) [1]. In the case of Maxwell Montes, the emissi...

Aerial photographs and satellite imagery have been evaluated manually by the operators for a long time for the extraction of the contour line and DEM data. Computer technology and digital image processing technologies have been developed and this development provides to perform these extraction processes automatically or semi-automatically. The aim of making the processes automatic is to increa...

A high-resolution Digital Elevation Model (DEM) (10m meshed grid) has been integrated with Geographic Information Systems (GIS). So far, 50m-meshed DEM by the Geological Survey of Japan (GSJ) is widely used for various GIS applications such as constructing 3D systems in Japan. 50m DEM covers all over the area of Japan, which has 0.1-meter resolution in a vertical direction. The spatial resoluti...

Detailed topographic maps of the lunar poles have been obtained by Earth-based radar interferometry with the 3.5-centimeter wavelength Goldstone Solar System Radar. The interferometer provided maps 300 kilometers by 1000 kilometers of both polar regions at 150-meter spatial resolution and 50-meter height resolution. Using ray tracing, these digital elevation models were used to locate regions t...

A Digital Elevation Model (DEM) represents the height of a patch of terrain. Accuracies of DEMs vary depending upon the requirements of different applications. DEMs have been applied to a wide range of civil engineering and military planning tasks. Besides the conventional methods of creating DEMs, such as photogrammetry and manual field survey, airborne laser scanning and radar interferometry ...

TanDEM-X is a German Public Private Partnership project between DLR and EADS Astrium for a novel satellite constellation based on TerraSAR-X with the goal to generate a global digital elevation model (DEM) according to the HRTI-3 standard, i.e. 10 m horizontal spacing and 1-2 meter vertical accuracy. TerraSAR-X is a civil German X-Band Synthetic Aperture Radar (SAR) satellite to be launched in ...

Objective: When none of digital systems and scanners is accessible and it is essential to have digitized images of conventional radiographs, digital cameras can be used. The Aim of this study was to investigate whether digital images obtained by different resolutions of a digital camera are matched to the original radiographs in evaluation of caries. Methods: In this diagnostic accuracy in v...

• Digital Elevation Models (DEMs) are often used in landscape ecology to retrieve elevation or first derivative terrain attributes such as slope or aspect in the context of species distribution modelling. However, DEMderived variables are scale-dependent and, given the increasing availability of very high resolution (VHR) DEMs, their ecological relevance must be assessed for different spatial r...