This article introduces a novel algorithm for automatic extraction of canyons which was developed in the Department of the Remote Sensing and Land Information Systems at the University of Freiburg (FELIS). The algorithm detects canyons by means of user-defined dimension parameters and elevation information provided in a Digital Terrain Model (DTM). The extraction procedure is based on the geome...

Cartosat-1 is the first Indian Remote Sensing satellite able to collect in-track high resolution stereo images with a 2.5m pixel size. Since Cartosat-1 has no multispectral cameras, it was mainly developed for topographic mapping and Digital Terrain Model (DTM) generation. In the framework of the Cartosat-1 Scientific Assessment Programme, the Politecnico di Milano University (Italy) evaluated ...

Classical shape from shading (SFS) is based on the analysis of the intensity values of a single digital image in order to derive three dimensional information of the depicted scene. It involves the orthographic projection for the transformation from object to image space and has been successfully applied to weakly textured images. In general the illumination conditions must be known, Lambertian...

Laser scanning had a huge impact on topographic information systems (TIS) and geographic information systems (GIS). Compared to other data acquisition methods, airborne and terrestrial laser scanner systems have a high degree of automation and allow capturing surfaces in various scales. It turns out that laser scanners are both, efficient and economical measuring tools for cultural heritage obj...

The most commonly used topographic vector data, the reference data of national geographic information systems (GIS) are currently two-dimensional. The topography is modelled by different objects which are represented by single points, lines and areas with additional attributes containing information, for instance on the function and size of the object. In contrast, a digital terrain model (DTM)...

Historical tsunami events have impacted the Istanbul coasts along the Sea of Marmara. Offshore seismic sources may trigger these tsunamis directly or through coseismic underwater failure. The 1999 zmit Bay tsunami led to more comprehensive analyses of these events which are generally caused by underwater failures close to the target coastline. Waves so generated can arrive at nearby coastlines ...

Comet is an interactive visualisation tool, which supports real-time visualisation and exploration of very large Digital Terrain Models (DTMs) on commodity workstations. Comet is designed to be portable across a range of different hardware architectures and network environments, and has been implemented using a novel combination of standard software components. A tile-based Distributed Shared M...

Abstract. Remote sensing of forest landscape is sometimes quite challenging, considering the rugged terrain, remote areas and presence dense canopy. LiDAR capable generating three-dimensional (3D) structure forest. But when research focused on a small area that needs information Terrestrial Laser Scanner (TLS) proves to be an efficient way acquiring information. TLS instrument used acquire data...