Results 151 to 160 of about 61,768 (206)
Some of the next articles are maybe not open access.
Terrain Synthesis from Digital Elevation Models
IEEE Transactions on Visualization and Computer Graphics, 2007In this paper, we present an example-based system for terrain synthesis. In our approach, patches from a sample terrain (represented by a height field) are used to generate a new terrain. The synthesis is guided by a user-sketched feature map that specifies where terrain features occur in the resulting synthetic terrain.
Howard, Zhou +3 more
openaire +2 more sources
2017
In principle, a digital elevation model (DEM) describes elevations of various points in a given area in digital format. In this chapter, only raster GIS based DEMs are discussed. Data for generating a DEM can be acquired from different sources such as: ground surveys, digitization of topographic contour maps, conventional aerial photographic ...
openaire +2 more sources
In principle, a digital elevation model (DEM) describes elevations of various points in a given area in digital format. In this chapter, only raster GIS based DEMs are discussed. Data for generating a DEM can be acquired from different sources such as: ground surveys, digitization of topographic contour maps, conventional aerial photographic ...
openaire +2 more sources
Digital Elevation Models By Laser Scanning
The Photogrammetric Record, 1998The TopoSys laser scanner system is designed to produce digital elevation models (DEMs) at a maximum accuracy of 0.5 m in x and y and 0.1 m in z. The regular scan pattern and the measurement frequency of 80 000 measurements per second (on average 5 measurements per m2) form the basis for high quality DEMs.The mainly automated data processing makes it ...
openaire +1 more source
Reducing elevation roundoff errors in digital elevation models
Journal of Hydrology, 1995Abstract A smoothing algorithm is presented for the removal of roundoff error, inherent in almost all digital elevation data. Elevation adjustments are kept within the tolerance of roundoff error, so that the resulting terrain model is not over smoothed.
E.James Nelson, Norman L. Jones
openaire +1 more source
Challenge of aster digital elevation model
2010 IEEE International Geoscience and Remote Sensing Symposium, 2010Accuracy of digital elevation model (DEM) obtained by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) that has along-track stereovision is investigated. The pointing offset and stability of the radiometer is one cause of the geometric deviation of the ASTER DEM attached with orthorectified image. The correction methodology to
Akira Iwasaki +5 more
openaire +1 more source
3D Digital Elevation Model Generation
2012This chapter presents techniques used for the generation of 3D digital elevation models (DEMs) from remotely sensed data. Three methods are explored and discussed—optical stereoscopic imagery, Interferometric Synthetic Aperture Radar (InSAR), and LIght Detection and Ranging (LIDAR). For each approach, the state-of-the-art presented in the literature is
Hong Wei, Marc Bartels
openaire +1 more source