Results 261 to 270 of about 123,190 (309)
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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 ...
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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 ...
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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
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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
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The Establishment of the Digital Elevation Model
Applied Mechanics and Materials, 2013Contour line map and digital terrain model are widely used in practical work. With the rapid development of computer technology, computer graphics and geographic information system, they become more and more practical and their roles have become more prominent.
Chun Di Ni, Shen Kui Liu, Xiao Wei Yin
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The “M” in digital elevation models
Cartography and Geographic Information Science, 2015The “M” in digital elevation models (DEM) stands for model, which literally means “a schematic description of a system, theory, or phenomenon that accounts for its known or inferred properties and may be used for further study of its characteristics.” A DEM fulfills the requirement of “a schematic description” of terrain.
XiaoHang Liu, Hai Hu, Peng Hu
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The digital generalization principle of digital elevation model
SPIE Proceedings, 2009This paper briefly is based on the discussion of three fundamental characteristics of the ground (elevation accuracy, validity of elevation order, and the preservation of elevation features) and the concept of the model, then analyses major theoretical and practical shortcomings of the DEM generated in the mechanical model in depth, finally we proposes
Hai Hu, Jun Gao, Peng Hu
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Application of digital elevation model to volcanology.
2002Evaluation of morphological variation of Vulcano edifice using digital ...
ACHILLI, VLADIMIRO +4 more
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Resolution enhancement of ASTER digital elevation model
2011 IEEE International Geoscience and Remote Sensing Symposium, 2011The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) has acquired more than 1 million data with along-track stereovision. These data are processed to make digital elevation model (DEM) with orthorectified images. Using multiple DEMs obtained at different times, it is expected to enhance the spatial resolution.
Dai Okano, Akira Iwasaki
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Contextual void patching for digital elevation models
The Visual Computer, 2007Digital terrain models can be created by gathering a set of measurements from geometric objects. For various reasons, these models may be incomplete and thus fail to meet the requirements defined by their potential applications. In this work, we develop a novel multiresolution approach to repair the voids commonly found in digital elevation models (DEM)
Lakin Wecker +2 more
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Digital elevation models and TIN algorithms
1997This survey has explained a number of concepts on terrains, and some algorithms for various computations. The emphasis has been on TIN algorithms, because the TIN model for terrains is more elegant than the grid and contour line models. A common argument to use grids is the simplicity of the algorithms.
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