Results 221 to 230 of about 11,296 (261)
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Based on Digital Elevation Model (DEM) for Farmland Landscape Pattern
International Journal of Smart Home, 2016Taking Gongyi city as a study area and by using the ArcGIS software, this paper analyzed the characteristics of farmland landscape patterns at the five slope gradients by Digital Elevation Model（DEM）, and explored the human disturbance on farmlands. The results indicated that the distribution of farmland landscape elements differed obviously with slope
Yansong Wang +3 more
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The effects of wavelet compression on digital elevation models (DEMs)
IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004, 2004This paper investigates the effects of lossy compression on floating-point digital elevation models using the discrete wavelet transform. The compression of elevation data poses a different set of problems and concerns than does the compression of images.
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An evaluation of digital elevation models (DEMs) for delineating land components
Geoderma, 2014Abstract Land component boundaries often coincide with transitions in environmental land properties such as soil, climate and biology. Image segmentation is an effective method for delineating terrain morphological units from digital elevation models (DEMs). This paper compares the land components derived from five DEMs.
Zama Eric Mashimbye +2 more
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An evaluation of available digital elevation models (DEMs) for geomorphological feature analysis
Environmental Earth Sciences, 2020A digital elevation model (DEM) is an essential dataset for many land feature analyses, such as geomorphological feature analyses, which are very important for many types of studies. The present study involved the evaluation of five of the most common DEMs and their derived geomorphological features in the Humrat Assahn basin.
Majed Ibrahim +3 more
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Effect of Digital Elevation Model (DEM) Resolution on the Hydrological and Water Quality Modeling
World Environmental and Water Resource Congress 2006, 2006The resolution of digital elevation model (DEM) used for watershed delineation and data extracted from the delineated watershed relevant to hydrography plays an important role in the calibration of hydrological models. The effect of DEM resolution on the drainage length, watershed area and average slope are studied in many earlier works. DEM resolution
Ramesh S. V. Teegavarapu +2 more
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Computers, Environment and Urban Systems, 2004
Numerous investigators have examined ways in which digital elevation data can be used to define landform-based units that act as basic spatial and structural entities for soil, terrain or ecological maps. No proposed system of automated terrain or ecological mapping has, to our knowledge, advanced beyond research investigation to achieve routine ...
R. A. MacMillan +2 more
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Numerous investigators have examined ways in which digital elevation data can be used to define landform-based units that act as basic spatial and structural entities for soil, terrain or ecological maps. No proposed system of automated terrain or ecological mapping has, to our knowledge, advanced beyond research investigation to achieve routine ...
R. A. MacMillan +2 more
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Development of digital elevation models (DEMs) for agricultural applications
2018Topographic data collected using RTK-DGPS-equipped farm vehicles during field operations could add additional benefits to the original capital investment in the equipment through the development of high accuracy field-DEMs. Repeated surveys of elevation data from repeated field operations may improve DEM accuracy over time.
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Digital Elevation Models (DEM) for the Analysis of the paved surface of Linear Infrastructures
2020<p>The proposed study aims at analyzing effective surveying techniques and methodologies to acquire more detailed metric data and to support traditional surveying techniques on linear infrastructures.</p><p>In particular, from measurements acquired with LiDAR technique, it is possible to obtain an ...
Margherita Fiani +1 more
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Control quality of open source Digital Elevation Models (DEMs) in Tunisia
Revue Internationale de Géomatique, 2017Digital Elevation Models (DEMs) are an invaluable source of information in large area studies. Some of the DEMs such as Advanced Spaceborne Thermal Emission Radiometer-Global Digital Elevation Model (ASTER GDEM), shuttle radar topography mission (SRTM), and Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010) are freely available for the ...
Noamen Rebai, Hammadi Achour
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On the Quantification of Surface Changes using Grid‐based Digital Elevation Models (DEMs)
Transactions in GIS, 2000This paper discusses the quantification of vertical surface displacements by means of grid‐based digital elevation models (DEMs). The surface changes are quantified by comparing altitude and different topographic parameters, which have a geomorphic significance with respect to surface changes.
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