Results 71 to 80 of about 926 (118)
IEEE Journal of Selected Topics in Applied Earth Observations and Remote SensingThe orthorectified Sentinel-2 images have systematic offset errors in areas with large surface elevation changes in the cases of open pit mining, land collapse and glacier movement, which can lead to the misinterpretation of geological features ...
Jianqi Lou +3 more
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EVALUATION OF ACCURACY OF DEMS OBTAINED FROM UAV-POINT CLOUDS FOR DIFFERENT TOPOGRAPHICAL AREAS
International Journal of Engineering and Geosciences, 2017 The main objective of the study was to examine accuracies of DEMs (Digital Elevation Models) with different topographical structures generated by using the Unmanned Aerial Vehicle (UAV) point clouds. Two different terrains with flat and sloping topographical structures were selected for the study, and DEMs of these terrains were generated using eight ...
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ModellingThe discrete element method (DEM) has become an important numerical tool for investigating the interactions between agricultural machinery and granular agricultural materials.
Gustavo de Mello +2 more
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Granular Dynamics of the Mixing Processes for Different RPM Using DEM
, 2014 This paper emphasizes on the computer simulations of the granular materials via Discrete Element Method (DEM) by using open-source software LIGGGHTS. The examined process was mixing of two granular materials distinct by colour. The different initial conditions have led to finding the best way of homogenization, but it also shows the new perspective of ...
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The impact of misregistration on SRTM and DEM image differences
Remote Sensing of Environment, 2008Abstract Image differences between Shuttle Radar Topography Mission (SRTM) data and other Digital Elevation Models (DEMs) are often performed for either accuracy assessment or for estimating vegetation height across the landscape. It has been widely assumed that the effect of sub-pixel misregistration between the two models on resultant image ...
Thomas G. Van Niel +4 more
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Comparison of different drag models in CFD-DEM simulations of spouted beds
Powder Technology, 2020Abstract Spouted beds are commonly simulated through the Computational Fluid Dynamics – Discrete Element Method approach. The choice of the drag model is still a matter of debate, as they feature peculiar operative conditions. In this work, we simulated two spouted beds containing Geldart-D particles.
Marchelli F. +4 more
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New Cell for DEMS Applicable to Different Electrode Sizes
Electrocatalysis, 2011Present approaches to use simple crystal electrodes for DEMS have certain disadvantages: Thin layer cells with defined diffusion and/or convection require large single discs of 1 cm diameter; also, a part of the crystal surface has to be pressed against a spacer. Other approaches, which allow the use of small bead crystals, have the disadvantage of ill-
Abd-El-Aziz A. Abd-El-Latif +4 more
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Uncertainty of SWAT model at different DEM resolutions in a large mountainous watershed
Water Research, 2014The objective of this study was to enhance understanding of the sensitivity of the SWAT model to the resolutions of Digital Elevation Models (DEMs) based on the analysis of multiple evaluation indicators. The Xiangxi River, a large tributary of Three Gorges Reservoir in China, was selected as the study area.
Peipei, Zhang +5 more
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Discussion on the Difference of the Grain Particle Parameters in Reality and DEM
2016The discrete element method was widely used in analyzing mechanics and movement behaviors of grain particle in recent years. An application of the method in the field of grains was presented in this paper. The experiment and simulation about the angle of corn indicates that the particle shape cannot be ignored in discrete element simulations, as well ...
Huinan Sun, Zhuoqing Zhang
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Multi-Scale DEM Generalization Processing in Different Landform Areas
Advanced Materials Research, 2013As a special kind of image, the grid-based digital elevation model (DEM) is directly related with the landform and topography feature. In the real word, there are various landforms, and the results of different methods for DEM processing vary greatly. However, the discussion of using different methods in different landform areas in DEM generalization ...
Yu Min Chen +4 more
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