Results 261 to 270 of about 166,782,770 (304)

The impact of misregistration on SRTM and DEM image differences

Remote Sensing of Environment, 2008
Abstract 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, Tim R. McVicar, LingTao Li, John C. Gallant, QinKe Yang   +4 more
openaire   +1 more source

Comparison of different drag models in CFD-DEM simulations of spouted beds

Powder Technology, 2020
Abstract 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., Hou Q., Bosio B., Arato E., Yu A.   +4 more
openaire   +2 more sources

New Cell for DEMS Applicable to Different Electrode Sizes

Electrocatalysis, 2011
Present 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, Jie Xu, Nicky Bogolowski, Peter Königshoven, Helmut Baltruschat   +4 more
openaire   +1 more source

Uncertainty of SWAT model at different DEM resolutions in a large mountainous watershed

Water Research, 2014
The 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, Ruimin, Liu, Yimeng, Bao, Jiawei, Wang, Wenwen, Yu, Zhenyao, Shen   +5 more
openaire   +2 more sources

Discussion on the Difference of the Grain Particle Parameters in Reality and DEM

2016
The 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
openaire   +1 more source

Multi-Scale DEM Generalization Processing in Different Landform Areas

Advanced Materials Research, 2013
As 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, Qiao Wan, Xiang Gao, Ya Juan Li, Xiao Mei Bi   +4 more
openaire   +1 more source

Planar terrain corrections in Bulgaria with insight into the differences due to the use of DSM and DEM

2023
The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Goyal, R., Pashova, L., Claessens, S., Dikshit, O.   +3 more
openaire   +2 more sources

Effect of differing DEM creation methods on the results from a hydrological model

Computers & Geosciences, 2007
It is known that digital elevation models (DEMs) can vary in quality depending on their method of creation. Six DEMs derived from digitised contours from the British Ordnance Survey were compared. The DEMs were used to run TOPMODEL for a small catchment in Devon.
openaire   +1 more source

DEM Studies on the Liquefaction Behavior of Particles With Different Aspect Ratios

2018
Discrete element method (DEM) provides insight into the fundamental physical principles leading to a better understanding of the complex behavior of granular materials under different loading conditions. In the reported studies adopting DEM, real particle shape is ignored, and the particles are modeled as spheres. Spherical shapes are preferred as they
null Anitha Kumari S. D., null Sitharam T. G.   +1 more
openaire   +1 more source

Comparison of Various DEMs for Height Accuracy Assessment Over Different Terrains of India

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
In this paper, the height accuracy of various DEMs such as TanDEM-X Global DEM, newly released TanDEM-X 90 m DEM, TanDEM-X ascending or descending DEM, SRTM 30 m, 90 m DEMs, provisional version of the NASADEM, and the aerial LiDAR DEM are assessed over three different Indian terrains.
Divya Sekhar Vaka, Vineet Kumar 0004, Y. S. Rao 0001, Rinki Deo   +3 more
openaire   +1 more source