Results 41 to 50 of about 168,301,947 (302)

Configurational Entropy for Optimizing the Encryption of Digital Elevation Model Based on Chaos System and Linear Prediction

Applied Sciences, 2021
A digital elevation model (DEM) digitally records information about terrain variations and has found many applications in different fields of geosciences. To protect such digital information, encryption is one technique.
Xinghua Cheng, Zhilin Li
doaj   +1 more source

Comparison of different DEMs for hydrological studies in the mountainous areas

The Egyptian Journal of Remote Sensing and Space Science, 2021
The optical and radar satellite data based Global Digital Elevation Models (DEMs) serve as a main data source in hydrological studies today. Open access Remote Sensing (RS) products have increasing accuracy and improved spatial resolution. The main research purposes are to study the use of AW3D30, ASTER GDEM V003 and SRTMGL1 DEMs in modeling ...
openaire   +2 more sources

The effect of grid size on the quantification of erosion, deposition, and rill network

International Soil and Water Conservation Research, 2017
Hillslope rill/interrill erosion has been investigated from the perspective of runoff transport of sediment. Recent advances in terrestrial laser scanning can provide high-resolution elevation data up to centimeter levels, and temporal digital elevation ...
Xiaoyu Lu, Yingkui Li, Robert A. Washington-Allen, Yanan Li, Haidong Li, Qingwu Hu   +5 more
doaj   +1 more source

Improving the Accuracy of TanDEM-X Digital Elevation Model Using Least Squares Collocation Method

Remote Sensing, 2023
The TanDEM-X Digital Elevation Model (DEM) is limited by the radar side-view imaging mode, which still has gaps and anomalies that directly affect the application potential of the data. Many methods have been used to improve the accuracy of TanDEM-X DEM,
Xingdong Shen, Cui Zhou, Jianjun Zhu
doaj   +1 more source

Varieties of Democracy (V-DEM) Annual Report 2019 - "Democracy Facing Global Challenges” [PDF]

, 2019
Democracy in decline in more countries than ever before. The 2019 Democracy Report is titled “Democracy Facing Global Challenges”. Democratic declines now affect more countries than ever before.

core   +1 more source

ANALYSIS AND COMPARISON OF SRTM3 DEM AND ASTER GDEM V2 [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2020
Global Geographic Information Resources Construction and Maintenance Renewal Project is in urgent need of digital elevation model worldwide. At present, the errors of ASTER GDEMv2 and SRTM3 DEM data widely used are unevenly distributed.
J. Shen, W. L. Han, L. B. Zhang, J. Ge
doaj   +1 more source

Methods for specifying the target difference in a randomised controlled trial: the Difference ELicitation in TriAls (DELTA) Systematic Review [PDF]

, 2014
<b>Background</b><p></p> Randomised controlled trials (RCTs) are widely accepted as the preferred study design for evaluating healthcare interventions.
Vale, Luke D, Ramsay, Craig R, John D Norrie, Jonathan A Cook, Douglas G Altman, Adewuyi Temitope E., Cook, Jonathan, Brian Buckley (137185), Jenni Hislop, Cynthia Fraser (563535), Fayers, Peters, Gurung, Tara, Harvey, Ian M, Kirsten Harrild, Peter Fayers (398359), Buckley, Brian R., Cynthia Fraser, Tara Gurung (493516), Fayers Peter, Luke D. Vale (563533), Cook Jonathan A., Vale, Luke D., Fayers, Peter M., Cook, Jonathan A, Harvey Ian M., Altman Douglas G., Temitope E Adewuyi, Ian M Harvey, Craig R. Ramsay (122714), Ramsay Craig R., Ian M. Harvey (563538), Harrild Kirsten, Hislop, J. (Jennifer), Buckley Brian, Vale Luke D., Harvey, Ian M., Norrie, John D, Fraser, Cynthia, Peter Fayers, Fayers, Peter, Altman, Douglas G, Douglas G. Altman (62920), Gurung, T. (Tara), Ramsay, C. R. (Craig R.), Tara Gurung, Adewuyi, Temitope E, Brian Buckley, Altman, Douglas G., DELTA group, Jonathan A. Cook (122711), Adewuyi, Temitope E., Temitope E. Adewuyi (563532), John D. Norrie (563537), Norrie, John D., Norrie John D., Ramsay, Craig R., Buckley, Brian, Altman, Douglas, Andrew H Briggs, Vale, L. (Luke), Jenni Hislop (563531), Fraser Cynthia, Gurung Tara, Cook, Jonathan A., Dr., Briggs, Andrew H., Craig R Ramsay, Hislop, Jenni, Briggs Andrew H., Hislop Jenni, Briggs, Andrew H, Harrild, Kirsten, Kirsten Harrild (563534), Andrew H. Briggs (563536), Cook, Jonathan A., Luke D Vale   +74 more
core   +1 more source

TanDEM-X DEM Calibration Status and Commissioning Phase [PDF]

, 2008
TanDEM-X is the first bistatic space-borne SAR mission. It will be formed by adding a second, almost identical spacecraft to TerraSAR X and flying them in a closely controlled formation.
Bachmann, Markus, Schwerdt, Marco, Hueso Gonzalez, Jaime   +2 more
core  

DEM Calibration Concept for TanDEM-X [PDF]

, 2006
The TanDEM-X mission comprises two fully active synthetic aperture radar satellites operating in X-band. The primary goal of this mission is the derivation of a high-precision global Digital Elevation Model (DEM) according to HRTI level 3 quality.
J. Hueso Gonzalez, H. Fiedler, M. Bachmann, M. Zink, Fiedler, Hauke, Krieger, Gerhard, Hueso Gonzalez, Jaime, Huber, Sigurd, Zink, Manfred, S. Huber, Younis, Marwan, G. Krieger, Bachmann, Markus   +12 more
core   +1 more source

Combining UAV Photogrammetry and TLS for Change Detection on Slovenian Coastal Cliffs

Drones
This article examines the combined use of UAV (Unmanned Aerial Vehicle) photogrammetry and TLS (Terrestrial Laser Scanning) to detect changes in coastal cliffs in the Strunjan Nature Reserve.
Klemen Kregar, Klemen Kozmus Trajkovski
doaj   +1 more source