Results 1 to 10 of about 3,408,938 (300)

Evaluation of Vertical Accuracy of the WorldDEM™ Using the Runway Method [PDF]

open access: yesRemote Sensing, 2016
Accuracy assessment of a global digital elevation model (DEM) is an important and challenging task primarily because of the difficulties and costs associated with securing a reliable and representative reference dataset. In this article, we report on the
Kazimierz Becek   +2 more
doaj   +7 more sources

A combined vertical accuracy compensation method for automatic drilling and riveting of aircraft panels with variable curvatures [PDF]

open access: yesJournal of Intelligent Manufacturing and Special Equipment, 2023
Purpose – Aircraft structures are mainly connected by riveting joints, whose quality and mechanical performance are directly determined by vertical accuracy of riveting holes.
Junshan Hu   +4 more
doaj   +3 more sources

Vertical accuracy evaluation of freely available latest high-resolution (30 m) global digital elevation models over Cameroon (Central Africa) with GPS/leveling ground control points.

open access: yesInternational Journal of Digital Earth, 2019
Digital Elevation Models (DEMs) contain topographic relief data that are vital for many geoscience applications. This study relies on the vertical accuracy of publicly available latest high-resolution (30 m) global DEMs over Cameroon. These models are (1)
Loudi Yap   +5 more
doaj   +2 more sources

ASSESSMENT OF 3D POSITIONAL ACCURACY OF GEODETIC OBSERVATIONS FROM SINGLE CORS [PDF]

open access: yesGeological Behavior, 2022
Geodetic observations for both vertical and horizontal control networks cannot be compromised for any reason in accuracy and precision in the field of geomatics. Due to the error-prone nature of survey measurements, standards are established to allow for
Oladosu S. O., Ehigiator-Irughe R.
doaj   +1 more source

Accuracy Assessment of High-Resolution Globally Available Open-Source DEMs Using ICESat/GLAS over Mountainous Areas, A Case Study in Yunnan Province, China

open access: yesRemote Sensing, 2023
The Open-Source Digital Elevation Model (DEM) is fundamental data of the geoscientific community. However, the variation of its accuracy with land cover type and topography has not been thoroughly studied.
Menghua Li   +3 more
doaj   +1 more source

Evaluating Vertical Accuracies of Open-Source Digital Elevation Models over Multiple Sites in China Using GPS Control Points

open access: yesRemote Sensing, 2022
Digital elevation models (DEMs) are widely used across a range of fields. Several open-source global DEMs have been released, including the advanced land observing satellite world 3D 30 m DEM (AW3D30DEM), advanced spaceborne thermal emission and ...
Xiangping Liu   +3 more
doaj   +1 more source

Global DEMs vary from one to another: an evaluation of newly released Copernicus, NASA and AW3D30 DEM on selected terrains of China using ICESat-2 altimetry data

open access: yesInternational Journal of Digital Earth, 2022
A good understanding of the quality of digital elevation model (DEM) is a perquisite for various applications. This study investigates the accuracy of three most recently released 1-arcsec global DEMs (GDEMs, Copernicus, NASA and AW3D30) in five selected
Hui Li   +4 more
doaj   +1 more source

Analysing the spatial context of the altimetric error pattern of a digital elevation model using multiscale geographically weighted regression

open access: yesEuropean Journal of Remote Sensing, 2023
Many freely available Digital Elevation Models (DEM) have increasingly been used worldwide due to the difficulty in acquiring accurate elevation data in some regions, emphasizing the need to investigate their accuracy and the factors that may influence ...
Zuleide Ferreira   +2 more
doaj   +1 more source

Evaluation of the Efficiency of SfM-Photogrammetry in Obtaining DEM from Google Earth Images [PDF]

open access: yesJES: Journal of Engineering Sciences, 2023
In this study, we seek to evaluate the efficiency of SfM Photogrammetry in obtaining Digital Elevation Model (DEM) from the free Google Earth browser, by simulating the aerial photography of the terrain displayed by this browser, calculating the ...
Ahmed A Elashiry, Omar Al Khalil
doaj   +1 more source

Application of Kinematic GPR-TPS Model with High 3D Georeference Accuracy for Underground Utility Infrastructure Mapping: A Case Study from Urban Sites in Celje, Slovenia

open access: yesRemote Sensing, 2020
This paper describes in detail the applicability of the developed ground-penetrating radar (GPR) model with a kinematic GPR and self-tracking (robotic) terrestrial positioning system (TPS) surveying setup (GPR-TPS model) for the acquisition, processing ...
Nikolaj Šarlah   +3 more
doaj   +1 more source

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