Vertical Accuracy Assessment of Open Access Digital Elevation Models Using GPS

Fazilova, Dilbarkhon; Magdiev, Khasan; Sichugova, Lola

doi:10.52939/ijg.v17i1.1701

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…(13) AW3D30: The ALOS Global Digital Surface Model (DSM) "ALOSWold3D-30m" is a highprecision global digital terrain model DSM made freely available by the Japan Aerospace Exploration Agency in May 2016; it has a horizontal resolution of 30 m (1 arcsecond) and is generated from images with a resolution of 5 m. The AW3D30 DEM was developed using millions of images acquired using a panchromatic optical sensor (PRISM) on the ALOS satellite. (14) The first version of AW3D30 was released in May 2016, and new versions have been successively released. The latest version improves the absolute and relative accuracies through additional calibration and gap filling.…”

Section: Demmentioning

confidence: 99%

Accuracy Assessment of Google Earth and Open-source Digital Elevation Models in China Using GPS on Field Control Points

Zhang,

You,

Deng

et al. 2023

Sensors and Materials

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Google Earth (GE) provides accurate and reliable global high-resolution images and can obtain the coordinates of any point on Earth's surface. A digital elevation model (DEM) is a dataset that quantitatively reflects the elevation of Earth's surface. Although GE and DEMs can be used to obtain the coordinates of any position on Earth, their open-access data can be affected by various factors, thereby inducing undesirable precision variability. Therefore, it is essential to estimate the accuracy of GE and open-source DEMs. In this study, 325 high-precision GPS survey points in 16 regions in China were used to evaluate the horizontal and vertical accuracies of GE and the elevation accuracy of two open-source DEMs. GE had a high horizontal accuracy with a root mean square error (RMSE) of 2.495 m and an error range of 1.090-4.844 m. The elevation accuracy of GE (RMSE = 2.610 m) was lower than those of TanDEM-X (RMSE = 2.055 m) and AW3D30 (RMSE = 2.373 m) DEMs. At the same time, the impacts of slope, aspect, and feature type on the accuracy of these data are studied and analyzed. The results show that the accuracy of control data are closely related to the characteristics of the study area. Overall, these findings indicate that for future studies in China, GE can be used to acquire horizontal data, whereas TanDEM-X and AW3D30 are more suitable for elevation data that have higher precision and provide a reference for relevant research on geographic information.

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Section: Demmentioning

confidence: 99%

Accuracy Assessment of Google Earth and Open-source Digital Elevation Models in China Using GPS on Field Control Points

Zhang,

You,

Deng

et al. 2023

Sensors and Materials

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show abstract

“…In earlier studies, the accuracy of DEMs, such as SRTM, ASTER GDEM, and ALOS PALSAR, was assessed using various data (DEMs of higher resolution, the utilization of Differential Global Positioning System (DGPS), terrestrial measurements (Bakiev & Khasanov, 2021). It was revealed that for the territories located near the reservoirs, ASTER DEM gives a more realistic representation of steep slopes and mountain ridges compared to SRTM or ALOS (Fazilova et al, 2021). The goal of this study is to quantify and compare the vertical accuracy of open access DEMs obtained using the Shuttle Radar Topography Mission (SRTM30), Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER GDEM2), and Advanced Land Observing Satellite (ALOS AW3D30) for the territory of the Fergana Valley in the Republic of Uzbekistan.…”

Section: Introductionmentioning

confidence: 99%

Vertical accuracy evaluation free access digital elevation models (DEMs): case Fergana Valley in Uzbekistan

Fazilova,

Arabov

2023

Earth sci. res. j.

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In this study, the vertical accuracy of the Shuttle Radar Topography Mission Digital Elevation Model Version 2.0 (SRTM30), the Advanced Spaceborne Thermal Emission and Reflection Radiometer Global DEM Version 2.0 (ASTER GDEM2), and Advanced Land Observing Satellite World 3D Digital Surface Model Version 2.1 (ALOS AW3D30) was statistically assessed using GPS data. The Fergana Valley area was chosen as a study region, where the land surface can reflect tectonic processes. The values of ellipsoidal heights of 27 points of the regional GPS network were chosen as reference data. The geometric approach using GPS/leveling data and EGM96 global geopotential model-based geoid undulations was applied for geoid surface fitting. The geoid height corrections range ranged from –0.66 m to 0.87 m. Root-Mean-Square errors of ~10.0 m, ~16.4 m, and ~6.6 m was obtained for SRTM30, ASTER GDEM2, and ALOS AW3D30, respectively. It was found that compared with the reference model, all the global DEMs in mountainous areas generally overestimated elevation and the value of vertical accuracy at a 90% confidence level by 3-6 meters exceeded the declared by distributors. But ALOS AW3D30 proved to be the most accurate DEM that best represents the topography of the earth’s surface and could be used for some engineering applications in Fergana Valley.

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Assessment of Extracting Topographic Surface Features Using Different Open Sources DEMs

Farag,

Azeez,

Sharawi

et al. 2023

Springer Proceedings in Earth and Environmental Sciences

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Vertical Accuracy Assessment of Open Access Digital Elevation Models Using GPS

Cited by 4 publications

References 20 publications

Accuracy Assessment of Google Earth and Open-source Digital Elevation Models in China Using GPS on Field Control Points

Accuracy Assessment of Google Earth and Open-source Digital Elevation Models in China Using GPS on Field Control Points

Vertical accuracy evaluation free access digital elevation models (DEMs): case Fergana Valley in Uzbekistan

Assessment of Extracting Topographic Surface Features Using Different Open Sources DEMs

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