Vertical accuracy assessment for open-source digital elevation models using GPS control points and watershed basins delineation using GIS
Digital elevation models (DEMs) are crucial for numerous assessments of the Earth's surface, so this research aim to evaluate the quality of several open source DEMs like advanced spaceborne thermal emission and reflection radiometer global DEM (ASTER GDEM), shuttle radar topography mission DEM...
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| 格式: | 文件 |
| 语言: | English |
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Elsevier
2023-12-01
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| 丛编: | Alexandria Engineering Journal |
| 主题: | |
| 在线阅读: | http://www.sciencedirect.com/science/article/pii/S1110016823009821 |
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| author | Loutfia Elsonbaty Hossam El-Din Fawzy Hossam Mohamed Moghazy Gehan Rashed Magda Hamed |
| author_facet | Loutfia Elsonbaty Hossam El-Din Fawzy Hossam Mohamed Moghazy Gehan Rashed Magda Hamed |
| author_sort | Loutfia Elsonbaty |
| collection | DOAJ |
| description | Digital elevation models (DEMs) are crucial for numerous assessments of the Earth's surface, so this research aim to evaluate the quality of several open source DEMs like advanced spaceborne thermal emission and reflection radiometer global DEM (ASTER GDEM), shuttle radar topography mission DEM (SRTM DEM), SENTINEL-1, and TerraSAR-X for digital elevation measurement (TanDEM-X). TanDEM-X is one of the newest DEM models; however, ASTER and SRTM are still the most used. To evaluate the qualities of these DEMs, the vertical accuracies of ASTER, STRM (all 30 m), SRTM, TanDEM-X (90 m), and SENTINEL 1 (range from 5 to 12.5 m) were tested using GPS reference points and The RMSE gave the values of ± 3.56 m ± 57.68 m, ±5.89 m, ±10.21 m and ± 20.25 m for used SRTM1, SENTINEL-1, SRTM3, TanDEM-X, and ASTER DEMs respectively. As is well known, obtaining a high-quality DEM is exceedingly challenging since it is time-consuming, expensive, and often constrained, therefore this study examined how to enhance SRTM1 as it gave the best result and assessed the effects of increasing the number of points on digital elevation model accuracy by using raster calculator and merge model in ArcGIS. The results showed that the merge model method gave the best result and, by increasing the number of reference points, the accuracy increased. The DEM produced by the enhanced SRTM (iSRTM) demonstrated noticeably better outcomes than the baseline SRTM DEM, with around 3.56 m RMSE.In this research, STRM-1 DEM is used to determine watershed basin delineation. The topographic map showed significant variations in the level of the Earth's surface, as the heights of the area ranged between 20 m and 120 m. The number of watersheds extracted in the Benban is 132 with different areas, the large area is about 72.14 km2, while the small area is about 1.13 km2, and between those areas, there are various areas. The largest recorded watershed circumference reached 48.94 km in area (72.14 km2), while the lowest recorded perimeter is 5.40 km for the area (1.13 km2). |
| first_indexed | 2024-03-09T02:16:21Z |
| format | Article |
| id | doaj.art-ecea753f9b1f4af8a997b3ab7ea428b0 |
| institution | Directory Open Access Journal |
| issn | 1110-0168 |
| language | English |
| last_indexed | 2024-03-09T02:16:21Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Alexandria Engineering Journal |
| spelling | doaj.art-ecea753f9b1f4af8a997b3ab7ea428b02023-12-07T05:27:57ZengElsevierAlexandria Engineering Journal1110-01682023-12-01844758Vertical accuracy assessment for open-source digital elevation models using GPS control points and watershed basins delineation using GISLoutfia Elsonbaty0Hossam El-Din Fawzy1Hossam Mohamed Moghazy2Gehan Rashed3Magda Hamed4Department of Geomatics Engineering, Shoubra Faculty of Engineering, Benha University, Cairo, Egypt; Corresponding authors.Faculty of Engineering, Kafr El-Sheikh University, Kafr El-Sheikh 33516, Egypt; Corresponding authors.Irrigation Engineering and Hydraulics, Faculty of Engineering, Alexandria, EgyptCivil Engineering Department, Faculty of Engineering, Kafr El-Sheikh University, Kafr El-Sheikh 33516, EgyptCivil Engineering Department, Faculty of Engineering, Kafr El-Sheikh University, Kafr El-Sheikh 33516, EgyptDigital elevation models (DEMs) are crucial for numerous assessments of the Earth's surface, so this research aim to evaluate the quality of several open source DEMs like advanced spaceborne thermal emission and reflection radiometer global DEM (ASTER GDEM), shuttle radar topography mission DEM (SRTM DEM), SENTINEL-1, and TerraSAR-X for digital elevation measurement (TanDEM-X). TanDEM-X is one of the newest DEM models; however, ASTER and SRTM are still the most used. To evaluate the qualities of these DEMs, the vertical accuracies of ASTER, STRM (all 30 m), SRTM, TanDEM-X (90 m), and SENTINEL 1 (range from 5 to 12.5 m) were tested using GPS reference points and The RMSE gave the values of ± 3.56 m ± 57.68 m, ±5.89 m, ±10.21 m and ± 20.25 m for used SRTM1, SENTINEL-1, SRTM3, TanDEM-X, and ASTER DEMs respectively. As is well known, obtaining a high-quality DEM is exceedingly challenging since it is time-consuming, expensive, and often constrained, therefore this study examined how to enhance SRTM1 as it gave the best result and assessed the effects of increasing the number of points on digital elevation model accuracy by using raster calculator and merge model in ArcGIS. The results showed that the merge model method gave the best result and, by increasing the number of reference points, the accuracy increased. The DEM produced by the enhanced SRTM (iSRTM) demonstrated noticeably better outcomes than the baseline SRTM DEM, with around 3.56 m RMSE.In this research, STRM-1 DEM is used to determine watershed basin delineation. The topographic map showed significant variations in the level of the Earth's surface, as the heights of the area ranged between 20 m and 120 m. The number of watersheds extracted in the Benban is 132 with different areas, the large area is about 72.14 km2, while the small area is about 1.13 km2, and between those areas, there are various areas. The largest recorded watershed circumference reached 48.94 km in area (72.14 km2), while the lowest recorded perimeter is 5.40 km for the area (1.13 km2).http://www.sciencedirect.com/science/article/pii/S1110016823009821Digital Elevation Model (DEM)Vertical accuracySENTINELTanDEM-XSRTMASTER |
| spellingShingle | Loutfia Elsonbaty Hossam El-Din Fawzy Hossam Mohamed Moghazy Gehan Rashed Magda Hamed Vertical accuracy assessment for open-source digital elevation models using GPS control points and watershed basins delineation using GIS Alexandria Engineering Journal Digital Elevation Model (DEM) Vertical accuracy SENTINEL TanDEM-X SRTM ASTER |
| title | Vertical accuracy assessment for open-source digital elevation models using GPS control points and watershed basins delineation using GIS |
| title_full | Vertical accuracy assessment for open-source digital elevation models using GPS control points and watershed basins delineation using GIS |
| title_fullStr | Vertical accuracy assessment for open-source digital elevation models using GPS control points and watershed basins delineation using GIS |
| title_full_unstemmed | Vertical accuracy assessment for open-source digital elevation models using GPS control points and watershed basins delineation using GIS |
| title_short | Vertical accuracy assessment for open-source digital elevation models using GPS control points and watershed basins delineation using GIS |
| title_sort | vertical accuracy assessment for open source digital elevation models using gps control points and watershed basins delineation using gis |
| topic | Digital Elevation Model (DEM) Vertical accuracy SENTINEL TanDEM-X SRTM ASTER |
| url | http://www.sciencedirect.com/science/article/pii/S1110016823009821 |
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