干旱区生态环境知识资源中心(Arid): Assessing the Accuracy of ALOS/PALSAR-2 and Sentinel-1 Radar Images in Estimating the Land Subsidence of Coastal Areas: A Case Study in Alexandria City, Egypt

Arid

DOI	10.3390/rs13091838
	Assessing the Accuracy of ALOS/PALSAR-2 and Sentinel-1 Radar Images in Estimating the Land Subsidence of Coastal Areas: A Case Study in Alexandria City, Egypt
	Darwish, Noura; Kaiser, Mona; Koch, Magaly; Gaber, Ahmed
通讯作者	Gaber, A (corresponding author), Port Said Univ, Fac Sci, Geol Dept, Port Said 42522, Egypt.
来源期刊	REMOTE SENSING
EISSN	2072-4292
出版年	2021
卷号	13 期号:9
英文摘要	Recently, the Differential Interferometric Synthetic Aperture Radar (DInSAR) technique is widely used for quantifying the land surface deformation, which is very important to assess the potential impact on social and economic activities. Radar satellites operate in different wavelengths and each provides different levels of vertical displacement accuracy. In this study, the accuracies of Sentinel-1 (C-band) and ALOS/PALSAR-2 (L-band) were investigated in terms of estimating the land subsidence rate along the study area of Alexandria City, Egypt. A total of nine Sentinel-1 and 11 ALOS/PALSAR-2 scenes were used for such assessment. The small baseline subset (SBAS) processing scheme, which detects the land deformation with a high spatial and temporal coverage, was performed. The results show that the threshold coherence values of the generated interferograms from ALOS-2 data are highly concentrated between 0.2 and 0.3, while a higher threshold value of 0.4 shows no coherent pixels for about 80% of Alexandria's urban area. However, the coherence values of Sentinel-1 interferograms ranged between 0.3 and 1, with most of the urban area in Alexandria showing coherent pixels at a 0.4 value. In addition, both data types produced different residual topography values of almost 0 m with a standard deviation of 13.5 m for Sentinel-1 and -20.5 m with a standard deviation of 33.24 m for ALOS-2 using the same digital elevation model (DEM) and wavelet number. Consequently, the final deformation was estimated using high coherent pixels with a threshold of 0.4 for Sentinel-1, which is comparable to a threshold of about 0.8 when using ALOS-2 data. The cumulative vertical displacement along the study area from 2017 to 2020 reached -60 mm with an average of -12.5 mm and mean displacement rate of -1.73 mm/year. Accordingly, the Alexandrian coastal plain and city center are found to be relatively stable, with land subsidence rates ranging from 0 to -5 mm/year. The maximum subsidence rate reached -20 mm/year and was found along the boundary of Mariout Lakes and former Abu Qir Lagoon. Finally, the affected buildings recorded during the field survey were plotted on the final land subsidence maps and show high consistency with the DInSAR results. For future developmental urban plans in Alexandria City, it is recommended to expand towards the western desert fringes instead of the south where the present-day ground lies on top of the former wetland areas.
英文关键词	Sentinel-1 ALOS PALSAR-2 land subsidence accuracy assessment Alexandria City Egypt
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000650749300001
WOS关键词	SLOW-MOVING LANDSLIDES ; SEA-LEVEL RISE ; NILE DELTA ; SURFACE DEFORMATION ; PERMANENT SCATTERERS ; SAR INTERFEROMETRY ; DINSAR TECHNIQUE ; TIME-SERIES ; INTERFEROGRAMS ; LOUISIANA
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351525
作者单位	[Darwish, Noura; Kaiser, Mona] Suez Canal Univ, Fac Sci, Geol Dept, Ismailia 41522, Egypt; [Koch, Magaly] Boston Univ, Ctr Remote Sensing, Boston, MA 02215 USA; [Gaber, Ahmed] Port Said Univ, Fac Sci, Geol Dept, Port Said 42522, Egypt
推荐引用方式 GB/T 7714	Darwish, Noura,Kaiser, Mona,Koch, Magaly,et al. Assessing the Accuracy of ALOS/PALSAR-2 and Sentinel-1 Radar Images in Estimating the Land Subsidence of Coastal Areas: A Case Study in Alexandria City, Egypt[J],2021,13(9).
APA	Darwish, Noura,Kaiser, Mona,Koch, Magaly,&Gaber, Ahmed.(2021).Assessing the Accuracy of ALOS/PALSAR-2 and Sentinel-1 Radar Images in Estimating the Land Subsidence of Coastal Areas: A Case Study in Alexandria City, Egypt.REMOTE SENSING,13(9).
MLA	Darwish, Noura,et al."Assessing the Accuracy of ALOS/PALSAR-2 and Sentinel-1 Radar Images in Estimating the Land Subsidence of Coastal Areas: A Case Study in Alexandria City, Egypt".REMOTE SENSING 13.9(2021).