Abstract
Abstract. Urbanization increases the pressure on land and ground water. Due to pressure on land and over extraction of the ground water for modernization and development, deformation of land increase. The traditional deformation monitoring techniques are costly and time taking. The Differential Interferometry Technique (DInSAR) has capability to monitor regional scale deformation. Recently Vasundra region of the NCR has experienced a road subsidence near to the multiple stories building. In the study we have attempted to identify the Vasundra and nearby region by the DInSAR technology to identify the deformation in Delhi and NCR focused on the Vasundra area of Ghaziabad, Uttar Pradesh, India. This is one of the developed and planned area in the Ghaziabad District. The Sentinel-1 C data has been used to monitor the deformation in that area. The Vasundra area has been deformed due to heavy rainfall and water logging in the surrounding area by which the road has been subsided up to 30 feet. Using the sentinel data we were able to identify the subsidence in Vasundra and nearby areas. Since the Sentinel scene was very big so a clear picture of the deformation indication in the NCR region are found which need more in-depth study further. Conclusively it can be said that DInSAR technique with Microwave data is a competent tool to monitor the minute deformation.
Highlights
This research focuses on space borne SAR imagery for monitoring surface deformation in urban area
The results described aim to monitor the surface deformation in the urban and developed region of National capital region (NCR) of India by focusing on Vasundra, Ghaziabad, India using Cband data of Sentinel-1 displayed in figure 3
The products derived with the help of the data pair interferometric wide (IW) single look complex (SLC) Sentinel-1 images, spanning the period from 14th July 2018 to 26th July 2018 for surface deformation map
Summary
This research focuses on space borne SAR imagery for monitoring surface deformation in urban area. Interferometry SAR (InSAR) (Aydoner, Maktav, and Alparslan 2004) techniques are widely used to measure the topographic profile (Bürgman, Rosen, and Fielding 2000) and surface deformations (Ishwar and Kumar 2017)(Fulton point location in an area. Though these methods are timeconsuming, require more man power and costly, they can measure height information at millimeter to centimeter levels of accuracy on local area level (Cao et al 2007). Differential SAR-Interferometry (D-InSAR) is one of the competent technique use to identify the land surface horizontal motion and land subsidence (Ishwar and Kumar 2017)(Strozzi et al 2001)(Bhattarai et al 2017; Caló et al 2017; Champati, Head, and Studies 2001; Chang, Ge, and Rizos 2005) over a large area at low cost than the traditional techniques (Ng et al 2011) (Ferretti, Prati, and Rocca 2001).The precise leveling, total station and global navigation satellite system (GNSS) are common ground-based traditional measurement techniques which are used to monitor the subsidence at a pin
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