New Delhi. The PSINSAR satellite technology used to observe the gradual sinking of Joshimath city in Uttarakhand is a powerful remote sensing system capable of measuring and monitoring displacements in the Earth’s surface over time. This week, the Punjab-based Indian Institute of Technology (IIT)-Ropar said its researchers had predicted a massive landslide in Joshimath in 2021.
IIT Ropar said in a statement that the forecast was between 7.5 and 10 cm of displacement for buildings in Joshimath, which is enough to cause massive cracks in the buildings. The researchers collected remote sensing data using Persistent Scatterer Interferometry Synthetic Aperture Radar (PSINSAR) technique to observe the subsidence.
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This is how technology works
Synthetic aperture radar (SAR) is a form of radar used to produce two-dimensional images or three-dimensional reconstructions of objects, such as landscapes. Reet Kamal Tiwari, assistant professor in the Department of Civil and Environmental Engineering, IIT-Ropar, told PTI-language, ‘A signal from the SAR satellite interacts with various targets and goes back to the sensor located in the satellite, based on which an image is formed. is created. In our study, Sentinel 1 SAR satellite data was used.
The IIT-Ropar team was investigating the surface displacement of Tapovan, a tourist destination near Joshimath, after the February 2021 floods, when it observed that Joshimath was undergoing a surface displacement of up to 8.5 cm, which was upward.
Tiwari’s then PhD student Akshar Tripathi said, ‘Because we were working in the same area, but for studying rock displacement as a result of flash floods, we used the PSINSAR technique to study the displacement of buildings over time. Thought about the use of.
Tags: Joshimath, Uttarakhand news
FIRST PUBLISHED : January 13, 2023, 22:01 IST