Ground deformation measuring of the Orbetello coastal plain (Central Italy) using time series InSAR | |
| Author | Venkatadripathi, Pattela Taraka |
| Call Number | AIT Thesis no.RS-18-24 |
| Subject(s) | Synthetic aperture radar Global Positioning System Subsidences (Earth movements) |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Remote Sensing and Geographic Information System, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | InSAR is a state of art technology to measure ground deformation form several hundred kilometers above the ground using satellites equipped with Radar. Classical Interferometry helps in measuring deformation in em level and by using MTInSAR ground deformation can be measured to millimeter level scale. In this research, Classical InSAR and Time Series MTInSAR was used to measure the seasonal and long-term trends in the Orbetello Coastal Plain in Central Italy from October 2016 to July 2018. Due to civilian and Industrial activities, groundwater extraction rates are very high causing ground deformations in Orbetello region. From the field stations ground deformation measured is from -20 to +20 mm1year. These deformation rates are seasonal where Uplift in winter and Subsidence in Summer along with the long-term trend. By using classical InSAR deformation rates both seasonal and long-term trends are not seen due to decorrelation of interferometric phase due to change in coherence, geometry, and presence of Noise and atmosphere related to topography in the interferograms. By using MTInSAR noise was reduced and geometric errors, orbital errors were removed thus MTInSAR was able to measure the long-term ground deformation but the seasonal signal was not observed by MTInSAR. For this research two software StaMPS and SARPROZ were used to produce PS time series. Both the systems were tested among each other to check which one performed well in a rural area as most part of the land cover in the study area is cropland. PS StaMPS measured LOS velocity rate ranging from - 13.5 to 16.8 mm1year and PS SARPROZ measured LOS velocity -8 to 8 mm1year. Stamps results are more accurate when compared with PS produced by SARPROZ. The outcomes of this research may help in measuring the ground deformation in Orbetello planes in central Italy with millimeter- level precision which is related to groundwater extraction. |
| Year | 2018 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Remote Sensing (RS) |
| Chairperson(s) | Virdis, Salvatore G. P. |
| Examination Committee(s) | Tripathi, Nitin Kumar ;Pham, Huy Giao |
| Scholarship Donor(s) | AIT Fellowship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2018 |