Conference Papers
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Item Water level retrieval and water body mapping: A case study of nagarjuna sagar reservoir(Springer Science and Business Media Deutschland GmbH, 2021) Nalluri, N.; Ramesh, H.Satellite radar altimetry is exclusively designed for the oceanographic studies such as wind speed, sea surface level, tide height, and volumetric changes. In spite of the fact that the satellite radar altimetry is predominantly intended for oceanographic studies and ice sheet monitoring these days, the utilization of altimetry information is reached out to think about water dimension of inland water bodies like reservoirs, rivers and so on. This study covers the use of SENTINEL-3 Ku/C Radar Altimeter (SRAL) for the monitoring water level of Nagarjuna Sagar reservoir located in Telangana state, India. Satellite altimetry works on the principle of range measurement that is the measure of the travel time of microwave pulse from emission to receiving which is interrupted by many atmospheric conditions which cause a disturbance in travel time of microwave pulse which is to be adjusted to get corrected depth of water level. The SRAL information is handled utilizing Broadview Radar Altimetry Toolbox (BRAT) programming. The consistency of derived water level is compared using field data, and all the depths are within error range of one meter. Water body mapping is carried out utilizing cloud-free data of Landsat-8 from January 2016 to March 2019 which showed a gradual decrease in water level from November to May. © Springer Nature Singapore Pte Ltd 2021.Item Restoring Wet Troposhere Data in Retrieving Water Level from Minor Track of SRAL Over Srisailam Reservoir, India(Institute of Electrical and Electronics Engineers Inc., 2023) Nalluri, A.; Ramesh, H.Satellite altimetry has made significant studies in recent times and is now proving to be a highly effective tool for monitoring inland water bodies. Srisailam Reservoir, a crucial multipurpose reservoir situated on the Krishna River in India, is of particular interest. The Sentinel-3A (S3A) satellite, equipped with SRAL (Synthetic Aperture Radar Altimeter) incorporating $K_{\mathbf{u}}$ and C-bands, assists in accurately recording range values and conducting atmospheric corrections. The S3A includes two pass tracks over this reservoir, with the main pass situated close to the dam site, effectively covering a significant portion of the footprints. This main pass has exhibited successful results with minimal error, as documented in the DAHITI database. This study centres on retrieving water levels from a minor track located at a considerable distance from the major track. The methodology outline involves calculating water levels by subtracting the range and associated corrections from the altitude in relation to the mean sea level (MSL). Among the various atmospheric distortions, wet tropospheric correction (WTC) stands as a major concern due to the impact of moisture in the path of the atmospheric signal. Individual analysis of WTC is carried out to overcome data loss. With this implementation, this study achieved WL retrieval with successful data retrieval. The correlation error between retrieved WL and Filed WL (Central Water Commission of India) is quantified as 0.98. © 2023 IEEE.