MAPPING AND ESTIMATION OF WATER SPREAD AREA IN MANAMELKUDI BLOCK OF PUDUKKOTTAI DISTRICT USING SENTINEL-1A DATAD. Pandiya Kumar, Balaji Kannan, S. Panneerselvam, R. Kumaraperumal, S. Pazhanivelan, K.P. Ragunath, N.S. Sudarmanian and M. Venkatesan
A research study was conducted for mapping and estimation of water spread area using Sentinel-1A satellite data in Manamelkudi block of Pudukkottai district. The most important aspect of water resource planning and management is mapping and regular monitoring of surface water bodies. Remote sensing has become most widely used method for measuring and monitoring of waterbody dynamics due its temporal and spatial availability. European Space Agencyâs Sentinel-1A data provides high quality SAR data which is used widely used for its ability to penetrate through clouds and illumination independence. The acquired satellite data is processed using SNAP Software. The Water spread area was derived from the processed data using Thresholding approach. The back-scattering values generated through pre-processing in decibel ranges from -7.072 to -29.39 for August 2020 (Pre-Monsoon), -6.189 to -26.634 for December 2020 (Post-Monsoon) and -7.582 to -30.387 for April 2021(Summer). The water spread area in selected 15 Tanks were 52.461 ha, 386.74 ha and 299.41 ha on 17th August 2020, 15th December 2020 and 14th April 2021 respectively.