Mapping of marine Chlorophyll-a and suspended solid concentration using OCM-2 sensor | |
| Author | Viswanath, Sureddy Venkata Kasi |
| Call Number | AIT Thesis no.RS-16-11 |
| Subject(s) | Mapping Sensors Marine Chlorophyll-a Suspended--Solid--Concentration |
| Note | A thesis submitted in partial fulfilmentof the requirements for the degree of Master of Engineering in Remote Sensing and Geographic Information Systems |
| Publisher | Asian Institute of Technology |
| Abstract | Oceans are the main source for the human life on the earth and covers over three portions of earth surface and the remaining one section is occupied by land. Many parts of deep oceans contain phytoplankton which intake carbon-dioxide and release oxygen which is helpful for fisheries and other living beings. Chlorophyll-a (Chl-a) and Suspended Solids (SS) concentration shows the productivity of water and their surrounding environment. This can be effectively estimated through several remote sensing techniques. From the study on gulf of Thailand, Chl-a and SSC are increasing in coastal areas due to changing environment caused by variations in global carbon cycle, climate change and water pollution linking with existing social problems such as high population density and rapid urbanization at coast areas has critical impact. In this project evaluating various models for Marine Chlorophyll-a and Suspended Solid mapping by employing OCM-2 data of Oceansat-2 satellite for Northern Gulf of Thailand. The retrieval of chlorophyll-a and suspended solid concentration by the atmospheric correction of visible bands from 400nm-700nm to attain normalized water leaving radiances and then a suitable algorithm is applied. The in-situ reflectance values of sea waters are measured using spectrometer. The reflectance values of spectrometer are correlated with the same day atmospherically corrected satellite reflectance and the analysis gives high correlation of R20.73. By using the suitable algorithms, Chl-a and SSC are estimated and correlated with observed Chl-a and SSC. This analysis gives more correlation of R20.86 and 0.85 respectively with the modified algorithms of Chl-a and SSC. From the GAM and Correlation analysis Chl-a and SSC has maintained a moderate positive correlation while SSC and SST has negative correlation. The other variables has no relationship with Chl-a and SSC. The rate of Chl-a concentration and SSC decrease with the increase in distance from the coast-line. From the future trend analysis of Chl-a and SSC, variation of change is non-linear and uncertain with the variables. In the 20 year pattern most of Coastal areas are under high concentration level of Chl-a and SSC. The present study helps in understanding the amounts and dispersal patterns of the chlorophyll-a and suspended solids in the coastal waters of Gulf if the trend is continued for future, which in turn will help in coastal zone management. This study also helps for the fisherman, studies on coastal activities regarding marine pollution and also for the researchers on marine environment. |
| Year | 2016 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Remote Sensing (RS) |
| Chairperson(s) | Tripathi, Nitin Kumar; |
| Examination Committee(s) | Salin, K. R.;Sarawut Ninsawat;Raju, Durairaju Kumaran |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2016 |