Analyses of ASTER and Spectroradiometer Data with in Situ Measurements for Turbidity and Transparency Study of Lake Abashiri

要旨

Remotely sensed and spectroradiometer (Multi-spectroradiometer MSR-7000) data have often been used to simulate and develop water quality model. This paper describes about the techniques to develop water quality models for turbidity and Secchi disk transparency of Lake Abashiri by using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) 1B and field spectroradiometer data with fluorometer data. The ASTER data were correlated with lake truth measurements after reducing the atmospheric effects of ASTER level 1B data by using two different models: (i) Proposed model in this study and (ii) Internal Average Relative Reflectance (IARR) model in model maker of ERDAS imagine software. Therefore, turbidity maps of Lake Abashiri with Okhotsk Seashore for 26 September 2001 and 16 September 2003 were produced from the ASTER level 1B data with lake truth measurements by using above mentioned models. Hence, the differences between the turbidity maps for 26 September 2001 and 16 September 2003, which were developed by different models, were comprehended. The result indicated significant linear relationships among the band ratio algorithms of band1 and band2 of ASTER data with in situ turbidity for 26 September 2001 (r=0.943 and 0.942) and 16 September 2003 (r=0.766 and 0.780) for two different methods. Spectroradiometer data