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This paper aims to present a new approach for mapping the eelgrass bed using the satellite data acquired from Advanced Space borne Thermal Emission and Reflection radiometer (ASTER). Yoshina Area was chosen as the study site due to its well-known habitat of eelgrass in Hiroshima prefecture. In order to evaluate vegetated areas, the Normalized Difference Vegetation Indices (NDVI) of several points was calculated, and then applied the relative atmospheric correction. The spectral reflectance of fresh and dead leaves along with different species of eelgrass was also confirmed. Finally the bottom index between 2 bands was calculated and the distribution maps were derived. NDVI alone is unable to extract eelgrass. For the extinction coefficient ratio, a good correlation between each band is found (0.86-0.98) and its values varied from 0.650.96 for band 1 and 2. The study also provides conclusive evidence that the eelgrass mapping is accurately confirmed with the field research, though differs with the season.

EELGRASS BED MONITORING USING SATELLITE TERRA/ASTER DATA IN YOSHINA TIDAL FLAT