A basic experiment for mapping of eelgrass distribution using the balloon with the simple spectral camera in this research was conducted. The field survey station was selected to the Yoshina Tidal Flat in Takehara, Hiroshima Prefecture. As a result, the following matters were clarified. 1) The characteristic for the spectral reflectance of the eelgrass appears in the wavelength at 450nm, 500nm, 650nm, and 700nm<. 2) A strong correlation was observed the relationship between the reflectance ratio (533nm and 440nm; 533nm and 620nm; 620nm and 720nm) and the area ratio (index of the density).3) The width of the observation and the spatial resolution of the balloon were provisionally calculated as 17m and 13mm. 4) Strength of the balloon rope used was measured with about 1000N. 5) The infrared composite color image of the eelgrass taken with the simple spectrum camera was clearer than the natural color composite image.
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