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The dominant species are Rhizophora stylosa and Bruguiera gymnorrhiza in the mangrove forest in Okinawa. Measurement of seven stand parameters, tree hight, diameter at breast hight, stem volume , crown area, stand volume, mixture ratio of R. stylosa and stand density for mangrove forest was carried out at fourteen plots in Ishigaki Island and Iriomote Island. Correlation coefficients between seven stand parameters and many ratios and indexes calculated from TM data of Landsat 5 at fourteen sample plots, were obtained and arranged in Table 2. Significantly high correlation was recognized between stand parameters and some ratios and indexes . Relationships between these ratios and indexes, sand parameters might be linear or curvilinear. So it was considered that some ratios and indexes were useful to estimate stand parameters for mangrove forest in Okinawa.

Relationships between Calculated Indexes from TM Data of Landsat 5 and Stand Parameters on Mangrove Forest in Okinawa.