Figure 1. Multiple expression for two mangrove forests (above: Fukido-gawa River, Ishigaki Is. And below: Nakama-gawa River, Iriomote Is.) (arranged Kanetomi M. et al. ,1998)

3. Results and discussion
It was easy to make black pixels as the mask for each sub-compartment by utilization of suitable application software for painting, smearing and drawing after overlay sub-compartment map to an imagery of remote sensing data. Although this procedure was done by hand works here, it was considered that program was not so complicate to make the mask automatically. The procedure to make masks and masks for 4 sub-compartments of mangrove forest in the mouth of Fukido-gawa River, were shown in Figure 2. The data sets were obtained by overlaying each


Figure 2. Boundaries of sub-compartments for two mangrove forests and process to make masks for each sub-compartment of Fukido-gawa River