Relationships Between TM Data of Landsat 5 and Stand Parameters on Mangrove Forest in Okinawa.
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概要
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The dominant species are <I>Rhizophora stylosa</I> Griff. and <I>Bruguiera gymnorrhiza</I> (L.) Lamk 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 <I>R. stylosa</I> and stand density for mangrove forests was carried out at fourteen plots in Ishigaki Island and Iriomote Island. A matrix of correlation coefficient among these stand parameters and CCT count of each band of Thematic Mapper (TM) data of Landsat 5 was obtained.<BR>For band 1, 2 and 3, the correlation coefficients were not so high although negative correlation was found among each mean CCT count and the mean for five parameters to express the size or volume of a tree.<BR>For band 4, there was significantly high correlation among the mean of same parameters mentioned above and mean CCT count, and negative correlation was found for the mixture ratio of <I>R. stylosa</I> and stand density.<BR>For band 5, the similar correlation among the parameters and CCT count was regarded as apparent correlation although slightly high correlation coefficients were obtained. In this area, it is observed that <I>R. stylosa</I> is a dominant species on the seaward side and <I>B. gymnorrhiza</I> is a dominant on the landward side in the typical natural mangrove forest. <I>R. stylosa</I> is a kind of pioneer and <I>B. gymnorrhiza</I> is a maxmum species, so the former forms relatively young and poor stand and the latter does old and rich stand. The other hand, the seaward stand on the low level sediments shows small value of CCT count and the landward stand on the high level sediments does larger value. It was considered that this correspondence was a reason of the apparent correlation. Although the stand parameters had not significantly high correlation with the data of this band, correlation coefficients were risen with separation of the data between two islands. One reason of this matter is considered that the tide in Iriomote Island was lower 9 cm for the level above the mean sea level than Ishigaki Island.<BR>For band 7, any correlation was not found among the parameters and the CCT count.<BR>It was made clear that good estimations of mangrove forest stand parameters were possible with CCT count of band 4. For the general estimation, it is remained to normalize CCT counts of this band with location, season and observation time.
- 社団法人 日本写真測量学会の論文
社団法人 日本写真測量学会 | 論文
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