CORAL REEF MAPPING WITH REMOTE SENSING DATA

将波长400nm-1050nm分为17步，测量了23种物体的光谱反射率。这些数据是在冲绳县石垣岛东南海岸使用便携式光谱反射计测量的。这些物体是海滩和泻湖沉积物和陆源沉积物，活珊瑚和死珊瑚，如Acropora sp.和Poritessp.。比如绿藻、红藻和褐藻。这个物体从海面上测量岸上和水下。光谱反射率测量的结果概要如下：岸上的活珊瑚和死珊瑚可以区分，绿藻、红藻和褐藻可以相互区分。然而，在水下的情况下，很难区分两者。然而，在水下的情况下很难区分这些。由于光谱反射率高于藻类和海草，因此在水中可以区分活珊瑚和死珊瑚。此外，利用光谱反射率可以区分各种沉积物，如珊瑚砂和陆源沉积物。

The spectral reflectance was measured 23 kinds of object by dividing the wave length of 400nm-1050nm into 17 steps. These data were measured in the south eastern coast of the Ishigaki-Island, Okinawa Pref.using a portable spectro reflectometer. These objects were beach and lagoon sediments and terrigenous sediments, live and dead coral such as Acropora sp.and Poritessp., green algae, red algae and brown algae. The object measured both on the shore and the underwater from the sea surface. The outline of the result about measurement of spectral reflectance is as follows : Measures on shore live coral and dead coral can be distinguished, and green algae, red algae and brown algae can be mutually distinguished. However, it is difficult to distinguish both of them in case of being under water.However it is difficult to distinguish these in case of being under water. Because spectral reflectance is higher than algae and seagrasses, live and dead coral can be distinguished from there in water. And moreover, various sediments for instance, coral sand and terrigenous sediments can be distinguished by using spectral reflectance in water.