1997 Fiscal Year Final Research Report Summary

CORAL REEF MAPPING WITH REMOTE SENSING DATA

Research Project

Project/Area Number	08680618
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	環境保全
Research Institution	KOKUSHIKAN UNIVERSITY
Principal Investigator	HASEGAWA Hitoshi Associate Professor, Department of Geography, Kokushikan University, 文学部・地理学専攻, 助教授 (80208496)
Project Period (FY)	1996 – 1997
Keywords	CORAL REEF / REMOTE SENSING / SPECTRAL REFLECTANCE
Research Abstract	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.