期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2010
卷号：XXXVIII - Part 8
页码：534-537
出版社：Copernicus Publications
摘要：Coral reefs are declining worldwide because of various factors. The necessity of marine biodiversity conservation through establishment and management of marine protected areas (MPAs) is being recognized globally. Japan has a policy to cooperate to develop an important MPAs network in the Asia and Oceania region. In this study, as part of the work of the Japanese Ministry of the Environment, the latest coral reef maps of East Asia, Micronesia and Melanesia regions have been developed by mainly using ALOS AVNIR-2 imagery. About 1,500 scenes of less cloudy satellite imagery were used to detect coral reefs. As pre-processing, the map projections of all scenes were transformed to the geographical latitude and longitude coordinate system and also the land areas, deep sea areas, and cloudy areas were masked to prevent degradation of classification accuracy. The shallow sea areas where coral reefs are expected were clustered to 10 classes by the ISODATA algorithm and aggregated to the six categories: coral cover 5 to 50%, coral cover 50 to 100%, seaweed/seagrass, sand bottom, mud bottom, and rock. After verification, the maps were transformed from raster to vector data format for easy handling on GIS software
