中文摘要：

珊焊是一个 sensitive-to-environment 建筑群水兵生态系统。珊瑚的 Theecosystem 富于生物多样性。遥感为分类珊焊提供一个强大的工具并且是大多数费用 - 有效途径为大 - 规模礁石调查。DongshaAtoll，有 10 m 的平均深度的超过 300 km~2，在华南海的北大陆人边缘被定位。它被在最近的十年期间的破坏钓鱼滥用了。三卫星形象(Quickbird2， ETM + 和 SPOT5 ) 被用来评估能力 ofSPOT5 形象提供为在那里分类珊焊的当前的分发是有用的数据。在处理的数据期间，无指导的分类功能为 ETM+ 和 SPOT5 数据被采用，当监督分类方法被用于 Quickbird2 时。班是() 合并了进珊焊，然后将被 vectorization，简化，和拓扑的分析操作。有比有 3 x 3pixels 在的察觉限制的 100 m 大的 1 331 珊焊多 - Quickbird2 的乐队数据，它作为比较基线被拿。从 SPOT5 和 ETM 图象提取的 Theresults 比从 theQuickbird2 图象的那些是在数字和区域的更少，而从 SPOT5 数据的结果由于它的更高的分辨率比在淤泥的泻湖的 ETM 数据的那些好。因为它的差的穿入能力， SPOT5 x 乐队 2 没能与 ETM 数据相比在环礁内区分深底层。仅仅看到 x 乐队 1cannot 被用来把珊焊区分开来与沙底部。多合并 SPOT5 - 有 SPOT5 平底锅的空间分辨率的乐队数据 - 数据并且指 ETM 形象被期望提供一颗最佳的卫星 - 为珊焊印射的基于的途径。

英文摘要：

Coral reefs are an sensitive-to-environment complex marine ecosystem. The ecosystem of corals is rich in biodiversity. Remote sensing offers a powerful tool for categorizing coral reefs and is the most cost - effective approach for the large - scale reef survey. The Dongsha Atoll, more than 300 km2 with an average depth of 10 m, is located at the northern continental margin of the South China Sea. It has been abused by destructive fishing during recent decades. Three satellite imageries （Quickbird2, ETM ＋ and SPOTS） are used to evaluate the capabilities of SPOT5 imagery to provide data that are useful for categorizing the current distribution of coral reefs therein. During the data processing, unsupervised classification functions are adopted for ETM ＋ and SPOT5 data, while the supervised classification method is used for Quickbird2. The classes are （or not） merged into coral reef, and then will be operated by vectorization, simplification, and topological analysis. There are 1 331 coral reefs larger than 100 m2 with a detection limit of 3 × 3 pixels at the multi - band data of Quickbird2, which is taken as the comparison baseline. The results extracted from SPOT5 and ETM images are less in number and area than those from the Quickbird2 image, whereas the results from SPOT5 data are better than those of ETM data at the silty lagoon due to its higher resolution. SPOT5 XS band 2 fails to distinguish the deep substrate inside the atoll compared with ETM data because of its poor penetration capability. Only SPOT XS band 1 cannot be used to differentiate coral reef from sand bottom. Merging the SPOT5 multi - bands data with the spatial resolution of SPOT5 pan - data and referring to ETM imagery are expected to provide an optimal satellite - based approach for mapping of coral reefs.