Object-based image analysis for mapping geomorphic zones of coral reefs in the Xisha Islands, China

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• 作者：Jingping Xu ; Jianhua Zhao ; Fang Li ; Lin Wang ; Derui Song…
• 关键词：Key wordsobject ; based ; Landsat 8 ; geomorphic mapping ; Xisha Islands
• 刊名：Acta Oceanologica Sinica
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：35
• 期：12
• 页码：19-27
• 全文大小：
• 刊物主题：Oceanography; Climatology; Ecology; Engineering Fluid Dynamics; Marine & Freshwater Sciences; Environmental Chemistry;
• 出版者：The Chinese Society of Oceanography
• ISSN：1869-1099
• 卷排序：35

文摘

Mapping regional spatial patterns of coral reef geomorphology provides the primary information to understand the constructive processes in the reef ecosystem. However, this work is challenged by the pixel-based image classification method for its comparatively low accuracy. In this paper, an object-based image analysis (OBIA) method was presented to map intra-reef geomorphology of coral reefs in the Xisha Islands, China using Landsat 8 satellite imagery. Following the work of the Millennium Coral Reef Mapping Project, a regional reef class hierarchy with ten geomorphic classes was first defined. Then, incorporating the hierarchical concept and integrating the spectral and additional spatial information such as context, shape and contextual relationships, a large-scale geomorphic map was produced by OBIA with accuracies generally more than 80%. Although the robustness of OBIA has been validated in the applications of coral reef mapping from individual reefs to reef system in this paper, further work is still required to improve its transferability.