摘要湿地不止是自然界不可或缺的环境资源之一,也是自然界生物多样性十分丰富和极具生产活力的生态系统。湿地的水陆过渡性决定了它对自然环境多方面的反馈特性,它在生态环境保护和维护生态平衡、保持生物的多样性、防御洪水、调节径流、涵养水源、稳定海岸线、调节城市气候等方面都起着极其重要的作用。本次研究在总结前人所用方法的基础上,针对浙江省的湿地系统采用2011年Landsat TM影像数据利用改进的MNDWI设定阈值法进行湿地水体信息的提取,结果显示所提取的湿地水域面积为3393.62平方公里,通过与两种参考数据对比,得到提取的精度分别为60.52%和47.9%。虽然提取精度不高,但也作为湿地水域面积的“准真值”,为整个研究区湿地水域面积的修正提供依据。61596
毕业论文关键词:湿地;水域面积提取;MNDWI; 阈值法; TM影像
Abstract Wetlands not only one of the indispensable nature of environmental resources, nature is very rich in biopersity and produce highly dynamic ecosystem. Wetlands amphibious transitional determines its natural environment, a wide range of feedback feature, which eco-environmental protection and maintaining ecological balance, maintaining biopersity, flood defense, regulating runoff, water conservation, shoreline stability, regulating climate and other aspects of the city They play an extremely important role. The study summarizes the basis of previous methods used, the extraction of wetland water information for wetland system in Zhejiang Province adopted in 2011 on Landsat TM data using improved MNDWI set threshold, showed that the extracted wetland water area 3393.62 square kilometers, by comparison with different reference data, the accuracy of the extraction were 60.52% and 47.9%. Although the extraction accuracy is not high, but also as a wetland water area of "quasi-true value", provide the basis for the entire correction of wetland water area.
Keywords: wetlands; Water area extraction; MNDWI; Threshold; TM image
摘要 2
Abstract 3
1. 引言 5
1.1 研究意义 5
1.3 研究的内容和思路 6
1.4 论文框架 6
2. 研究区域和数据 7
2.1 研究区域 7
2.1.1 研究区位置 7
2.1.2 研究区的主要湿地类型及分布 8
2.1.3 研究区自然概况 9
2.2 研究数据 11
3. 遥感湿地水体信息提取原理 12
3.1 遥感识别地物原理 12
3.2 湿地水体信息提取 12
4. 湿地水体信息提取方法 13
4.1 技术路线 13
4.2 湿地水体信息提取方法流程 14
4.2.1 数据预处理 14
4.2.2 波段选择 14
4.2.3归一化差异水体指数的构建 15
4.2.4改进的归一化差异水体指数(MNDWI)的产生 15
5. 结果与讨论 16
5.1 结果 16