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引用本文:夏晓瑞,韦玉春,徐宁,袁兆杰,王沛.基于决策树的Landsat TM/ETM+图像中太湖蓝藻水华信息提取.湖泊科学,2014,26(6):907-915. DOI:10.18307/2014.0613
XIA Xiaorui,WEI Yuchun,XU Ning,YUAN Zhaojie,WANG Pei.Decision tree model of extracting blue-green algal blooms information based on Landsat TM/ETM+imagery in Lake Taihu. J. Lake Sci.2014,26(6):907-915. DOI:10.18307/2014.0613
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基于决策树的Landsat TM/ETM+图像中太湖蓝藻水华信息提取
夏晓瑞1, 韦玉春1, 徐宁2, 袁兆杰1, 王沛1
1.南京师范大学虚拟地理环境教育部重点实验室, 南京 210023;2.水利部海河水利委员会水资源保护科学研究所, 天津 300170
摘要:
以9期Landsat TM/ETM+影像为数据源,基于K-T变换和归一化植被指数(NDVI),建立了湖泊蓝藻水华信息提取的决策树模型.基于大气顶面反射率图像,选用2005年10月17日太湖图像进行了对比验证,表明决策树模型比单波段阈值法、多波段阈值法(RVI、DVI、NDVI)能够更有效地提取蓝藻水华信息,区分陆生植被、水生植物和水华,省去了水体掩膜的过程.使用太湖2002年10月25日和2011年7月22日图像、巢湖2005年8月12日的图像,验证决策树模型方法和工作流程的有效性.使用多期TM图像确定了阈值的取值范围,其中,亮度、绿度、NDVI的下限值依次为0.191、-0.007、-0.054,湿度下限范围为0.07~0.15;亮度阈值上限范围为0.3~0.7、绿度为0.2~0.5、湿度为0.1~0.3,这些结果可作为湖泊蓝藻水华遥感监测的参考.
关键词:  蓝藻水华  太湖  Landsat TM/ETM+影像  K-T变换  决策树  遥感信息提取
DOI:10.18307/2014.0613
分类号:
基金项目:国家自然科学基金项目(40771152)和江苏省普通高校自然科学研究计划项目(09KJA420001)联合资助
Decision tree model of extracting blue-green algal blooms information based on Landsat TM/ETM+imagery in Lake Taihu
XIA Xiaorui1, WEI Yuchun1, XU Ning2, YUAN Zhaojie1, WANG Pei1
1.Key Lab of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210023, P.R.China;2.Research Institute of Water Resources Protection, Haihe Water Conservancy Committee, Tianjin 300170, P.R.China
Abstract:
A decision tree model (KTNI) based on the K-T transformation and Normalized Difference Vegetation Index (NDVI) was developed to extract the blue-green algal blooms information in the lakes using 9 Landsat TM/ETM+images. This paper compared the KTNI with the single-band threshold value method and the multi-band threshold value methods (RVI, DVI, NDVI) in accuracy of extracting the blue-green algal blooms information, and then validated the KTNI using two observed images of the Lake Taihu and one image of the Lake Chaohu. The results showed that the KTNI can mask the water body automatically and separate the blue-green algal blooms from the land vegetation and aquatic plants effectively. Model thresholds and their ranges were determined based on the TM images;the lower limits of the Brightness, Greenness and NDVI were 0.191, -0.007 and -0.054, respectively, and Wetness ranged from 0.07 to 0.15. For the upper limits, the Brightness was from 0.3 to 0.7, Greenness was from 0.2 to 0.5, and Wetness was from 0.1 to 0.3. The decision tree model and threshold values can be used as the reference for remote sensing monitoring on the blue-green algal blooms in lakes.
Key words:  Blue-green algal blooms  Lake Taihu  Landsat TM/ETM+image  K-T transformation  decision tree  remote sensing information extraction
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