Prediction of chlorophyll a concentration using HJ-1 satellite imagery for Xiangxi Bay in Three Gorges Reservoir

Since the impoundment of the Three Gorges Reservoir in 2003, algal blooms have frequently been observed in it. The chlorophyll a concentration is an important parameter for evaluating algal blooms. In this study, the chlorophyll a concentration in Xiangxi Bay, in the Three Gorges Reservoir, was predicted using HJ-1 satellite imagery. Several models were established based on a correlation analysis between in situ measurements of the chlorophyll a concentration and the values obtained from satellite images of the study area from January 2010 to December 2011. Chlorophyll a concentrations in Xiangxi Bay were predicted based on the established models. The results show that the maximum correlation is between the reflectance of the band combination of B4/（B2＋B3） and in situ measurements of chlorophyll a concentration. The root mean square errors of the predicted values using the linear and quadratic models are 18.49 mg/m3 and 18.52 mg/m3, respectively, and the average relative errors are 37.79% and 36.79%, respectively. The results provide a reference for water bloom prediction in typical tributaries of the Three Gorges Reservoir and contribute to large-scale remote sensing monitoring and water quality management.

基于HJ-1-A卫星CCD相机遥感影像的水体提取

采用面向对象的分析方法(object based image analysis,OBIA),结合水体特征对国产环境卫星(HJ-1-A)CCD相机影像的水体信息进行快速分析、处理和提取.结果表明,对于中低分辨率多光谱遥感影像水体信息的提取,该方法的提取精度在95%以上,优于最小距离法(minimum distance).

基于HJ-1的长汀县森林绿量分析

以福建省长汀县为研究对象,采用3S技术对长汀2012年3月环境资源卫星HJ-1 CCD影像进行处理,依据树种光谱灰度阈值的差异将研究区林木按杉木、松木、竹、阔叶树进行分类,并实测叶面积指数(LAI),计算出长汀县森林绿量。研究结果表明,长汀县有林地面积所占比例为86.62%,总绿量为768 781.2 hm2,其中三州镇、河田镇等乡镇绿量分布属于低水平,铁长乡、庵杰乡等乡镇绿量分布处于较高水平,结合当地水土流失现状发现森林绿量与水土流失程度总体呈负相关。研究结论可为该区域的森林合理经营和可持续发展提供决策支持。

环境一号卫星CCD数据在生态环境监测和评价工作中的应用价值研究

基于环境一号卫星CCD传感器性能,从生态景观角度入手,针对江苏省地形地貌特征,开展了环境一号卫星CCD数据在生态环境监测和评价工作中的应用可行性研究,结果表明环境一号卫星CCD数据可以满足江苏省生态环境监测和评价工作需要,其时间分辨率和幅宽是开展生态监控和预警的重要优势。