基于MOS-1b/MESSR的洪灾遥感监测

以湖南洞庭湖为研究区，MOS-1b/MESSR影像数据作为遥感信息源，应用ERDAS IMAGINE处理系统，对枯水期和洪水期两个不同时相的各波段影像数据进行组合运算、比值变换等处理，以及影像、光谱、直方图的对比分析。基于处理与分析结果，利用分类技术，建立了水体分类模型（B1+B2）/(B3+B4)>t，可快速准确地提取水体信息；同时，还提取和建立了水深系数模型WDI=B1/B2，得出了基于非线性回归分析的水体深度探测模型。依据洪水信息提取模型，对枯水期与洪水期的分类专题图进行叠加分析，得到了洞庭湖区洪水期的洪水分布图与洪水淹没信息，可为防洪救灾决策提供重要的科学依据。

Application of MOS-1b/MESSR Data in Monitoring Flood Disaster

Remote sensing technique is playing an important role in flood monitoring and assessing system. This paper takes Dongting Lake district as the studying area and utilizes multi-temporal MOS-1b/MESSR data as remote sensing info source. By the combination operation and ratio transform processing and the image, spectrum and histogram comparison of the MESSR image data of all bands for the flooding season and dry season with the ERDAS IMAGINE system, a classification model (B1+B2)/(B3+B4)>t is established, in which model can be used to acquire the spatial distributing information of water bodies.Meanwhile a water depth index (WDI ) model WDI=B1/B2 is derived and built and then a model for detecting the depth of waterbody based on the non-linear recursive analysis. By the overlay analysis of the classification thematic images based on themodel for extracting flood information, the flooding area and distributing information is acquired, which can offer an important scientific basis for flood fighting and prevention in time.