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[目的]研究洱海流域不透水面遥感信息提取技术,以期开发水污染形成时空过程动态模拟平台。[方法]采用线性光谱分离技术,实现V-I-S模型求解,从2009年Landsat5的TM数据中对洱海流域进行不透水面遥感信息提取,利用植被、高反照度、低反照度和裸土4种最终光谱端元的线性组合,模拟TM波谱特征,并对其分布范围、空间特征等进行了分析。[结果]中等分辨率影像适合于流域尺度的不透水面提取,其结果可靠、精度较好。[结论]该研究结果为选择洱海非点源污染的调控策略、协调经济发展与环境保护的关系提供了决策依据。
[Objective] The research aimed to study the technology of remote sensing information extraction of impervious surface in Erhai Lake Basin, in order to develop a dynamic simulation platform for spatio-temporal process of water pollution. [Method] The VIS model was solved by using the linear spectral separation technique. From the TM data of Landsat5 in 2009, the impermeable surface remote sensing information was extracted from Erhai Lake basin. Using the four kinds of final spectra of vegetation, high albedo, low albedo and bare soil The linear combination of the end elements simulates TM spectral features and analyzes its distribution range, spatial characteristics and so on. [Result] The middle resolution image was suitable for the impermeable surface extraction of watershed scale, the result was reliable and the accuracy was better. [Conclusion] The results of this study provide a basis for decision-making based on the selection of control strategies for non-point source pollution in Erhai Lake and the coordination between economic development and environmental protection.