洱海流域不透水面遥感信息提取技术研究

Study on Remote Sensing Information Extraction Technology for the Impervious Surface of Erhai Basin

[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] To study the remote sensing information extraction technology for the impervious surface of Erhai basin with the aim to develop dynamic simulation platform for the formation of water pollution.[Method] Linear spectral separation technology was used to achieve V-I-S model solution,extracting remote sensing information of the impervious surface of Erhai basin from the TM data of Landsat5 in 2009.The linear combination of 4 kinds of endmember spectra,namely vegetation,high anti-illumination,low anti-illumination and bare soil,were used to simulate the TM spectral characteristics,and its distribution and spatial characteristics were analyzed.[Result] Middle-resolution image is suitable for the basin-scaled impervious surface extraction with reliable results and satisfactory accuracy.[Conclusion] This study provided basis for deciding the relationship between the regulation strategy on the non-point source pollution of Erhai Lake,coordinated economic development and environmental protection.