新疆北疆地区雪水当量遥感定量研究

为了探讨光学遥感数据反演雪水当量可行性,2009和2010年2月对新疆北疆地区雪密度等参数进行了野外观测.运用连续统去除法对不同类型积雪光谱吸收特征进行分析得出1028nm、1252nm、1494nm和1940nm附近雪深对光谱吸收深度影响显著,积雪深度越大,光谱吸收深度越小.以500m 中分辨率成像光谱仪MODIS影...

Quantitative analysis of snow water equivalent in the region of northern Xinjiang

The purpose of the study was to approach the feasibility of the snow water equivalent retrieved with optical remote sensing data. Field measurement for separate layer snow density and other snow parameters was made in Feb 2009 and 2010. For different snow types, by using continuum removal method, spectral absorption characteristics of snow were analyzed. It comes to the conclusion that snow depth has a significant effect on its spectral absorption at near 1028nm, 1252nm, 1494nm and 1940nm. The deeper the depth, the smaller the absorption depth is. The image of moderate-resolution imaging spectroradiometer with spatial 500m resolution was used as the experimental optical remote sensing data in this study. Based on correlation analysis of the test sample, including reflectance of MODIS channel 5 and 6, elevation and snow pressure, the remote sensing model for the retrieval of snow pressure was built by statistical regression equations. The evaluation results of the model showed that its root mean square error is 0.075 and correlation coefficient between predicted and measured values is 0.72 when snow depth is less than 30 cm.