基于MODIS数据的雪深反演--以天山北坡经济带为例

应用中分辨率成像光谱仪（MODIS）数据进行雪深遥感反演理论和方法的研究.利用全波 段地物光谱仪对不同深度的积雪进行反射光谱值野外量测且同步测定雪深,通过分析雪深和 反射光谱值的关系确定反演雪深的MODIS最佳观测通道,应用新疆地区冬季MODIS 1B数据, 以天山北坡经济带为实验区,结合该区域同期气象台地面雪深观测记录数据建立雪深遥感反 演数学公式.雪深反演结果与实测值对比表明,应用MODIS数据进行大区域雪深反演时 ,其结果具有分辨率高、监测范围广的特点,可以清楚反映积雪覆盖范围和雪深空间分布特征,对地表径流量计算、农业开发等具有应用价值.

Inversion of Snow Depth from MODIS Data:A Case Study of the Nor thern Slope Economic Zone of Tianshan Mountain

For its high spectral and time resolution, MODIS data was more suitable for the inversion of snow depth compared to NOAA and other remotely sensed data. The ASD (Analytical Spectral Devices) was used to measure the spectrum of snow in different depth levels. The spectral characteristics of the snow at various depth levels were studied and the relationship between the reflectance and the snow depth was analyzed. Thus, the best channels of MODIS for snow depth inversion were identified based on the experiments. In this paper, the authors take northern slope economic zone of Tianshan Mountain as an example to inverse the snow depth. The MODIS 1B level images of Xingjiang from Dec. 2004 to Mar. 2005 were obtained as the remote sensing data source. Recorded snow depths were acquired from the meteorological station as field sample data. The relationship between MODIS reflectance and snow depth was built up and used to do the inversion of the whole study area. According to comparison of the inversed snow depth and the field measured depth, the authors find that the method has the advantage of high accuracy and great monitoring range. The result clearly demonstrates the snow coverage and the distribution of the snow depth. The inversed results could be well used in the calculation of surface runoff and the development planning of the agriculture.