从AVHRR到MODIS的雪盖制图研究进展

雪盖面积是水文、气候模型中重要的输入参数之一。使用遥感方法能够有效获取大范围的雪盖信息，弥补地面观测资料在空间上的不足。阐述积雪遥感基本原理以及积雪遥感监测的研究进展，介绍现阶段应用较广的基于AVHRR和MODIS数据的雪盖制图算法，并通过对制图算法的比较和分析得出，MODIS雪盖制图算法的精度和效率都比AVHRR算法高。最后讨论现阶段雪盖制图算法误差的主要来源：大气状况、地表覆盖、积雪物理特性的复杂性以及使用相同的检测阈值等，并提出解决方法。

The Development of Snow-Cover Mapping from AVHRR to MODIS

Snow- cover area is one of the most important parameters for hydrologic and dimatologic models. Contrasted to the lack of data in field,we can obtain enough snow-cover information in large-scale by remote sensing. In the past four decades,many studies have been done to improve the snow-cover mapping algorithms in the world. Firstly, this paper shows the fundamental of these algorithrns and reviews the researches of remote sensing in snow - cover mapping. Then a comparison is made between AVHRR and MODIS algorithms. Lastly,the complexity of snow cover mapping by remote sensing is discussed, including the differences of atmospheric conditions, land cover types,snow characters, etc.