基于GIS的中国西部SMMR积雪资料的评价

Evaluation of SMMR Data of Snow Cover in Western China Based on GIS

用ＧＩＳ方法对中国西部的ＳＭＭＲ微波积雪资料进行了初步评价。结果表明：ＳＭＭＲ资料的偏差程度因区域而异，在高海拔的高原区和高山区分别是８ｃｍ和６ｃｍ；低山区和盆地区无需偏差；而低海拔的丘陵区却需要４ｃｍ的偏差。调整后的ＳＭＭＲ资料的区域差异不仅与高程有关，而且还与土壤、植被、坡面等地表特征有关。

In this paper,SMMR data of snow cover in western China have been preliminarily evaluated by using GIS method.The results show the degree to which each individual SMMR file was offset varied according to physiographic region.The two regions with the highest elevations,the plateau and the high mountains,required the largest microwave adjustment,8 cm and 6 cm respectively,the low mountains and the basin required no offset,while the lower elevation rolling hills need an offset of 4 cm.Regional differences in the stepwise adjustment of the SMMR data may be attributed not only to elevation,but also to surface properties such as soil,vegetation,and slope.