基于积雪调查数据的东北地区被动微波积雪遥感产品精度验证与分析

积雪遥感数据产品可以提供积雪的时空分布信息，是积雪监测的重要数据源。对现有的不同遥感产品进行精度验证和对比分析，明确其适用范围，有利于积雪数据产品的进一步发展和应用。为验证积雪产品在东北地区的适用性，以中国积雪特性及分布调查项目为依托，精心设计野外实验，观测了东北地区25 km典型样方和积雪线路调查数据，验证了在阔叶林和农田两种下垫面下，FY-3B雪深产品、AMSR-2雪深产品、GlobSnow雪水当量产品在东北地区的反演精度。结果表明：GlobSnow雪水当量产品精度最高，不区分下垫面的情况下，最大偏差和均方根误差分别为10.87 cm和12.53 cm。考虑下垫面的影响，GlobSnow雪水当量产品和FY-3B雪深产品在两种下垫面下的雪深反演精度差别很小，偏差和均方根误差的差值小于2.11 cm和3.46 cm，AMSR-2积雪产品在两种下垫面下反演精度差别很大，两种下垫面下偏差和均方根误差的差值大于9.94 cm和7.19 cm。对于3种积雪产品，下垫面为农田的雪深反演精度均高于下垫面为阔叶林的反演精度。

Based on Snow Cover Survey Data of Accuracy Verification and Analysis of Passive Microwave Snow Cover Remote Sensing Products in Northeast China

Snow cover products can provide temporal and spatial information on snow cover distribution,which is an important data source for snow monitoring. The accuracy validation and contrastive analysis of the remote sensing products are helpful to the further development and application of snow cover data products. the survey project of snow cover characteristics and distribution in China are taken for validating the applicability of snow cover products in Northeast China,The inversion accuracy of FY-3B snow depth product, AMSR-2 snow depth product and GlobSnow snow equivalent product under two underlying surface of Broadleaf Forests and Croplands were verified by using the 25 km typical quadrats and snow path survey data in Northeast China. The results show that the precision of GlobSnow snow water equivalent product has the highest accuracy and the maximum deviation and root mean square error without distinguishing the underlying surface are respectively 10.87 cm and 12.53 cm.The inversion accuracy between GlobSnow snow equivalent product and FY-3B snow depth product under two underlying surfaces is very little and the difference of deviation and root mean square error between two products is respectively smaller than that of 2.11 cm and 3.46 cm.The inversion accuracy of AMSR-2 products under two kinds of underlying surfaces is significant different and the difference of deviation and root mean square error between the two underlying surfaces is greater than that of 9.94 cm and 7.19 cm. For the three snow products, The inversion accuracy of snow depth on the underlying surface of croplands is higher than that of broadleaf forests on the underlying surface.