【摘要】 针对多种地表植被类型中等分辨率成像光谱仪(MODIS)短波地表反照率产品进行验证,并评估了雪对不同类型地表的反照率产品的影响。选取了19个AmeriFLUX站点的实测反照率数据对2005年的MODIS短波反照率数据进行验证,站点涉及常绿针叶林、落叶阔叶林、草地、湿地、灌木林和农田6种植被覆盖类型。结果显示受雪的影响时,每种植被类型的反照率产品质量都有所下降,其中常绿针叶林受影响最大,其反演误差、均方根误差、标准差从0.002 3、0.023 0、0.011 4增至0.0825、0.108 5、0.086 6。综合所有数据,受雪的影响总的反演误差绝对值从0.020 6增至0.035 5,均方根误差从0.057 2增至0.121 7,标准差从0.053 9增至0.187 0。更多还原

【Abstract】 This paper evaluates moderate-resolution imaging spectroradiometer(MODIS) shortwave land surface albedo products over multiple land cover types,especially the impact of snow on these data.We choose 19 sites from AmeriFLUX to validate MODIS shortwave albedo products in the year of 2005.These sites are covered by evergreen needleleaf forest,deciduous broadleaf forest,grassland,wetland,shrubland and cropland.For every vegetation type,the albedo inversion quality is worse with snow cover than snow free.Snow has the most impact on evergreen needleleaf forests than others.For this land cover type,the bias,root-mean-square error(RMSE) and standard deviation(STD) performances of albedo inversion increase from ?0.002 3,0.023 0,and 0.011 4 to 0.082 5,0.108 5 and 0.086 6,respectively.For all data,the total bias,RMSE and STD increase from 0.020 6,0.057 2 and 0.0539 to 0.035 5,0.121 7 and 0.187 with effect of snow.更多还原