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遥感地表反照率产品的验证与分析是将其应用于环境研究的基础。采用中国通量网的地表实测短波反照率数据对MODIS反照率产品进行对比和分析,针对选取的8个地面站点,提取了2004年的MODIS反照率产品并进行验证。这些站点的植被覆盖情况涵盖了草地、森林和农业用地。结果显示MODIS在多数情况下能提供准确的地表反照率产品。针对各个站点的误差、均方根误差、相关系数分析都显示了这个结果,总体反演误差在0.002左右。较大的误差出现在有冰雪影响的时候,排除受积雪影响的数据,总体均方根误差可达0.028。分析了引起误差的原因并提出了改进意见。
The verification and analysis of remote sensing surface albedo products is the basis for its application to environmental studies. MODIS albedo products were compared and analyzed using the measured shortwave albedo data from the Chinese flux network. The MODIS albedo products of 2004 were extracted and validated for the selected 8 ground stations. Vegetation coverage at these sites covers grasslands, forests and agricultural land. The results show that MODIS provides accurate surface albedo products in most cases. For each site error, root mean square error, correlation coefficient analysis shows this result, the overall inversion error of about 0.002. Larger errors occur when there is ice and snow effects, excluding snow-affected data with an overall root-mean-square error of up to 0.028. Analyzes the causes of the errors and puts forward some suggestions for improvement.