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引用本文:

DOI:

10.11834/jrs.20133118

收稿日期:

2013-05-09

修改日期:

2013-08-18

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3种反演算法的地表反照率遥感产品对比分析
1.北京师范大学 全球变化与地球系统科学学院, 北京 100875;2.中国地质大学(北京)土地科学技术学院, 北京 100083;3.遥感科学国家重点实验室 中国科学院遥感与数字地球研究所, 北京 100101
摘要:

地表反照率对于地表能量平衡和全球气候变化具有重要的影响。近年来,地表反照率产品已经取得了较为广泛的应用,但是仍存在时间分辨率低和数据缺失等问题。本文基于均匀站点观测数据与MODIS的MCD43B3产品验证了GLASS (Global LAnd Surface Satellite)地表反照率产品的3种算法及其对应的反照率产品:AB1(ABD01)、AB2(ABD03)和STF(ABD06)。并分析比较了GLASS反照率初级产品到最终产品的质量提升。结果表明:最终产品ABD06与地面观测数据符合最好,RMSE为0.050,R2为0.788;同时,ABD06与MCD43B3反照率产品一致性最好,RMSE优于0.03,R2达到0.9,且ABD06有效数据最多(ABD01为4290,ABD03为3296,ABD06为5507),比较适合生产长时间序列的反照率产品。大量数据的统计结果还表明:3种GLASS产品80%以上的数据与地面观测数据的偏差均能满足气候模式对反照率的精度要求(0.02—0.05)。

Comparison analysis based on different inverse algorithms of surface albedo products
Abstract:

Surface albedo significantly affects the balance of surface energy and variation of global climate. Previously, surface albedo products have achieved significant success; however, many problems remain, such as low temporal resolution and missing data. Based on the observation data of uniform sites and MCD43B3 production of MODIS, this article verifies three algorithms and their products that arrive separately from a surface albedo production called Global LAnd Surface Satellite (GLASS): AB1(ABD01), AB2(ABD03), and STF(ABD06). Then, we analyze and compare the improvement in quality between the initial and final products of GLASS. The result shows that the product ABD06 has the best matching with ground observation data, where the RMSE is 0.050 and R2 is 0.9. In addition, compared with MCD43B3's surface albedo product, the best consistency is also observed for ABD06, which is supported by the largest number of valid data among the three different products (ABD06 is 5507, ABD01 is 4290, and ABD03 is 3296), and the RMSE is better than 0.03, while R2 is 0.9. Therefore, ABD06 is suitable for the production of long time series' surface albedo products. The statistical result for a large amount of data also shows that with up to 80% of the data coming from GLASS's three products, we can satisfy the accuracy requirement for the deviation between the climate model of the surface albedo and products (0.02—0.05).

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