Multi-scale validation strategy for satellite albedo products and its uncertainty analysis
Multi-scale validation strategy for satellite albedo products and its uncertainty analysis
复制标题
卫星反照率产品多尺度验证策略及其不确定性分析
DOI：
10.1007/s11430-014-4997-y
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Shi Jian
中科院分区：
文献类型：
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作者：
Peng JingJing;Liu Qiang;Wen JianGuang;Liu QinHuo;Tang Yong;Wang LiZhao;Dou BaoCheng;You DongQin;Sun ChangKui;Zhao XiaoJie;Feng YouBin;Shi Jian
粗分辨率卫星遥感产品对于气候变化和能量平衡研究很重要，因为它们能够在区域和全球范围内描述陆地表面参数的时空模式。粗分辨率产品的精度通常通过现场测量内的比较来评估。在比较遥感观测与现场测量的关键问题是尺度和不确定性。本文提出了一种战略，验证1公里分辨率的遥感产品使用现场测量和高分辨率遥感观测。收集了现场测量数据，以校准来自HJ-1a/B图像的高分辨率（30 m）的多分辨率产品。然后，对校准的高分辨率多分辨率图进行重新采样（即，放大）以评估粗分辨率的ARMDO产品的准确性。现场测量和高分辨率像素的样本是基于不确定性分析。利用全球陆面卫星（GLASS）和中分辨率成像光谱仪（MODIS）两种粗分辨率遥感数据，在黑河中游地区进行了验证。结果表明，利用实测数据标定的环境监测卫星星座，可以为粗分辨率卫星星座产品的验证提供准确的参考值。然而，应该估计放大的HJ图像中的不确定性，并且应该从验证过程中排除具有大不确定性的像素。
Coarse-resolution satellite albedo products are important for climate change and energy balance research because of their capability to characterize the spatiotemporal patterns of land surface parameters at both the regional and global scales. The accuracy of coarse-resolution products is usually assessed via comparison within situmeasurements. The key issue in the comparison of remote sensing observations within situmeasurements is scaling and uncertainty. This paper presents a strategy for validating 1-km-resolution remote sensing albedo products using field measurements and high-resolution remote sensing observations. Field measurements were collected to calibrate the high-resolution (30 m) albedo products derived from HJ-1a/b images. Then, the calibrated high-resolution albedo maps were resampled (i.e., upscaled) to assess the accuracy of the coarse-resolution albedo products. The samples of field measurements and high-resolution pixels are based on an uncertainty analysis. Two types of coarse-resolution albedo datasets, from global land surface satellite (GLASS) and moderate-resolution imaging spectroradiometer (MODIS), are validated over the middle reaches of the Heihe River in China. The results indicate that the upscaled HJ (Huan Jing means environment in Chinese and this refers to a satellite constellation designed for environment and disaster monitoring by China) albedo, which was calibrated using field measurements, can provide accurate reference values for validating coarse-resolution satellite albedo products. However, the uncertainties in the upscaled HJ albedo should be estimated, and pixels with large uncertainties should be excluded from the validation process.