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首页> 外文期刊>Remote Sensing of Environment: An Interdisciplinary Journal >Comparison of high-resolution airborne soil moisture retrievals to SMAP soil moisture during the SMAP validation experiment 2016 (SMAPVEX16)
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Comparison of high-resolution airborne soil moisture retrievals to SMAP soil moisture during the SMAP validation experiment 2016 (SMAPVEX16)

机译：高分辨率空气载水分检索对微量空气湿度检索在SMAP验证实验期间对污染土壤水分的比较2016（Smapvex16）

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The NASA's Soil Moisture Active Passive (SMAP) mission conducted a field experiment with its partners over two 40-km agricultural domains in Iowa and Manitoba in the summer of 2016 to address concerns observed in SMAP soil moisture (SM) retrievals over agricultural areas. The experiment featured airborne Passive Active L-band System (PALS) flights over each domain with intensive ground measurements and dense networks of SM monitoring stations. With two intensive observation periods separated in time (May 28 June 20 and July 14 August 16), the flights captured both early-season/low vegetation and later-season/high-vegetation conditions. The comparison of the PALS brightness temperature (TB) measurements to the SMAP TB observed over the sites resulted in root mean square difference (RMSD) of 2.8 K and 4.0 K for vertical and horizontal polarizations, respectively. The subsequent SM analysis resealed the PALS TB with the SMAP TB to allow equitable comparisons between the SM retrievals from the two instruments. The PALS SM retrieval algorithm used the SM sampled by the ground teams during the overpass days for tuning, and was parameterized by a high-resolution vegetation water content product calibrated using vegetation samples collected during the experiment. The tuning process was not able to find a satisfactory result with a temporally constant set of parameters in the single channel algorithm for the two intensive observation periods of the experiment. This result indicated that the rapid change in the vegetation structure during the growth stages and likely variation in the surface roughness conditions were not compatible with rigid parameterization over the entire period. However, using seasonally variable parameters we found that it was possible to retrieve soil moisture with satisfactory accuracy. Comparative analysis with the SMAP SM product included aggregation of the PALS SM to the SMAP pixel-scale. The RMSD between the PALS SM and the aggregated manual field
机译：美国宇航局的土壤水分活跃被动（SMAP）任务在2016年夏天在Iowa和Manitoba的两个40公里农业域中进行了一个野外实验，以满足在农业领域的Smap土壤水分（SM）检索中观察到的担忧。该实验特色以空中被动活动L波段系统（PALS）在每个域上飞行，具有密集的地面测量和密集的SM监测站网络。两次密集的观察时期及时分开（5月28日和8月14日7月16日），航班捕获了早期/低植被和后期/高植被条件。 PAL亮度温度（TB）测量对位点观察到的SMAP TB的比较导致垂直和水平偏振的根均值（RMS）为2.8k和4.0k。随后的SM分析用SMAP TB重新进行了PALS TB，以允许两种仪器的SM检索之间的公平比较。 PALS SM检索算法使用地面团队在立交天后进行调谐的SM采样，并且由在实验期间收集的植被样品进行校准的高分辨率植被水含量产品。调谐过程无法在单通道算法中找到令人满意的结果，在实验的两个强化观察时段中的单通道算法中的时间上常数参数集。该结果表明，在生长阶段期间植被结构的快速变化和表面粗糙度条件的可能变化与整个时期的刚性参数化不兼容。然而，使用季节性可变参数，我们发现可以以满意的精度检索土壤水分。与SMAP SM产品的比较分析包括PALS SM的聚合到SMAP像素级。 PALS SM与聚合手册字段之间的RMSD

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