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首页> 外文期刊>Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of >Validation of Aquarius Soil Moisture Products Over the Northwest of Spain: A Comparison With SMOS
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Validation of Aquarius Soil Moisture Products Over the Northwest of Spain: A Comparison With SMOS

机译：西班牙西北部水瓶座土壤水分产品的验证：与SMOS的比较

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摘要

A validation of the new L2 and L3 soil moisture products from the Aquarius/SAC-D mission from August 2011 to June 2014 using two in situ networks in Spain was conducted. The first network, the Soil Moisture Measurement Stations Network of the University of Salamanca (REMEDHUS), is considered to be a dense network. The second network (Inforiego) could be considered a sparse or large-scale network. Comparisons of temporal series using different strategies were made. Similar analysis was performed for the same area and period with two soil moisture ocean salinity (SMOS) soil moisture products: SMOS L2 and SMOS Barcelona Expert Center (BEC) L3. The aim of the study was to analyze the performance of the Aquarius soil moisture products and to compare with that of SMOS soil moisture. Results from the area-averaged comparison show that Aquarius products have correlation coefficients (R) between 0.33 and 0.65, and root-mean-square difference (RMSD) and centered RMSD (cRMSD) between 0.046 and $0.111,text{m}^3text{m}^{-3}$. A better match was found for the L2 ascending series than for the L2 descending and L3 series. A dry bias was found. SMOS products showed better accuracy $(text{R} > 0.8$, RMSD and $text{cRMSD}sim 0.06 text{m}^{3}text{m}^{-3}$) than those of Aquarius. The comparison made at point-scale reflected that the size and density of the networks do not influence the validation results at the Aquarius resolution, but it is remarkable at the SMOS resolution. Despite the scale restrictions, the results of this study showed that Aquarius soil moisture products have reasonably good performance.
机译：2011年8月至2014年6月，Aquarius / SAC-D任务使用西班牙的两个现场网络对新的L2和L3土壤水分产品进行了验证。第一个网络是萨拉曼卡大学的土壤水分测量站网络（REMEDHUS），被认为是一个密集的网络。第二个网络（Inforiego）可以被视为稀疏或大规模网络。使用不同策略比较时间序列。使用两个土壤湿度海洋盐度（SMOS）土壤湿度产品：SMOS L2和SMOS Barcelona Expert Center（BEC）L3对相同区域和时期进行了类似的分析。该研究的目的是分析水瓶座土壤水分产品的性能，并与SMOS土壤水分进行比较。面积平均比较的结果显示，水瓶座产品的相关系数（R）在0.33和0.65之间，均方根差（RMSD）和中心RMSD（cRMSD）在0.046和$ 0.111之间，text {m} ^ 3text { m} ^ {-3} $。发现L2上升系列比L2下降系列和L3系列更好的匹配。发现干偏差。与Aquarius相比，SMOS产品显示出更高的精度$（text {R}> 0.8 $，RMSD和$ text {cRMSD} sim 0.06 text {m} ^ {3} text {m} ^ {-3} $）。在点尺度上进行的比较反映出，在Aquarius分辨率下，网络的大小和密度不会影响验证结果，但在SMOS分辨率下，显着。尽管有规模限制，但这项研究的结果表明，水瓶座土壤水分产品具有相当好的性能。

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