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首页> 外文期刊>Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of >Preliminary Evaluation of Sentinel-1A Wind Speed Retrievals
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Preliminary Evaluation of Sentinel-1A Wind Speed Retrievals

机译:Sentinel-1A风速检索的初步评估

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摘要

The accuracy of wind speed retrievals from synthetic aperture radars (SARs) is strongly dependent upon the accuracy of the normalized radar cross section measurement. Here, we make a preliminary assessment of wind speed retrievals from Sentinel-1A. In particular, we use Sentinel-1A SAR imagery to compute wind speed at 500-m resolution. These measurements are averaged to 25 km and compared with advanced scatterometers (ASCAT) wind speed measurements from the METOP-A and METOP-B satellites. Spatially coincident measurements separated by less than 2 h are shown to agree to better than 2 m/s in standard deviation for wind speeds less that 20 m/s. Particularly, good agreement is found for Sentinel-1A VV-polarization measurements, though both HH- and VV-measurements exceed the 2 m/s accuracy standard.
机译:从合成孔径雷达(SAR)检索风速的准确性很大程度上取决于归一化雷达横截面测量的准确性。在这里,我们对从Sentinel-1A检索到的风速进行了初步评估。特别是,我们使用Sentinel-1A SAR图像来计算500 m分辨率下的风速。这些测量结果平均为25 km,并与METOP-A和METOP-B卫星的先进散射仪(ASCAT)的风速测量结果进行比较。当风速小于20 m / s时,间隔小于2 h的空间重合测量结果表明标准偏差优于2 m / s。特别是,尽管HH和VV测量均超过了2 m / s的精度标准,但Sentinel-1A VV极化测量已找到了很好的协议。

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