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首页> 外文会议>Sensors, systems, and next-generation satellites XII >Examination of calibration performance of multiple POS sensors using measurements over the Dome C site in Antarctica
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Examination of calibration performance of multiple POS sensors using measurements over the Dome C site in Antarctica

机译：使用对南极Dome C站点的测量来检查多个POS传感器的校准性能

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摘要

The Dome C site, located at Dome Concordia in Antarctica, has one of the most homogeneous land surfaces on Earth in terms of reflectance and temperature. An in-situ research-based automatic weather station (AWS) provides a continuous record of surface climate conditions. The extreme cold, dry and clean atmosphere of the site is ideal to collect overpass data for sensor validation and inter-comparison study. This study uses measurements from multiple sensors on-board polar orbiting satellites including both Terra/Aqua MODIS and NOAA-15 to 18 AVHRR that overpass the Dome C site to examine each sensor's long-term calibration stability and biases between two similar sensors. Validation is performed based on observed near-nadir top-of-atmosphere (TOA) reflectances of one visible and near-IR spectral band and brightness temperatures of two atmospheric window bands. Trends of the reflectance show that they are strongly anisotropic and thus a BRDF (bi-directional reflectance distribution) model developed based on near surface reflectance measurements over Antarctic snow surface is applied to normalize the TOA reflectances. The BRDF normalization produces stable trends of reflectance with variations of within 1.5% for Terra/Aqua MODIS and 1% and 2% for NOAA-16 and 17 AVHRR, respectively. For the atmospheric window bands, observed brightness temperatures are referenced to the same time near-surface temperatures collected at the AWS. Trending results show that the atmospheric window bands are maintained to be stable, while the temperature differences among NOAA-15 to 18 AVHRR are up to 2.0K, compared with small differences of within 0.10K found between Terra and Aqua MODIS.
机译：Dome C站点位于南极洲的Dome Concordia，就反射率和温度而言，它是地球上最均匀的陆地表面之一。基于现场研究的自动气象站（AWS）可连续记录地表气候状况。该场所极度寒冷，干燥和清洁的气氛非常适合收集用于传感器验证和比对研究的立交桥数据。这项研究使用了来自多个传感器的极轨卫星的测量值，包括Terra / Aqua MODIS和NOAA-15至18 AVHRR，它们都超过了Dome C站点，以检查每个传感器的长期校准稳定性以及两个相似传感器之间的偏差。基于观察到的一个可见光谱和近红外光谱带的近天底大气顶部（TOA）反射率和两个大气窗带的亮度温度进行验证。反射率的趋势表明它们具有强烈的各向异性，因此将基于南极雪表面近表面反射率测量结果开发的BRDF（双向反射率分布）模型应用于归一化TOA反射率。 BRDF归一化产生稳定的反射率趋势，Terra / Aqua MODIS的变化在1.5％以内，NOAA-16和17 AVHRR的变化分别在1％和2％之内。对于大气窗带，观测到的亮度温度是指在AWS收集的同一时间近地表温度。趋势结果表明，大气窗口带保持稳定，而NOAA-15至18 AVHRR之间的温度差高达2.0K，而Terra和Aqua MODIS之间的差值在0.10K以内。

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