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首页> 外文会议>Conference on Earth Observing Systems VII, Jul 7-10, 2002, Seattle, USA >Inter-comparison of the longwave infrared channels of MODIS and AVHRR/NOAA-16 using simultaneous nadir observations at orbit intersections
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Inter-comparison of the longwave infrared channels of MODIS and AVHRR/NOAA-16 using simultaneous nadir observations at orbit intersections

机译：MODIS和AVHRR / NOAA-16的长波红外通道的相互比较，使用在轨道交叉点同时进行的最低点观测

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摘要

Near nadir observations in the 11μm and 12μm bands of the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard the TERRA spacecraft and the Advanced Very High Resolution Radiometer (AVHRR) onboard the NOAA-16 spacecraft are collected at their orbit intersections, where both MODIS and AVHRR view the Earth and its atmosphere at the same location within 30 seconds in the Arctic region. Sample data with 1 km resolution from spatially uniform areas are taken for direct inter-comparison of the scene radiance and brightness temperatures at around 270 K. Then a pixel-by-pixel match between the MODIS and AVHRR observations is performed to evaluate their correlation at different scene temperatures. The results show that MODIS and AVHRR observations agree well (difference less than 0.3 K) for both the 11μm and 12μm bands, although their band correlation exhibits a slightly non-linear trend for scene temperatures greater than 285 K. The performance of MODIS is considered a good predictor of the performance of the National Polar-orbiting Operational Environmental Satellite System (NPOESS) /Visible Infrared Imager/Radiometer Suite (VIIRS), the future replacement of AVHRR. The direct comparison of MODIS and AVHRR observations is therefore considered a risk reduction study for VIIRS.
机译：TERRA航天器上的中分辨率成像光谱仪（MODIS）和NOAA-16航天器上的超高分辨率高分辨率辐射仪（AVHRR）在11μm和12μm波段中的近天底观测值是在其轨道交叉点收集的，MODIS和AVHRR在30秒钟内在北极地区的同一位置查看地球及其大气层。从空间均匀区域获取分辨率为1 km的样本数据，以直接比较270 K附近的场景辐射度和亮度温度。然后在MODIS和AVHRR观测值之间进行逐像素匹配，以评估它们之间的相关性。不同的场景温度。结果表明，对于11μm和12μm波段，MODIS和AVHRR观测值吻合良好（相差小于0.3 K），尽管当温度高于285 K时，它们的波段相关性呈现出轻微的非线性趋势。考虑了MODIS的性能很好地预测了国家极轨运行环境卫星系统（NPOESS）/可见红外成像仪/辐射计套件（VIIRS）的性能，它是AVHRR的未来替代品。因此，将MODIS和AVHRR观测值的直接比较视为VIIRS的风险降低研究。

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