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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Assess Calibration Consistency of MODIS and AVHRR Thermal Infrared Bands Using SNO Observations Corrected for Atmospheric Effects
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Assess Calibration Consistency of MODIS and AVHRR Thermal Infrared Bands Using SNO Observations Corrected for Atmospheric Effects

机译：使用校正了大气影响的SNO观测值评估MODIS和AVHRR热红外波段的校准一致性

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摘要

Monitoring environmental changes from space requires extremely well-calibrated observations to achieve the necessary high accuracy and stability. The calibration differences between the Moderate Resolution Imaging Spectroradiometer (MODIS) and the Advanced Very High Resolution Radiometer (AVHRR) thermal bands provide a valuable quality assessment of the instrument performance. This letter compares the calibration differences between the Aqua MODIS and NOAA-18 AVHRR bands at 11.0 and 12.0 ${rm mu}hbox{m}$ using simultaneous nadir overpass observations obtained in nearly parallel orbits. Impacts due to the relative spectral-response differences between the two sensors are estimated by MODTRAN simulations with real-time atmospheric profiles of temperature, water vapor, atmospheric pressure and ozone, and surface skin temperatures. Results show that the temperature difference after the removal of atmospheric impacts is within 0.30 K (or 0.40% in radiance) across the effective calibration range for the 11.0-${rm mu}hbox{m}$ band/channel. For the 12.0-${rm mu}hbox{m}$ band, the differences are 0.40 K (or 0.50%) at the typical radiance and up to 0.70 K (or 0.90%) close to the maximum radiance, indicating an excellent calibration consistency between MODIS and AVHRR for both bands.
机译：监测太空环境变化需要对观测值进行严格校准，以实现必要的高精度和稳定性。中分辨率成像光谱仪（MODIS）和超高分辨率高分辨率辐射计（AVHRR）热谱带之间的校准差异为仪器性能提供了有价值的质量评估。这封信使用在几乎平行的轨道上获得的同时最低点天桥观测值，比较了11.0和12.0美元的Aqua MODIS和NOAA-18 AVHRR波段之间的校准差异。通过MODTRAN仿真，使用温度，水蒸气，大气压力和臭氧以及皮肤表面温度的实时大气剖面，可以估算出由于两个传感器之间相对光谱响应差异而产生的影响。结果表明，去除大气影响后的温度差在11.0- $ hbox {m} $频段/通道的有效校准范围内在0.30 K以内（或辐射度的0.40％）。对于12.0-$ {rm mu} hbox {m} $波段，在典型辐射率下的差异为0.40 K（或0.50％），在最大辐射率附近的差异最大为0.70 K（或0.90％），表明校准非常好两个频段的MODIS和AVHRR之间的一致性。

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