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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Characterization of Terra and Aqua MODIS VIS, NIR, and SWIR Spectral Bands' Calibration Stability
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Characterization of Terra and Aqua MODIS VIS, NIR, and SWIR Spectral Bands' Calibration Stability

机译：Terra和Aqua MODIS VIS，NIR和SWIR光谱带的校准稳定性的表征

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摘要

The Moderate Resolution Imaging Spectroradiometer (MODIS) has successfully operated onboard the Terra spacecraft for more than 12 years and the Aqua spacecraft for more than ten years. It has 20 reflective solar bands covering the visible (VIS), near infrared (NIR), and short-wave infrared (SWIR) spectral regions. They are calibrated on orbit using regularly scheduled solar diffuser measurements and lunar observations. In recent years, observations over selected ground targets are also used to monitor detector responses at different angles of incidence. This paper provides a brief description of MODIS on-orbit calibration and characterization methodologies and examines the calibration stability of the VIS, NIR, and SWIR spectral bands over the entire missions of both instruments. Results obtained from four different vicarious approaches (deserts, Dome Concordia, deep convective cloud, and simultaneous nadir overpass) show that Terra MODIS VIS and NIR spectral bands have a wavelength-dependent drift in reflectance with a drop up to 8$%$ in the shortest wavelength region. All four approaches have a relative agreement to within 2.0$ %$ with an uncertainty of less than 1.5$%$ for most bands. It is anticipated that the improvements made in the MODIS Collection 6, with additional corrections based on the desert reflectance trending results, will significantly reduce, if not completely remove, some of the trending drifts identified in the Collection-5 data product.
机译：中分辨率成像光谱仪（MODIS）在Terra航天器和Aqua航天器上已经成功运行了超过12年。它有20个反射性太阳波段，覆盖可见（VIS），近红外（NIR）和短波红外（SWIR）光谱区域。使用定期安排的太阳漫射器测量和月球观测在轨道上对它们进行了校准。近年来，对选定地面目标的观测也被用来监视探测器在不同入射角下的响应。本文简要介绍了MODIS的在轨校准和表征方法，并考察了这两种仪器在整个飞行任务中VIS，NIR和SWIR光谱带的校准稳定性。从四种不同的替代方法（沙漠，穹顶康科迪亚，深对流云和同时的最低点天桥）获得的结果表明，Terra MODIS VIS和NIR光谱带的反射率具有波长相关的漂移，下降幅度最大为8。 inline“> $％$ 在最短的波长区域。四种方法在2.0 $％$ 内均具有相对一致性，不确定度小于1.5 $％$ 适用于大多数乐队。可以预期，MODIS Collection 6中所做的改进以及基于沙漠反射趋势结果的其他校正将显着减少（即使不能完全消除）Collection-5数据产品中确定的某些趋势漂移。

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