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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Response Versus Scan-Angle Assessment of MODIS Reflective Solar Bands in Collection 6.1 Calibration
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Response Versus Scan-Angle Assessment of MODIS Reflective Solar Bands in Collection 6.1 Calibration

机译：Collection 6.1校准中MODIS反光太阳能带的响应与扫描角度评估

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摘要

The Moderate Resolution Imaging Spectroradiometer (MODIS) instruments onboard the Aqua and Terra satellites have been operated for nearly two decades, producing high-quality earth observation data sets suitable for a broad range of scientific studies regarding the earth & x2019;s land, ocean, and atmospheric processes. The high radiometric accuracy of MODIS reflective solar band (RSB) calibration has also served as benchmark measurements for on-orbit cross-calibration studies. As the two MODIS instruments have operated well beyond their design lifespan of six years, the measurements from the onboard calibrators alone become inadequate to characterize the sensor & x2019;s response at all scan angles, as evinced by long-term drifts observed at certain scan positions of the Aqua-MODIS 0.64- and 0.86- bands in Collection 6 (C6) data set. The latest MODIS Level 1B C6.1 data set incorporates earth-view response trending from invariant desert sites as supplemental inputs to characterize the scan-angle calibration dependencies for all RSB. This article presents a deep convective cloud (DCC)-based calibration approach for an independent evaluation of the MODIS RSB response versus scan-angle (RVS) performance in C6.1. The long-term calibration stability and RVS differences in C6.1 have been significantly improved for Aqua-MODIS RSB. The observed RVS differences of more than 2 & x0025; in Aqua-MODIS C6 bands 1 and 2 have been reduced to within 1 & x0025; in C6.1. Some RSBs of Terra-MODIS have suffered temporal drifts up to & x007E;2 & x0025; and calibration shifts up to 3 & x0025;, particularly around 2016 when the Terra satellite entered into safe mode. The DCC approach has been found very effective in tracking the on-orbit RVS changes over time.
机译：在水色和卫星上的适度分辨率成像光谱仪（MODIS）仪器已经运营近二十年，生产高质量的地球观测数据集，适用于有关地球和X2019的广泛科学研究的陆地，海洋，和大气的过程。 MODIS反射太阳能带（RSB）校准的高辐射精度还用作轨道交叉校准研究的基准测量。由于两种MODIS仪器超出了六年的设计寿命，因此单独的板载校准器的测量变得不足以表征传感器和X2019;在所有扫描角度都响应，如在某些扫描在某些扫描中观察到的长期漂移所示AQUA-MODIS 0.64和0.86频段的位置在第6（C6）数据集中。最新的MODIS级别1B C6.1数据集包含从不变的沙漠站点的地球视图响应趋势作为补充输入，以表征所有RSB的扫描角度校准依赖性。本文介绍了一个深入的对流云（DCC），基于C6.1中的MODIS RSB响应与扫描角（RVS）性能的独立评估。对于AQUA-MODIS RSB，C6.1的长期校准稳定性和RVS差异已显着提高。观察到的RVS差异超过2＆x0025;在Aqua-Modis C6带1和2中已减少到1和x0025内;在C6.1中。一些RESB的Terra-Modis遭受了时间漂移到＆x007e; 2＆x0025;当Terra卫星进入安全模式时，校准速度最高可达3＆x0025;，特别是2016年左右。在跟踪On-Orbit RV随着时间的推移时，已发现DCC方法非常有效。

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