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首页> 外文会议>Conference on Earth Observing Systems VII, Jul 7-10, 2002, Seattle, USA >New Results of Ground Target Based Calibration of MOS on IRS
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New Results of Ground Target Based Calibration of MOS on IRS

机译：基于地面目标的IRS MOS标定的新结果

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摘要

The success of the Modular Optoelectronic Scanner MOS on the Indian Remote Sensing Satellite IRS-P3 during the 6 years mission time has been based on its sophisticated in-orbit calibration concept to a large extent. When the internal lamp and the sun calibration failed in September 2000 we tested the possibility of ground target based (or vicarious) calibration of the MOS instruments to continue the high data quality. This is essential for future watching of global changes of the ocean coastal zones (phytoplancton, sediments, pollution, etc.) using spectral measurements of the VIS/NIR MOS spectral channels. The investigations have shown the suitability of a part of the Great Eastern Erg in the Sahara desert for this purpose. The satellite crosses this very homogeneous area every 24 days. Because of the good cloudfree conditions we can use 6 - 8 overflys a year for calibration. The seasonal variability of the surface reflectance is very small so that we obtain relative calibration data of sufficient accuracy even without ground truth measurements for most of the channels. The trend of this "vicarious" calibration corresponds very well with the previous trend of the failed lamp and sun calibration. Differences between the three methods will be discussed. In the paper we will also present the results of a comparison between SeaWiFS and MOS data of comparable spectral channels from the Great Eastern Erg area. They confirm the suitability of this area for calibration purposes too.
机译：模块化光电扫描仪MOS在6年任务期内在印度遥感卫星IRS-P3上的成功很大程度上取决于其先进的在轨校准概念。当内部灯和太阳校准在2000年9月失败时，我们测试了基于地面目标（或替代）校准MOS仪器的可能性，以保持较高的数据质量。这对于将来使用VIS / NIR MOS光谱通道的光谱测量值观察海洋沿海地区（浮游植物，沉积物，污染等）的全球变化至关重要。调查表明，为此目的，撒哈拉沙漠中的大东方Eastern的一部分是合适的。卫星每24天越过这个非常均匀的区域。由于良好的无云条件，我们一年可以使用6-8次飞越进行校准。表面反射率的季节性变化非常小，因此即使没有对大多数通道进行地面真相测量，我们也可以获得足够准确的相对校准数据。这种“替代”校准的趋势与先前失败的灯泡和太阳校准的趋势非常吻合。将讨论这三种方法之间的差异。在本文中，我们还将介绍SeaGreatFS和来自大东部Erg地区的可比较光谱通道的MOS数据之间的比较结果。他们还确认了该区域是否适合校准。

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