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首页> 外文会议>Remote Sensing of the Marine Environment; Proceedings of SPIE-The International Society for Optical Engineering; vol.6406 >Evaluation of the CMODIS-measured radiance
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Evaluation of the CMODIS-measured radiance

机译：评估CMODIS测量的辐射度

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A Chinese Moderate Resolution Imaging Spectrometer (CMODIS) on "Shenzhou-3" spaceship was launched on March 25, 2002. CMODIS has 34 channels, with 30 visible and near-infrared channels and 4 infrared channels. The 30 channels are 20nm width with wavelength ranging from 403nm to 1023nm. The radiance calibration of CMODIS was finished in the laboratory measurements before it was launched and the laboratory calibration coefficients were used to calibrate the CMODIS raw data. Since none of on-board radiance absolute calibration devices including internal lamps system and calibration system which is based on solar reflectance and lunar irradiance were installed with the sensor, how about the accuracy of CMODIS-measured radiance is a key question for the remote sensing data processing and ocean applications. A new model was developed as a program to evaluate the accuracy of calibrated radiance measured by CMODIS at the top of the atmosphere (TOA). The program can compute the Rayleigh scattering radiance and aerosol scattering radiance together with the radiance component from the water-leaving radiance to deduce the total radiance at TOA under some similar observation conditions of CMODIS. Both the multiple-scattering effects and atmosphere absorbing effects are taken into account on the radiative transfer model to improve the accuracy of atmospheric scattering radiances. The model was used to deduce the spectral radiances at TOA and compared with the radiances measured by Sea-viewing Wide Field-of-view Sensor (SeaWiFS) to check the performance of the model, showing that the spectral radiances from the model with small differences from those of SeaWiFS. The spectral radiances of the model can be taken as reference values to evaluate the accuracy of CMODIS calibrated radiance. The relative differences of the two radiances are large from 16% to 300%, especially for CMODIS at the near-infrared channels with more than one time larger than those of the model. It is shown that the calibration coefficients from the laboratory measurements are not reliable and the radiance of CMODIS needs to be recalibrated before the data are used for oceanography applications. The results show that the model is effective in evaluating the CMODIS sensor and easily to be modified to evaluate other kinds of ocean color satellite sensors.
机译：2002年3月25日，在“神舟3号”飞船上发射了中国中分辨率成像光谱仪（CMODIS）。CMODIS具有34个通道，其中包括30个可见和近红外通道以及4个红外通道。 30个通道的宽度为20nm，波长范围为403nm至1023nm。 CMODIS的辐射校准在发射之前已在实验室测量中完成，并使用实验室校准系数来校准CMODIS原始数据。由于传感器没有安装任何车载辐射绝对校准设备，包括内部照明系统和基于太阳反射率和月球辐照度的校准系统，因此，CMODIS测量的辐射精度如何是遥感数据的关键问题加工和海洋应用。开发了一个新模型作为程序，以评估由CMODIS在大气层顶部（TOA）测量的校准辐射的准确性。该程序可以计算出瑞利散射辐射和气溶胶散射辐射，并结合出水辐射的辐射分量计算出在CMODIS相似观测条件下TOA的总辐射。在辐射传递模型中考虑了多重散射效应和大气吸收效应，以提高大气散射辐射的准确性。该模型用于推导TOA的光谱辐射度，并与海景宽视场传感器（SeaWiFS）测量的辐射度进行比较，以检查模型的性能，表明该模型的光谱辐射度差异很小从SeaWiFS。模型的光谱辐射度可以作为参考值，以评估CMODIS校准辐射度的准确性。两种辐射的相对差异从16％到300％很大，尤其是对于近红外通道的CMODIS，其比模型大一倍以上。结果表明，实验室测量的校准系数不可靠，在将数据用于海洋学应用之前，需要重新校准CMODIS的辐射。结果表明，该模型在评估CMODIS传感器方面是有效的，并且易于修改以评估其他种类的海洋彩色卫星传感器。

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