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Gu X.-F.,CAS Institute of Remote Sensing Applications | Gu X.-F.,University of Chinese Academy of Sciences | Gu X.-F.,State Environmental Protection Key Laboratory of Satellites Remote Sensing Applications | Chen X.-F.,CAS Institute of Remote Sensing Applications | And 14 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2011

In the summer 2008, Enteromorpha Prolifra broke out in Yellow Sea and East Sea on a large scale for the first time, and became a marine disaster. The authors constructed a stereoscopic monitoring system which monitored the disaster continuously, dynamically and in real time. The present paper introduced the construction of the stereoscopic monitoring system; through analyzing the spectral characteristics of Enteromorpha Prolifra and ocean water which were acquired in a field experiment, confirmed Enteromorpha Prolifra retrieval models based on multi-platform multi-sensor and multi-spectral remote sensing data, contrasted the different scale monitoring results, and analyzed the evolvement rules with time-series analysis. This system was applied to the Enteromorpha Prolifra emergency monitoring in the 29th Olympic sailing area. It was proved feasible and valuable for the Olympic safeguard. Source


Chen X.-F.,CAS Institute of Remote Sensing Applications | Chen X.-F.,University of Chinese Academy of Sciences | Gu X.-F.,CAS Institute of Remote Sensing Applications | Gu X.-F.,University of Chinese Academy of Sciences | And 10 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2011

The sea surface sunglint is caused by specular reflectance. Water is a kind of dark target with a very low reflectance, so sunglint becomes a big noise in the aerial or aerospace remote sensing images; sunglint is strongly polarized, and can be a natural standard light source for polarized sensor in-flight calibration; sunglint also can be utilized to retrieve gaseous constituents and aerosol properties. For both de-noising and being standard light source, the radiative physic parameters should be calculated accurately. First, A 3-D sea surface model was constituted according to the Cox & Munk model; Second, the polarized radiative model of sunglint was deduced based on the 3-D sea surface model and polarized Fresnel reflectance law; Third, the sensitivities of solar-viewing relative azimuth, zenith, wind speed and wind direction were analyzed utilizing the polarized radiative model. The polarization characteristics analysis of sunglint provides a theoretical basis for the quantitative remote sensing retrievals which uses sunglint. Source


Gu X.-F.,CAS Institute of Remote Sensing Applications | Gu X.-F.,University of Chinese Academy of Sciences | Gu X.-F.,State Environmental Protection Key Laboratory of Satellites Remote Sensing Applications | Chen X.-F.,CAS Institute of Remote Sensing Applications | And 13 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2011

In order to make a good use of Chinese polarized satellite sensor, the directional polarized camera (DPC) has been developed and tested in the flight experiments. DPC camera is designed to observe the polarized and directional reflected radiation of the earth-atmosphere system. Retrieval of physical parameters from DPC data depends on the accuracy of calibration. The polarized camera radiative calibration includes two aspects: intensity and polarization. Based on the predecessors' work, we explore the polarization calibration principles and methods. Using the DPC aerial remote sensing experiment data, we have realized the polarization calibration and analyzed the results. This work may contribute to fundamental basis for the data processing and in-flight calibration of the future Chinese polarized satellite sensor. © 2011 Chinese Physical Society. Source

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