周科等：Sensitivity Analysis of Spectral Band Adjustment Factors For GF-1/WFV Sensor Cross-Calibration

作者:Zhou, K (Zhou Ke)[ 1,2,3,4,6 ] ; Liu, L (Liu Li)[ 5 ] ; Yu, T (Yu Tao)[ 1,2,4 ] ; Gu, XF (Gu Xing-fa)[ 1,2,4 ] ; Zheng, FB (Zheng Feng-bin)[ 6 ] ; Zang, WQ (Zang Wen-qian)[ 1,2,4 ]

SPECTROSCOPY AND SPECTRAL ANALYSIS

卷: 37  期: 12  页: 3809-3813

DOI: 10.3964/j.issn.1000-0593(2017)12-3809-05

出版年: DEC 2017

摘要

Affected by the components aging and the space environment changing, the radiation performance of the first satellite GaoFen series (GF-1) changes since it has been launched. The orbit calibration can track the performance changing during the sensor's lifetime. Cross calibration using the high radiometric calibration precision can improve the calibration frequency and accuracy. Spectral band adjustment factors (SBAF) are important factors in cross calibration. Terra/MODIS is selected as reference sensor, GF-1/WFV as target sensor, and the SBAF can be calculated based on the in situ measurement spectral data at Dunhuang radiometric calibration site, considering the observation angle, spectral response, atmospheric conditions and surface properties. Time series cross calibration coefficients can be obtained according to the SBAF. GF-1/WFV apparent radiances are obtained by the cross calibration coefficients, while Terra/MODIS apparent radiances are obtained by the digital number and calibration coefficients. The relative deviations of apparent radiances between the two sensor's are compared by analysis. It shows that SBAF in different bands has same trends; The SBAF above 0. 9 are 53. 1%, 75%, 81. 2%, 93. 8% for blue, green, red, near-infrared bands, respectively; Time series calibration coefficients and SBAF are negatively correlated and the relative deviations of apparent radiances are smaller while the SBAF are closer to 1.

通讯作者地址: Liu, L (通讯作者)

       China Ctr Resources Satellite Data & Applicat, Beijing 100094, Peoples R China.

地址:

[ 1 ] Chinese Acad Sci, Jointly Sponsored Inst Remote Sensing & Digital E, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China

[ 2 ] Beijing Normal Univ, Beijing 100101, Peoples R China

[ 3 ] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[ 4 ] Ctr Natl Spaceborne Demonstrat, Beijing 100101, Peoples R China

[ 5 ] China Ctr Resources Satellite Data & Applicat, Beijing 100094, Peoples R China

[ 6 ] Henan Univ, Coll Comp & Informat Engn, Kaifeng 475004, Peoples R China