Time filter

Source Type

Zhang Y.,Beijing Normal University | Zhang Y.,Center for Spaceborne Remote Sensing Demonstration | Zhang Y.,University of Chinese Academy of Sciences | Meng Q.-Y.,Beijing Normal University | And 3 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2011

The present study used the PROSAIL forward model to simulate vegetation canopy spectrum, introducing blue and green bands to amend the effects of atmosphere and soil background, and constructing HuanJing vegetation Index (HJVI) to avoid premature saturation. Based on ground observation data of different typical winter wheat, we established HJVI-LAI long time series inversion models and implemented different varieties cross-validation to the models. The results show that the LAI inversion model of HJVI has higher precision than similar vegetation index model, has good universality, and can be applied to remote sensing multi-temporal winter wheat growth monitoring and LAI inversion.


Gao H.,CAS Institute of Remote Sensing Applications | Gao H.,University of Chinese Academy of Sciences | Gao H.,Center for Spaceborne Remote Sensing Demonstration | Gu X.,CAS Institute of Remote Sensing Applications | And 12 more authors.
Acta Geodaetica et Cartographica Sinica | Year: 2011

The sensor on satellite is usually attenuated because of the intense ultraviolet radiance and cold space environment at the top of atmosphere. Three methods had been used to calibrate the CBERS02B CCD Camera in time series, which were desert sense calibration method, pseudo-invariance target calibration method and cross-calibration method, and the CBERS02B CCD calibration coefficients of three methods during 2007-2008 had been calculated. The relative differences of three methods' calibration coefficients were less than 10%. Further more, CBERS02B official calibration coefficient was used to validate the precision of three methods' calibration coefficients and the results were very ideal. In the end, the advantage and disadvantage of time series calibration method were analyzed, which would be useful for other similar satellites in future.

Loading Center for Spaceborne Remote Sensing Demonstration collaborators
Loading Center for Spaceborne Remote Sensing Demonstration collaborators