Study on CBERS-2’s CCD Image Cross Calibration and Atmospheric Correction

Study on CBERS-2’s CCD Image Cross Calibration and Atmospheric Correction

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Peng Guangxiong
Beijing Normal University,
China
Email: [email protected]

Shen Wei
Beijing Normal University
Email: [email protected]

LIJing
Professor
Beijing Normal University

H.U Deyong
Beijing Normal University

H.E Yuhua
Professor
China Land Survey and Planning Institute

Tay Lip Hong, Engineer, Cilix Corp. Sdn. Bhd., Technology Park Malaysia

CBERS-2 is the second earth resources satellite of China. The spatial resolution of CCD images is 20 m. Due to the distortions and noises from the presence of the atmosphere on the Sun-target-Sensor path, the space-based and airborne remote sensing information in the solar spectral range do not directly characterize the surface objects. It becomes serious impediment for the quantitative analysis and measurement of resources and environment. This paper provides a group of reference calibration coefficients for CBERS-2’s CCD data by using cross calibration method based on the LANDSAT-5 TM data. The validation of the cross calibrated result shows its feasibility. A method which is based on 6S (Second Simulation of Satellite Signal in the Solar Spectrum) and isochronous meteorological information on sensing time, are used to carry out atmospheric correction of CBERS-2’s CCD 4 bands. Sensitivity analysis is conducted by comparisons of corrected and uncorrected reflectance data including normalized vegetation index (NDVI). It was found that corrected reflectance of CCD3 and CCD4 increased obviously and the NDVI of vegetation area ascended while the NDVI of nonvegetation areas descended. The research proves that 6S atmospheric simulation model reduces the uncertainties in the process of electromagnetic wave transmission and eliminates the perturbation from geometric and system corrected remote sensing imagery effectively.
KEY WORDS: CBERS-2 CCD data; Cross Calibration; Atmospheric Correction; 6S model