In-flight absolute radiometric calibration is one of the critical techniques for quantitative remote sensing.High spatial resolution remote sensor based on large area of gray-scale tarps vicarious calibration method relies on traps BRDF

diffuse global ratio and atmospheric optical thickness measurement

the calibration approach could isolated the DN signal created by the traps from the response produced by background radiance sources

which simplify the calibration process and eliminating the assumption of aerosol scattering.Uncertainty analysis showed that the calibration uncertainty is 4.7% at present

and could improve to 3%—4% in the near future.We describe the rationale

methods

and results of a large area gray-scale tarps based vicarious calibration campaign that was conducted between July and August

2011.Through regression analysis of the observed values of the target and total irradiance of the two days

initially to determine the performance of band 3 might changed.