Radiometric calibration is the key of improving quality and quantitative applications of the remote sense data. A irradiance-based radiometric calibration campaign was performed by National Spaceborne Demonstration at the Erenhot test site on June 1

2007

in which Terra MODIS was the object. It showed that the irradiance-based calibration results were in good agreement with both the MODIS on-board calibration and reflectance-based calibration results with the variations less than 3.3% at the site. It was concluded that the irradiance-based calibration method was performed correctly

while the differences among the coefficients showed that the measurement of the ratio of diffuse-to-global ratio has crucial impact on results of irradiance-based calibration. The results from different aerosol modes confirmed that the irradiance-based radiometric calibration can reduce the error caused by the assumption of the aerosol mode.