采用自动化场地辐射计（ATR）测量地表反射，结合CE318型太阳光度计获得的大气参数和漫总比辐照度仪获得的漫总比数据，计算出卫星过顶时刻的高光谱地表反射率。基于反射率基法对中分辨率成像光谱仪(MODIS)/Aqua和MODIS/Terra的可见光至近红外波段1~7开展了场地自动化观测绝对辐射定标试验。结果表明，利用场地自动化观测定标方法获取的表观辐亮度与MODIS/Aqua、MODIS/Terra星上获取的表观(TOA)辐亮度的相对偏差不大于4%。这说明场地自动化观测定标方法与人工定标方法具有同等水平的定标精度，验证了场地自动化观测定标方法的可行性。

By means of measuring the surface reflectance by an automated test-site radiometer (ATR), measuring the atmospheric parameters by CE318 sun-photometer, and measuring the diffuser-to-globe factor by the diffuser-to-globe irradiance meter, a hyperspectral surface reflectance at the time of overpass is determined. Based on the reflectance-based method, absolute radiometric calibration experiments with in-site automated observation at visible to near-infrared bands 1-7 of the moderate resolution imaging spectroradiometer (MODIS)/Aqua and MODIS/Terra are performed. The results show that the relative deviation in top-of-atmosphere (TOA) spectral radiances is less than 4% obtained from the in-site automated observation radiometric calibration (AORC) method and from MODIS/Aqua and MODIS/Terra, which indicates the in-site AORC method is at the same level of calibration accuracy with the manual calibration methods. The feasibility of the in-site AORC method is testified.