Field measurement of Gobi surface emissivity using CE312 and Infragold Board at Dunhuang calibration site of China

In this paper, we describe the methodology and field experimentations of measuring the Gobi surface emissivity using CE312 and infragold board at Dunhuang radiometric calibration site of China. The radiance of the land surface and infragold board were measured by CE312, and calculated the land surface emissivity. Then we performed atmospheric correction including gas absorption and path radiance which calculated with atmospheric radiative transfer code MODTRAN 4.0; predict the radiance at the satellite sensor entrance pupil. Inversion the TOA brightness temperature measured by the satellites and compared with the land surface brightness temperature, which obtained from the land surface physical temperature divided by the calculated emissivity. The results showed that the methodology described in this paper for measuring the Gobi surface emissivity is feasible and with a tolerable accuracy.