Optical characteristics of China Radiometric Calibration Site for Remote Sensing Satellite Sensors (CRCSRSSS)

Duhuang site and Qinghai Lake site are selected to be China Radiation calibration site for Remote Sensing Satellite Sensors in 1996. We have conducted three field measurement campaigns in 1994, 1996 and 1999 and obtained a lot of characteristic data of atmosphere and ground reflectance. The results show that the Duhuang site has a good homogeneity with a low standard deviation of the reflectance which is less than 2 percent at VIS-SWIR range in 20 by 20 km2. The ground reflectance is between 10 percent and 35 percent at 0.35-2.5micrometers spectral range. Atmosphere measurement have shown that Aerosol optical depth at 550nm in two sites is 0.125 and 0.18, which are all small and suitable for in-flight calibration atmosphere condition. The result of Junge aerosol parameter indicate aerosol type in Duhuang is near to desert model and near to continent model in Qinghai Lake. The columnar water vapor is determined by Modified Langley plot approach in 940nm band of sun photometer. The results of it are compared with radiosonde data and different within 10 percent. The diffuse-to-global irradiance ratio by OL754 spectro radiometer is used for the irradiance-based calibration method to improve in-flight sensor calibration accuracy.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.