Image-Based Atmospheric Radiation Correction and Reflectance Retrieval Methods

The image-based atmospheric radiation correction and reflectance retrieval approach were developed using the SPOT HRY data from La Crau radiant calibration site in July 1995. The approach was based on DOS method to calculate the path radiance with the reasonable dark-object reflectance choice. The atmospheric transmittances, the downwelling atmospheric irradiance and atmospheric attenuation were inferred from several atmospheric radiative transfer codes (Lowtran-7, Modtran-3, 6S) with simulated atmosphere. At last the approach was evaluated by comparing surface reflectances measured from La Crau site with that derived from SPOT data