On accuracy of radiometric calibration of hyperspectral visible/NIR satellite remote sensing instruments above natural surfaces

摘要: To provide accurate data the regular on-board absolute radiometric calibration of a satellite hyperspectral instrument is required. Together with internal external using comparison radiance measurements above special ground test sites and calculated radiances performed. The top atmosphere are radiative transfer model basing on atmospheric surface characteristics measured at sites. Spatial pixel instruments tens meters, therefore it difficult to creation large enough fields artificial reflective surface. paper presents preliminary results theoretical analysis errors grass snow. Results for located 200 m.a.s.l. 2000 composition reflectance compared. performed an spectral resolution 1-8 nm which typical regime payload GSA Russian Resurs-P. related albedo measurement scenarios aerosol vertical distribution were theoretically examined. error less than 6% in all cases wavelengths between 400 1000 exception absorption bands water vapor. In vapor about 720 820 reach 12% downcountry site. band 950 15% mountains 35% downcountry. our we used 4% albedo. We can expect that reassessment natural surfaces will directly influence estimation total both end snow except range 400-650 where has low