Ja. Valiente et al., NARROW-BAND TO BROAD-BAND CONVERSION FOR METEOSAT-VISIBLE CHANNEL ANDBROAD-BAND ALBEDO USING BOTH AVHRR-1 AND AVHRR-2 CHANNELS, International journal of remote sensing, 16(6), 1995, pp. 1147-1166
Satellite-derived broad-band albedo offers a useful tool for monitorin
g surface conditions. Given the limited wavelength window of most sate
llite radiometers, satellite albedo studies need to define narrow-band
to a broad-band transformations. Signals from the AVHRR channels on b
oard the NOAA-11 satellite, the Meteosat visible channel and a rectang
ular spectral band from 0.3 to 2.5 mu m were simulated for a set of 20
representative land surfaces. The radiative transfer code described i
n Tanre: er al. (1990) was used to obtain top of the atmosphere radian
ces. The derived signals were then correlated to predict broadband alb
edo and the Meteosat response via the two AVHRR signals. The results i
ndicated that the use of the two AVHRR bands makes the narrow-band to
broad-band conversion independent of the surface type. Finally, the re
gression was applied to two concurrent AVHRR and Meteosat images so as
to compare a broad-band AVHRR-derived top of the atmosphere (TOA) alb
edo for the Meteosat-band with a corresponding TOA albedo from Meteosa
t data. The results of the comparison illustrated the anisotropic char
acter of surface reflection.