798 
ATSR 
Field Measured Temperature - Estimated Temperature (Degree C) 
AVHRR 
“I I I r 
Field Measured Temperature - Estimated Temperature (Degree C) 
TM 
Field Measured Temperature • Estimated Temperature (Degree C) 
Figure 4 Differences between the brightness 
temeperatures measured in the field and those 
estimated by using Lowtran7 code for ATSR, 
AVHRR and TM data