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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B1. Istanbul 2004 
4. CONCLUSION 
An original approach for on-orbit spatial resolution assessment 
performance has been described. The method uses on-orbit data 
of the Pontchartrain Causeway Bridge in Louisiana and Rio- 
Niteroi Bridge in Rio de Janeiro. The main idea is to find the 
best fit between the image measurements and the simulated 
data. The results show that the spatial resolution in across-track 
direction does not conform to the specifications for any bands, 
while spatial resolution in the along-track directions meets the 
specifications for all bands except band 4. The low spatial 
resolution observed in across-track direction for bands 1, 2 and 
3 was not observed on MTF measurements performed in 
laboratory. This degradation could be explained by the presence 
of mirror vibration when both sensors IRMSS and CCD work 
simultaneously. Besides this hypothesis, the observed 
degradation could be the result of an electronic joining between 
adjacent detectors. On the other hand, degradation verified for 
band 4 was expected due to problems in the CCD camera 
assembly. 
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