Conversely, the PG data habitually only produced small, 
random errors with a range of approximately 0.5 pixels. The 
resulting small sigma value is typical of a tightly clustered 
error pattern and one that is predictable and may be 
calibrated. 
It is therefore advisable that any use of NPG scanners, 
including high performance graphic arts units, be limited to 
work only requiring qualitative products. ^ There use in 
producing photogrammetric products is strongly cautioned 
and quantified in this paper. 
aternational Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part Bl. Istanbul 2004 
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