All together 20 GCPs where measured with a LEICA GPS
System 1200 ASCOS in static mode with real time correction
values after the flight using natural points identifiable in the
images. The measurement accuracy was about 5 cm for 19 of
the measured GCPs and 50cm for a height control point. The
definition accuracy, however, was only about 10-20 cm due to
the usage of non-signalized points. In a minimum configuration
only 4 GCPs were introduced into the AT, leaving 16 check
points. A moderate configuration used 10 GCPs and 10 check
points. The results are shown in Table 4 and Table 5. The
overall results indicate that an internal accuracy of some 10cm
(corresponding to about 1.5-2 pixels) can be reached in
planimetry using a moderate number of GCPs in the aerial
triangulation. The σ0 value is about 2 pixels only, but with 4μm
still rather good. The RMS values at check points are, however,
at an unacceptable range of 1 to 3m due to the usage of natural
and not signalized points. This does require more
investigations.
All together 20 GCPs where measured with a LEICA GPSSystem 1200 ASCOS in static mode with real time correctionvalues after the flight using natural points identifiable in theimages. The measurement accuracy was about 5 cm for 19 ofthe measured GCPs and 50cm for a height control point. Thedefinition accuracy, however, was only about 10-20 cm due tothe usage of non-signalized points. In a minimum configurationonly 4 GCPs were introduced into the AT, leaving 16 checkpoints. A moderate configuration used 10 GCPs and 10 checkpoints. The results are shown in Table 4 and Table 5. Theoverall results indicate that an internal accuracy of some 10cm(corresponding to about 1.5-2 pixels) can be reached inplanimetry using a moderate number of GCPs in the aerialtriangulation. The σ0 value is about 2 pixels only, but with 4μmstill rather good. The RMS values at check points are, however,at an unacceptable range of 1 to 3m due to the usage of naturaland not signalized points. This does require moreinvestigations.
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