C.I. = 5 Ft.
Figure 2
Contour Map Produced from Stereoplotter DTM
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Figure 3
Contour Map Produced from Automatically Generated DTM
In the next test the cross and circular panels were located
in the Mazomaine photography by the automatic panel recogni
tion process. Also an attempt was made to locate the pug
holes by the same process. However, the 80 micrometer pug
holes were too small for the 50 micrometer pixel size and
only a few were located. This provided insufficient data
for a scanner calibration and the process will have to be
repeated with larger pug holes or smaller pixel size.
Tables 1 and 2 show the discrepancies between the automati
cally derived coordinates and the monocomparator measured
values for two photos of the Mazomanie photography.
Virtually all of the points were located to sub-pixel
levels. Since the direction of drum rotation was parallel
tr H