OAKLAND  MIDDLE  AND  OUTER  HARBORS
Area Coverage:     2.5' Longitude  x 2.25' Latitude
 

SCALE	# OF PHOTOS	PREDICTED HORIZONTAL ACCURACY
1:6,000	23	0.2 meters
1:24,000	9	0.6 meters

RICHMOND   LONG   WHARF
Area Coverage:     1.5' Longitude x 1.0' Latitude
 

SCALE	# OF PHOTOS	PREDICTED HORIZONTAL ACCURACY
1:6,000	7	0.2 meters
1:24,000	2	0.4 meters

PORT  OF   BENECIA
Area Coverage:    1' Longitude    x 1' Latitude
 

SCALE	# OF PHOTOS	PREDICTED HORIZONTAL ACCURACY
1:6,000	7	0.5 meters
1:24,000	2	not completed

The results of aerotriangulation on these three port areas are shown in the table above. For the Oakland and Richmond areas we see 0.2 meter precision from the 1:6,000 scale images and 0.4 - 0.6 meter precision from the 1:24,000 scale images. The precision of Port of Benecia was lower due to a different flight strip configuration. As this table shows, higher accuracies must factor in higher costs, requiring additional  photographs and time.