Furthermore, geographic features were then identified and extracted from both sets of images using the Integrated Digital Photogrammetric Facility (IDPF) a configuration of analytical Stereo plotters, computer hardware and software components, and other associated peripheral devices. The collected vectors from both data sets were then plotted on manuscripts with identical scales in order to display the differences between the two. Click here to view the images.

In June 1999, field survey operations were conducted at Richmond Wharf. Surveyors measured precise ground positions of the outer perimeter wharf corners by using both GPS and conventional methods.  These survey ground positions will be compared with the 1:24,000 and the 1:6,000 scale positions giving us a better assessment of the accuracies involved between the two data sets. For additional information on the survey operations and the results, click here.