The scanned images (14 micron), ABGPS data, ground checkpoint data, and camera calibration data were used as inputs to the Zeiss/Intergraph ImageStation Automatic Triangulation (ISAT) softcopy program. ISAT correlated image points and aerotriangulated the block of images to create exposure station exterior orientations. Lens distortion, atmospheric refraction, and earth curvature were taken in to account during the aerotriangulation process. Thirty-three USGS provided ground checkpoints were manually measured on the imagery. These ground checkpoints were included in the aerotriangulation adjustment as unconstrained points for absolute ground location verification.
The scale of the aerial photos was 1 inch = 1800 feet. Two Zeiss RMK Top 15 cameras were used. The focal length was 153.048 mm for photography taken on 4/4/05 and 5/4/05 and 152.826 mm for photography taken on 4/8/05 and 4/14/05.
Rectification was done using the aerotriangulation data, scans, and 30 meter DEM data provided by the county. These rectified images were used to draw seamlines. The images were then dodged. The dodged rectified images were mosaicked, balanced, and cut into final image sheets. The final sheets were viewed and artifacts were removed as well as other edits performed."