2007 Palm Beach County Mapping Digital Orthorectified photos and Mosaics of 1:10000 scale natural color aerial photography were created. Imagery was flown on June 20 & 22, July 21, and August 4 & 8, 2007. Additionally, there was 1:4800 scale natural color aerial photography flown on July 1, 2007. The imagery that was flown on June 20 & 22, July 21, and August 4, 2007 included the ICW and Lake Worth Lagoon system throughout Palm Beach County south of Jupiter Inlet. The imagery that was flown on August 8, 2007 was for the area around Jupiter Inlet and southern Jupiter Sound. The 1:4800 scale imagery flown July 1, 2007 covered the mouth of the Loxahatchee River and west around the start of the Lake Worth Creek. Photograpy for the project was orthorectified on Avineon's ImageStation Stereo software; an aerotriangulation solution was computed across the project area, using ImageStation Automatic Triangulation (ISAT) software issued by Z/I Imaging, Inc. Utilizing GPS coordinates of the center of photography, camera calibration reports and the raw scans of photography, ISAT created a solution that meets the National Map Accuracy Standards for 1:24,000 scale maps. The GPS photo centerpoint data and existing ground control was utilized as the control for creation of the aerotriangulation solution. Upon completion of the aerotriangulation solution, checkpoints were derived from USGS DOQQs to check the spatial accuracy of the triangulation solution.
Upon completion and quality assurance acceptance of the aerotriangulation solution, the adjusted control points and camera orientation parameters were used to set up the stereo models for photointerpretation within soft copy photogrammetric workstations.
Raw images were color balanced using I/RASC and a new look-up table was applied to images before saving to a new file. This balance process was completed to correct a green saturation that occured during the scanning process.
The orthophotography process was performed using an automated batch process. By using the raw imagery in combination with the aerotriangulation results described above, our softcopy system generated a digital ortho to a specified pixel size. Two copies of orthos were produced, pixel resolution was set at 1/2 foot and two feet.