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Page 4 <br />William Reilly, P.E. <br />Senior Coastal Engineer <br />APTIM <br />9143 Philips Hwy, Suite 400 <br />Jacksonville, FL 32256 <br />Aerial Triangulation <br />Defined as the procedure of establishing geometric relationships among forward and side <br />lapping imagery to extend and densify supplemental horizontal and vertical control points. <br />Using the Horizontal and Vertical control survey data, and the Exterior Orientation Parameters <br />of all frames (ALPS & IMU), GPI GEOSPATIAL shall precisely perform manual and automatic <br />digital aerial triangulation using our Trimble Inpho Match -AT or ISAT software. <br />Image points will be established at the Von Gruber locations on each image and will be 3 ray <br />points except for the first and last image on each strip. <br />Appropriate XY&Z weight factors to the control points will be established based on mapping <br />scale requirements. <br />A Certified Photogrammetrist will study and approve the aerotiangulation results; a PSM signed <br />and sealed certification shall accompany the report. <br />Automatic and manual tie point matching shall be performed on the entire set of imagery to best <br />contribute to the strength and quality of the block. <br />Geo -Referenced Digital Imagery <br />Using the Exterior Orientations from the triangulation, GPI GEOSPATIAL shall perform a <br />rigorous Geo -rectification of all imagery. The high quality imagery' shall have a constant scale. A <br />tiling scheme shall be created, and all imagery shall be cut at 0. 5' pixel in TIFF formats. GPI <br />GEOSPATIAL shall use our Trimble Inpho OrthoVista to bring it all together in a seamless <br />homogeneous mosaic. OrthoVista is powerful professional mosaicking software that utilizes <br />advanced imaging techniques to automatically adjust and compensate intensity and color <br />variations, it also computes radiometric adjustments such as hot spots and lens vignetting on <br />the entire block to match the color and brightness of adjacent images. <br />Final Quality Assurance Check <br />The entire project area is put through a quality control check, in which the imagery is reviewed <br />and the final mosaicked tiles are checked against the project control points for accuracy. The <br />check will include assuring that positions of stationary objects (roads, buildings, etc.) throughout <br />the image frames align with previous aerials collected by GPI GEOSPATIAL. <br />DELIVERABLES: <br />GPI will provide 2 separate deliverables of the following for R-15-171-60 and R -1 -R -15_R -60-R-119 <br />• Individual Geo -referenced tiles in uncompressed TIFF format and associated world files <br />on DVD or thumb drive. <br />• Mosaicked Geo -referenced files in JPEG format on DVD or thumb drive. <br />GPI Geospatial, Inc. 423 South Keller Road, Suite 300 Orlando, FL 32810 p 407.851.7880 <br />An Equal Opportunity Employer <br />