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Page 2 of 7 Pacific International Engineering Maple River- Phase I Proposal July 18, 2003 Aerial Photo~lraph¥ Specifications Flight Height (Above Mean Terrain) 5,100' Photo Scale 1"=850' Film Type B&W Number of Flight Lines 12 Number of Exposures 287 Number of Stereo Models 275 Additional Equipment Requirements ABGPS - LiDARAcquisition - We will obtain LiDAR (Light Detection and Ranging) elevation data on this project utilizing our LH Systems ALS40 LiDAR system. The LiDAR data will provide an elevation model for the project mapping area. LiDAR Specifications Flight Height (Above Mean Terrain) 8,000' Field of View 35 degrees Collection Mode 3+3 Number of Flight Lines 18 Number of Flight Line Miles 269 Swath Width 5045' Line Spacing 3532' Maximum Along Track Spacing 3.89 meters Maximum Cross Track Spacing 3.4 meters Estimated Number of Elevation Points 17.8 million Number of Basestation Locations 1 LiDAR Calibration Test Site Horizons, Inc. will establish a calibration site at an airport close to the project. This site will contain our basestation and five to six additional ground surveyed locations. This area is flown in parallel and cross flight to provide information on minor adjustments to the recordings of the LiDAR and IMU instrumentation during the pre-processing stage. Horizons' staff will provide the survey services at the calibration site with the exception of the basestation survey. Inertial Measurement Unit Technolo.qy The IMU (Inertial Measurement Unit) technology applied in Horizons' LiDAR operations is integrated with GPS technology. This equipment measures the dynamic movements of the sensor. Accelerometers and gyros within the IMU provide data regarding forward motion, ' yaw', 'pitch', and 'roll'. When combined with the differentially corrected GPS positional information, all required information is in place to provide accurate X, Y, Z coordinates of each laser pulse.