Aero-Metric, Inc 20080308 Digital Point Data The purpose of this data set is to provide a source for current and accurate digital elevation models (DEM) with a planned vertical accuracy of 0.25 meters (according to Optech specifications) or better and with each line flown with a planned nominal point spacing of 2.079 meters. The project area was collected with 50 percent sidelap, yielding a planned overall point spacing of approximately 1.040 meters. A DEM is used as a fundamental layer of information in Geographic Information Systems (GIS). A number of the priority layers of spatial information recognized by the National Spatial Data Infrastructure may be derived from LIDAR DEM's, including elevation, hydrography, slope, aspect, and shoreline delineation. This data is not recommended for design grade mapping or engineering without a ground truth survey. These LIDAR data sets are generated using an Optech ALTM Gemini LIDAR data acquisition system mounted onboard Aero-Metric Inc's twin-engine Cessna 320 (N3443Q) aircraft. Classified data sets such as this one may have varying posting due to some LIDAR pulses not reaching the ground. The Valdez project datum is NAD83(CORS96) EPOCH 2003.000, Universal Transverse Mercator (UTM) Zone 6, meters. The vertical datum is Geoid06(Alaska) derived Orthometric heights, in meters. Accuracy statements are based on areas of moderate terrain. Diminished accuracies are to be expected in areas of extreme terrain and dense vegetation. The accuracy of each point is expected to meet the vertical accuracy standard however, derived products may be less accurate in areas of extreme terrain and dense vegetation due to a lesser number of points defining the bare-earth in these areas. The bare earth data set contains the points that were classified as bare-earth. This means that the data represents the last surface the beam encountered, where that surface is assumed to be ground. As such, these data should represent the actual surface of the earth. Data anomalies such as pulses that encountered birds or interacted with atmospheric features have been re-classified to non-deliverable classes. 1st_return data sets contain the points that were identified as the 1st return from each laser pulse back to the aircraft. Generally speaking, this means that the data represent the first surface the beam encountered, frequently buildings and vegetation in addition to those areas where both first and last return are on the ground. As such these data may not represent the actual surface of the earth, but features that exist on the ground and above the earth's surface. Data anomalies such as pulses that encountered birds or interacted with atmospheric features have been removed. All other data sets contain the points that were identified as all other pulses that were not classified as bare earth. As such these data may not represent the actual surface of the earth, but features that exist on the ground and above the earth's surface. Data anomalies such as pulses that encountered birds or interacted with atmospheric features have been removed. The purpose of calibration is to verify the sensor’s operational status and compute any misalignment angles between the sensor and the Inertial Measurement Unit (IMU). The IMU is responsible for collecting the roll, pitch and heading of the sensor during acquisition, and slight variations in alignment can cause inaccuracies in the data collected. The system was calibrated over the Glenn Highway along the Palmer Hay Flats, located in Palmer Alaska. This area was chosen because of its open unvegetated landscape and flat terrain. Open terrain allows the majority of the first return points to be representative of the ground surface, creating a consistent calibration surface. The area was also surveyed by Aero-Metric, Inc. to verify the location of the ground surface. Real-Time Kinematic (RTK) GPS techniques were used in the collection of 811 ground truth points, throughout the paved surface of the calibration area. The LIDAR data was acquired using a perpendicular flight line pattern, at the following pulse frequency and altitudes above ground. 33 kHz – 3700 and 2000 meters After acquisition these data were post-processed utilizing Optech's DASHMap (version 1.0025) software, which first computes a 2 Hz post processed kinematic (PPK) DGPS trajectory, then applies the 200 Hz IMU data for a final smoothed best estimated trajectory (SBET). This SBET is then integrated with the LIDAR pulse data, for a final point cloud dataset in .LAS format. These data were classified to bare-earth using TerraSolid's TerraScan (Version 006.008) software in a Microstation V8 (Version.08.01.02.15) CAD environment. These data were then post-processed in TerraSolid's TerraMatch (Version 006.005). This software computes recommended corrections for heading, roll, pitch and mirror scale. These corrections are then applied to the original data using DASHMap. The newly processed data is then verified again using TerraMatch. If the computed corrections are minimal, the LIDAR is calibrated properly. For final verification the LIDAR data is compared to the ground truth data, confirming absolute accuracy. Val-1 and Val-2 positions were computed using OPUS and were used as a basis of airborne control along with POT 5 (NGS-CORS). The Aero-Metric, Inc. QC data was collected on October 26th-27th, 2006. The RTK collection was done simultaneously with another project surveyed in 2006 A total of 2914 QC points were collected by Aero-Metric, Inc. Maximum Project Distance 41.18 Km, Project Average baseline Length 17.257 Km. 20080308 ground condition Complete Unknown None Elevation Cartography Geodesy Geography Hydrography Mapping Photogrammetry Stereophotogrammetry Topography Radar Interferometric Remote Sensing LIDAR Laser DEM DTM DSM Terrain Height None USA Anchorage Alaska Glenn Highway Palmer Alaska Richardson Highway Valdez None Terrain Earth Surface Bald Ground None October 2007 Purchase License Agreement Aero-Metric, Inc. Robert T. Thomason Jr. LIDAR Production Manager mailing and physical address

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Anchorage Alaska 99501-4116 USA 907-272-4495 907-274-3265 thomason@aerometric-ak.com 8:00 am to 5:00 pm Alaska Time Recognition of those who contributed to the data set. Aero-Metric, Inc. LIDAR group: Robert T. Thomason Jr. (Compiler), Richard Trautmann (Compiler), Jacques Cloutier (Senior Geodetic Surveyor), James R. Sprung (Editor) , Gennady Khokhorin (Programmer), Clifford Everingham (Editor), Dale Roark (Pilot), Glen Morthorpe (Pilot), Nicholas Czechowicz (Sensor Operator). Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; lidarTools 1.0.8 Aero-Metric, Inc 20080219 Digital Point Data Quality control and assurance procedures are initiated and completed. Complete The LIDAR data was acquired at 3800 meters Above Mean Terrain (AMT). These data have a planned horizontal accuracy of 0.25 meters RMSE or better, with an nominal point spacing of 1.040 meters. These data have a vertical accuracy of 0.25 meters RMSE or better. Aero-Metric, Inc. 20080308 vector digital data Anchorage, Alaska, USA Aero-Metric, Inc. External hard drive (MAXTOR) 20080308 ground condition LIDAR DEM D:\WORK_DIRECTORY\6070828_Valdez\META_DATA_FINAL\FGDC_MetaData_ALL_RTNS_LAS\0001.las The raw data points for the DEM data product were captured using Aero-Metric, Inc's twin engine Cessna 320 (N3443Q) aircraft equipped with an Optech ALTM Gemini LIDAR data acquisition system operating at a 33 kHz repetition rate. The system's position and orientation are provided by a differential GPS (DGPS) and an inertial measurement unit (IMU). These data were post-processed utilizing Optech's REALM (Version 1.0025) software, which first computes a 2 Hz Post Processed Kinematic (PPK) DGPS trajectory, then integrates the 200 Hz inertial measurement unit (IMU) data for a final smoothed best estimate of trajectory (SBET) This SBET is then integrated with the LIDAR pulse data, for a final x,y,z "point cloud" dataset in industry standard .LAS format. These LIDAR data were then "classified" using TerraSolid's TerraScan (Version 1.0025) software in a Microstation V8 (Version 09.01.02.15) CAD environment. Classification of the bare earth is done by running algorithms in TerraScan that re-classify the LIDAR data to bare earth. These data were then post-processed in TerraSolid's TerraMatch (version 006.005). This software computes recommended corrections for heading, roll, pitch and mirror scale and applies those corrections to the data, assuring the most accurate data possible. These data were then put through a rigorous manual edit. Aero-Metric, Inc. collected quality assurance and quality control (QAQC) data for this project. The QAQC data was provided in UTM Zone 6 and ellipsoidal heights, in meters. These data were then used to create a TerraScan output control report (OCR) in order to verify the initial LIDAR bare earth data. This routine searches the LIDAR dataset by X & Y coordinate, finds the closest LIDAR point and compares the vertical (Z) values to the known data collected in the field. The LIDAR data was shifted +0.06 meters for the first lift and 0.242 meters for the second lift, along the Z-axis, to correspond with the QAQC data. These two lifts where merged together after the bias adjustment was applied. GEOID06 (Alaska) was then applied to the vertical component of the LIDAR data, using "LIDAR Tools" (Version 1.0.8.1358) developed by Aero-Metric, Inc. A final OCR was computed to verify the conversion to the deliverable datum. These results were then brought into Microsoft Excel (Version 9.06927 SP-3) where a statistical analysis was performed. This report can be viewed in the files Valdez_Road_Profile_UTM6m_G06_PENZ_Results.xls and the resulting statistical analysis yielded a RMSE of 0.101 meter. Using TerraScan these LIDAR data were then trimmed to the project boundary. For the Final deliverable these data where output All returns in .LAS format, All returns in C,X,Y,Z comma delimited format, Bare earth in a 0.3 meter grid X,Y,Z comma delimited format, 1st return in a 1.4 meter grid X,Y,Z comma delimited format, Bare earth in X,Y,Z comma delimited format, and 1st return XYI Arcinfo format. 20080219 Robert T. Thomason Jr. Aero-Metric, Inc. LIDAR Production Manager mailing and physical address

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Anchorage Alaska 99501-4116 USA 907-272-4495 907-274-3265 thomason@aerometric-ak.com 8:00 am to 5:00 pm Alaska Time Metadata updated for Bounding coordinates, Spatial Reference info using FGDC template D:\WORK_DIRECTORY\6070828_Valdez\META_DATA_FINAL\Valdez_Template.xml 20080308 D:\WORK_DIRECTORY\6070828_Valdez\META_DATA_FINAL\FGDC_MetaData_ALL_RTNS_LAS\fgdcMetadata\0001.xml Universal Transverse Mercator 6 0.999600 -147.0 0.0 500000.0 0.0 coordinate pair 0.000001 0.000001 meters North American Datum of 1983(CORS96) EPOCH 2003.0000 Geodetic Reference System 80 6378137.000000 298.257222 GEOID06 (Alaska) Orthometric Heights 0.000001 meters Explicit elevation coordinate included with horizontal coordinates LAS 'LAS' ASPRS binary data D:\WORK_DIRECTORY\6070828_Valdez\META_DATA_FINAL\FGDC_MetaData_ALL_RTNS_LAS\0001.las C1=32 class 1, number of XYZ points for the first LIDAR pulse return C2=19 class 2, number of XYZ points for the second LIDAR pulse return C3=1 class 3, number of XYZ points for the third LIDAR pulse return C5=42 class 5, number of XYZ points classified as Bare Earth Aero-Metric, Inc. Robert T. Thomason Jr. LIDAR Production Manager mailing and physical address

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Anchorage Alaska 99501-4116 USA 907-272-4495 907-274-3265 thomason@aerometric-ak.com 8:00 am to 5:00 pm Alaska Time Aero-Metric, Inc. assumes no liability for the data being used for purposes other than stated in this document. 20080308 Aero-Metric, Inc. Robert T. Thomason Jr. LIDAR Production Manager mailing and physical address

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Anchorage Alaska 99501-4116 907-272-4495 907-274-3265 thomason@aerometric-ak.com FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time Point Point 94