Aero-Metric, Inc. 20091221 1.0 digital point data This delivery contains point cloud data in LAS 1.2 format, classified in the following manner. Class 1: Unclassified, Class 2: Ground, Class 129: Overlap (Bit Withheld). The timestamps are in absolute GPS time minus 1 billion, in accordance with the LAS 1.2 documentation. The following are the collection parameters and equipment used to create these data sets. Aircraft: Piper Navajo (N6GR) Lidar System: Optech ALTM Gemini (03SEN145) Approximate Collection Altitude (Above Mean Terrain): 3800 meters Ground Speed: 160 kts Pulse Rate Frequency: 33 kHz Mirror Scan Frequency: 18 Hz Scan Angle (+/-): 16 degrees Beam Divergence: Narrow (0.25 mrad) Scan Cutoff: 0.02 degrees Accuracy statements are based on areas of moderate terrain, with points classified as ground. 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, derived products may be less accurate in areas of extreme terrain and dense vegetation due to a lesser number of points defining the ground in these areas. Classified data sets such as this one may have varying posting due to some pulses not reaching the ground. The purpose of this data set is to provide bare-earth processed lidar data over the project area Southwest of Fort Yukon, at an average point spacing of 2.3 meters. 20090714 20090715 20090716 20090722 20090903 ground condition Complete None Planned -146.7406516919 -145.0332230056 66.5927291214 65.7547820007 None Elevation Topography Remote Sensing Lidar Laser Terrain Bare-Earth None USA Alaska Fort Yukon None Class 1: Default Class 2: Ground Class 129: Overlap (Bit Withheld) None July September 2009 Public None Aero-Metric, Inc. Jacques Cloutier Senior Geodetic Surveyor mailing and physical address

2014 Merrill Field Drive

Anchorage Alaska 99501-4116 USA (907) 272-4495 (907) 274-3265 aerometric@aerometric-ak.com 8:00 am to 5:00 pm Alaska Standard Time Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; lidarTools 1.0.9 Data has been verified using surveyed check points around the Fort Yukon Airport within the project area. All data was collected to meet the National Standard for Spatial Database Accuracy (NSSDA). Complete All these data products were acquired at 3800 meters above mean terrain (AMT) and have a horizontal accuracy of 1.15 meters, with a nominal point spacing of 2.3 meters as per manufacturer's specifications, not field verified. These values were computed by verifying the ground classified lidar data against ground surveyed points at the Fort Yukon airport. The points were collected throughout the project area by John Seibert of Pro Survey Services. We recommend additional ground truth surveys of the data set to verify the vertical accuracy has not changed due to natural causes, such as techtonic motion or freeze/thaw cycles, and non-natural causes such as road construction. Without ground truth survey checks this data is not recommended for design grade mapping or engineering. 0.10 meters Consolidated vertical accuracy at the 95th percentile along road and runway surfaces. Aero-Metric, Inc. 20091221 1.0 digital point data Anchorage, Alaska Aero-Metric, Inc. YFL Aero-Metric, Inc. is responsible for the collection and processing of the lidar data used for this project lidar 20090714 20090715 20090716 20090722 20090903 ground condition Create a smoothed-best estimated trajectory (SBET) of the sensor at a rate of 200 Hz, by integrating the airborne GPS and IMU data The basis of the GPS coordinates were established using OPUS, and were referenced to NAD83 (CORS96) with ellipsoidal heights. The mean GPS positional accuracy for this area was +/- 0.08 meters. 20090715-20090906 Integrate SBET and raw laser data to produce point cloud data in LAS 1.2 format for each flight line. 20090717-20090907 Compute the roll, pitch, heading, and mirror scale correction factors for each flight line, then apply corrections to the corresponding flight line. 20090801-20090914 Automated classification of the bare-earth data from the lidar point cloud using a series of algorithms customized for the types of terrain encountered in the project. 20090915-20090918 Manual classification of any data which appears to be bare-earth but was not properly classified using the automated methods. 20090920-20091216 Create point clouds in LAS 1.2 format for all returns with GPS week timstamps. 20091220 Convert point clouds with GPS week timestamps, to point clouds with absolute GPS timestamps, in LAS 1.2 format. 20091114-20091220 Data verified using survey control points, located throughout the area. 20091116 0 coordinate pair 0.001 0.001 Meters UTM North American Datum 1983 Projected Coordinate System 6 North 0.999600 -147.000000 0.000000 500000.00 0.000000 North American Datum of 1983 Geodetic Reference System 80 298.257222 6378137.0000 GEOID06 (Alaska) 0.001 Meters Explicit elevation coordinate included with horizontal coordinates Fort_Yukon LAS 1.2 Format Software Generated Aero-Metric, Inc. Jacques Cloutier Senior Geodetic Surveyor mailing and physical address

2014 Merrill Field Drive

Anchorage Alaska 99501-4116 USA 907-272-4495 907-274-3265 aerometric-ak@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. 20091221 Aero-Metric, Inc. Jacques Cloutier Senior Geodetic Surveyor mailing and physical address

2014 Merrill Field Drive

Anchorage Alaska 99501-4116 USA 907-272-4495 907-274-3265 aerometric-ak@aerometric-ak.com 8:00 am to 5:00 pm Alaska Time FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time