Sanborn Map Company 200908 Unknown vector digital data \\cos-svr-7\userhome\alucero\My Documents\322009154.Dekalb Co. IL LiDAR\Document\Technical\Metadata\FGDC_DekalbCo_LAS LiDAR generated point cloud acquired in summer 2009 for a 640-square mile area encompassing Dekalb County, IL. LiDAR points used to determine a DEM surface. 20090402 20090409 ground condition Complete As needed -88.955065 -88.577262 42.161076 41.621392 None DEM Elevation Data LiDAR None Illinois Dekalb County United States This data may be used by the requested party for stated purposes and should not be re-distributed. This data is for planning purposes only and should not be used for legal or cadastral purposes. Sanborn Map Company Andrew Lucero Sr. Project Manager mailing and physical address

1935 Jamboree Drive

Colorado Springs CO 80920 USA (719) 264-5645 719-528-5093 alucero@sanborn.com 8:00 - 5:00 MST Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.4.1420 Data covers the tile scheme provided for the area of interest. A visual qualitative assessment was performed in the source Lidar dataset. Lidar acquired and processed to meet 1m (RMSE) horizontal accuracy. 1m Horizontal point accuracy is a function of angular origination of the pulse; IMU orientation; the scanner encoder and ranging function and will vary depending on the proposed point density selected for the collection. Statistically, the error is roughly 1/3 of the illuminated foot print on the ground and is a function of the beam divergences. The vertical accuracy is based on the Sanborn independent collection of 68 FEMA checkpoints (BE, Low Veg, and HIgh veg) survey points distributed throughout the project. The fundamental vertical accuracy at 95 percent confidence level in open terrain tested 0.16 feet or 4.88 centimeters. 0.16 feet Based on the vertical accuracy testing conducted by Sanborn using NSSDA and FEMA methodology, vertical accuracy at the 95% confidence level (called Accuracyz) is computed by the formula RMSEz x 1.9600. The fundamental vertical accuracy at 95 percent confidence level ifor all classification combined tested 0.20 feet or 6.09 centimeters. SANBORN MAP COMPANY 20090623 Unknown Flight Altitude - 1400m (agl) Repitition Rate - 62000kz Scan Frequency - 36kz Airspeed - 120 - 140 knots Field of View - 40 degrees Avg. Point Spacing 1.20m Pass Spacing - 834m online 20090402 20090409 ground condition LiDAR Data acquisition specifications The ABGPS, IMU, and raw Optech LiDAR data are integrated into the post processor software. The resultant file is in a LAS binary file format. The LAS file version 1.1 formats can be easily transferred from one file format to another. It is a binary file format that maintains information specific to the LiDAR data (return#, intensity value, xyz, etc.). The resultant points are produced in the geodetic coordinates referenced to the NAD83 horizontal datum and GRS80 vertical datum. The date and time for each flight line can be determined using the Julian date and time. The Julian date is a continuous count of days and fractions since noon Universal Time on January 1, 4713 BCE on the Julian calendar. Airborne Global Positioning System Data Inertial Measurement Unit LiDAR Scans 200904 LiDAR Point Cloud Sanborn Map Company Andrew Lucero Sr. Project Manager mailing and physical address

1935 Jamboree Drive

Colorado Springs CO 80920 USA (719) 264-5645 (719) 528-5093 alucero@sanborn.com 8:00 - 5:00 MST The unedited data are classified to facilitate the application of the appropriate feature extraction filters. A combination of proprietary filters is applied as appropriate for the production of bare earth digital terrain models (dtms). Interactive editing methods are applied to those areas where it is inappropriate or impossible to use the feature extraction filters, based upon the design criteria and/or limitations of the relevant filters. These same feature extraction filters are used to produce elevation height surfaces. The LiDAR mass points were delivered in American Society for Photogrammetry and Remote Sensing LAS 1.1 format. The header file for each dataset is complete as define by the LAS 1.1 specification. In addition the following fields are included: Flight Date Julian, Year, and Class. The LAS files do not include overlap. The data was classified as follows: Class 1 = Unclassified. This class includes vegetation, buildings, noise etc. Class 2 = Ground; Class 7 = Low Points; Class 12 = Overlap. LiDAR Point Cloud 2009 Classified LiDAR datasets Sanborn Map Company Andrew Lucero Sr. Project Manager mailing and physical address

1935 Jamboree Drive

Colorado Springs CO 80920 USA (719) 264-5645 (719) 528-5093 alucero@sanborn.com 8:00 - 5:00 MST Conversion from Geodetic coordinates NAD83 into Illinois State Plane East coordinates using NAD83 and conversion from ellipsoid heights (meters) into orthometric heights (U.S. Survey Feet). Classified LiDAR datasets 2009 Projected and tiled LiDAR datasets LAS 1.2 format Sanborn Map Company Andrew Lucero Sr. Project Manager mailing and physical address

1935 Jamboree Drive

Colorado Springs CO 80920 USA (719) 264-5645 (719) 528-5093 alucero@sanborn.com 8:00 - 5:00 MST Vector G-polygon 1 Lambert Conformal Conic 29.583333 30.750000 -84.500000 29.000000 1968500.000000 0.000000 coordinate pair 0.001500 0.001500 survey feet North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 0.000500 feet Explicit elevation coordinate included with horizontal coordinates LAS Point Record Entries Terrascan Point Classes Point Data Classification LAS Version 1.1 Classification Value ASPRS LAS V1.1 X Easting Coordinate LAS v1.1 Coordinates defining the features Y Northing Coordinate LAS v1.1 Coordinates defining the features. Z Elevation Value LAS v1.1 Coordinates defining the features. Intensity LiDAR return intensity value LAS v1.1 0-5100 LiDAR Pulse Energy LAS v1.1 Return Number LiDAR Return Number LAS v1.1 1-4 Return Number Airborne LiDAR System GPS Time GPS seconds of the week LAS v1.1 Positive numbers that are recorded to UTC time and begin at 00:00:01 Sunday morning and end at 24:00:00 Saturday midnight Sanborn Map Company Andrew Lucero Sr. Project Manager mailing and physical address

1935 Jamboree Drive

Colorado Springs CO 80920 USA (719) 264-5645 (719) 528-5093 alucero@sanborn.com 8:00 - 5:00 MST Downloadable Data The data represent the results of data collection and processing for a specific activity and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose. 20090827 Sanborn Map Company Andrew Lucero Sr. Project Manager mailing and physical address

1935 Jamboree Drive

Colorado Springs CO 80920 USA (719) 264-5645 719-528-5093 alucero@sanborn.com FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile