Aero-Metric, Inc. 20060404 remote-sensing image DuPage County, IL LiDAR The DuPage County Light Detection and Ranging (LIDAR) project is to provide high accuracy bare-earth processed LiDAR and a geodatabase containing bare earth points, breaklines, 2ft contours, a feature terrain dataset, and ties to adjacient counties for approximately 334 square miles. The project utilized data acquired in 2006 to post-process and classify the LiDAR data in 2008. The classified bare-earth data achieves the following: nominal horizontal spacing of 3.6 feet based on the Illinois State Plane Coordinate System, East Zone, related to the North American Datum of 1983 (NSRS2007). Vertical accuracy was to achieve a Fundamental Vertical Accuarcy at a 95% confidence level of less than 1.19 feet using the both FEMA and ASPRS category classification. Accuracy statement is based on the area of moderate to flat terrain. Diminished accuracies are to be expected in areas in dense vegetation. The accuracy of the LiDAR data as tested met the vertical accuracy to support the contour interval of 2 feet or less standards, however, derived products may be less accurate in areas of dense vegetation due to a lesser number of points defining the bare-earth in these areas. 20060404 ground condition Complete unknown -88.2597339225 -87.9182261179 41.9967349365 41.7271988659 None Light Detection and Ranging LIDAR Bare Earth Point Cloud Geodatabase None US Illinois County DuPage None None. Aero-Metric, Inc. The Fundamental Vertical Accuracy (FVA) of the TIN achieved a 0.40 feet at a 95% confidence level in the "Hard Surface" land cover category. 20 control points were used in this evaluation. None Complete All these data products were acquired at 1150 meters above mean terrain (AMT) and have a horizontal accuracy of 1.9 feet, with a nominal point spacing of 3.6 feet. The Fundamental Vertical Accuracy (FVA) of the TIN achieved a 0.4 at a 95% confidence level in the "Hard Surface" land cover category. 20 control points were used in this evaluation. The Consolidated Vertical Accuracy (CVA) of the TIN achieved a 0.33 feet at a 95% confidence level according to ASPRS Guidelines, Vertical Accuracy Reporting for LiDAR for all land cover categories. 132 points covering 5 land cover categories were tested. Land Cover categories are the following: Hard Surface, Tall Grass, Brush, Woods, and Short Grass. Supplemental Vertical Accuracy (SVA) of the TIN are shown below at a 95% confidence level, derived by the ASPRS Guidelines, Vertical Accuracy Report for LiDAR Data based on the 95th percentile error in all of the individual land cover categories. Below is the land cover categories with the achieved accuracy reported at a 95th percentile error and the number of test points. Hard Surface 0.31ft 20 Tall Grass 0.29ft 21 Brush 0.33ft 22 Woods 0.29ft 20 Short Grass 0.22ft 21 In addition to the above tests, Aero-Metric performed additonal profiles during the week of November 23, 2009 to verify contouring error that occurred in the northwest corner of the County. A total of 277 points were collected and the 0.151 feet RMSE accuracy was achieved. The minimum difference was -0.399 feet and the maximum was 0.363 feet. The LiDAR data was captured using AERO-METRIC's twin-engine Piper Navajo equipped with a LiDAR system. The LiDAR system includes a differential GPS unit and inertial measurement system to provide superior accuracy. 2006 Acquisition parameters: 1. Scanner - Optech ALTM 3100EA 2. Flight Height - 1150m above mean terrain 3. Swath Width - 19degrees 4. Sidelap - 50% 5. Nominal Post Spacing - 3.6 feet. 2006 GPS and IMU processing parameters: 1. Processing Programs and version - Applanix - POSGPS and POSProc, versions 4.3 2. Maximum baseline length - Not greater than 30km. 3. Number of base stations during LiDAR collection - A minimum of 2 with a maximum of 5 stations were occupied during any of the lifts to acquire the LiDAR data. The following were the occupied base stations: DP1A, DP2A, DP3A, DP4A, VODG, ZAU1, and an Aero-Metric set station "1" ) 4. Max separation between base stations during LiDAR collection - 0.05m 5. IMU processing monitored for consistency and smoothness - Yes. 2006 Point Cloud Processing: 1. Program and version - REALM Survey Suite, version 3.5.3 2. Horizontal Datum - NAD83(NSRS2007) 3. Horizontal Coordinates - Illinois State Plane Coordinates, East Zone, in US Survey Feet 4. Vertical Datum - NAVD88 5. Geoid Model used to reduce satellite derived elevations to orthometric heights - NGS Geoid03. 2008 LIDAR Processing: 1. Processing Programs and versions - TerraSolid TerraScan, TerraModeler and TerraMatch, Intergraph MicroStation, and GeoCue. 2. Point Cloud data is imported to TerraScan in a Microstation V8 (V) CAD environment on a specified 5000 feet by 5000 feet tiling scheme. 3. Analyze the data for overall compleness and consistency. This is to ensure that there are no voids in the data collection. 4. Inspect for calibration errors in the dataset using the TerraMatch software. This is accomplished by sampling the data collected accross all flight lines and classify the idividual lines to ground. The sofware will use the ground-classified lines to compute corrections (Heading, Pitch, Roll, and Scale). 5. Orientation corrections (i.e. Calibration corrections) are then applied to the entire dataset. 6. Automatic ground classification is performed using algorithms with customized parameters to best fit the project area. Several areas of varying relief and planimetric features were inspected to verify the final ground surface. 7. AERO-METRIC, INC. provided Quality Assurance and Quality Control (QAQC) data for this project. AERO-METRIC captured 132 QA/QC points in multipled land cover categories that were used to test the accuracy of the LiDAR ground surface. TerraScan's Output Control Report (OCR) was used to compare the QAQC data to the LIDAR 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. Based on the QAQC data, a bias adjustment was determined, and the results were applied to the LIDAR data. A final OCR was performed with a resulting RMSE of 0.175 feet. 8. Once the automatic processing and the testing of LiDAR is complete, AERO-METRIC meticulously reviews the generated bare-earth surface data to insure that proper classification was achieved as part of a Quality Control process. 9. Final deliverable are generated. Breakline Processing: 1. GeoCue was employed to create stereomates from the LiDAR intensity information to compile breakline data as required. 2. Soft copy compilers collected breaklines for all areas except Naperville. 3. Breaklines included were the following: Road edge, Road centerline, water edge, stream, river edge, river centerline, ditches, and breaklines (sharp features other than the described features above). Contour Processing: 1. Two foot contours were generated in Microstation from the LIDAR and breakline data. 2. Topology checks were run on the dataset to identify dangles, gaps, and self-intersecting contours. Contours were edited to fix any topology errors. 3. Contours were tied to Kane, Cook, and Will counties where possible. Polygons were placed in areas where contours did not tie between counties due to different dates of photography. 4. Contours were converted to shapefile format using ESRI ArcInfo software. The shapefiles were imported into the final geodatebase. City of Naperville Note The City of Naperville was previously collected by another vendor. During the tying phase of this project, it was detected that a systematic difference was evident by the vendor which prevented a successful tie. It was later decided that the County would utilze the LiDAR data that Aero-Metric collected in 2006 over the City. Breaklines were utilzed as collected by the vendor to reduce any duplication of data and only the LiDAR as collected from Aero-Metric 2006 flight was edited to ensure that the accuracy was met. Contour generation and Geodatabase inclussion was completed the same as the rest of the County. Geodatabase Creation: 1. Planimetric and topographic data from LIDAR, breakline, and contour processing was imported into an ESRI ArcGIS version 9.3 file geodatabase. Bare earth LIDAR points were imported as a single multipoint feature class, to be incorprated into a terrain dataset, as will as individual point feature classses representing the 421 tile blocks. Breaklines were divided into eight feature classes representing different types of breaklines. Contours and spot elevation were each imported into a single feature class covering the entire project area. A terrain dataset was then built using the bare earth and breakline data. In addition to data derived directly from the Dupage County LIDAR project, tie data from the surrounding three counties (Cook, Kane, and Will) is included in the geodatabase, in separate feature datasets for each county, and a layer is included representing areas that do not successfully tie across county boundaries. The following feature datasets and underlying feature classes populate the geodatabase: Dupage_County_IL.gdb (File Geodatabase) Dupage_County_Features (Feature Dataset) Bare_Earth_Points Breaklines Buildings Contours Ditches Dupage_Boundary Dupage_Terrain Dupage_Terrain_Boundary No_Tie_Areas River_Centerlines Rivers Road_Centerlines Spot_Elevations Streams Tile_Boundaries Water Dupage_County_LAS_Points (Feature Dataset) POINTS_001 ... POINTS_421 Tie_Data_Cook_County (Feature Dataset) Cook_County_Contours Cook_County_Spot_Elevations Tie_Data_Kane_County (Feature Dataset) Kane_County_Bare_Earth_Points Kane_County_Contours Tie_Data_Will_County (Feature Dataset) Will_County_Bare_Earth_Points Will_County_Contours Will_County_Spot_Elevations Final Deliverables: 1. One paper copy of the LiDAR Accuracy Assessment Report. 2. One firewire hard drive containing the following data: a. Digital copy of the LiDAR Accuracy Assessment Report b. Tiled Bare Earth LAS data c. One ESRI File Geodatabase (version 9.3) d. FGDC Compliant metadata 20091218 Unknown Point State Plane Coordinate System 1201 0.99999166666 -88.333333333333 36.6666666666666666 300000 0 coordinate pair 0.01 0.01 survey feet North American Datum of 1983 (NSRS 2007) Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 0.01 survey feet Explicit elevation coordinate included with horizontal coordinates 20091218 Aero-Metric, Inc. Mailing and physical address

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Sheboygan WI 53083 US 1-920-457-3631 1-920-457-0410 Monday through Friday 8:00 AM to 5:00 PM (Central Time) FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 {A3619B99-F802-4506-B0FA-3BC8628EF604}2009121909072500TRUE200912190908590020091219