Merrick & Co 2018 las data Classified las 1.4 Classified las 1.4 Greenwood Village, CO Merrick & Co LIDAR-derived binary (.las) files ASPRS ver 1.4 format containing classified points of all returns. We have 11 classifications Unclassified, Ground, Low Veg, Medium Veg, High Veg, Buildings, Low Noise, Water, Ignore Ground, Bridge Decks and High Noise. Model key points are bit-flagged and created from ground (class = 2) points using a two foot horizontal and a 0.2 foot vertical variance. The files are delivered in section formatted tiles. These files adhere to the National Enhanced Elevation Assessment (NEEA) Quality Level 2 (QL2) standards. The contractual aggregate nominal pulse spacing (ANPS) is less than or equal to 0.5m. The contractual aggregate nominal point density (ANPD) is 4.0 points or greater per square meter. U18049 - Acquisition and processing of high fidelity Light Detection and Ranging (LiDAR) data for Boone County commencing in the Spring of 2018. Boone County is approximately 303 square miles. Services include LiDAR acquisition; ground control survey; LiDAR post-processing; LiDAR classification; hydro-flattening; QA/QC, and; development of derivative deliverable products (including metadata and reporting). USGS NGP Base Specification v1.2 Optech Galaxy Airborne Laser Terrain Mappers (ALTM) SN5060385 8 0.5 4 0.5 4 1650 170 30 88 400 3.5 1.05 1064 1 0.25 2901 20 NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US National Geodetic Survey (NGS) Geoid12B 0.17 0.047 25 0.049 15 0.059 15 1.4 6 Withheld (ignore) points were identified in these files using the standard LAS Withheld bit. Swath "overage" points were identified in these files by a separate bit flag. 12-bit 1 Undetermined/Unclassifed 2 Ground 3 Low Veg 4 Medium Veg 5 High Veg 6 Building 7 Low point (noise) 9 Water 10 Ignore ground (near a breakline) 17 Bridge Decks 18 High Noise 20180423 unknown 20180428 unknown ground condition Complete Unknown -88.946097 -88.699328 42.499958 42.147692 none LIDAR DEM Intensity none Illinois Boone County none 2018 none unknown Sheena Beaverson Illinois State Geological Survey Program Manager mailing and physical address

615 E. Peabody Drive

Champaign IL 61820 217-244-9306 sbeavers@illinois.edu Please refer to the distribution information section. Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095 The dataset was captured, attributed, and reviewed to ensure completeness and accuracy of at least 95%. The dataset was captured, attributed, and reviewed to ensure completeness and accuracy of at least 95%. The dataset was captured, attributed, and reviewed to ensure completeness and accuracy of at least 95%. This data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 17(cm) RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 40cm at a 95% confidence level. This data set was tested to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class. Actual NVA accuracy was found to be RMSEz = 2.411cm, equating to +/- 4.725cm at the 95% confidence level. Actual VVA accuracy was found to be +/-5.882cm at the 95th percentile. 0.049 Classified Non-Vegetated Vertical Accuracy (NVA) tested 0.049 meters vertical accuracy at the 95 percent confidence level. Twenty-five (25) NVA points were used and validated against the DEM. 0.059 Classified Vegetated Vertical Accuracy (VVA) tested 0.059 meters vertical accuracy at the 95th percentile. Fifteen (15) VVA points were used and validated against the DEM. JUNEAU Associates, Inc., P.C. 2018 Unknown tabular digital data ground control ground control Granite City, IL JUNEAU Associates, Inc., P.C. disc 2018 publication date ground control control point network to establish horizontal and vertical accuracy Merrick & Co 2018 LAS data LiDAR LiDAR Greenwood Village, Co. Merrick & Co disc 20180423 unknown 20180428 unknown ground condition LiDAR Surface returns used to create surface models. Classifed lidar: LIDAR data was collected using the Optech Galaxy sensor. The raw data was verified in MARS software for complete coverage of the project area, and boresighted to align the flightlines. Raw data files were parsed into manageable client-specific tiles. These tiles were then processed through automated filtering that separates the data into different classification groups: unclassified points, ground points, low veg, medium veg, high veg, buildings, low noise, water, ignored ground, bridge decks and high noise. The data was next taken into MARS to reclassify the erroneous points that may remain in the LIDAR point cloud after auto filter. Four points or greater per square meter (QL2) ASPRS ver 1.4 format. ground control LiDAR 20180817 Doug Jacoby Merrick & Co Project Manager mailing and physical address

5970 Greenwood Plaza Blvd

Greenwood Village Co 80111 USA 303-353-3903 doug.jacoby@merrick.com Breaklines: Using MARS software hydro-flattened breaklines (rivers greater than 100 feet wide and waterbodies greater than two square acres and islands greater than one acre) were compiled. Additionally breaklines were placed underneath bridges and on waterfalls where necessary. MARS software using Intensity values and 3d elevations generates ESRI shape files which are then imported into an ESRI gdb for a project wide delivery. Monotonicity checks where validated (water flowing downstream). ground control LiDAR 20180817 Doug Jacoby Merrick & Co Project Manager mailing and physical address

5970 Greenwood Plaza Blvd

Greenwood Village Co 80111 USA 303-353-3903 doug.jacoby@merrick.com DEM: Using MARS software a two-foot (2ft) DEM Erdas Imagine .img file was created using the ground classified lidar points along with the breaklines. The files are delivered in 2000ft by 2000ft tiles. ground control LiDAR 20180817 Doug Jacoby Merrick & Co Project Manager mailing and physical address

5970 Greenwood Plaza Blvd

Greenwood Village Co 80111 USA 303-353-3903 doug.jacoby@merrick.com Intensity: Using MARS software a two-foot (2ft) Intensity Erdas Imagine .img file was created using the Intensity values of all returns minus the overlap points. The files are delivered in 2000ft by 2000ft tiles. These files are 8bit unsigned integers. ground control LiDAR 20180817 Doug Jacoby Merrick & Co Project Manager mailing and physical address

5970 Greenwood Plaza Blvd

Greenwood Village Co 80111 USA 303-353-3903 doug.jacoby@merrick.com Vector NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US 0.999975 -88.333333 36.666667 984250.000000 0.000000 coordinate pair .001 .001 survey feet D_NAD_1983_2011 Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 GEOID12B 0.000100 feet Explicit elevation coordinate included with horizontal coordinates Classified las 1.4 Classified las 1.4 Merrick & Co ASPRS ver 1.4 format: 1 = Unclassified 2 = Ground 3 = Low Veg 4 = Medium Veg 5 = High Veg 6 = Building 7 = Low Noise 9 = Water 10 = Ignore Ground 17 = Bridge 18 = High Noise Model key points are bit-flagged and created from ground (class = 2) points using a 2 foot horizontal and a 0.2 foot vertical variance. ASPRS ver 1.4 format: 1 = Unclassified 2 = Ground 3 = Low Veg 4 = Medium Veg 5 = High Veg 6 = Building 7 = Low Noise 9 = Water 10 = Ignore Ground 17 = Bridge 18 = High Noise Model key points are bit-flagged and created from ground (class = 2) points using a 2 foot horizontal and a 0.2 foot vertical variance. 20180817 Doug Jacoby Merrick & Co. Project Manager mailing and physical address

5970 Greenwood Plaza Blvd.

Greenwood Village Co 80111 303-353-3903 doug.jacoby@merrick.com Please refer to the distribution information section. FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time None. None.