Aerial Services, Inc. 20210910 Lidar point cloud Product: These lidar data are processed Classified LAS 1.4 files, formatted to 18,609 individual 2000 US survey feet x 2000 US survey feet tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary. Geographic Extent: Block 1 HicksDome_FloursparDistrict Illinois, covering approximately 2616 square miles. Dataset Description: Block 1 HicksDome_FloursparDistrict, Illinois 2019 Lidar project called for the planning, acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing of 0.5 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.3. The data was developed based on a horizontal projection/datum of NAD83(2011), State Plane Illinois East, US survey feet, and a vertical datum of NAVD88 (GEOID12B), US survey feet. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to 18,609 individual 2000 US survey feet x 2000 US survey feet tiles, as was tiled Intensity Imagery, and 18,609 tiled bare earth DEMs; all tiled to the same 2000 US survey feet x 2000 US survey feet schema. DEMs were created with a 2 foot cell size and for that reason one DEM could not be produced for Tile 7430_4150 due to the tile containing less that 2 feet of data within the AOI. ISGS review: There are areas in Massac County where there are not a lot of vegetation points (most of the county), and there are other areas where the vegetation appears normal. It just depends on the flight line. The issue of vegetation points not classified correctly (over buildings) was pointed out to vendor and was not corrected. Ground Conditions: Lidar was collected in early 2020, while no snow was on the ground and rivers were at or below normal levels. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, Subcontractor, Surveying and Mapping, LLC (SAM) established a total of 39 ground control points that were used to calibrate the lidar to known ground locations established throughout the Block 1 HicksDome_FloursparDistrict, Illinois project area. An additional 98 independent accuracy checkpoints, 57 in Bare Earth and Uraban landcovers (57 NVA points), 41 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (41 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. To acquire QL2+ lidar detailing surface elevation data, and vegetation to support the National Resources Conservation Service (NRCS) high resolution elevation enterprise program, the Illinois Stat Geological Survey's Height Modernization Program, the USGS Earth mapping Resources Initiative (Earth MRI) and the 3DEP mission. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines and Raster DEMs. The purpose of this lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 2 US survey feet cell size. These lidar point cloud data were used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary. USGS Contract No. G17PC00006 CONTRACTOR: Aerial Services, Inc. Lidar data were acquired and calibrated by the prime contractor. SUBCONTRACTOR: Tetra Tech manually edited bare earth surface, preformed hydro collection, and flattening. All follow-on processing was completed by the prime contractor. U.S. Geological Survey (USGS) - National Geospatial Program (NGP) Lidar Base Specification v1.3 Leica ALS70-HP 4 0.5 4 0.5 4 1200 125 50 47 424 2 0.6 1064 1 0.26 1119 30 National Geodetic Survey (NGS) Geoid12B 0.5 0 0 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 using the standard LAS overlap bit 16 1 Processed, but Unclassified 2 Bare Earth Ground 3 Low Vegetation 4 Medium Vegetation 5 High Vegetation 7 Low Noise 9 Water 17 Bridge Decks 18 High Noise 20 Ignored Ground 20200229 20200308 ground condition Complete None Planned -89.19060244 -88.28171027 38.61712788 37.29972417 739294 999000 710220 231580 None Model LAS Point Cloud Remote Sensing Elevation Data Lidar None Illinois Hamilton Franklin Saline Williamson Johnson Wayne No restrictions apply to these data. None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data. Waypoint's Inertial Explorer version 8.60; Leica's CloudPro version 1.2.4 ; MicroSatation Connect Update 13 - version 10.13.01.01; TerraSolid TerraMatch version020.003,TerraModel version 020.004, TerraScan version 020.008; Windows 10 Operating \\server\directory path\*.las 2.51TB Data covers the entire area specified for this project. These LAS data files include all data points collected. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications. This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class. The boresight for each lift was done individually as the solution may change slightly from lift to lift. The following steps describe the Raw Data Processing and Boresight process: 1) Technicians processed the raw data to LAS format flight lines using the final GPS/IMU solution. This LAS data set was used as source data for boresight. 2) Technicians first used Aerial Services Inc. proprietary and commercial software to calculate initial boresight adjustment angles based on sample areas selected in the lift. These areas cover calibration flight lines collected in the lift, cross tie and production flight lines. These areas are well distributed in the lift coverage and cover multiple terrain types that are necessary for boresight angle calculation. The technician then analyzed the results and made any necessary additional adjustment until it is acceptable for the selected areas. 3) Once the boresight angle calculation was completed for the selected areas, the adjusted settings were applied to all of the flight lines of the lift and checked for consistency. The technicians utilized commercial and proprietary software packages to analyze how well flight line overlaps match for the entire lift and adjusted as necessary until the results met the project specifications. 4) Once all lifts were completed with individual boresight adjustment, the technicians checked and corrected the vertical misalignment of all flight lines and also the matching between data and ground truth. The relative accuracy was less than or equal to 6 cm RMSEz within individual swaths and less than or equal to 8 cm RMSEz or within swath overlap (between adjacent swaths). 5) The technicians ran a final vertical accuracy check of the boresighted flight lines against the surveyed check points after the z correction to ensure the requirement of NVA = 19.6 cm 95% Confidence Level (Required Accuracy) was met. Point classification was performed according to USGS Lidar Base Specification 1.4, and breaklines were collected for water features. Bare earth DEMs were exported from the classified point cloud using collected breaklines for hydroflattening. HicksDome_FloursparDistrict_lidar_gnd_ctrl 20201117 LAS Point Classification:  The point classification was performed as described below.  Classification Filters were applied to aid in the definition of; terrain characteristics, and vegetation attribution to low, medium, or high.  Filtering processes address aspects of the data such as ground points, noise points, air points, low points, manmade features,  and setting overlap bitset.   The automated filtration defined: Low Vegetation at 0.5-5 feet, Medium Vegetation at 5-20 feet, and High Vegetation at >20 feet by distance from the ground. Classifying low vegetation to class code 3, medium vegetation to class code 4, and high vegetation to class code 5 respectively.  These vegetation classes represent all non-noise points that fall into the distances above the ground surface, and will likely include buildings, utility poles, powerlines, and other infrastructure.  The Classified point cloud data was manually reviewed to ensure correct classification of; ground (ASPRS class 2).  After the bare earth surface was finalized, it was then used to generate all hydro-breaklines through heads-up digitization.  All ground (ASPRS class 2) lidar data inside of the Inland Ponds and Lakes, and Inland Streams and Rivers are classified to water (ASPRS class 9).  A buffer of 2.5 feet was used around each hydro-flattened feature to classify ground (ASPRS class 2) to ignored ground (ASPRS class 20).  Island features were checked to ensure that Ground point (ASPRS class 2) remained classified as Ground.  Ground points (ASPRS class 2) within 2.5 feet of bridge breaklines, used to reduce triangulation between bridge decks were also classified to Ignored ground (ASPRS class 20).  All bridge decks were classified to Bridge deck (ASPRS class 17).  All remaining points were filtered, or manually classified to their respective point classification; processed (ASPRS class 1), low vegetation (ASPRS class 3), medium vegetation (ASPRS class 4), high vegetation (ASPRS class 5), low noise (ASPRS class 7), high noise (ASPRS class 18).  TerraScan v020.008 was used to identify the overlap flag and bit set flags to LAS v1.4 specifications. LP360 64bit was used to deduce the Well Known Text (WKT) and an ASI proprietary software was used to format the LAS to the final LAS v1.4 Format 6 version. LAStools by rapidlasso GmbH, open source, lasvalidate (open source LGPL) and an ASI proprietary software was used to perform final analysis to checks on LAS header information, LAS point classes, and LAS timestamps. 20210907 Data was tested at 0.5 meter nominal pulse spacing and a 4 pulses per meter. The nominal pulse spacing was tested on classified tiled LAS using geometrically reliable first-return points. NPS was tested using Delaunay Triangulation that produced average point spacing between all nearest neighbors. 20210401 Point Point 87,976,140,013 State Plane Coordinate System 1983 NAD 1983 2011 Illinois East State Plane (FIPS 1201) 0.999975 -88.33333333 36.66666667 984250 0.0 coordinate pair 0.01 0.01 US survey feet North American Datum of 1983 2011 Geodetic Reference System 1980 6378137 298.257222101 North American Vertical Datum of 1988, Geoid 12B 0.01 US survey feet Explicit elevation coordinate included with horizontal coordinates 20210910 Aerial Services, Inc. mailing and physical

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Cedar Falls IA 50613 USA (319)277-0436 FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 None. None. None. Unclassified. None. None. None. IL_Massac_DSM_2020