Illinois State Geological Survey (ISGS), a division of the Prairie Research Institute of the University of Illinois Unpublished Material raster digital data http://www.isgs.illinois.edu Recommended Publishing Citation: Illinois Height Modernization Program, Illinois State Geological Survey, and Illinois Department of Transportation, 2002–2014, Illinois LiDAR county database: Illinois State Geological Survey http://crystal.isgs.uiuc.edu/nsdihome/webdocs/ilhmp/ (accessed September 18, 2014) This Digital Surface Model (DSM) data was produced all or in part from LiDAR information as of 2011. The LiDAR derived DSM covers a portion of Cass County, Illinois and include inland streams, rivers, lakes ponds and tidal features. These data are appropriate for use in local and regional analysis. Digital Elevation Models (including terrain and surface models) are raster data sets created from whole LiDAR point cloud data sets (LAS files). The LAS files are the standard LiDAR file format which contains the raw point cloud data, these data are normally classified and distinguished between points on the ground, water or elevated features such as buildings, trees, towers, bridges, etc.. These LAS files are processed into elevation models to create gridded rasters. The first returns can be used to map the top reflective surface (Digital Surface Models - DSM), these normally include open terrain areas, as well as the tops of buildings, trees, towers, and other features elevated above the bare earth. The last returns are used to map the bare-earth terrain (Digital Terrain Models - DTM), these are normally produced with irregularly-spaced points rather than the uniform grid structure of a Digital Elevation Model (DEM), Digital Terrain Models will often include breaklines to help define edges of water bodies. These acquisitions of the LiDAR data and its derivatives were made possible by a grant from the National Geodetic Survey for the National Height Modernization Program. The program is in place to enable states access to accurate, reliable heights using global positioning satellite (GPS) technology in conjunction with traditional leveling, gravity, and modern remote sensing technologies. LiDAR data and its derivatives assist in real-world uses around the state of Illinois such as; highway engineering, flood prediction, agricultural land management, mining subsidence, monitoring archaeological features, locating sinkholes and applied geologic science. The data do not replace the need for detailed site-specific studies. The information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. The information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor. none 20110101 unknown ground condition Complete Unknown -90.578 -90.152 40.13 39.894 None Light Detection and Ranging LiDAR Bare Earth Point Cloud Digital Elevation Model DEM Elevation Surface Model Digital Surface Model DSM Hillshade None US Illinois Department of Transportation Illinois Cass County None 2011 ISGS information must be obtained directly from the ISGS or from an authorized distributor. Be aware that ISGS information obtained from an unauthorized third party may have been altered subsequent to original distribution, or may no longer be current. Any access to these data, Web sites, computer systems, electronic services, and electronic networks is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section. ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved. University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section. Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, isgs@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage. Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section. Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data. Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor. The data do not replace the need for detailed site-specific studies. Wilson Co., Sanborn, Illinois State Geological Survey, Illinois Department of Transportation Illinois State Geological Survey (ISGS), a division of the Prairie Research Institute of the University of Illinois mailing and physical address

615 E. Peabody

Champaign IL 61820 USA 217-333-4747 info@isgs.illinois.edu Monday thru Friday, 8am - 5pm 217-785-0211 http://www.cam.illinois.edu/viii/VIII-1.1.htm http://www.isgs.illinois.edu http://www.vpaa.uillinois.edu/policies/web_privacy.cfm http://www.uillinois.edu/trustees/rules.cfm#sec34 The LiDAR data is checked for quality and completeness during, and immediately following each mission. Coverage and accuracy is verified in the office as the data is sent. The collected elevation data meets the SOW requirements. The flight altitude and speed was optimized to acquire the specified point resolution and accuracy. The highest resolution, and absolute referenced elevation data was produced. Density of ground mass points is appropriate for meeting the stated accuracies. Nominal Pulse Spacing of the LiDAR System was planned to 1.4 meters; multiple discrete returns-3 per pulse. LiDAR data was acquired from Dec. 2009 and Feb, March, April and Dec. of 2011. Refer also to the Disclaimer of Warranties and Accuracy of Data section of the Legal Notices of Terms and Conditions section of the University of Illinois Web Privacy Policy. A link is provided in the Cross References section. All data have had QAQC visual and statistical testing using observations performed to compare the derivative products (breaklines, classified LAS, DEM and DSM/DTM) as well as aerial photography to check for the logical consistency of the data. Complete Horizontal Accuracy for the acquired LiDAR is based upon calibration field results. Data processed to modified FEMA specifications to meet or exceed 1m. .7m Horizontal Accuracy for the acquired LiDAR is based upon calibration field results. Data processed to modified FEMA specifications to meet or exceed 1m. Horizontal accuracy tested at fliigh altitude of 1850m AMT to 0.7m 0.119 LiDAR data processed to a modified FEMA specification. Fundamental vertical accuracies to meet or exceed 18.5cm, and supplemental vertical accuracies to meet or exceed 37cm. Analysis of the checkpoints across mulitple land cover classes returned a consolidated RMSE of 0.119m LiDAR data processed to a modified FEMA specification. Fundamental vertical accuracies to meet or exceed 18.5cm, and supplemental vertical accuracies to meet or exceed 37cm. Over 400 survey checkpoints were collected across the project site for analysis and validation. The detailed results are listed in the accompanying vertical accuracy report. LiDAR Processing: The LiDAR data is checked for quality and completeness during, and immediately following each mission. Upon verification, the laser range data is processed and output in Optech's DashMap using the SBET generated from processing the ABGPS/IMU data with ground ABGPS base stations in Applanix's POS MMS. On-site calibration flights are performed to validate the initial calibration values generated during calibration flights over Wilson & Company's LiDAR Calibration Range. The calibrated missions are then combined and adjusted to project control using the TerraSolid suite of products, which are used for most LiDAR processing and editing steps. An accuracy assessment is performed to validate the LiDAR surface prior to classification. Upon surface validation, the LiDAR point cloud is classified using a series of algorithms to find bare earth and other associated features. The processed bare earth surface is manually further refined to a final surface, free from anomalies and other non-ground objects. GeoCue is used as a process management tool to track process steps through a series of checklists and assigned tasks. The final point cloud data set was provided in LAS v1.2. ISGS Secondary Processing: 1. Thorough QAQC check was completed to ensure and evaluate the quality of the data delivered and that all the specifications have been met in accordance to the contract and national specifications set for LiDAR data. 2. Through ArcGIS 10.1 the following steps were completed to created Terrain and hillshade products: a. LAS to Mulitpoint conversion using 3D analyst tools.ASPRS Classifications were used below: 1-Unclassified 2-Ground 3-Low Vegetation 4-Medium Vegetation 5-High Vegetation 6-Building 8-Model Key Points 9-Water b. Terrains are then created and pyramids are calculated. c. Terrain to Raster tool was used in 3D Analyst. The parameters of data type float, natural neighbors method, sampling distance is cell size and the point spaceing value from the LiDAR data. d. Hillshades are created from the above rasters with a Z value of 2. 3. These derivatives were checked again visually for errors. If any errors were perceived corrections were coordinated with vendor and products were updated with corrections. 4. When product was finalized then metadata was completed before making data available. 20110101 Unknown Raster State Plane Coordinate System 1202 Illinois State Plane West .999941176 -90.16666667 36.6666667 2296583.333 0 coordinate pair 0.001 0.001 survey feet North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.25722210088 NAD_1983_StatePlane_Illinois_East_FIPS_1201_Feet North American Vertical Datum of 1988 0.01 survey feet Explicit elevation coordinate included with horizontal coordinates 20140923 Illinois State Geological Survey (ISGS), a division of the Prairie Research Institute of the University of Illinois mailing and physical address

615 East Peabody Drive

Champaign IL 61820 US 217-333-4747 isgs@isgs.illinois.edu Monday through Friday 8:00 AM to 5:00 PM (Central Time) FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 The access constraints as stated for the data apply also to the metadata. Refer to the Access Constraints section of the Identification Information section. The use constraints as stated for the data apply also to the metadata. Refer to the Use Constraints section of the Identification Information section. 20130301 12273000 FGDC CSDGM Metadata TRUE file://\\ISGS-HEIGHTMOD3\C$\Lidar\SupportingFiles\FINAL_Alton_Project Local Area Network 150000000 5000 1.0 FGDC Illinois State Geological Survey (ISGS), a division of the Prairie Research Institute of the University of Illinois mailing and physical address

615 East Peabody Drive

Champaign IL 61820 USA 217-244-2414 isgs@isgs.illinois.edu Refer to the Legal Notices of Terms and Conditions of the University of Illinois Web Privacy Policy (there is a link in the Cross References section) for policy statements regarding the following: Disclaimer of Liability Disclaimer of Warranties and Accuracy of Data Disclaimer of Endorsement Disclaimer for External Links Disclaimer of Duty to Continue Provision of Data Security Choice of Law By obtaining these data you agree to the provisions of the University of Illinois Web Privacy Policy, regardless of the manner in which the information was obtained. other no compression applied http://www.isgs.uiuc.edu/nsdihome/webdocs/ilhmp/ http://www.isgs.uiuc.edu/nsdihome/webdocs/ilhmp/ Windows 7 CD-ROM none no fees The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, ESRI formats can be imported into many different GIS software packages. It is expected that customers who obtain these data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind. GRID Raster ISGS Raster Grid Values Raster Grid Values ISGS These acquisitions of the LiDAR data and its derivatives were made possible by a grant from the National Geodetic Survey for the National Height Modernization Program. The program is in place to enable states access to accurate, reliable heights using global positioning satellite (GPS) technology in conjunction with traditional leveling, gravity, and modern remote sensing technologies. LiDAR data and its derivatives assist in real-world uses around the state of Illinois such as; highway engineering, flood prediction, agricultural land management, mining subsidence, monitoring archaeological features, locating sinkholes and applied geologic science. The data do not replace the need for detailed site-specific studies. The information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. The information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor. <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This Digital Surface Model (DSM) data was produced all or in part from LiDAR information as of 2011. The LiDAR derived DSM covers a portion of Cass County, Illinois and include inland streams, rivers, lakes ponds and tidal features. These data are appropriate for use in local and regional analysis. Digital Elevation Models (including terrain and surface models) are raster data sets created from whole LiDAR point cloud data sets (LAS files). The LAS files are the standard LiDAR file format which contains the raw point cloud data, these data are normally classified and distinguished between points on the ground, water or elevated features such as buildings, trees, towers, bridges, etc.. These LAS files are processed into elevation models to create gridded rasters. The first returns can be used to map the top reflective surface (Digital Surface Models - DSM), these normally include open terrain areas, as well as the tops of buildings, trees, towers, and other features elevated above the bare earth. The last returns are used to map the bare-earth terrain (Digital Terrain Models - DTM), these are normally produced with irregularly-spaced points rather than the uniform grid structure of a Digital Elevation Model (DEM), Digital Terrain Models will often include breaklines to help define edges of water bodies.</SPAN></P></DIV></DIV></DIV> Wilson Co., Sanborn, Illinois State Geological Survey, Illinois Department of Transportation IL_Cass_DSM_2011 Recommended Publishing Citation: Illinois Height Modernization Program, Illinois State Geological Survey, and Illinois Department of Transportation, 2002–2016, Illinois Height Modernization Program (ILHMP): LiDAR data: Illinois State Geological Survey http://clearinghouse.isgs.illinois.edu/ (accessed June 8, 2016) Light Detection and Ranging LiDAR Bare Earth Point Cloud Digital Elevation Model DEM Elevation Surface Model Digital Surface Model DSM Hillshade <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved. University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section. Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, isgs@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage. Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section. Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data. Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor. The data do not replace the need for detailed site-specific studies.</SPAN></P></DIV></DIV></DIV>