Illinois Height Modernization: LiDAR Data

Lidar Inventory Map

The Illinois Height Modernization Program (ILHMP) is part of a larger National Program where efforts are in place to modernize and update geospatial height information thru establishing accurate, reliable heights using Global Navigation Satellite Systems (GNSS) technology in conjunction with traditional leveling, gravity, and modern remote sensing information such as LiDAR data.

One of ILHMPs goals is to establish data sharing agreements to archive and distribute elevation data for select Illinois counties. Data have been acquired using Light Detection And Ranging (LiDAR) technology, in compliance with different contract specifications. Data are offered as originally deliver LAS tile, DAT, DGN or TIN if available or as the derivative product of DEM/DTM or DSM. More information about the ILHMP program.

Some helpful links:

LiDAR Glossary from the Applied Geomatics Research Group

LAS file format Spec Version is ---- Version 1.2, November 2014


Data Definitions - definitions


Download Data

Note: ZIP files are large in size; some may take several hours to download. Make certain your Internet provider does not have a 2GB cap or time limit on file downloads. Submit a Help Request Form to receive any county by mail.



expected = LiDAR has been acquired but not yet delivered; derivative data products will be produced.

by request = derivative data available upon request. Please submit Help Request Form.

not acquired = LiDAR not acquired or planned

contact county = distribution is available only through county; contact information available from ISGS.


County Year Derivatives LAS Metadata Breaklines Tile index DAT DGN TIN
Adams 2009 ZIP 23.8GB ZIP 30.9GB Text ZIP ZIP 8.94 GB ZIP 27.4 GB ZIP 26.7 GB
Alexander 2009-2011 ZIP 2.59 GB ZIP 11.5 GB XML ZIP
Bond expecting
Boone 2007 ZIP  4.2GB ZIP 22.8GB XML ZIP
Brown not acquired
Bureau not acquired
Calhoun 2009-2011 ZIP 2.92 GB ZIP 9.42 GB XML   ZIP
Carroll 2009 ZIP 7.6GB ZIP 28.3GB XML ZIP ZIP ZIP 6.19GB ZIP 21.1GB ZIP 30.4GB
Cass not acquired
Champaign 2008 ZIP  7.1GB ZIP 26.6GB XML ZIP ZIP      
Christian expecting
Clark 2011 ZIP  10.9GB ZIP 17.5GB XML ZIP ZIP ZIP 8.61GB ZIP 29.1GB ZIP 42.6GB
Clay 2011 ZIP  15.5GB ZIP 17GB XML ZIP ZIP ZIP 8.22GB ZIP 27.9GB ZIP 41.0GB
Clinton expecting
Coles 2011 ZIP  8.6GB ZIP 15.9GB XML ZIP ZIP ZIP 6.97GB ZIP 22.6GB ZIP 34.9GB
Cook 2008 contact county
Crawford 2011 ZIP  10.1GB ZIP 17GB XML ZIP ZIP ZIP 7.72GB ZIP 26.4GB ZIP 38.2GB
Cumberland 2011 ZIP  7.6GB ZIP 16.7GB XML ZIP ZIP ZIP 6.01GB ZIP 20.1GB ZIP 29.9GB
DeKalb 2009 contact county
DeWitt 2012 ZIP  16.0GB ZIP 27.6GB XML ZIP ZIP ZIP 10.1GB ZIP 35.7GB ZIP 54.4GB;
Douglas 2012 ZIP  15.2GB ZIP 26.7GB XML ZIP ZIP ZIP 11.4GB ZIP 40.7GB ZIP 61.1GB
DuPage 2006 ZIP 3.0GB ZIP 14.6GB XML   ZIP
Edgar 2012 ZIP  23.9GB ZIP 46GB XML ZIP ZIP ZIP 17.8GB ZIP 62.4GB ZIP 90.2GB
Edwards 2011 ZIP  5.4GB ZIP 13.8GB XML ZIP ZIP ZIP 4.32GB ZIP 14.5GB ZIP 21.3GB
Effingham 2011 ZIP  10.3GB ZIP 17.4GB XML ZIP ZIP ZIP 8.52GB ZIP 28.8GB ZIP 42.3GB
Fayette 2011 ZIP  16.8GB ZIP 25.9GB XML ZIP ZIP ZIP12.4 GB ZIP 39.9GB ZIP 62 GB
Ford acquisition planned
Franklin 2014 ZIP 13.9GB ZIP 24.5GB XML ZIP ZIP ZIP 6.78GB ZIP 23.5GB ZIP 29.6GB
Fulton 2012 ZIP  20.7GB ZIP 35.5GB XML ZIP ZIP ZIP 15.2GB; ZIP 53.6GB ZIP 74.1GB
Gallatin 2012 ZIP  4.4GB ZIP 11.9GB XML ZIP ZIP
Greene not acquired
Grundy 2008 ZIP  2.4GB ZIP 16.3GB XML ZIP ZIP
Hamilton 2012 ZIP  5.9GB ZIP 16.7GB XML ZIP ZIP
Hancock not acquired
Hardin 2014 ZIP8.52 GB ZIP 36.6 GB XML ZIP ZIP ZIP 4.15 GB ZIP 21.5 GB
Henderson 2012 ZIP  8.5GB ZIP 17.1GB XML ZIP ZIP ZIP 7.53GB ZIP 27.4GB ZIP 36.6GB
Henry 2009 ZIP  5.6GB ZIP 26.7GB XML ZIP ZIP ZIP 11.2GB ZIP 39.7GB ZIP 55.3GB
Iroquois acquisition planned
Jackson 2014 ZIP 16.6GB ZIP 47.6GB XML ZIP ZIP ZIP9.25 GB ZIP 38.6GB ZIP 37.0GB
Jasper 2011 ZIP  10.6GB ZIP 16.7GB XML ZIP ZIP ZIP 8.4GB ZIP 28.4GB ZIP 41.8GB
Jefferson 2012 ZIP 6.2GB ZIP 11.9GB XML ZIP
Jersey 2009-2011 ZIP 3.86 GB ZIP 12.9 GB XML ZIP
JoDaviess 2009 ZIP  4.1GB ZIP 40.1GB XML ZIP ZIP ZIP 5.34GB ZIP 25.5GB ZIP 28.5GB
Johnson 2012 ZIP  11.8GB ZIP 15.8GB
Kane 2008 ZIP  8.0GB ZIP 13.6GB XML ZIP
Kankakee 2014 ZIP 44.7 GB ZIP 116 GB XML ZIP ZIP ZIP 1.14 GB ZIP 125 GB
Kendall 2010 ZIP  6.1GB ZIP 10GB XML   ZIP
Knox 2012 ZIP  24.4GB ZIP 26.4GB XML ZIP ZIP ZIP 13.3GB ZIP 46.2GB ZIP 65.1GB
Lake 2007 ZIP  13.1GB ZIP 18.3GB XML   ZIP
LaSalle not acquired
Lawrence 2011 ZIP  8.5GB ZIP 12.9GB XML ZIP ZIP ZIP 5.73GB ZIP 19.6GB ZIP 28.8GB
Lee 2009 ZIP  13.8GB ZIP 31GB XML ZIP ZIP ZIP 9.77 GB ZIP31.5 GB ZIP 50.3 GB
Livingston acquisition planned
Logan 2012 ZIP 70.2 GB North Half 65.3 GB
South Half 48.9 GB
Macon 2011 ZIP  9.0GB ZIP 16.9GB XML ZIP ZIP ZIP 7.48GB ZIP 26.0GB ZIP 37.3GB
Macoupin not acquired
Madison 2014 expected ZIP
Marion 2014 expected
Marshall 2012 ZIP  9.8GB ZIP 13.4GB XML ZIP ZIP ZIP 7.22GB ZIP 23.8GB ZIP 35.6GB
Mason not acquired
Massac 2012 ZIP  7.5GB
McDonough 2012 ZIP  11.8GB ZIP 21.7GB XML ZIP ZIP
McHenry 2008 ZIP  9.24GB ZIP 16.9GB XML ZIP ZIP
McLean 2012 ZIP  4.47GB ZIP 78.4GB XML ZIP ZIP ZIP 30.8GB ZIP 108 GB ZIP 163 GB
Menard not acquired
Mercer 2012 ZIP  17.1GB ZIP 22.3GB XML ZIP ZIP ZIP 10.8 GB ZIP 38.9GB ZIP 52.4 GB
Monroe 2012 ZIP 12.0GB ZIP 20.2GB XML ZIP
Montgomery not acquired
Morgan not acquired
Moultrie 2011 ZIP  5.7GB ZIP 10.5GB XML ZIP ZIP ZIP 4.75GB ZIP 16.1 GB ZIP 23.9 GB
Ogle 2009 ZIP  21.4GB ZIP 34GB XML ZIP ZIP ZIP 10.7 GB ZIP 35.4 GB ZIP 54.3 GB
Peoria 2008 ZIP  7.5GB
Peoria 2012 ZIP 13.6GB ZIP 24.5GB XML ZIP ZIP ZIP 11.0 GB ZIP 37.2 GB ZIP 52.6 GB
Perry 2014 ZIP 12.5 GB ZIP 33.1 GB XML ZIP ZIP ZIP 7.94 GB ZIP 31.2 GB ZIP 29.0 GB
Piatt 2011 ZIP  32.0GB
Piatt 2012 ZIP  17.0GB ZIP 29.9GB XML ZIP ZIP ZIP 13.1 GB ZIP 46.6 GB ZIP 70.1 GB
Pike not acquired
Pope 2014 ZIP17.2 GB ZIP 4.37 GB XML ZIP 8.1GB ZIP 8.1GB ZIP 8.29 GB ZIP 43.9 GB
Pulaski 2012 ZIP  6.3GB ZIP 8.1GB XML ZIP
Putnam 2012 ZIP  4.0GB ZIP 5.6GB XML ZIP ZIP ZIP 2.88 GB ZIP 9.55 GB ZIP 14.1 GB
Randolph 2012 ZIP 16.7GB ZIP 32.2GB XML ZIP
Richland 2011 ZIP  12.4GB ZIP 13.6GB XML ZIP ZIP ZIP 7.42 GB ZIP 25.0 GB ZIP 36.9 GB
Rock Island 2009 ZIP  3.1GB ZIP 21.8GB XML ZIP ZIP ZIP 5.23GB ZIP 17.5GB ZIP 25.6GB
St. Clair 2012 ZIP  20.4GB ZIP 30.4GB XML ZIP
Saline 2011 ZIP  5.4GB ZIP 15.8GB XML ZIP
Sangamon not acquired
Schuyler not acquired
Scott not acquired
Shelby 2011 ZIP 15.9GB ZIP 23.7GB XML ZIP ZIP ZIP 12.5GB ZIP 42.1GB ZIP 62.7GB
Stark 2012 ZIP 8.1GB ZIP 9.5GB XML ZIP ZIP ZIP 5.50 GB ZIP 18.8 GB ZIP 26.4 GB
Stephenson 2009 ZIP 3.6GB ZIP 24.2GB XML ZIP ZIP ZIP 5.55 GB ZIP 25.3 GB ZIP 28.2 GB
Tazewell 2012 ZIP 13.8GB ZIP 23.4GB XML ZIP ZIP ZIP 7.34 GB ZIP 35.8 GB ZIP 56.3 GB
Union 2011 ZIP 4.52 GB ZIP 20.5 GB XML ZIP
Vermilion 2012 ZIP 34.1GB ZIP 68.6GB XML ZIP ZIP ZIP 26.1 GB ZIP 93.3 GB ZIP 135.0 GB
Wabash 2011 ZIP  5.7GB ZIP 8.6GB XML ZIP ZIP ZIP 4.45 GB ZIP 15.1 GB ZIP 22.1 GB
Warren 2011-2012 ZIP  15.1GB ZIP 19.1GB XML ZIP ZIP ZIP 10.4 GB ZIP 38.1 GB ZIP 51.0 GB
Washington expecting
Wayne 2011 ZIP 16.3GB ZIP 25.1GB XML ZIP ZIP ZIP 12.3 GB ZIP 41.4 GB ZIP 61.5 GB
White 2012 ZIP  10GB ZIP 18.1GB XML ZIP ZIP
Whiteside 2009 ZIP 5.5GB ZIP 32.1GB XML ZIP ZIP ZIP 9.26 GB ZIP 31.6 GB ZIP 46.7 GB
Will 2004 ZIP  6.8GB
Will 2014 expected expected
Williamson 2011 ZIP 6.3GB ZIP 18GB XML ZIP ZIP
Winnebago 2007 ZIP 8.1GB ZIP 37.6GB XML ZIP
Woodford 2012 ZIP 12.7GB ZIP 17.5GB XML ZIP ZIP ZIP 9.43 GB ZIP 31.0 GB ZIP 46.4 GB


Data Definitions

Digital Surface Model (DSM) image for comparison
Digital Surface Model (DSM)
Digital Terrain Model (DTM) image for comparison
Digital Terrain Model (DTM)
Digital Terrain Model (DTM) image for comparison
Digital Elevation Model (DEM)
Digital Terrain Model (DTM) image for comparison
LAS Point Cloud

Available LiDAR data for Illinois are listed below. These collections are organized by county and listed alphabetically with the year of collection listed first. If there is no year next to the county name, this collection is yet to be acquired. If the data is listed as “By Request” then this data is available by request only and a “Help Request Form” must be completed and submit.

Datasets in ArcGrid format are available for selected Illinois counties. The original, classified LiDAR data point cloud has been processed to create a digital terrain model (DTM) and a digital surface model (DSM) for each county. Additionally, each county .zip file contains an associated shaded relief model, or ‘hillshade’, an ArcGIS v.10.1 .mxd file, and also ArcGrid pyramid files and statistics to facilitate display and analysis. This zip file includes the LiDAR data point cloud processed into created digital terrain models (DTM) and a digital surface models (DSM) for each county. Additionally, each county .zip file contains an associated shaded relief model, or ‘hillshade’, an ArcGIS v.10.1 .mxd file, and also ArcGrid pyramid files and statistics to facilitate display and analysis.

Comparison of DSM and DTM


DSM: all returns
Processing all returns in the classified point cloud that represent both the ground surface and aboveground features (buildings, roadways and overpasses, vegetation, etc.) produces a DSM. A DSM is commonly referred to as the ‘First Returns’ reflective surface model.


DTM: ground returns with hydrologic breaklines
When only the ground returns in a classified point cloud are used, the resulting hydro-flattened grid of bare-earth elevations is a DTM. Also, lake surfaces are smoothed and stream courses are conditioned for downhill flow using breakline data. This subset of the processed returns from the airborne laser sensor represent the ground surface and is commonly referred to as the ‘Bare Earth’ point cloud.


DEM: ground returns without hydrologic breaklines
When hydro-flattening is not imposed during processing of the ground returns, either because of missing or insufficient breakline data, the resulting Bare Earth elevation grid is classified as a DEM.


A public file format for viewing the LiDAR point cloud data.  Each data point is recorded with precise horizontal position, vertical elevation, and other attribute values. 


A file that describes the content, quality, condition, origin and other characteristics of the LiDAR data collection. The Metadata file also includes the appropriate citation to use when citing the Lidar data. Generalized metadata has been produced for each county DTM/DEM and DSM derivative data product, which can be accessed by clicking on a selected grid file using ArcCatalog. Be certain you have first selected on the ArcCatalog toolbar the ‘FGDC CSDGM Metadata’ option under Customize > ArcCatalog Options > Metadata. Please refer to the Readme file within each county ZIP download file for additional distribution information.

Tile Index
A GIS shapefile of the point cloud tile boundaries with tile name.  This file is helpful to view if you are interested in a smaller subset of the data to select specific tile names.

Hydrological boundary lines that define streams, shorelines, and dams. These are a linear GIS feature that describes a change in the smoothness or continuity of a surface. These allow us to create Hydro –enforced Digital Terrain Models (DTM).

DAT/DGN/TIn Available
This column will be checked off if there are available DAT,DGN or TIN files available for this collection.

Other Projects

Illinois River Floodplain LiDAR Sample - 2009-2011New

This data is being provided as a sample of a larger data set. The entire project area will become available at a later data. This data is provided in preliminary status; data deliverables for the entire project area are being reprocessed, to correct errors as specified in the "Illinois River USGS LiDAR Quality Assessment Report." Please read the Quality Assessment Report before using this data sample in any applications.

          Illinois River Hennepin/Peoria Area Sample Data Package - ZIP  1.44 GB

          Illinois River USGS LiDAR Quality Assessment Report - PDF  1.96 MB


Terms of Use

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, 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 of the records metadata.

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.