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These acquisitions of the LiDAR data and its derivatives were made possible by Dupage County. 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 Terrain Model (DTM) data was produced all or in part from LiDAR information as of 2014. The LiDAR derived DTM covers Dupage County, Illinois and include inland streams, rivers, lakes ponds and tidal features. These data are appropriate for use in local and regional analysis. This dataset was contracted as 4 ppsm LiDAR point cloud data</SPAN></P><P><SPAN>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>
IL_DuPage_DTM_2014
Recommended Publishing Citation:
Illinois Height Modernization Program, Dupage County, 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 March 30, 2016)
Elevation data
LiDAR
LAS
Bare Earth
DEM
Breakline
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>None. However, users should be aware that temporal changes may have occurred since </SPAN></P><P><SPAN>this data set was collected and that some parts of this data may no longer represent actual</SPAN></P><P><SPAN>surface conditions. This report is released as a draft or preliminary version. Users should</SPAN></P><P><SPAN>not use this data for critical applications without a full awareness of its limitations.</SPAN></P><P><SPAN /></P><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. </SPAN></P><P><SPAN /></P><P><SPAN>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. </SPAN></P><P><SPAN /></P><P><SPAN>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. </SPAN></P><P><SPAN /></P><P><SPAN>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. </SPAN></P><P><SPAN /></P><P><SPAN>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>
Dupage County, and Quantum Spatial Inc.
-88.2597339225
-87.9182261179
41.9967349365
41.7271988659
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.0.4322
ISGS QAQC Review completed on Jan. 14, 2016. Collection Date: 4/21/14 - 5/5/14. 1. In some areas, the extent of the LiDAR data does not extend all the way out to the supplied county boundary.
2. There are several breaklines where the elevation difference between the breakline and the water surface elevation that is over the threshold.
As seen on the DSM on tile #0969 - #0697 - #0891 - #0913 #0782 - #0652 - #1052 3. On tile #0737 and #0738 there is a breakline that is misaligned. It does not align to the border of the lake but instead goes over the top of one and behind another one. 10. On tile #0737 and #0738 there is a breakline that is misaligned. It does not align to the border of the lake but instead goes over the top of one and behind another one. 4. There are several instances where portions of buildings have been classified as ground. As seen on tile #0838 - #809. As seen on tile #0794 where an above ground parking structure and its ramp have been classified as ground. As seen on tile #0656. As seen on tile #0766. As seen on tile #0640, where the ramp of a parking structure has been classified as ground. As seen on tile #0646, where a portion of a parking structure has been classified as ground. As seen on tile #0573, where a structure has been classified as ground. On tile #0661 a bridge has been misclassified as ground. 5. 3. The way that LiDAR reacts to water, the occasional erroneous return is to be expected. But when erroneous points are grouped together in large numbers over a water body, to the extent that they start to look like actual features, or makes the data look inaccurate, these are errors that need to be fixed. As seen on tile #0595. As seen on tile #0577, #0578, #0594, and #0595. As seen on tile #0572 and #0578. As seen on tile #0716. As seen on tile #1042. As seen on tile #0951 and #0974. As seen on tile #1088. As seen on tile #1114 and #1115. As seen on tile #1114. As seen on tile #1113 and #1123. As seen on tile #1122. As seen on tile #1113. To see a full report with screen shots describing - please contact ISGS @ info@isgs.illinois.edu.
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GRID
Raster
ISGS
Raster Grid Values
Specifications: USGS NGP Base Specification v1
Sensor: Leica ALS70 sensor SN7161
Max returns: 4
Nominal Point Spacing: 0.5
Lidar point density: 6.64
Flight Hieght: 3,139
Flight Speed: 150 knots
NAD_1983_2011_StatePlane_Illinois_West_FIPS_1202_Ft_US National Geodetic Survey (NGS) Geoid12A Lidar Accuracy: Horz. 0.0820 CLSFVA: 0.0820
Clscva: 0.1311
Svalctyp: Urban Svavalue: 0.0546 Class Accuracy:
Tall Grass/Agriculture: 0.1106 Brush/Scrub/Shrub: 0.1350
Woods/Forest: 0.1710
LAS Version 1.2 Overlap: To maintain high point density overage points were not indicated by class
Classes: 0: Never Processed 1: Processed, but unclassified
2: Bare-earth, Ground
7: Noise (low or high, manually identified, if needed) 9: Water
10: Ignored ground (Breakline proximity
ISGS
Raster Dataset
dataset
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20160405