Illinois State Geological Survey (ISGS), a division of the Prairie Research Institute of the University of Illinois
Unpublished Material
Digital Terrain Model (DTM) Perry County, Illinois. 2014.
raster digital data
http://www.isgs.illinois.edu
Recommended Publishing Citation:Illinois Height Modernization Program, Illinois State Geological Survey, and Federal Emergency Management Agency, 2002–2015, Illinois LiDAR county database: Illinois State Geological Survey
http://crystal.isgs.uiuc.edu/nsdihome/webdocs/ilhmp/ (accessed September 18, 2014)
This Digital Terrain Model (DTM) data was produced all or in part from LiDAR information as of 2014. The LiDAR derived DTM covers Perry County, Illinois and include inland streams, rivers, lakes ponds and tidal features. These data are appropriate for use in local and regional analysis. This data set has a vertical accuracy of 6.18 centimeters RMSEz, horizontal accuracy of 0.6 meters and point spacing of 0.95 meters. 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
20140417
unknown
20140420
unknown
ground condition
Unknown
-89.634
-89.094
38.244
37.939
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
Perry County
None
2014
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.
Illinois Department of Natural Resources, Illinois State Geological Survey, Illinois Department of Transportation and Surdex Corp.
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
Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign
http://www.cam.illinois.edu/viii/VIII-1.1.htm
ISGS Terms of Use
http://www.isgs.illinois.edu
University of Illinois Web Privacy Notice
http://www.vpaa.uillinois.edu/policies/web_privacy.cfm
University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4)
http://www.uillinois.edu/trustees/rules.cfm#sec34
All files are inspected to ensure that they conform to the specified file naming conventions.
There are visible flight lines, but the elevation difference between the two is within industry standards. As seen on the DTM on tile #25750510.
Random high are visible on the DSM, which should have been categorized as noise points (LAS Class 7). As shown on DSM on tile #25300560. 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.
There are visible flight lines, but the elevation difference between the two is within industry standards.
As seen on the DTM on tile #25750510:
All files load in their correct geographic position and conform to the USGS LiDAR Base Specifications Version 1.0.
Complete. LiDAR points have been classified to either unclassified, ground, vegetation, buildings, low points, noise, key-point or water class.
2 ft RMSE
0.203 feet RMSE
USGS Quality Level 3 or better
The LAS Data must meet a Fundamental Vertical Accuracy (FVA) equal to or less than 0.410 feet (12.5cm ) RMSEz.
Acquisition was completed in mid April 2014 using a twin engine Cessna 335 equipped with a Leica ALS70HP. Flight plan parameters were based on 9500 feet AGL, 40 deg FOV, 185,000 pulse rate, 30% sidelap, 0.95 meter NPS. Crews based out of three airports; KMDH IN Carbondale, KPJB in Pinckneyville and H96 in Benton and worked multiple shifts per day to capture the data in a tight window due to emerging vegetation and concerns around flooding late in the Spring of 2014. All flights have calibration lines flown at beginning and end of flight perpendicular to lines captured during that mission. Base stations were continuously running during missions and placed so flight baseline never exceeds 25 miles. GPS-IMU captured during flight was processed using Waypoint's Inertial Explorer software. The bare-earth Lidar data was processed to USGS (NGP) Base Lidar Specifications V1.0 using the Terrasolid software suite. LiDAR point was initally processed with macros to locate bare earth ground, buildings and three classes of vegetation but was manually reviewed by experienced technicians in TerraScan or LP360 software for proper point classifciations in LAS tile format. Derivative product formats such as *.DAT, *.DGN, ESRI raster grid and TIN formats were produced using ESRI, Microstation and other software formats. Hydro features were collected on streams and rivers 100~ feet or wider and on lakes 2~ acres or larger. These lines were hydro flattened into the Lidar data and delivered in ESRI geodatabase file format
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.
20141208
Unknown
Raster
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_West_FIPS_1202_Feet
North American Vertical Datum of 1988
0.01
survey feet
Explicit elevation coordinate included with horizontal coordinates
20150320
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
FALSE
file://X:\counties\perry\perry_dtm
Local Area Network
perry_dtm
002
2450000.000881
2605001.000881
464999.999871
575000.999871
1
Projected
GCS_NAD_1983_2011
Linear Unit: Foot_US (0.304801)
NAD_1983_2011_StatePlane_Illinois_West_FIPS_1202_Ft_US
<ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.5'><WKT>PROJCS["NAD_1983_2011_StatePlane_Illinois_West_FIPS_1202_Ft_US",GEOGCS["GCS_NAD_1983_2011",DATUM["D_NAD_1983_2011",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",2296583.333333333],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-90.16666666666667],PARAMETER["Scale_Factor",0.9999411764705882],PARAMETER["Latitude_Of_Origin",36.66666666666666],UNIT["Foot_US",0.3048006096012192]],VERTCS["NAVD_1988",VDATUM["North_American_Vertical_Datum_1988"],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Foot_US",0.3048006096012192]]</WKT><XOrigin>-16150900</XOrigin><YOrigin>-46131100</YOrigin><XYScale>137249422.94257641</XYScale><ZOrigin>-100000</ZOrigin><ZScale>3048.0060960121923</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.0032808333333333331</XYTolerance><ZTolerance>0.0032808333333333331</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>103038</WKID><LatestWKID>6457</LatestWKID></ProjectedCoordinateSystem>
32
FALSE
None
1
GRID
TRUE
continuous
floating point
-3.4028235e+038
20180420
12100000
20180420
12100000
150000000
5000
FGDC
1.0
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
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.5.1.7333
IL_Perry_DTM_2014
Recommended Publishing Citation:
Illinois Height Modernization Program, Illinois State Geological Survey, and Illinois Department of Transportation, Illinois Department of Natural Resources, 2002–2016, Illinois Height Modernization Program (ILHMP): LiDAR data: Illinois State Geological Survey http://clearinghouse.isgs.illinois.edu/ (accessed March 30, 2016)
1
-89.634
-89.094
38.244
37.939
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 Terrain Model (DTM) data was produced all or in part from LiDAR information as of 2014. The LiDAR derived DTM covers Perry County, Illinois and include inland streams, rivers, lakes ponds and tidal features. These data are appropriate for use in local and regional analysis. This data set has a vertical accuracy of 6.18 centimeters RMSEz, horizontal accuracy of 0.6 meters and point spacing of 0.95 meters. 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>
Illinois Department of Natural Resources, Illinois State Geological Survey, Illinois Department of Transportation and Surdex Corp.
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>
Raster Dataset
dataset
EPSG
8.9.3(10.3.1)
2
1
0
2450000.000881 464999.999871
2450000.000881 575000.999871
2605001.000881 575000.999871
2605001.000881 464999.999871
2527500.500881 520000.499871
51667
3.000000
36667
3.000000
perry_dtm
601.999695
325.701141
32
20180420