Digital Elevation Model (DEM) of Illinois at 1:250,000

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Abert, Curtis C.
Publication_Date: 1995
Title: Digital Elevation Model (DEM) of Illinois at 1:250,000
Edition: 20060926
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: ISGS GIS Database
Issue_Identification: GISDB.IL_DEM_301FT_RAS
Publication_Information:
Publication_Place: Champaign, Illinois, USA
Publisher: Illinois State Geological Survey
Online_Linkage: <http://www.isgs.illinois.edu/>
Online_Linkage: <http://illinois.edu>
Description:
Abstract:
This raster dataset consists of edge-matched USGS 1:250,000 DEM tiles for Illinois. Cell size is 301 feet and cell values are elevations in meters above mean sea level rounded to the nearest integer. The data include all of Illinois and extend approximately nine miles beyond the state boundary. Some elevation data at the edges of individual DEM tiles were smoothed to remove edge-matching faults.
Purpose:
These data were assembled to provide a statewide database of surface elevation points suitable for analyses of statewide geologic phenomena associated with elevation. The data have been used to generate slope data and shaded relief images, and are appropriate for other such regional applications.

These data are appropriate for use in local and regional elevation analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set can serve as an important base cartographic and analytical element for many types of maps. The data set was not and is not intended as a substitute for surveyed elevations, such as can be determined by a registered Public Land Surveyor.

Supplemental_Information:
This dataset was transferred to storage in ArcSDE on 20060926. This edition is designated 20060926. The previous edition (1.0) was an ArcInfo grid called allst-int.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Currentness_Reference: Date of additional ISGS processing to USGS data.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -91.7023
East_Bounding_Coordinate: -87.1183
North_Bounding_Coordinate: 42.6501
South_Bounding_Coordinate: 36.8031
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: geology
Theme_Keyword: elevation
Theme_Keyword: DEM
Theme_Keyword: digital elevation model
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Illinois
Access_Constraints:
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.

Use_Constraints:
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.

Point_of_Contact:
Contact_Information:
Contact_Instructions: Please refer to the Distribution Information section.
Native_Data_Set_Environment: ArcSDE 9.1 on Oracle 10g
Cross_Reference:
Citation_Information:
Title: ISGS Terms of Use
Online_Linkage: <http://www.isgs.illinois.edu>
Cross_Reference:
Citation_Information:
Title: University of Illinois Web Privacy Notice
Online_Linkage: <http://www.vpaa.uillinois.edu/policies/web_privacy.cfm>
Cross_Reference:
Citation_Information:
Title:
University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4)
Online_Linkage: <http://www.uillinois.edu/trustees/rules.cfm#sec34>
Cross_Reference:
Citation_Information:
Title:
Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign
Online_Linkage: <http://www.fs.uiuc.edu/cam/CAM/viii/viii-1.1.html>

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Derived from United States Geological Survey 1:250,000-scale 3 arc-second Digital Elevation Model data. Contact the USGS for attribute accuracy of the source DEM data. Some elevation data at the edges of individual DEM tiles were smoothed for edge-matching purposes.
Logical_Consistency_Report: Not applicable to grids.
Completeness_Report:
USGS 3 arc-second DEMs projected into Lambert Conformal Conic projection were resampled to an approximate 301 foot cell size.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Assumed to be as accurate as USGS 3 arc-second DEMs.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: United States Geological Survey
Publication_Date: unknown
Title: 1:250,000 Digital Elevation Models
Geospatial_Data_Presentation_Form: model
Series_Information:
Series_Name: USGS DEMs
Issue_Identification:
All tiles necessary to provide complete coverage of Illinois, including a 9 mile buffer
Publication_Information:
Publication_Place: unknown
Publisher: USGS
Source_Scale_Denominator: 250000
Type_of_Source_Media: digital files
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1967
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: elevation grid cells
Process_Step:
Process_Description:
The ultimate source of the data used to create this data set are United States Geological Survey 1:250,000 3-arc-second Digital Elevation Model Data (DEMs). All or parts of 29 DEM tiles are needed for contiguous coverage of Illinois. The individual DEMs were converted to ARC/INFO lattices (with the ARC LATTICEMERGE command), projected (PROJECT), and clipped to an area of at least 9 miles beyond the state boundary (LATTICECLIP), and stored as an Arc/Info grid.
Process_Date: 1995
Process_Step:
Process_Description:
This dataset was transferred to storage in ArcSDE on 20060926. This edition is designated 20060926. The previous edition (1.0) was an ArcInfo grid called allst-int.

Metadata updated.

Process_Contact:
Contact_Information:
Contact_Person_Primary:

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 7021
Column_Count: 4240
Vertical_Count: 1

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Standard_Parallel: 33.000000
Standard_Parallel: 45.000000
Longitude_of_Central_Meridian: -89.500000
Latitude_of_Projection_Origin: 33.000000
False_Easting: 2999994.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 301.930524
Ordinate_Resolution: 301.930524
Planar_Distance_Units: survey feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.400000
Denominator_of_Flattening_Ratio: 294.978698
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: unknown
Altitude_Resolution: 1.000000
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: IL_DEM_301FT
Attribute:
Attribute_Label: ObjectID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Value
Attribute_Definition: Elevation in meters
Attribute:
Attribute_Label: Count
Overview_Description:
Entity_and_Attribute_Overview:
Cell values are elevation above mean sea level in meters rounded to the nearest integer.
Entity_and_Attribute_Detail_Citation: none

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
Contact_Address:
Address_Type: mailing and physical address
Address: 615 East Peabody Drive
City: Champaign
State_or_Province: Illinois
Postal_Code: 61820
Country: USA
Contact_Voice_Telephone: 217-333-4747
Contact_TDD/TTY_Telephone: 217-785-0211
Contact_Electronic_Mail_Address: isgs@isgs.illinois.edu
Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
Distribution_Liability:
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.

Technical_Prerequisites:
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.

Metadata_Reference_Information:
Metadata_Date: 20090224
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Instructions: Please refer to the Distribution Information section.
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints:
The access constraints as stated for the data apply also to the metadata. Refer to the Access Constraints section of the Identification Information section.
Metadata_Use_Constraints:
The use constraints as stated for the data apply also to the metadata. Refer to the Use Constraints section of the Identification Information section.
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Illinois Natural Resources Geospatial Data Clearinghouse

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