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

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

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

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: none

Use_Constraints:

Reproduction or redistribution of copyrighted digital data sets or products derived therefrom outside of licensee's organization or entity is expressly forbidden. The only exception is redistribution to consultants working for the licensee, and then only for purposes, related to work for the licensee. Such consultants may not further reproduce or redistribute these data sets. None of these data shall be electronically duplicated on magnetic or optical media for use by others, in whole or in part, without permission of the appropriate custodial division within DNR.

Any hardcopies utilizing DNR data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent DNR data sets, nor to imply that changes they made were approved by DNR.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Instructions: Please refer to the distribution information.

Native_Data_Set_Environment: ArcGIS 9.1 on Windows

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:

Illinois State Geological Survey, Geospatial Analysis and Modeling Section

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.uiuc.edu

Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday - Friday, U.S. Central Time

Distribution_Liability:

The Illinois Department of Natural Resources (DNR) provides these geographic data "as is." DNR makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. DNR further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of DNR, no warranty, expressed or implied, is made by DNR regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.

In no event shall the DNR have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by DNR.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Technical_Prerequisites:

The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, the ESRI shapefile format can be imported into many different GIS software packages. It is expected that customers who order this data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind.

Metadata_Reference_Information:

Metadata_Date: 20060926

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Instructions: Please refer to the distribution information.

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: None.

Metadata_Use_Constraints: None.

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile

Illinois Natural Resources Geospatial Data Clearinghouse