Generalized Statewide Location of Major Bedrock, Sand and Gravel, and Potential Shallow Aquifers in Illinois

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: Illinois State Geological Survey

Publication_Date: Unpublished Material

Title:

Generalized Statewide Location of Major Bedrock, Sand and Gravel, and Potential Shallow Aquifers in Illinois

Edition: 20040401

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: ISGS GIS Database

Issue_Identification: GISDB_HYDRO.IL_Major_Aquifers

Publication_Information:

Publication_Place: Champaign, Illinois

Publisher: Illinois State Geological Survey

Description:

Abstract:

This feature dataset contains feature classes that show the general areal extent of major bedrock aquifers to various depths, major sand and gravel aquifers, and potential water-bearing unconsolidated strata to a depth of 50 feet.

With the exception of GISDB_HYDRO.IL_Shallow_Coarse_Materials_Py, the attribute information is limited to a simple binary code indicating the area is or is not an aquifer. The shallow coarse materials feature class was derived from the statewide stack-unit map and contains stack-unit designations.

The data are in the Geographic Coordinate System, decimal degrees, NAD83.

Most of the feature classes have a scale of 1:500,000. GISDB_HYDRO.IL_Shallow_Coarse_Materials_Py has a scale of 1:250,000.

Please refer to the metadata for the individual feature classes.

Purpose:

The datasets are intended to identify areas of Illinois where major bedrock and sand and gravel aquifers exist, and where other shallow water-bearing materials may exist.

These data are appropriate for use in regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The datasets were not and are not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS, the data have no legal basis in the definition of boundaries or property lines.

Supplemental_Information:

In April 2004 the source coverages were transitioned to storage in an Oracle RDBMS using the ArcSDE geodatabase model. The result (this version) is designated edition 20040401. Prior to this time the feature classes were stored as separate coverages in the ISGS GISDB archive.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1985

Ending_Date: 1986

Currentness_Reference: Dates of source materials

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -91.4244

East_Bounding_Coordinate: -87.3840

North_Bounding_Coordinate: 42.4951

South_Bounding_Coordinate: 36.9540

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: aquifer

Theme_Keyword: groundwater

Theme_Keyword: water

Theme_Keyword: hydrology

Theme_Keyword: hydrogeology

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 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_Voice_Telephone: 217-333-4747

Contact_Electronic_Mail_Address: isgs@isgs.uiuc.edu

Contact_Address:

Address_Type: mailing address

Address: 615 East Peabody Drive

City: Champaign

State_or_Province: Illinois

Postal_Code: 61820

Country: USA

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

Contact_Organization_Primary:

Contact_Organization: Groundwater Section, Illinois State Geological Survey

Contact_TDD/TTY_Telephone: 217-785-0211

Native_Data_Set_Environment: ArcSDE 8.2 on Oracle 9i

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Please refer to the metadata for the individual feature classes.

Logical_Consistency_Report:

Please refer to the metadata for the individual feature classes.

Completeness_Report:

Please refer to the metadata for the individual feature classes.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Please refer to the metadata for the individual feature classes.

Lineage:

Process_Step:

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Process_Description:

The source coverages (...hydro/aq*) were imported into an ArcSDE enterprise geodatabase feature dataset for storage. Previously they were stored as individual coverages. The data were reprojected from the customary ISGS Lambert Conformal Conic projection (NAD27) to a geographic coordinate system (longitude, latitude) in decimal degrees (NAD83).

The various coverage feature classes were imported using ArcCatalog 8.3. Some unnecessary data fields were dropped. Refer to the feature class-specific metadata for details.

Prior to import, the spatial reference of the data set was changed to Geographic, decimal degrees, NAD83 in double precision.

Also at this time, this metadata file was created.

Process_Date: 20040401

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 3848

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 84

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 71

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 7

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 113

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 208

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Geographic:

Geographic_Coordinate_Units: Decimal degrees

Latitude_Resolution: 0.000001

Longitude_Resolution: 0.000001

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Please refer to the metadata of the respective feature classes for specifics on attributes and their values.

Entity_and_Attribute_Detail_Citation: none

Detailed_Description:

Entity_Type:

Entity_Type_Label: GISDB_HYDRO.IL_Shallow_Coarse_Materials_Py

Detailed_Description:

Entity_Type:

Entity_Type_Label: GISDB_HYDRO.IL_Maj_Bedrock_Aq_Lt_300_Ft_Py

Detailed_Description:

Entity_Type:

Entity_Type_Label: GISDB_HYDRO.IL_Maj_Bedrock_Aq_Lt_500_Ft_Py

Detailed_Description:

Entity_Type:

Entity_Type_Label: GISDB_HYDRO.IL_Maj_Bedrock_Aq_Gt_500_Ft_Py

Detailed_Description:

Entity_Type:

Entity_Type_Label: GISDB_HYDRO.IL_Maj_Sand_And_Gravel_Aq_Py

Detailed_Description:

Entity_Type:

Entity_Type_Label: GISDB_HYDRO.IL_Maj_Bedrock_Aq_Lt_300_Ft_Ln

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Instructions: Please refer to the dataset contact information.

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.

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: 20040401

Metadata_Contact:

Contact_Information:

Contact_Instructions: Please refer to the dataset contact information.

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Access_Constraints: None.

Metadata_Use_Constraints: None.

Metadata_Time_Convention: local time

Metadata_Extensions:

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

Profile_Name: ESRI Metadata Profile