Elevation of the base of the Barlow Limestone

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Illinois State Geological Survey
Publication_Date: 20091201
Title: Elevation of the base of the Barlow Limestone
Edition: 20091201
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: ISGS Oil and Gas GIS Database
Issue_Identification: BaseBarlow_Elev_20ft_Ln_Dec09
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Online_Linkage: https://www.isgs.illinois.edu/
Description:
Abstract:
This datafile shows the general elevation of the base of the Barlow Limestone in Illinois. These 20- and/or 100-foot isolines were contoured using Geographix and Z-map Plus software. The contours were created using over 50,000 data points from the ISGS Oracle database. The data covers only those portions of the state where the formation is present and does not include any coverage outside of Illinois where the formation may be present. The data was contoured using fault lines for control and manual adjustments were made to the contours as a final refinement of the computer created contours. This data set is intended for use at a scale of 1:100,000 or greater.
Purpose:
This data set was created as part of an effort to update some of the ISGS map products utilizing new data and software capabilities. This data set was developed in order to create an updated version of the map published by H.M. Bristol in 1968. These data are appropriate for use in local and regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2008
Currentness_Reference: Final review and editing of data performed Fall 2008.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -90.075761
East_Bounding_Coordinate: -87.496914
North_Bounding_Coordinate: 40.006144
South_Bounding_Coordinate: 37.227563
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Illinois
Theme_Keyword: geology
Theme_Keyword: oil
Theme_Keyword: gas
Theme_Keyword: elevation
Theme_Keyword: structure
Theme_Keyword: Barlow
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.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Instructions:
Please refer to the contact information in the Distribution Information section.
Native_Data_Set_Environment: ArcGIS 9.2
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>
Online_Linkage: <http://illinois.edu>
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The attributes of the original ArcGIS dataset were reviewed throughout the course of the project by visual inspection of the contours for elevation anomalies and comparison with earlier published structure maps. Original point-source data associated with anomalies were checked for accuracy of location, correlation, and reporting of surface and bed elevation. These reviews were performed in an iterative fashion by two or three individuals.
Accuracy of point-source information is variable, depending on the source materials and the geologist. Some logs are precise measurements of depth, others may have errors or be rounded. Geologic correlations are, of course, open to other interpretations. Anomalous data from driller?s logs and drilling time logs were discarded, as no rectification could be made. Other anomalous data points were checked utilizing data in the corresponding well folder in the Geologic Records Unit of the ISGS. In most cases, if the anomalous data point did not have a geophysical log that could be reviewed the data point was discarded.
Formal evaluation tests have not been run, but repeated hands-on experience using the data for real-life applications has proven the quality of the database. Experience suggests that a small percentage of the data may contain errors that involve gross mis-location of points or mis-correlation of the formation in question.
This map did not make use of all available point-source data, but traces of previously mapped faults were used to control or modify contours. The fault traces were obtained by using ArcGIS software to georeference large scale maps of the Beech Creek (Barlow) formation and then digitize the fault traces present on the map. Fault lines were then examined to see how the new data affected their portrayal. Fault lines were corrected, and a few new faults were added, as indicated by the data. Only those faults mappable on the Beech Creek (Barlow) Limestone are shown on this map. Faults were assumed to be vertical in the contouring process.
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.
Completeness_Report:
The point-source data was compiled by ISGS staff from paperwork submitted to the state by oil companies operating in the state of Illinois. These files are archived within the Geologic Records Unit of the ISGS. This subset was compiled from the ISGS?s Oracle database. No attempt has been made to compile all available data. This file does not represent all the well records on file at the ISGS, nor should the absence of data for the formation in question be interpreted to mean that the formation is not present.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
This is a generalized depiction of regional ground condition. Horizontal positional accuracy of the original point-source data is generally unknown. There is considerable variability depending on the source material. Some holes have surveyed locations and are accurate to within a foot, others have only description to the nearest forty acres. Overall, the database administrator estimates that most points are within 500 feet of their correct locations, but no scientific tests have been done to verify this.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Illinois State Geological Survey
Title: ISGS Wells and Borings database
Geospatial_Data_Presentation_Form: tabular digital data
Other_Citation_Details: This database is updated daily.
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1801
Ending_Date: present
Source_Contribution: All location and attribute information.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Bristol, H.M.
Publication_Date: 1968
Title:
Structure on the base of the Mississippian Beech Creek (Barlow) Limestone in Illinois
Geospatial_Data_Presentation_Form: map and report
Series_Information:
Series_Name: Illinois Petroleum
Issue_Identification: 88
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: Fault lines and general geological control.
Process_Step:
Process_Description:
Extraction of point-source data: Data points that contained an x/y coordinate and an elevation of the Beech Creek (Barlow) Limestone were extracted from the ISGS Oracle database and formatted for Z-Map Plus software program.
Contouring of Elevation: Elevation of point-source data was contoured using Halliburton?s Z-Map Plus software. Final grid size was determined through trial-and-error methodology, however, final grid cell size is currently unknown due to the loss of personnel, and loss of data as result of server issues. Comparison to preliminary contouring attempts suggests that the final grid cell size was less than 5,000 feet, and could potentially have been in the range of 1,000 to 2,000 feet. Default settings were used for all other contouring parameters. Data was contoured using fault lines for control, and faults were assumed to be vertical in the contouring process.
Post-contouring Processing: 1. The Z-Map Plus .DAT file was exported and imported into Geographix software package. 2. The .DAT file was then exported from Geographix as an ESRI compatible shapefile. 3. The shapefile was opened in ArcGIS and clipped using polygon shapefile of the extent of the formation in Illinois.
Process_Date: 2008
Process_Step:
Process_Description:
Final shapefile loaded into institutional spatial database, and made available for public display via the ILOIL interactive map interface, <http://www.isgs.illinois.edu/sections/oil-gas/launchims.shtml> .
Process_Date: 20091201
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000001
Longitude_Resolution: 0.000001
Geographic_Coordinate_Units: Decimal degrees
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
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: BaseBarlow_Elev_Ln
Attribute:
Attribute_Label: FID
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: ELEVATION
Attribute:
Attribute_Label: SHAPE_LENG
Attribute:
Attribute_Label: SHAPE
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: SHAPE_Le_1
Overview_Description:
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Information Office, Illinois State Geological Survey (ISGS), a division of the Prairie Research Institute 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: 217-244-2414
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
Resource_Description:
The basic product in ESRI shapefile format includes the contour elevation lines and values, and is available free of charge.
Additional detailed information about these wells and borings is available free of charge online at the Illinois State Geological Survey web site (<http://www.isgs.illinois.edu/>) in the ILOIL (oil and gas) interactive map service.
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: 20110927
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Instructions:
Please refer to the contact information in 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
Metadata_Review_Date: 20120424
Generated by mp version 2.9.12 on Wed Aug 04 14:19:40 2021