Mosaic of Illinois 7.5-minute Digital Raster Graphic (DRG) Images

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Illinois State Geological Survey
Publication_Date: 20030815
Title:
Mosaic of Illinois 7.5-minute Digital Raster Graphic (DRG) Images
Edition: 20030815
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: ISGS GIS Database
Issue_Identification: GISDB.IL_DRG_MOSAIC_24K_RAS
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geoligical Survey
Online_Linkage: <http://www.isgs.illinois.edu/>
Online_Linkage: <http://illinois.edu>
Description:
Abstract:
This is a statewide ArcSDE Raster Mosaic of USGS DRG images of 7.5-minute topographic quadrangles occurring in Illinois. These are unmodified DRG images as distributed by the USGS, except (1) collar information has been removed for map tiling and (2) the data have been reprojected to the customary ISGS Lambert Conformal Conic projection (NAD 27). The map scale is 1:24,000. The map units are meters. The images were scanned at 250 dpi, giving an approximate raster cell resolution of 2.5 meters.
Purpose:
This raster mosaic was created to provide rapid access to a seamless, statewide layer of Illinois DRGs, which are very useful as a general spatial reference.

These data are appropriate for use in local and regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set serves as an important base cartographic element for many types of maps and has been widely distributed and used outside the ISGS. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a reference base layer for maps, the data set has no legal basis in the definition of boundaries or property lines.

Supplemental_Information: These data were added to the ISGS SDE database in 200308.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: varies
Currentness_Reference: publication dates of source topographic maps
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -91.710016
East_Bounding_Coordinate: -87.248974
North_Bounding_Coordinate: 42.633004
South_Bounding_Coordinate: 36.856194
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: digital raster graphic
Theme_Keyword: drg
Theme_Keyword: quadrangle
Theme_Keyword: usgs
Theme_Keyword: topographic
Theme_Keyword: image
Theme_Keyword: imageryBaseMapsEarthCover
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: No report.
Logical_Consistency_Report: No report.
Completeness_Report: No report.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
It is believed that import into the SDE raster mosaic using LZ77 compression preserved the exact horizontal positions of the source DRGs. However, given that the source DRGs were at one time reprojected from the "as delivered" UTM coordinate system to the customary ISGS Lambert Conformal Conic projection, some resampling and pixel shift does exist.
Lineage:

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 254510
Column_Count: 145924
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: 8.199797
Ordinate_Resolution: 8.199829
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

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Each raster entity or pixel contains a color index from 0 through 12 referencing a color palette of RGB values from 0 through 255 in which the standard colors used in the DRG are defined.

USGS DRG Color Palette

Digital Number Color Red Green Blue

0 Black 0 0 0 1 White 255 255 255 2 Blue 0 151 164 3 Red 203 0 23 4 Brown 131 66 37 5 Green 201 234 157 6 Purple 137 51 128 7 Yellow 255 234 0 8 Light Blue 167 226 226 9 Light Red 255 184 184 10 Light Purple 218 179 214 11 Light Grey 209 209 209 12 Light Brown 207 164 142

Entity_and_Attribute_Detail_Citation: USGS Draft Standards for Digital Raster Graphic

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

Generated by mp version 2.8.25 on Wed Apr 08 11:01:13 2009