The data were published in 1999 on an ISGS Illinois Geologic Quadrangle entitled Surficial Geology Map, Alton Quadrangle (Illinois Portion) Madison County, Illinois by David Grimley. These data do not include all the information on the published map. Refer to the published map for a complete explanation of the Quaternary geology of the Alton quadrangle.
The nominal scale is 1:24,000.
Grimley, David A. , 1999, Loess Thickness Contours in the Alton 7.5-minute Quadrangle (Illinois portion), Illinois: ISGS Digital Database none, Illinois State Geological Survey, Champaign, Illinois.This is part of the following larger work.
Grimley, David A. , 1999, Surficial Geology Map, Alton Quadrangle (Illinois portion), Madison County, Illinois: Illinois Geologic Quadrangle (IGQ) Alton SG, Illinois State Geological Survey, Champaign, Illinois.
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.
Arc attributes:
THICKNESS: The loess thickness. The domain of values is "20" or "30".
Mapping contributions: E.D. McKay GIS processing: C. Abert, D. Nelson Documentation: D. Nelson QA/QC: D. Nelson, C. Abert, R. Krumm
Illinois State Geological Survey
GIS Database Administrator
615 East Peabody Drive
Champaign, Illinois 61820
USA
217-333-4747 (voice)
isgs@isgs.uiuc.edu
- Hours_of_Service: 8:00 a.m. - 5:00 p.m. Central Time, Monday-Friday
- Contact_Instructions:
- When contacting us, please have this metadata file readily available so we can identify the data set of interest and the individual most appropriate to assist you.
These data are intended to be a regional overview of loess thickness in the Alton quadrangle. The data are appropriate regional thematic analysis. The data are not appropriate as a geodetic or engineering base, nor do they replace the need for detailed site-specific studies.
No attribute accuracy report.
No horizontal positional accuracy report.
No vertical positional accuracy report.
No completeness report. Mapping techniques are described on the published map.
A logical consistency review was performed in May, 2002. The following checks were made:
Data set was DESCRIBED and coverage files listed to determine the feature types present. In this data set, the following feature types were found and checked: arcs and nodes. The presence of spatial indices was also checked.
For the AAT file, each ITEM was checked for the following:
- DOMAIN of allowable values - adherence of values to the DOMAIN - definition of ITEMS - requirement of all UNIQUE values for an item - logic of ITEMS REDEFINED over other ITEMS - length of ITEM name as regards conversion to shape fileBUILD statuses of data sets were checked, as were LABELERRORS and NODEERRORS (where appropriate), and PROJECTION definition.
The presence of a DBLBND file was verified.
The presence and location of TICS were checked.
Chain-node topology present. There are 34 dangling nodes that are consistant with the data and expected. Boundary values appropriate for map projection and map units. "Fuzzy" tolerance is zero and therefore meaningless. COVER-ID values were recalculated to be unique. There are no attribute values outside the appropriate domains.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints:
- Reproduction or redistribution of copyrighted digital data sets or products derived therefrom outside of licensee 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.
These data are not to be used for commercial profit.
These data should not be used at scales greater than 1:24,000.
Illinois State Geological Survey
GIS Database Administrator
615 East Peabody Drive
Champaign, Illinois 61820
USA
217-333-4747 (voice)
isgs@isgs.uiuc.edu
- Hours_of_Service: 8:00 a.m. - 5:00 p.m., Central Time, Monday-Friday
- Contact_Instructions:
- When contacting us, please have this metadata file readily available so we can identify the data set of interest and the individual most appropriate to assist you.
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.
Illinois State Geological Survey
c/o REQUIRED: The person responsible for the metadata information.
GIS Database Administrator
615 East Peabody Drive
Champaign, Illinois 61820
USA
217-333-4747 (voice)
isgs@isgs.uiuc.edu
- Hours_of_Service: 8:00 a.m. - 5:00 p.m. Central Time, Monday-Friday
- Contact_Instructions:
- When contacting us, please have this metadata file readily available so we can identify the data set of interest and the individual most appropriate to assist you.