Elevation Contours of the top of the Springfield Coal

Illinois State Geological Survey 1996 Elevation Contours of the top of the Springfield Coal 1.0 (Prior to 1995 no version numbers had been assigned to this coverage. vector digital data ISGS GIS Database sprfd_el Champaign, Illinois Illinois State Geological Survey GISDB_COAL_IL_Springfield_Elevation_Py withheld This datafile shows the general elevation of the top of the Springfield (No. 5) coal in Illinois. These 100-foot isolines were contoured by Earthvision software using 12,027 data points. The data was not contoured using fault lines for control and no manual adjustments were made to the contours to reflect the presence of known faults. Contours were adjusted in areas to eliminate crossing isolines of the elevation of the overlying Herrin Coal. Limited data were available in the north central, central, and western portions of the state. This data set is intended for use at a scale of 1:750,000. This data set was created as part of the ISGS GIS database to show general elevation of the Springfield (No. 5) Coal seam. The data are appropriate for regional analysis. 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 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. none en 1996 publication date of sources Complete Irregular -90.614948 -87.498703 41.488312 37.598317 -90.614948 -87.498703 37.598317 41.488312 none geology coal coal seams mineral resources structure none Illinois none Pennsylvanian none 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. These data are not to be used for commercial profit. Christopher P. Korose Illinois State Geological Survey - Coal Section mailing address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-7256 217-333-2830 Contact this individual ONLY for specific information about the use of this data set. For general questions about distribution, or availability of other data, please contact the Information Office as listed under the Distribution_Information section. ESRI ArcCatalog 9.2.2.1350 Shapefile The attributes of the original ArcInfo coverage were reviewed in 1996 by visual inspection of the contours for elevation anomolies and comparison with earlier published structure maps. Original point- source data associated with anomolies 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. There are no arc or polygon attribute values outside the appropriate value domains. Accuracy of point-source information is variable, depending on the source materials and the geologist. Some logs are precise measurements of thickness and depth, others may have errors or be rounded. Geologic correlations are, of course, open to other interpretations. In general: measurements from core descriptions and coal test geophysical logs are accurate to within fractions of an inch; measurements from drillers logs may be accurate to within an inch to 5 feet, depending on the equipment used and the experience of the on-site geologist; measurements from oil test geophysical logs are accurate to within +/- one foot. Formal evaluation tests have not been run, but daily hands-on experience using the data for real-life applications has proven the quality of the database. Experience suggests that less than 1% of the data contain errors that involve gross mis-location of points or mis-correlation of coals. This map did not make use of all available point-source data nor were traces of previously mapped faults and other structural features used to control or modify contours. This map was created to depict broad regional trends in elevation of the coal. More detailed, larger scale maps should be consulted for site-specific information on coal elevation. Polygon topology is present. The point-source data was compiled by ISGS staff for various projects (primarily related to coal resources, structure, and mining geology) dating back to 1938. This subset was compiled for and is available from the USGS's National Coal Resources Data System. 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 one or more coals for a specific data point be interpreted to mean that those coals are not present. 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. This map was compared to the elevation map of the overlying Herrin Coal. The elevation contours of this bed were adjusted to maintain the appropriate elevation below the Herrin Coal. ISGS Coal Section 1996 Coal Stratigraphic Data map ISGS Map same as title Champaign, Illinois Illinois State Geological Survey map 1996 publication date none All attribute information unknown unknown /coal-resources/statemaps/crop5_500 map ISGS Map unknown Champaign, Illinois Illinois State Geological Survey 500000 map unknown unknown none Outcrop line Extraction of point-source data 12,027 Data points that contained an x/y coordinate and an elevation of the Springfield Coal were extracted from the coal stratigraphic data base and formatted for Earthvision. 1996 Extraction of point-source data 5,697 Data points that contained an x/y coordinate and elevation of both the Springfield and Herrin Coals were extracted from the coal stratigraphic data base and formatted for Earthvision. 1996 Contouring of Elevation Elevation of point-source data was contoured using Dynamic Graphic Inc.'s Earthvision software. Grid size was set to 5000 feet. Defaults were used for all other parameters. 1996 Contouring of Interval thickness Thickness of the interval between the Herrin and Springfield Coals was contoured from point-source data using Dynamic Graphics Inc.'s Earthvision software. Grid size was set to 5000 feet. Defaults were used for all other parameters. 1996 Adjustment of Springfield elevation The grid of the thickness of the interval between the Herrin and Springfield Coals was subtracted from the Herrin elevation and the resulting grid compared to the grid of Springfield elevation. A final grid of Springfield elevation was made by taking the lowest elevation at each point of comparison. 1996 Post-contouring Processing 1. The Earthvision grid was exported to an Arc line coverage and clipped using the outcrop of the Springfield Coal from Treworgy and Bargh, 1984. 2. The Springfield outcrop arcs were copied into the coverage. 3. Items for the .PAT and the .AAT files were added to the coverage. The .PAT items were: elev-top-of-bed 8 8 N 2 The .AAT items were: elev-top-of-bed 8 8 N 2 4. The line coverage was converted to a polygon coverage by automatically assigning the average value of bounding lines to each polygon (e.g. if a polygon was bounded by a 400 ft and 500 ft isoline, the polygon was assigned the value of 450 ft). Peak and valley polygons were assigned a value of plus or minus 50 ft of the bounding polygon (e.g. if a peak polygon was surrounded by a 500 ft isoline, the polygon was assigned a value of 550 ft). 5. Polygons less than 350 million square feet in area (about 12 square miles ) were considered to be artifacts of processing unsupported by the grid size used to contour the point-source data. These polygons were eliminated using the Arc eliminate command. 1996 Polygons edited by Chris Korose to match the current crop of the coal. 2002 Metadata imported. withheld 20040324 14412000 North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 Explicit elevation coordinate included with horizontal coordinates not applicable Attribute items are in typical ARC/INFO feature class format. User-defined attributes are: Polygon attributes: ELEV_SPRFD_TOP - Average elevation of the top of the Springfield Coal within the polygon. The contour interval is 100 feet and polygon boundary lines represent these contours (e.g. 100, 200, 300, etc.) Actual polygon values (e.g. 150, 250, etc.) reflect the average coal elevation within the polygon, as based on the bounding contours. none ITEM_LABEL ITEM_LABEL String 20 0 0 ELEV_SPRFD OBJECTID OID 4 10 0 Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. Shape Shape Geometry 8 Feature geometry. ESRI Coordinates defining the features. 0 0 SHAPE ELEV_SPRFD Double 8 Feature geometry. ESRI Coordinates defining the features. 38 8 source_organization Source Organization String 255 0 0 hyperlink Link String 255 0 0 resource_date Date of Resource String 255 0 0 IL_Springfield_Elevation_Py Feature Class 0 st_area(shape) st_area(shape) Double 0 0 0 st_perimeter(shape) st_perimeter(shape) Double 0 0 0 Illinois State Geological Survey Information Office mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 U.S.A. 217-244-2414 217-244-0802 isgs@isgs.uiuc.edu 8:00 a.m. - 5:00 p.m., Monday-Friday 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. Downloadable Data 0.000 0.000 20071217 20020408 Christopher P. Korose Illinois State Geological Survey mailing address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-7256 217-333-2830 korose@geoserv.isgs.uiuc.edu FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 This metadata document is intended for public distribution none en local time 20230202 08062700 FALSE 20230528 13475200 20230528 13475200 IL_Springfield_Elevation_Py 002 Projected GCS_WGS_1984 Linear Unit: Meter (1.000000) <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.1.0'><WKT>PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",3857]]</WKT><XOrigin>-20037700</XOrigin><YOrigin>-30241100</YOrigin><XYScale>10000</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102100</WKID><LatestWKID>3857</LatestWKID></ProjectedCoordinateSystem> WGS_1984_Web_Mercator_Auxiliary_Sphere 1.0 Esri ArcGIS 13.1.0.41833 IL_Springfield_Elevation_Py -90.614948 -87.498703 41.488312 37.598317 1 -90.614948 -87.498703 41.488312 37.598317 1 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 withheld Local Area Network 0.000 Shapefile Enterprise Geodatabase Feature Class Vector Simple FALSE 0 TRUE FALSE GCS_North_American_1983 EPSG 6.18.3(9.3.1.2) 0 20230528