Generalized depth of the Jamestown Coal

Illinois State Geological Survey 2002 Generalized depth of the Jamestown Coal 1.0 (Prior to 1995 no version numbers had been assigned to this coverage. vector digital data ISGS GIS Database jtown_dp Champaign, Illinois Illinois State Geological Survey GISDB_COAL_IL_Jamestown_Depth_Py withheld This datafile shows a highly generalized depth to the top of the Jamestown Coal in Illinois. These 100-foot contours were created by Earthvision software using data from drill holes. Because the depth of the coal was contoured directly from drill hole data (as opposed to creating a map of coal elevation and subtracting it from a map of surface topography) the resulting map is essentially based on the assumption that the land surface is a level plain. Consequently, the accuracy of the map is lowest where the coal is shallowest. 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 depth of the Jamestown 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 2001 publication date of sources Complete Irregular -88.009571 -87.495214 39.422328 38.568089 -88.009571 -87.495214 38.568089 39.422328 none geology coal coal seams mineral resources structure depth Jamestown 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 2000 by visual inspection of the contours for depth anomolies and comparison with earlier depth maps. Original point-source data associated with anomolies were checked for accuracy of location and correlation. These reviews were performed in an iterative fashion. 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 point-source 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. This map was created to depict broad regional trends in depth of the coal. Contours were created directly from point-source data on coal depth with no consideration given to local or regional topography. This method assumes that the land surface is a level plain. Given that surface elevation in Illinois rarely varies by more than 100 feet (and commonly less than 50 feet) over short distances, this method results in a reasonably accurate regional depiction of coal depth. The greatest inaccuracies are where the coal is less than 200 feet deep. 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. ISGS Coal Section 1996 Coal Stratigraphic Data map ISGS Map same as title Champaign, Illinois Illinois State Geological Survey not applicable paper 1996 publication date none All attribute information Treworgy, J.D. and M.H. Bargh 1984 Coal Resources of Illinois: Jamestown Coal map ISGS Map same as title Champaign, Illinois Illinois State Geological Survey 500000 paper 1984 publication date none Outcrop line Extraction of point-source data (Springfield Coal as an example): Data points that contained an x/y coordinate and a depth of the Springfield Coal were extracted from the coal stratigraphic data base and formatted for Earthvision. 1995 Contouring of depth Depth of coal as reported by 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. 1995 Adjustment of depth The grid of Springfield depth was compared to the grid of Herrin depth and a third grid was created in which the Springfield was at least 20 feet below the Herrin in all areas. 1995 Post-contouring Processing 1. The modified Earthvision grid was exported to an Arc line coverage and clipped using the outcrop of the Springfield Coal. 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: depth_spring 8 8 N 2 The .AAT items were: depth_spring 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). The polygon bounded by the 200 foot contour and the coal crop was assigned a value of 175 feet. 5. Polygons less than 250 million square feet in area 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. 1995 Polygons edited by Chris Korose to match the current crop of the coal. 2002 Metadata imported. withheld 20040324 14360400 Vector Simple FALSE 0 TRUE FALSE 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: DEPTH-JTOWN - Average depth of the top of the Jamestown Coal within the polygon. The contour interval is 100 feet and polygon boundary lines represent these contours (e.g. 300, 400, 500, etc.) Actual polygon values (e.g. 350, 450, etc.) reflect the average coal depth within the polygon, as based on the bounding contours. none ITEM_LABEL ITEM_LABEL String 20 0 0 DEPTH_JTOW 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 DEPTH_JTOW SmallInteger 2 Feature geometry. ESRI Coordinates defining the features. 5 0 source_organization Source Organization String 255 0 0 hyperlink Link String 255 0 0 resource_date Date of Resource String 255 0 0 IL_Jamestown_Depth_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 20020828 Christopher P. Korose Illinois State Geological Survey mailing address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-7256 217-333-2830 korose@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 08062300 FALSE 20230528 13300500 20230528 13300500 IL_Jamestown_Depth_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_Jamestown_Depth_Py -88.009571 -87.495214 39.422328 38.568089 1 -88.009571 -87.495214 39.422328 38.568089 1 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 withheld Local Area Network 0.000 Shapefile Enterprise Geodatabase Feature Class GCS_North_American_1983 EPSG 6.18.3(9.3.1.2) 0 20230528