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Coal fields of the Illinois Basin

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How should this data set be cited?

   U.S. Geological Survey Central Region Energy Resources Team, 2002, Coal fields of the Illinois Basin: U.S. Geological Survey Professional Paper 1625-D, U.S. Geological Survey, Denver, Colorado.

   This is part of the following larger work.

   (ed.), J.R. Hatch , and (ed.), R.H. Affolter , 2002, Resource Assessment of the Springfield, Herrin, and Danville and Baker Coals in the Illinois Basin: U.S. Geological Survey Professional Paper 1625-D, U.S. Geological Survey, Denver, Colorado.

   This is part of the following larger work.

   U.S. Geological Survey, 2002, National Coal Resource Assessment: U.S. Geological Survey Professional Paper 1625, U.S. Geological Survey, Denver, Colorado.

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -165.402

   East_Bounding_Coordinate: -71.150

   North_Bounding_Coordinate: 70.824

   South_Bounding_Coordinate: 26.043

3. What does it look like?

   <URL:http://energy.er.usgs.gov/products/openfile/OF96-92/Comp/main.gif> (GIF)

   Simplified GIF image of main map. Other images are also available.

4. Does the data set describe conditions during a particular time period?

   Calendar_Date: 03-May-1996

   Currentness_Reference: publication date

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: map

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

   2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.001. Longitudes are given to the nearest 0.001. Latitude and longitude values are specified in Decimal Degrees.

7. How does the data set describe geographic features?

   USCOAL.PAT

   polygon attribute table for USCOAL coverage (Source: ARC/INFO)

   COALTYPE

   A unique code that corresponds to the type of coal represented by that polygon. (Source: Trumbull, Barnes)

   Value	Definition
   0	an internal polygon where no coal is present;
   20	Anthracite coal;
   25	Anthracite coal of doubtful value;
   30	Sub-Bituminous coal;
   35	Sub-Bituminous coal of doubtful value;
   40	Low-Volitile Bituminous coal;
   45	Low-Volitile Bituminous coal of doubtful value;
   50	Lignite coal;
   55	Lignite coal of doubtful value;
   60	Medium and High volitile Bituminous coal;
   65	Medium and High volitile Bituminous coal of doubtful value;

   DESCRIPTIO

   textual description of COALTYPE (Source: Trumbull, Barnes)

   RED

   8 bit red color component (Source: Trumbull, Barnes)

   Value	Definition
   0 - 255	red color component

   GREEN

   8 bit green color component (Source: Trumbull, Barnes)

   Value	Definition
   0 - 255	green color component

   BLUE

   8 bit blue color component (Source: Trumbull, Barnes)

   Value	Definition
   0 - 255	blue color component

   USCOAL.AAT

   arc attribute table for USCOAL coverage (Source: ARC/INFO)

   DASH

   Code that determines if line is symbolized as a dash or as a solid line. Dashed lines represent areas where the extent of the coal is unknown. (Source: Trumbull, Barnes, Wood)

   Value	Definition
   0	solid line (known extent)
   1	dashed line (unknown extent)

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • U.S. Geological Survey Central Region Energy Resources Team

2. Who also contributed to the data set?

3. To whom should users address questions about the data?
   John Tully
   MS 956 National Center
   Reston, Virginia 20192
   USA
   

   703-648-6432 (voice)
   

Why was the data set created?

This data set was compiled primarily for use in cartographic products. This coverage has also been used in web applications as well as in other miscellaneous graphic proudcts. Overall, the need for a digital version of this data was the underlying reason for generating this data set. Related covers include USCOKECOAL (point coverage of coking coal) and USAKCOALPT (point coverage of Alaska coal).

How was the data set created?

1. From what previous works were the data drawn?

   (source 1 of 14)

   U.S. Geological Survey, 1908, Coal Fields of the United States (Campbell).

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 7500000

   (source 2 of 14)

   U.S.G.S, 1942, Coal Fields of the United States (Averitt).

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 2500000

   (source 3 of 14)

   U.S. Geological Survey, 1960, Fields of the United States, sheet 1,(Trumbull).

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 5000000

   (source 4 of 14)

   U.S. Geological Survey, 1960, Coal Fields of the United States, sheet2,(Barnes).

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 5000000

   (source 5 of 14)

   U.S. Geological Survey, 1988, Coal Map of North America, south sheet,(Wood and Bour).

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 5000000

   (source 6 of 14)

   Survey, Missouri Geological , 1979, Geologic Map of Missouri.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 500000

   (source 7 of 14)

   Mississippi Geological Society and U.S.G.S, 1945, Geologic Map of Mississippi.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 500000

   (source 8 of 14)

   Survey, Louisiana Geological , 1984, Geologic Map of Louisiana.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 500000

   (source 9 of 14)

   Arkansas Geological Commission and U.S. Geological Survey, 1976, Geologic Map of Arkansas.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 500000

   (source 10 of 14)

   Texas Bureau of Economic Geology, 1992, Geologic Map of Texas.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 500000

   (source 11 of 14)

   Georgia Dept. of Natural Resources and Georgia Geological Survey, 1975, Geologic Map of Georgia.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 500000

   (source 12 of 14)

   Kentucky Geological Survey and U.S. Geological Survey, 1981, Geologic Map of Kentucky.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 250000

   (source 13 of 14)

   Tennessee Dept. of Conservation, Division of Geology, 1966, Geologic Map of Tennessee.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 250000

   (source 14 of 14)

   Geological Survey of Alabama, 1989, Geologic Map of Alabama.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 500000

2. How were the data generated, processed, and modified?

   Date: 1995 (process 1 of 1)

   All paper maps were manually digitized on a tablet using ARC/INFO. All data was then appended into one data set. This data set was edited to resolve inconsistenceies between maps and to form a polygon coverage. The final data set was then attributed using the codes described within this document

3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?

2. How accurate are the geographic locations?

3. How accurate are the heights or depths?

4. Where are the gaps in the data? What is missing?

   This data set is a representation of the Coal Fields in the Conterminous United States and Alaska (none in Hawaii). The Trumbull map was the main source of information. The Gulf Coast region was updated using state geologic maps. Team scientists determined that this combination would provide the most up to date information concerning U.S. coal fields

5. How consistent are the relationships among the observations, including topology?

   Topology for this data set was built using the CLEAN command within ARC/INFO. This command eliminates dangling nodes, calculates inter- sections of arcs, eliminates redundant arcs, and creates an polygon attribute table.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints: None

1. Who distributes the data set? (Distributor 1 of 1)
   USGS Information Services
   Box 25286 Denver Federal Center
   Denver, CO 80225
   USA
   

   1-888-ASK-USGS (voice)
   303-202-4693 (FAX)
   ask@usgs.gov
   

2. What's the catalog number I need to order this data set?

   USGS Professional Paper 1625-D

3. What legal disclaimers am I supposed to read?

   This Compact Disc-Read Only Memory (CD-ROM) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
   Although all data and software published on this CD-ROM are used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the U.S. Geological Survey as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	Geographic features and attribute data in format ArcView shapefile (version 1.0)
     Network links:	<http://energy.cr.usgs.gov/coal/nca/>

   • Cost to order the data: none

Who wrote the metadata?

Dates:

Last modified: 03-May-1996
Last Reviewed: 28-Mar-2002

Metadata author:

John Tully compiler
USGS, Eastern Energy Team
MS 956 National Center
Reston, Virginia 20192
USA

703-648-6432 (voice)

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)