onemap_prod.SDEADMIN.geol

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently-anticipated questions:

What does this data set describe?

Title: onemap_prod.SDEADMIN.geol
Abstract:
The North Carolina Department of Environment, Health, and Natural Resources, Division of Land Resources, NC Geological Survey, in cooperation with the North Carolina Center for Geographic Information and Analysis, developed the GIS data set version of the Geology of North Carolina. The data represents the digital equivalent of the official State Geology map (1:500,000-scale), but was digitized from (1:250,000-scale) base maps. The geologic formation id is the only attribute present. There are two additional files which accompany this layer, dikes and faults. These should be used together with the Geology formations layer. All three files come together. (Refer to the cross references section for more detail on the dikes and faults).
Supplemental_Information:
This data includes three coverages: geol250, which contains geologic formations; geol250d, which contains dikes; and geol250f, which contains faults.
To purchase a hardcopy of this data layer (the official 1985 NC State Geologic Map, shown at a 1:500,000 scale), contact: NC Geologic Survey PO Box 27687 Raleigh, NC 27611 (919) 733-2423 As of December, 1995, map cost is approximately $10.00. Call to confirm availability and price.
This coverage corresponds to the DOT county boundary file. Other county boundary files may not be compatible with this layer. 
system filename: geol250     file size = 2.1 mb

Revisions and updates to this layer include:
3.) filename: geol2501298  The December 1998 update to this layer
consisted of projecting the data from NAD27 datum, State Plane
projection, units of measure feet TO: NAD83 DATUM, State Plane
PROJECTION, UNITS OF MEASURE METERS.  This was done to comply
with the NC Geographic Information Coordinating Council's
"Statement of Direction for North Carolina Corporate Geographic
Database Horizontal Reference, Datum and Unit of Measure".
This reprojecting was done in various ways depending on the
data type and content.  Vector data was projected using the
'project' command in ESRI's Arc software and topology was
cleaned and built based on coverage needs.  Raster data was
projected using ESRI's Grid module and various steps as applicable.
2.) filename: geol25093 - This represents the 1993 version which
contains the following correction. In the spring of 1993, a geologic
formation (ZYba, Amphibolite) in Macon County was added in order
to correct the digital file. This formation had been omitted in
the original digitization. The file containing the omitted
information has been deleted.  The associated files names are:
geol250d for dikes and geol250f for faults.
1.) filename: geol25086  The 1986 version was the first release.
(previously named nc250.geo).
  1. How should this data set be cited?

    NC DEHNR-Division of Land Resou, NC Geological Survey, 19981201, onemap_prod.SDEADMIN.geol: NC DEHNR-Division of Land Resources, NC Geological Survey, Raleigh, North Carolina.

    Online Links:

    Other_Citation_Details: NCCGIA distributes this dataset

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -84.422474
    East_Bounding_Coordinate: -75.418541
    North_Bounding_Coordinate: 36.617432
    South_Bounding_Coordinate: 33.732442

  3. What does it look like?

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

    Calendar_Date: REQUIRED: The year (and optionally month, or month and day) for which the data set corresponds to the ground.
    Currentness_Reference: Data creation and edit dates

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

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

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

      Indirect_Spatial_Reference: None
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (1832)
      • GT-polygon composed of chains (1833)
      • Node, planar graph (2814)
      • Area point (1833)

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

      Grid_Coordinate_System_Name: State Plane Coordinate System 1983
      State_Plane_Coordinate_System:
      SPCS_Zone_Identifier: 3200
      Lambert_Conformal_Conic:
      Standard_Parallel: 34.333333
      Standard_Parallel: 36.166667
      Longitude_of_Central_Meridian: -79.000000
      Latitude_of_Projection_Origin: 33.750000
      False_Easting: 609601.220000
      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.001232
      Ordinates (y-coordinates) are specified to the nearest 0.001232
      Planar coordinates are specified in meters

      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.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Resolution: 1.000000
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    onemap_prod.SDEADMIN.geol
    Delineations of surface geology (Source: NC DEHNR-Division of Land Resources, Geological Survey)

    SHAPE.len

    PERIMETER
    Total perimeter in coverage units (Source: Software computed)

    Frequency of measurement: None planned

    Range of values
    Minimum:166.947
    Maximum:7,379,875.000
    Units:meters
    Resolution:0.001

    OBJECTID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    GEOL250_

    GEOL250_ID

    GEO_NAME

    SHAPE
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    SHAPE.area

    onemap_prod.SDEADMIN.geol.AREA

    Geologic formations
    Delineations of surface geology (Source: NC DEHNR-Division of Land Resources, Geological Survey)

    FNODE#
    From-node identifier of linear feature (Source: Software computed)

    Frequency of measurement: None planned

    Range of values
    Minimum:1
    Maximum:2,814

    TNODE#
    To-node identifier of linear feature (Source: Software computed)

    Frequency of measurement: None planned

    Range of values
    Minimum:1
    Maximum:2,814

    LPOLY#
    Internal number of poly to left of arc (Source: Software computed)

    Frequency of measurement: None planned

    Range of values
    Minimum:1
    Maximum:1,811

    RPOLY#
    Internal number of poly to right of arc (Source: Software computed)

    Frequency of measurement: None planned

    Range of values
    Minimum:1
    Maximum:1,833

    LENGTH
    Length of arc in coverage units (Source: Software computed)

    Frequency of measurement: As needed

    Range of values
    Minimum:25.481
    Maximum:162,302.688
    Units:meters
    Resolution:10.0

    GEOL250#
    Internal feature number (Source: Software computed)

    Frequency of measurement: As needed

    Range of values
    Minimum:1
    Maximum:3,739

    GEOL250-ID
    Internal ID number (Source: User defined)

    Frequency of measurement: As needed

    Range of values
    Minimum:1
    Maximum:1

    Entity_and_Attribute_Overview:
    A polygon coverage and two arc coverages depicting the official geologic map of North Carolina (1985) as published by the NC Geological Survey and the US Geologic Survey. The information consists of three coverages: geologic formations, dikes, and faults. The polygon attribute table (PAT) has attribute data including total area in coverage units (square meters), total perimeter (linear meters), polygon internal identification number, polygon user identification number, and an abbreviation for the geologic formation. The arc attribute table (AAT) for all three coverages includes computer generated identifiers and the length of the arc. 
    GEOL250.PAT  Polygon Attribute Table (Geologic Formations)
COLUMN  ITEM NAME    WIDTH OUTPUT TYPE  DEC  DESCRIPTION
1   AREA           4     12    F     3   Total area in meters
5   PERIMETER      4     12    F     3   Total perimeter in meters
9   GEOL250#       4      5    B     -   Poly internal id number
13  GEOL250-ID     4      5    B     -   Poly user id number
17  GEO-NAME       6      6    C     -   Abbreviation for geologic formation
GEOL250.AAT  Arc Attribute Table
COLUMN  ITEM NAME    WIDTH OUTPUT TYPE  DEC  DESCRIPTION
1    FNODE#         4      5    B     -   From-node id of linear feature
5    TNODE#         4      5    B     -   To-node id of linear feature
9    LPOLY#         4      5    B     -   Left-side polygon id of linear
feature
13   RPOLY#         4      5    B     -   Right-side polygon id of linear
feature
17   LENGTH         4     12    F     3   Length of linear feature in meters
21   GEOL250#       4      5    B     -   Internal id number
25   GEOL250-ID     4      5    B     -   Internal id number
    Entity_and_Attribute_Detail_Citation:
    Refer to: "Geologic Map of North Carolina, 1985" for a hardcopy version, and detailed descriptions of the Major Litho-Tectonic Features, Geologic Time Scale, and Paleozoic Metamorphic Facies.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Division of Land Resources Director, Charles H. Gardner
NC Geological Survey Chief, Jeff Reid
NC Dept. of Environment, Health, and Natural Resources
512 N. Salisbury Street
Raleigh, NC 27604-1148

NCCGIA Director, Karen Siderelis
Database Administration, Zsolt Nagy
Database Management, Ken Shaffer
North Carolina Center for Geographic Information and Analysis
Governor's Office
Office of State Planning
301 North Wilmington Street, Suite 700
Raleigh, NC 27601-2825

  3. To whom should users address questions about the data?

    Jeff Reid
    NC Geological Survey
    Chief Geologist
    512 N. Salisbury Street
    Raleigh, North Carolina 27604-1148
    U.S.A.

    (919) 733-2423 (voice)

    Hours_of_Service: 8:00am to 5:00pm
    Contact_Instructions: Preferred contact is by mail or telephone.

Why was the data set created?

This data was created to assist governmental agencies and others in making resource management decisions through use of a Geographic Information System (GIS).

How was the data set created?

  1. From what previous works were the data drawn?

    None (source 1 of 2)
    NC DEHNR-Division of Land Resou, NC Geological Survey, 1993, Geology - North Carolina (1;250,000): NC DEHNR-Division of Land Resources, NC Geological Survey, Raleigh, North Carolina.

    Other_Citation_Details: This data set contains 3 files
    Type_of_Source_Media: Mylar
    Source_Scale_Denominator: 250000
    Source_Contribution:
    Data depicting the official geology of North Carolina, on mylar stable bases.

    None (source 2 of 2)
    NC Center for Geographic Information and Analysis, 1993, Geology - North Carolina (1;250,000): NC Center for Geographic Information and Analysis, Raleigh, North Carolina.

    Other_Citation_Details: CGIA distributes the data
    Type_of_Source_Media: Mylar
    Source_Scale_Denominator: 250000
    Source_Contribution:
    Digitization of geologic boundaries and formation ID attribution.

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

    Date: 1986 (process 1 of 4)
    Delineation of the official NC State Geologic formations.

    Person who carried out this activity:

    Jeff Reid
    NC DEHNR-Division of Land Resources, NC Geological Survey
    Chief Geologist
    512 N. Salisbury Street
    Raleigh, North Carolina 27604-1148
    U.S.A.

    (919) 733-2423 (voice)

    Hours_of_Service: 8:00am to 5:00pm
    Contact_Instructions: Phone and electronic mail preferred
    Date: 1993 (process 2 of 4)
    Digital conversion of the geologic formation delineations through the use of Calcomp digitizing tables into ESRI's ARC/INFO software.

    Person who carried out this activity:

    Ken Shaffer
    NC CGIA
    301 North Wilmington Street, Suite 700
    Raleigh, North Carolina 27601-2825
    U.S.A.

    (919) 733-2090 (voice)
    (919)715-0725 (FAX)
    dataq@cgia.state.nc.us

    Hours_of_Service: 8:30AM - 5:30PM
    Contact_Instructions: Phone and electronic mail preferred
    (process 3 of 4)
    Metadata imported.

    Data sources used in this process:

    • C:\DOCUME~1\david\LOCALS~1\Temp\xml799.tmp

    (process 4 of 4)
    Dataset copied.

    Data sources used in this process:

    • Server=207.192.29.55; Service=5151; Database=onemap; User=sdeadmin; Version=sde.DEFAULT

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

    NC DEHNR-Division of Land Resou, NC Geological Survey, 1993, Geology - North Carolina (1:250,000) Dikes: NC DEHNR-Division of Land Resources, NC Geological Survey, Raleigh, North Carolina.

    Online Links:

    Other_Citation_Details: Digitized by NCCGIA
    NC DEHNR-Division of Land Resou, NC Geological Survey, 19950630, Geology - North Carolina (1:250,000) Faults: NC DEHNR-Division of Land Resources, NC Geological Survey, Raleigh, North Carolina.

    Online Links:

    Other_Citation_Details: Digitized by NCCGIA

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

  1. How well have the observations been checked?

    NCCGIA digitized the geology features from mylar stable bases identifying boundary and name attributes of geologic features. A review by check plot overlay was used to determine label discrepancies and found discrepancies were corrected.

  2. How accurate are the geographic locations?

    No official accuracy assessment has be performed on this data set. The digital files were checked to within a linewidth of the original base maps. The base maps were delineated with geologic extents identified by the U.S. Geological Survey and the NC Geologic Survey.

  3. How accurate are the heights or depths?

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

    These data represent the official geologic map of North Carolina. The information consists of three coverages, which depict the state's geologic formations, its faults, and its dikes. Only geology formation names are attributed.

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

    Using ESRI's ARC/INFO GIS software, the dataset was built for arc and polygon topology using the "build" command. The data set was then cleaned with a fuzzy tolerance of 1 foot. Topology has not been edited since the last build or clean.

How can someone get a copy of the data set?

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

Access_Constraints:
None, but all three coverages (Geology North Carolina, Dikes, and Faults) are to be distributed together, and a copy of the 1985 map legend should accompany them.
Use_Constraints:
Acknowledgement of products derived form this data set should cite the following: The source of the Geologic (1:250,000) data is the North Carolina Corporate Geographic Database. Earlier versions of this data set may exist. The user must be sure to use the appropriate data set for the time period of interest. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, CGIA cannot assume liability for any damages or misrepresentation caused by any inaccuracies in the data or as a result of changes to the data caused by system transfers.

  1. Who distributes the data set? (Distributor 1 of 1)

    NC Center for Geographic Information and Analysis
    Production Services
    301 North Wilmington Street, Suite 700
    Raleigh, North Carolina 27601-2825
    USA

    (919) 733-2090 (voice)
    (919) 715-0725 (FAX)
    dataq@cgia.state.nc.us

    Hours_of_Service: 8:30AM - 5:30PM
    Contact_Instructions:
    Phone and electronic mail preferred For current price information use a web browser: COST INFORMATION - <http://www.cgia.state.nc.us/cost.html>
  2. What's the catalog number I need to order this data set?

    Geology - North Carolina (1:250,000)

  3. What legal disclaimers am I supposed to read?

    NCCGIA is charged with the development and maintenance of the State's corporate geographic database and, in cooperation with other mapping organizations, is committed to offering its users accurate, useful, and current information about the state. Although every effort has been made to ensure the accuracy of information, errors and conditions originating from physical sources used to develop the corporate database may be reflected in the data supplied. The client must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions specific to certain data. NCCGIA does not support secondary distribution of this data. The use of trade names or commercial products does not constitute their endorsement by the NCCGIA or North Carolina State Government.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    Data creation and large data analysis jobs contact Database Administration P:(919)733-2090. All data is available through standard ordering procedures on a cost recovery basis.

  6. What hardware or software do I need in order to use the data set?

    All formats supplied are created using ARC/INFO GIS software on Unix workstations. Other formats are available. Format compatibility is the user's responsibility. For more information on formats and media, use a web browser: FORMAT/MEDIA INFORMATION - <http://www.cgia.state.nc.us/cost.html>

Who wrote the metadata?

Dates:
Last modified: 02-Oct-2006
Metadata author:
North Carolina Center for Geographic Information and Analysis
c/o REQUIRED: The person responsible for the metadata information.
Database Management
301 North Wilmington Street, Suite 700
Raleigh, North Carolina 27601-2825
USA

(919) 733-2090 (voice)
(919) 715-0725 (FAX)
dataq@cgia.state.nc.us

Hours_of_Service: 8:30AM - 5:30PM
Contact_Instructions: Phone and electronic mail preferred
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.5 on Wed Aug 27 10:30:13 2008