1:100,000-scale County Boundaries

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Frequently-anticipated questions:

What does this data set describe?

Title: 1:100,000-scale County Boundaries
Abstract:
The NC Center for Geographic Information and Analysis developed the GIS data set, County Boundaries, as mapped by the US Geological Survey-Digital Line Graph Program to facilitate planning, siting and impact analysis in the 100 individual counties of North Carolina. This file enables the user to make various county-level determinations when used in conjunction with other data layers. This coverage does not include the shoreline but contains straight-lined boundaries of all of North Carolina's Counties. Another coverage exists which does include the shoreline.
Supplemental_Information: 
system filename: cb100  approx. filesize = 1.41 mb

Revisions and updates to this layer include:
4.) filename: cb100_0306  The March 2006 update to this layer
consisted of correcting the boundaries for Mecklenburg and Iredell
counties according to Law 2001-429, Senate Bill 35.
3.) filename: cb100_1203  The December 2003 update to this layer
consisted of correcting the boundaries for Carteret and Jones
counties according to DOT county boundary updates.
2.) filename: cb100_1298  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.
1.) filename: cb100_90  This 1990 version was the first recorded release
of this county boundary data. (This file was previously named nc100.cb)
A DOT-based county boundaries coverage at approximately 1:126,720 also exists in the Corporate Database. This DOT coverage should be used in conjunction with other data layers that were developed (i.e., clipped) using this coverage. Some of these coverages are: General Geology (1:250,000-scale) General Soils (1:250,000-scale) 1980 Census Boundaries/Population Federal Land Ownership
  1. How should this data set be cited?

    NC Center for Geographic Information & Analysis, 20060330, 1:100,000-scale County Boundaries: NC Center for Geographic Information & Analysis, Raleigh,North Carolina.

    Online Links:

    Other_Citation_Details: NCCGIA distributes this dataset

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -84.421925
    East_Bounding_Coordinate: -75.416567
    North_Bounding_Coordinate: 36.617518
    South_Bounding_Coordinate: 33.723370

  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 date

  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: _Method: County name
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (100)
      • GT-polygon composed of chains (101)
      • Node, planar graph (266)
      • Area point (100)

    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 0.001877
      Ordinates (y-coordinates) are specified to the nearest 0.001877
      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.cb100_poly
    Boundary extents of counties (Source: NC CGIA)

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

    Frequency of measurement: None planned

    Range of values
    Minimum:115,044.969
    Maximum:2,157,495.000
    Units:meters
    Resolution:0.001

    SHAPE.len

    ACRES
    Total acres per county (Source: Software computed)

    Frequency of measurement: None planned

    Range of values
    Minimum:140,534.20
    Maximum:882,002.30
    Units:Acres
    Resolution:0.01

    OBJECTID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    CB100_

    CB100_ID

    CO_

    CO_NAME

    CO_ABBR

    SHAPE
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    SHAPE.area

    onemap_prod.SDEADMIN.cb100_poly.AREA

    County boundaries
    Boundary extents of counties (Source: NC CGIA)

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

    Frequency of measurement: None planned

    Range of values
    Minimum:1
    Maximum:250

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

    Frequency of measurement: None planned

    Range of values
    Minimum:1
    Maximum:251

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

    Frequency of measurement: None planned

    Range of values
    Minimum:1
    Maximum:101

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

    Frequency of measurement: None planned

    Range of values
    Minimum:1
    Maximum:101

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

    Frequency of measurement: None planned

    Range of values
    Minimum:33.783
    Maximum:94,204.594
    Units:meters
    Resolution:.001

    CB100#
    Internal feature number (Source: Software computed)

    Frequency of measurement: None planned

    Range of values
    Minimum:1
    Maximum:350

    CB100-ID
    Internal feature number (Source: User defined)

    Frequency of measurement: None planned

    Range of values
    Minimum:1
    Maximum:350

    ATYPE
    Arc type (Source: NC CGIA)

    Frequency of measurement: None planned

    ValueDefinition
    101NC - VA State boundary
    102NC - SC State boundary
    103NC - GA State boundary
    104NC - TN State boundary
    105NC Coincident state boundary and ocean
    108NC County Boundary
    110NC sound centerline
    112CGIA data

    ANAME
    Arc name (Source: NC CGIA)

    Frequency of measurement: None planned

    ValueDefinition
    NC-VA BNDNC - VA State boundary
    NC-SC BNDNC - SC State boundary
    NC-GA BNDNC - GA State boundary
    NC-TN BNDNC - TN State boundary
    COINC ST/OCEANNC Coincident state boundary and ocean
    NC CBNC County Boundary
    SOUND CENTERLINENC sound centerline
    CGIA DATACGIA data

    Entity_and_Attribute_Overview:
    An arc and polygon coverage depicting the North Carolina state and county boundaries without shoreline. 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, a FIPS numeric code indicating county identification, county name, county abbreviation, and total number of acres per county. The arc attribute table (AAT) includes unique numeric ids as well as arc type and arc name. 
    CB100.PAT  Polygon Attribute Table
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  CB100#     4      5    B     -   Poly internal id number
13  CB100-ID   4      5    B     -   Poly user id number
17  CO#        4      7    C     -   Federal Information Processing
                                     Standard code for county
21  CO-NAME   15     15    C     -   County name
36  CO-ABBR    4      4    C     -   County name abbreviation
40  ACRES      4     12    F     2   Total acres per county
CB100.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   CB100#   4     5     B     -   Internal id number
25   CB100-ID 4     5     B     -   Internal id number
29   ATYPE    4     5     B     -   Arc type
33   ANAME   15    15     C     -   Arc name
    Entity_and_Attribute_Detail_Citation: None

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?

    NCCGIA Director (Acting), Tim Johnson
Database Administration, Zsolt Nagy
Database Management (Acting), David Giordano
North Carolina Center for Geographic Information and Analysis
301 N. Wilmington Street
Suite 700
Raleigh, NC 27601-2825

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

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

    (919) 733-2090 (voice)
    (919)715-0725 (FAX)
    dataq@ncmail.net

    Hours_of_Service: 8am to 5pm
    Contact_Instructions: Phone and electronic mail preferred

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 1)
    Survey, US Geological , 1984-1986, 30 x 60 Series quadrangles: US Geological Survey, Reston, Virginia.

    Other_Citation_Details: Published map series
    Type_of_Source_Media: Mylar
    Source_Scale_Denominator: 100000
    Source_Contribution: Mylar maps from which county boundaries were digitized.

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

    Date: 1986 (process 1 of 6)
    County boundaries were delineated by USGS cartographers on mylar basemaps.

    Person who carried out this activity:

    NCCGIA
    GIS Analyst
    301 N. Wilmington Street, Suite 700
    Raleigh, North Carolina 27601-2825
    U.S.A.

    (919) 733-2090 (voice)
    (919)715-0725 (FAX)
    dataq@ncmail.net

    Hours_of_Service: 8:30AM - 5:30PM
    Contact_Instructions: Phone and electronic mail preferred
    Date: 1990 (process 2 of 6)
    The file was created using ESRI's ARC/INFO version 5.0 GIS using a Calcomp digitizer and ARCEDIT. County boundaries without shoreline were digitized from hand delineated county boundaries on USGS 30 x 60 Series mylar basemaps. The digital files were attributed and checkplots were created for review by NC CGIA GIS analyst. Necessary corrections were made and new plots were run. Post processing involved edgematching and mapjoining of USGS 30 x 60 Series maps used to create the digitized data. This process generated one statewide polygon coverage showing the extent of county boundaries for NC.

    Person who carried out this activity:

    NCCGIA
    GIS Analyst
    301 N. Wilmington Street, Suite 700
    Raleigh, North Carolina 27601-2825
    U.S.A.

    (919) 733-2090 (voice)
    (919)715-0725 (FAX)
    dataq@ncmail.net

    Hours_of_Service: 8:30AM - 5:30PM
    Contact_Instructions: Phone and electronic mail preferred
    Date: Dec-2003 (process 3 of 6)
    Carteret/Jones county boundary corrections were made by extrapolating the county line from GIS parcel data acquired from Carteret County Land Records office.

    Person who carried out this activity:

    Barry Blackburn
    Cartert County Land Records
    GIS Director
    County Administration Building
    Beaufort, North Carolina 28516
    U.S.A.

    252-728-8490 (voice)
    252-222-6124 (FAX)
    barryb@carteretcountygov.org

    Hours_of_Service: 7:30 am to 4:30 pm
    Contact_Instructions: Phone or electronic mail
    Date: 30-Mar-2006 (process 4 of 6)
    Mecklenburg/Iredell county boundary corrections were made by extrapolating the county line from GIS parcel data acquired from Mecklenburg County GIS office.

    Person who carried out this activity:

    Mike Kemp
    Mecklenburg County GIS
    600 E. 4th Street
    Charlotte, North Carolina 28202
    U.S.A.

    704-336-8199 (voice)
    704-336-7333 (FAX)
    kempmk@co.mecklenburg.nc.us

    Hours_of_Service: 7:30 am to 4:30 pm
    Contact_Instructions: Phone or electronic mail
    (process 5 of 6)
    Metadata imported.

    Data sources used in this process:

    • C:\DOCUME~1\david\LOCALS~1\Temp\xml29A.tmp

    (process 6 of 6)
    Dataset copied.

    Data sources used in this process:

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

  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?

    NC CGIA digitized the county boundaries from USGS Digital Line Graphs on mylar basemaps. The polygons were attributed with county name, county FIPS number, county abbreviation, and total acres per county. Arcs were assigned an arc type and name. The digital files were plotted and overlayed to the originals and linework and label corrections were made.

  2. How accurate are the geographic locations?

    County boundaries were digitized from 30 x 60 Series USGS mylar basemaps, which meet National Map Accuracy Standards. The digital files were plotted and overlayed to the originals and needed line corrections were made to within one linewidth.

  3. How accurate are the heights or depths?

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

    This data layer represents the jurisdictional boundaries of all counties in North Carolina, as mapped by the US Geological Survey-Digital Line Graph Program, 1:100,000-scale. The shoreline is not delineated in this file, only the shell of the state.

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

    Using ESRI's ARC/INFO GIS software, the data set 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
Use_Constraints:
Acknowledgement of products derived form this data set should cite the following: The source of the Boundaries - County (1:100,000) 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 N. Wilmington Street, Suite 700
    Raleigh, North Carolina 27601-2825
    USA

    (919) 733-2090 (voice)
    (919) 715-0725 (FAX)
    dataq@ncmail.net

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

    Boundaries - County (1:100,000)

  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 current FORMAT/MEDIA INFORMATION, use a web browser: <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 N. Wilmington Street, Suite 700
Raleigh, North Carolina 27601-2825
USA

(919) 733-2090 (voice)
(919) 715-0725 (FAX)
dataq@ncmail.net

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 18 08:30:08 2010