The North Carolina Office of State Planning, Geodetic Survey in cooperation with the NC Center for Geographic Information and Analysis, developed the GIS data set, Geodetic Control Points, to identify points in North Carolina depicting horizontal and vertical survey control locations as fixed by the NC Geodetic Survey.
This data was created to assist governmental agencies and others in making resource management decisions through use of a Geographic Information System (GIS).
>system filename: gdc file size = 3.38 mb > >Revisions and updates to this layer include: >7.) filename: gdc0803 Layer updated August, 2003. 29939 points. > >6.) filename: gdc1299 Layer updated December, 1999. Geodetic control >points added and attribute z-value added. 28549 points. Data is in >83, state plane, meters. > >5.) filename: gdc1298 The December 1998 update to this layer consisted >of projecting the data from NAD83 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. > >4.) filename: gdc398 March 19, 1998 - Geodetic control points >added. Number of points is now 28061 and data is in 83, stateplane, >feet. > >3.) filename: gdc594 The May 1994 version has 26353 points and >is in 83, stateplane, feet. (previously called nc.gdc594) > >2.) filename: gdc294 The February 18, 1994 file was in >83, stateplane, feet. This file was reviewed and no changes >were made from the 10/93 version. (previously called nc.gdc294) > >1.) filename: gdc1093 The October 1993 version was the orginal >release. File is in 83, state plane, feet. (previously >called nc.gdc1093)
Data creation and revision dates
Acknowledgement of products derived form this data set should cite the following: The source of the Geodetic Control Points 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.
512 N. Salisbury Street
Preferred contact is by mail or telephone
>Office of State Planning >NC Geodetic Survey Director, Gary Thompson >512 N. Salisbury Street >Raleigh, NC 27604-1148 > >NCCGIA Director, Karen Siderelis >Database Administration, Zsolt Nagy >Database Management, Ken Shaffer >Project Manager, David Giordano >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
Point attributes were supplied by the North Carolina Geodetic Survey.
Using ESRI's ARC/INFO GIS software, the dataset was built for points using the "build" command. Topology has not been edited since the last build or clean.
Points depicting horizontal and vertical survey control locations as fixed by the NC Geodetic Survey. Horizontal control markers based on North American Datum 1983 geodetic network and used as a base for mapping. Vertical control markers based on National Geodetic Vertical Datum 1929 geodetic network.
Points meet either the First-Order positional accuracy (not to exceed 1 part in 100,000) or the Second-Order, Class 1 positional accuracy (not to exceed 1 part in 50,000) for the National network of horizontal control.
Geodetic control points
Geodetic control locations were obtained through tower triangulation surveys, traverse surveys and Global Positioning System (GPS) Surveys.
512 N. Salisbury Street
Phone
The data for all 100 counties was sent to NC CGIA via e-mail. This included the geodetic monument names with x/y coordinates and z values in stateplane meters. The 100 textfiles were joined together, then read into an arc/info INFO file. An ARC/INFO points coverage was generated in arcview using add event theme.
301 North Wilmington Street, Suite 700
Phone and electronic mail preferred
Metadata imported.
Internal feature number.
ESRI
Feature geometry.
ESRI
Polygon internal identification number
Software computed
Polygon internal identification number
Software computed
Name of monument
NC OSPL, Geodetic Survey
X coordinate
NC OSPL, Geodetic Survey
Y coordinate
NC OSPL, Geodetic Survey
Z value
NC OSPL, Geodetic Survey
A point coverage depicting horizontal and vertical survey control locations as fixed by the NC Geodetic Survey. The point attribute table (PAT) has attribute data including total area in coverage units, total perimeter, two internal identification numbers, the name of the monument, and x/y coordinates and z values. >GDC.PAT Point Attribute Table >ITEM NAME WIDTH OUTPUT TYPE N.DEC DESCRIPTION >AREA 4 12 F 3 Total area in meters >PERIMETER 4 12 F 3 Total perimeter in meters >GDC# 4 5 B - Internal identification number >GDC-ID 4 5 B - Internal user identification number >GEOD-NAME 40 40 C - Name of monument >X_COORD 8 10 F 3 X coordinate >Y_COORD 8 10 F 3 Y coordinate >Z_VALUE 7 7 C - Z value
None
301 North Wilmington Street, Suite 700
Phone and electronic mail preferred For current price information use a web browser: COST INFORMATION - http://www.cgia.state.nc.us/cost.html
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.
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.
301 North Wilmington Street, Suite 700
Phone and electronic mail preferred