system filename: gdc file size = 3.2 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)
NC Office of State Planning, NC Geodetic Survey, 20030820, onemap_prod.SDEADMIN.gdc: NC Office of State Planning, NC Geodetic Survey, Raleigh, North Carolina.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.002048
Ordinates (y-coordinates) are specified to the nearest 0.002048
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.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
| Range of values | |
|---|---|
| Minimum: | 0.000 |
| Maximum: | 0.000 |
| Units: | meters |
| Resolution: | 0.001 |
| Range of values | |
|---|---|
| Minimum: | 121862.148 |
| Maximum: | 946743.312 |
| Units: | Meters |
| Resolution: | 0.001 |
Geodetic name varies in combination of numbers and letters (N/A indicates values that were missing from OSPL database)
| Range of values | |
|---|---|
| Minimum: | 7991.229 |
| Maximum: | 327185.613 |
| Units: | Meters |
| Resolution: | 0.001 |
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
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
(919) 733-3836 (voice)
This data was created to assist governmental agencies and others in making resource management decisions through use of a Geographic Information System (GIS).
NC Office of State Planning, NC Geodetic Survey, 20030820, Geodetic Control Points: NC Office of State Planning, NC Geodetic Survey, Raleigh, North Carolina.
Person who carried out this activity:
(919) 733-3836 (voice)
Person who carried out this activity:
(919) 733-2090 (voice)
(919)715-0725 (FAX)
dataq@cgia.state.nc.us
Data sources used in this process:
Data sources used in this process:
Point attributes were supplied by the North Carolina Geodetic Survey.
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.
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.
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.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- The NC Geodetic Survey is notified monthly by CGIA of the person/groups requesting this data.
- Use_Constraints:
- 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.
(919) 733-2090 (voice)
(919) 715-0725 (FAX)
dataq@cgia.state.nc.us
Geodetic Control Points
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.
FOR DIGITAL OR NON-DIGITAL DATA, Contact NC CGIA, Data Distribution to order data, Phone 919.733.2090 ... Email dataq@cgia.state.nc.us ... Web Page order form <http://www.cgia.state.nc.us/cgdb/index.html>
For current FORMAT/MEDIA INFORMATION, use a web browser: <http://www.cgia.state.nc.us/cost.html> or phone NC CGIA Data Distribution 919.733.2090
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.
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>
(919) 733-2090 (voice)
(919) 715-0725 (FAX)
dataq@cgia.state.nc.us