system filename: geol250f file size = 0.2 mb Revisions and updates to this layer include: 3.) filename: geol250f1298 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.)geol250f93 - 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 of the formation layer. 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 geol250 for formations. 1.) filename: geol250f86 The 1986 version was the first release. (previously named nc250.geoflt).
NC DEHNR-Division of Land Resou, NC Geological Survey, 19981201, onemap_prod.SDEADMIN.geolfaults: NC DEHNR-Division of Land Resources, NC Geological Survey, Raleigh, North Carolina.Online Links:
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.001024
Ordinates (y-coordinates) are specified to the nearest 0.001024
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.
GEOL250F.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 GEOL250F# 4 5 B - Internal id number 25 GEOL250F-ID 4 5 B - Internal id number
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
(919) 733-2423 (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 DEHNR-Division of Land Resou, NC Geological Survey, 1993, Geology - North Carolina (1;250,000) Faults: NC DEHNR-Division of Land Resources, NC Geological Survey, Raleigh, North Carolina.
NC Center for Geographic Information and Analysis, 1993, Geology - North Carolina (1;250,000) Faults: NC Center for Geographic Information and Analysis, Raleigh, North Carolina.
Person who carried out this activity:
(919) 733-2423 (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:
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.Online Links:
- CGDB layer listing and Metadata - <http://www.cgia.state.nc.us/cgdb/index.html>
NC DEHNR-Division of Land Resou, NC Geological Survey, 19950630, Geology - North Carolina (1:250,000): NC DEHNR-Division of Land Resources, NC Geological Survey, Raleigh, North Carolina.Online Links:
- CGDB layer listing and Metadata - <http://www.cgia.state.nc.us/cgdb/index.html>
NCCGIA digitized the geology features and faults 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.
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.
These data represent faults found on 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.
Using ESRI's ARC/INFO GIS software, the dataset was built for arc 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.
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) Faults 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
Geology - North Carolina (1:250,000) Faults
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