The Office of State Planning, NC Center for Geographic Information and Analysis, with the aid of The Research Triangle Institute, created the GIS data set, Shoreline 1:24,000-scale, to be used as a template for the Closed Shellfish Harvesting Areas data layer. This layer depicts the coastal North Carolina shoreline, is a subset of the USGS linework from the 1:24,000-scale quadrangles, but is not a complete replication of the shoreline on those quadrangles.
This data was created to assist governmental agencies and others in making resource management decisions through use of a Geographic Information System (GIS), and to assist in the mapping of the Closed Shellfish Havesting Areas.
This data layer was originally digitized at NC CGIA and placed into their 1:24,000-scale tile library. NC CGIA had the Research Triangle Institute (RTI) combine all shoreline tics to create one coverage. This coverage was sent back to NC CGIA, where edits were made to correct for dangles and edgematch problems. The final coverage was then used as a template for the Closed Shellfish Harvesting Areas data layer. >system filename: slcsha24 approx. file size = 9.5 mb > >Revisions and updates to this layer include: >3.) filename: slcsha241298 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: slcsha24994 (previously named nc24.csha91694 and >cgia24.sl994) The September 16, 1994 update consisted >of the addition of shoreline to match the Closed Shellfish >Harvesting Areas data layer. >1.) filename: slcsha194 (previously named nc24.csha194 and >cgia24.sl194) The January 1, 1994 version was the original >version of this data. This file was previously name cgia24.sl.
Data creation and revision dates
Acknowledgement of products derived form this data set should cite the following: The source of the Shoreline 1:24,000-scale 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. NOTE: This layer is a subset of the shoreline found in the USGS 1:24,000- scale quads and does not represent exact replication of the quadrangle linework.
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>NC-CGIA Director, Karen Siderelis >Data Management, Zsolt Nagy >Data Distribution, 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 > >Research Triangle Institute Staff, Ross Curry >Center for Environmental Measurements & Quality Assurance
All attributes are default attributes computed by the GIS software.
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 using the 'clean' command. Topology has not been edited since the last build or clean.
This data layer consists of arc and polygon data depicting coastal North Carolina shoreline as digitized by NC CGIA for use with the Closed Shellfish Harvesting Areas data. While the data was digitized from the USGS 1:24,000-scale quadrangles, it is not a complete duplication of the shoreline depicted on those quadrangles.
The shoreline was digitized from 7.5 Minute USGS paper topographic maps which meet National Map Accuracy Standards. The shoreline was digitized and check plots used to ensure correct line location, within a line width.
Digitization of shoreline
Paper maps used to delineate the shoreline
The Research Triangle Institute combined all shoreline tics to create one coverage. The compiled coverage was returned to CGIA.
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NC CGIA digitized the shoreline from USGS 7.5 Minute series quadrangles. Checkplots were made and overlayed to the originals; linework and label corrections were made. Linework was checked for accuracy to within a pen-width of the original linework. The Research Triangle Institute then combined all shoreline tics to create one coverage and returned the file to CGIA for where edits were made to correct for dangles and edgematch problems. The attributes include only the "sacred items."
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Internal feature number.
ESRI
Internal feature number.
ESRI
Total perimeter in coverage units
Software computed
Feature geometry.
ESRI
Feature geometry.
ESRI
From-node identifier of linear feature
Software computed
To-node identifier of linear feature
Software computed
Internal number of poly to left of arc
Software computed
Internal number of poly to right of arc
Software computed
Length of arc in coverage units
Software computed
Internal feature number
Software computed
Internal Identification Number
User defined
An arc and polygon coverage depicting coastal North Carolina shoreline as digitized from USGS 7.5 Minute series maps to be used as the template for the Closed Shellfish Harvesting Areas data layer. The polygon attribute table (PAT) has attribute data including total area in coverage units (square meters), total perimeter (linear meters), a polygon internal identification number, and a polygon user identification number. The items in the AAT also are all computer calculated. They include FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, slcsha24#, and slcsha24-ID. >SLCSHA24.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 slcsha24# 4 5 B - Poly internal id number >13 slcsha24-ID 4 5 B - Poly user id number >SLCSHA24.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 slcsha24# 4 5 B - Internal id number >25 slcsha24-ID 4 5 B - Internal id number
None
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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