The National Hurricane Center, in cooperation with the North Carolina Center for Geographic Information and Analysis, developed the GIS data set, Hurricane Storm Surge Inundation Areas (1993), to reevaluate the extent of the areas affected by hurricane inundation along the North Carolina coast. The data depicts the extent of hurricane storm surge inundation areas based on SLOSH (Sea, Lake, and Overland Surges from Hurricanes) models, for the North Carolina coast. This is the metadata for the FAST model (those with forward velocities greater than 15mph). Storm surge is the abnormal rise in water level caused by wind and pressure forces of a hurricane or tropical storm. The SLOSH model was developed using various combinations of hurricane strength (based on the Saffir-Simpson scale), wind speed, and direction of movement. Rainfall produced by a hurricane is not taken into account. This data is stored in a county library by county extent.
This data was created to assist governmental agencies and others in making resource management decisions through use of a Geographic Information System (GIS).
There are several county-based coverages associated with this data layer. The county names below show inundation limit file sizes for the 'fast' hurricanes (those with forward velocities greater than 15mph). There are coverages depicting inundation limits for the 'slow' hurricanes (with forward velocities of less than or equal to 15mph) as well. system filesizes: 1.190 MB Beaufort > .688 MB Bertie > 1.869 MB Brunswick > .364 MB Camden > 1.602 MB Carteret > .689 MB Chowan > 1.330 MB Craven > .625 MB Currituck > .883 MB Dare > .435 MB Gates > .527 MB Hertford > .378 MB Hyde > .417 MB Jones > 1.280 MB New Hanover > 7.541 MB Onslow > .469 MB Pamlico > .442 MB Pasquotank > .583 MB Pender > 1.239 MB Perquimans > .236 MB Tyrrell > .364 MB Washington > >Revisions and updates to this layer include: >6.) filenames: (countyabbrev)hss93s999, one metadata file. >Sept. 3, 1999: Updated one polygon coding error for surge value >in Dare County. >5.) directory: hss93_799 filenames: (countyabbrev)hss93s799 >(countyabbrev)hss93f799 >July 21, 1999 update includes surge updates for the following counties: >Carteret and Onslow. Detailed description of changes: Carteret >hss93s-id = 7 had surge update: '0' to '12'. Onslow >hss93s-id = 194 had surge update: '0' to '3' and hss93s-id = 110 had >surge update: '0' to '12'. >4.) directory: (coabbrev)hss93_399 filenames: (coabbrev)hss93s399 ><countyabbrev>hss93f399, two compliant metadata files. >March 3, 1999 update includes addition of storm surge data for the >following counties: Beaufort, Bertie, Camden, Carteret, Chowan, Craven, >Currituck, Dare, Gates, Hertford, Hyde, Jones, Pamlico, Pasquotank, >Perquimans, Tyrrell, and Washington. >3.) directory: hss93_1298 filename: hss93f1298 and hss93s1298. >There are 2 compliant metadata files. 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.) directory: hss93_295 filenames: hss93f295 and hss93s295 >Represent the February 9, 1995 versions with 2 compliant metadata >files. The update consisted of the deletion of duplicate label >points in both coverages. >These files were previously archived under the following names >but did not have compliant metadata. filename: hss93f.295 hss93s.295 >1.) directory: hss93_994 filenames: nchss93f994 nchss93s994 >September, 1994 was the original release date for these coverages. >Non-compliant metadata is in the info directory.
Digital data creation and revision dates
Acknowledgement of products derived form this data set should cite the following: The source of the Hurricane Storm Surge Inundation Areas (1993) 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.
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>National Hurricane Center Director, Bob Sheets >National Hurricane Staff, Brian Jarvinen >Coral Gables, Florida > >NCCGIA Director >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
All attributes were supplied by the National Hurricane Center Overlays labeled with attribute information were digitized and the attributes transferred to the digital file. Check plots were made and overlayed to the originals to check attribute accuracy.
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.
These data show the extent of hurricane storm surge inundation areas based on SLOSH (Sea, Lake, and Overland Surges from Hurricanes) for the North Carolina coast based on a National Hurricane Center 1993 study. There are two coverages associated with the data layer: one showing limits for the 'fast' hurricanes and one showing limits for the 'slow' hurricanes. The areas are labeled according to hurricane strength (on the Saffir-Simpson scale) measured by movement at miles per hour.
Hurricane storm surge inundation areas were marked onto a third overlay, with 7.5 Minute USGS paper topographic maps (which meet National Map Accuracy Standards) and SLOSH plots underneath. Boundaries drawn on the third overlay were digitized and check plots used to ensure correct boundary location, within a line width.
SLOSH models in map form
Paper maps used to delineate the storm surge areas
The National Hurricane Center ran fast and slow SLOSH models for the coast of North Carolina. These models, in the form of map bases were transferred to CGIA for digital creation of storm surge limits.
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SLOSH models, provided by the National Hurricane Center, and USGS topographic maps (with contour lines), were overlayed and inundation interpolation was done onto a third overlay. The third overlay contained the limits of inundation according to categories 1 and 2, category 3, and categories 4 and 5 hurricanes. Each limit, which was differentiated by color, was then digitized. Check plots were made and overlayed to the originals for accuracy to a pen width of the original linework. Any necessary corrections were made. The coverages were then appended.
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Metadata imported.
Internal feature number.
ESRI
Feature geometry.
ESRI
Polygon internal identification number
Software computed
Polygon internal identification number
Software computed
Hurricane surge inundation limit number
National Hurricane Center
Land not inundated
National Hurricane Center
Land inundated by category 1 or 2 hurricanes, or greater
National Hurricane Center
Land inundated by category 3 hurricane, or greater
National Hurricane Center
Land inundated by category 4 or 5 hurricanes
National Hurricane Center
A polygon coverage depicting the extent of hurricane storm surge inundation areas based on SLOSH (Sea, Lake, and Overland Surges from Hurricanes) for southeastern North Carolina, National Hurricane Center study, 1993. 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, and a number representing the extent of inundation according to the category of the hurricane. >HSS93F.PAT Polygon Attribute Table >ITEM NAME WIDTH OUTPUT TYPE DEC DESCRIPTION >AREA 4 12 F 3 Total area in meters >PERIMETER 4 12 F 3 Total perimeter in meters >HSS93F# 4 5 B - Poly internal id number >HSS93F-ID 4 5 B - Poly user id number >SURGE 4 5 B - Hurricane surge inundation limit 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.
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