Northern Wrightsville Beach, North Carolina: 1996 to 1997 Elevation Change Map

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: NOAA Coastal Services Center
Publication_Date: 19990801
Title: Northern Wrightsville Beach, North Carolina: 1996 to 1997 Elevation Change Map
Edition: one
Geospatial_Data_Presentation_Form: Map
Publication_Information:
Publication_Place: Charleston, SC
Publisher: NOAA Coastal Services Center
Other_Citation_Details:
The goal of the Coastal Remote Sensing (CRS) program at the NOAA Coastal Services Center is to provide the coastal management community with usable, useful remotely-sensed products. Toward this end, CRS collects and processes a variety of satellite and aircraft remote sensing data, develops software tools and algorithms to use and analyze these data, and makes data products available to the coastal management community through a variety of media, including the Internet, CD-ROMs, and data reports.
Online_Linkage: <http://www.csc.noaa.gov>
Larger_Work_Citation:
Citation_Information:
Originator: NOAA Coastal Services Center
Publication_Date: 19990801
Title: New Hanover County Community Vulnerability Assessment Tool
Publication_Information:
Publication_Place: Charleston, SC
Publisher: NOAA Coastal Services Center
Online_Linkage: <http://www.csc.noaa.gov>
Description:
Abstract:
Elevation maps (Color-Coded Grids) of New Hanover County beaches were produced from remotely-sensed, geographically-referenced elevation measurements as part of the NOAA Coastal Services Center's BeachMap Project. Point data in ascii text files were interpolated in a GIS to create a grid or digital elevation model (DEM) of each beach surface. Contours were then derived from the grids. Contour interval is two feet. Elevation measurements were collected in North Carolina in 1996, 1997 and 1998 using the Airborne Topographic Mapper (ATM), a pulsed laser ranging system mounted onboard an aircraft to measure ground elevation and coastal topography. The system uses high frequency laser beams directed at the earth's surface through an opening in the bottom of the aircraft's fuselage. The laser system records the time difference between emission of the laser beam and the reception of the reflected laser signal in the aircraft. The plane travels over the beach at approximately 60 meters per second while surveying from the low-water line to the landward base of the sand dunes. The ATM, developed by the National Aeronautics and Space Administration (NASA) located at Wallops Flight Facility in Virginia, measures ground elevation with a vertical resolution of 15 centimeters. A sampling rate of 3 kHz or higher results in an extremely dense spatial elevation data set. For example, within a 10 square meter ground area, the number of laser pulses can vary from 11 to 35, depending on scan orientation. Over 100 kilometers of coastline can be easily surveyed within a 3- to 4-hour mission time period. The ability to sample large areas rapidly and accurately is especially useful in morphologically dynamic areas such as barrier beaches. Quick assessment of topographic change can be made following storms by comparing measurements against baseline data. When subsequent elevation maps for an area are analyzed, they provide a useful tool to make management decisions regarding coastal development. Elevation change from survey to survey can be detected by subtracting DEMs to produce difference grids. Difference grids can indicate areas of sand gain or loss.
Purpose:
To produce highly detailed and accurate elevation maps of New Hanover County, NC beaches for use as a management tool.
Supplemental_Information:
The New Hanover County Community Vulnerability Assessment Tool is an informational aid designed to assist communities in their efforts to reduce hazard vulnerability. Before communities can develop effective hazard mitigation strategies, they must first identify their hazard risks and assess their vulnerability to the impacts of those hazards. This CD-ROM product includes a newly developed methodology for conducting a community-wide vulnerability assessment. The general methodology is included as a tutorial that steps the user through a process of analyzing physical, social, economic and environmental vulnerability at the community level.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19961013
Ending_Date: 19970905
Currentness_Reference: 19970905
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.7753
East_Bounding_Coordinate: -77.7730
North_Bounding_Coordinate: 34.2368
South_Bounding_Coordinate: 34.2345
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Elevation map
Theme_Keyword: DEM
Theme_Keyword: Digital Elevation Model
Theme_Keyword: topographic map
Theme_Keyword: coastal geomorphology
Theme_Keyword: digital elevation model
Theme_Keyword: beach erosion
Theme_Keyword: elevation change
Theme_Keyword: Airborne Topographic Mapper
Theme_Keyword: LIDAR
Theme_Keyword: change analysis
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: New Hanover County
Place_Keyword: North Carolina
Place_Keyword: U.S. East Coast
Place_Keyword: Wrightsville Beach
Place_Keyword: Beach
Access_Constraints: none
Use_Constraints: unknown
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NOAA Coastal Services Center
Contact_Person: Coastal Remote Sensing Program
Contact_Position: Beach Map Project Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: SC
Postal_Code: 29505
Country: USA
Contact_Voice_Telephone: 843-740-1200
Contact_Facsimile_Telephone: 843-740-1315
Contact_Electronic_Mail_Address: csc.clearinghouse@noaa.gov
Hours_of_Service: Monday - Friday, 8:00am - 5:00pm EST
Native_Data_Set_Environment:
ESRI Grid format c:\ncmeta\lidar\dif96_97

 

 
 
 

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Raw elevation measurements have been determined to be vertically accurate to within 15 cm. Processing steps (grid interpolation and contour generation) introduce an additional error factor which has not been tested at the time of this publication.
Logical_Consistency_Report:
Grid cells are consistent with features on digital orthophotographs that meet National Map Accuracy Standards at a scale of 1:1200.
Completeness_Report:
All elevation measurements within the bounding coordinates of this grid were used to derive this data set.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Raw elevation measurements have been determined to be within 1.5 meter horizontal accuracy. Processing steps (grid interpolation and contour generation) may introduce additional error which has not been tested at the time of this publication.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Grid cells are vertically consistent with the point elevation data.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: NOAA, USGS, NASA
Publication_Date: 19990801
Title:
LIDAR Beach Map Project/ The ALACE (Airborne LIDAR Assessment of Coastal Erosion) Project
Edition: one
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Charleston, SC
Publisher: NOAA Coastal Services Center
Other_Citation_Details:
The ALACE (Airborne LIDAR Assessment of Coastal Erosion) Project is the research arm of the project. Here protocols for collecting and processing the beach survey data will be developed, and scientific research using this data will be undertaken. The BeachMap Project is the public outreach and data product distribution arm of laser beach mapping.
Online_Linkage: <http://www.csc.noaa.gov/text/beach.html>
Source_Scale_Denominator: n/a
Type_of_Source_Media: x,y,z point file
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19961013
Ending_Date: 19970905
Source_Currentness_Reference: the source data is as current as the date it was flown
Source_Citation_Abbreviation: chng9697
Source_Contribution: The source data were point data from which grids were derived.
Process_Step:
Process_Description:
1) Raw elevation measurements collected by the NASA WFF Airborne Topographic Mapper were converted to North Carolina State Plane x,y coordinates. Elevation values were converted to feet. Files were saved as ascii comma-delimited text files.
2) Elevation text files were imported to ESRI's ArcView software and converted to shapefiles. In ARC/INFO, shapefiles were converted to point coverages using the command SHAPEARC.
3) ESRI's GRID module was used to interpolate the beach surface. The window was set to the point coverage. The following GRID command was used: new_grid = idw(point_cov,elevation,#,1,sample,6,50,5,#) This method employed inverse distance weighted interpolation using 6 nearest neighbors and a cell size of 5 feet. The search radius was limited to 50 feet.
4) The resulting grid(s) were brought into ArcView where they were subtracted from eachother. A change classification legend was then added to the data set.
Process_Date: 199809
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Organization: NOAA Coastal Services Center
Contact_Person: Coastal Hazards GIS Analyst
Contact_Position: Coastal Hazards GIS Analyst
Contact_Address:
Address_Type: mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: SC
Postal_Code: 29505
Country: USA
Contact_Voice_Telephone: 843-740-1200
Contact_Facsimile_Telephone: 843-740-1315
Contact_Electronic_Mail_Address: csc.clearinghouse@noaa.gov
Hours_of_Service: Monday - Friday, 8:00am - 5:00pm EST

 

 
 
 

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 164
Column_Count: 137

 

 
 
 

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: North Carolina
Lambert_Conformal_Conic:
Standard_Parallel: 34.333333
Standard_Parallel: 36.166667
Longitude_of_Central_Meridian: -79.000000
Latitude_of_Projection_Origin: 33.750000
False_Easting: 2000000.002413
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Row and column
Coordinate_Representation:
Abscissa_Resolution: unknown
Ordinate_Resolution: unknown
Planar_Distance_Units: Feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS 80
Semi-major_Axis: 20925604.4720406
Denominator_of_Flattening_Ratio: 298.26

 

 
 
 

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
This Digital Elevation Model is an ARC/INFO grid derived from point data. It is raster data consisting of cells. Each cell has an elevation value associated with it. Cell size is 5 feet by 5 feet.
Entity_and_Attribute_Detail_Citation:
none

 
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NOAA Coastal Services Center
Contact_Person: Clearinghouse Manager
Contact_Position: Clearinghouse Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: SC
Postal_Code: 29505
Country: USA
Contact_Voice_Telephone: 843-740-1200
Contact_Facsimile_Telephone: 843-740-1315
Contact_Electronic_Mail_Address: csc.clearinghouse@noaa.gov
Hours_of_Service: Monday - Friday, 8:00am - 5:00pm EST
Resource_Description: New Hanover County Community Vulnerability Analysis
Distribution_Liability:
Users must assume responsibility to determine the usability of these data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARC GRID
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CDROM
Recording_Format: ISO 9660
Compatibility_Information:
ISO 9660 format allows the CDROM to be read by most computer operating systems.
Fees: none
Ordering_Instructions:
Custom_Order_Process:
Contact the New Hanover County GIS Manager at 910.341.7474

 

 
 
 

Metadata_Reference_Information:
Metadata_Date: 19990722
Metadata_Review_Date: 19990722
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NOAA Coastal Services Center
Contact_Person: Metadata Specialist
Contact_Position: Metadata Specialist
Contact_Address:
Address_Type: Mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: SC
Postal_Code: 29505
Country: USA
Contact_Voice_Telephone: 843-740-1200
Contact_Facsimile_Telephone: 843-740-1315
Contact_Electronic_Mail_Address: csc.clearinghouse@noaa.gov
Hours_of_Service: Monday - Friday, 8:00am - 5:00pm EST
Metadata_Standard_Name: FGDC CSDGM
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.2.4 on Thu Aug 5 11:55:05 1999