North Carolina, Pamlico Sound Area, High-resolution Bathymetry

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: NOAA-National Ocean Service
Publication_Date: 1998
Title: North Carolina, Pamlico Sound Area, High-resolution Bathymetry
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Silver Spring, MD
Publisher: NOAA-National Ocean Service
Online_Linkage: <http://pubs.usgs.gov/of/2005/1306/data/basemap/estuarygrd.zip>
Larger_Work_Citation:
Citation_Information:
Originator: VeeAnn A. Cross
Originator: John F. Bratton
Originator: Emile Bergeron
Originator: Jeff K. Meunier
Originator: John Crusius
Originator: Dirk Koopmans
Publication_Date: 2005
Title:
Continuous Resistivity Profiling Data from the Upper Neuse River Estuary, North Carolina, 2004-2005
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2005-1306
Publication_Information:
Publication_Place: Woods Hole Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: <http://pubs.usgs.gov/of/2005/1306>
Description:
Abstract:
The Neuse River Estuary in North Carolina is a broad, V-shaped water body located on the southwestern end of Pamlico Sound. This estuary suffers from severe eutrophication for which several water quality models have recently been developed to aid in the management of nutrient loading to the estuary. In an effort to help constrain model estimates of the fraction of nutrients delivered by direct ground-water discharge, continuous resistivity profile (CRP) measurements were made during the spring of 2004 and 2005. CRP is used to measure electrical resistivity of sediments, a property that is sensitive to difference in salinity of submarine ground water. The 2004 and 2005 surveys used floating resistivity streamers of 100 m and 50 m respectively. The depth penetration of the streamers is approximately 20% of the streamer length which translates to approximately 20-25 m with the 100 m streamer and 12-14 m with the 50 m streamer. These data were processed using AGI's EarthImager 2D software. CRP data enables the mapping of the extent and depth of the fresher ground water within the estuary.
Purpose:
To provide high resolution bathymetry for the Pamlico Sound area in North Carolina.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1998
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.098977
East_Bounding_Coordinate: -75.464240
North_Bounding_Coordinate: 35.857169
South_Bounding_Coordinate: 34.694360
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: bathymetry
Theme_Keyword: CMGP
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: grid
Theme_Keyword: OF 2005-1306
Theme_Keyword: Open-File Report
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Woods Hole Science Center
Theme_Keyword: estuary
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: Neuse River
Place_Keyword: North America
Place_Keyword: North Carolina
Place_Keyword: Pamlico Sound
Place_Keyword: United States
Access_Constraints: None.
Use_Constraints: These data should not be used for navigation purposes.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter L. Grose
Contact_Organization: NOAA-NOS-Special Projects Office
Contact_Address:
Address_Type: mailing and physical address
Address: 1305 East West Hwy
Address: Room 09449
City: Silver Spring
State_or_Province: MD
Postal_Code: 20910-3278
Country: USA
Contact_Voice_Telephone: (301) 713-3000
Contact_Facsimile_Telephone: (301) 713-4384
Contact_Electronic_Mail_Address: peter.grose@noaa.gov
Data_Set_Credit:
This dataset was acquired from the NOAA NOS Estuarine Bathymetry website: <http://spo.nos.noaa.gov:16080/bathy/>.
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The accuracy of a DEM is dependent upon the level of detail of the source soundings and the grid spacing used to sample that source. The primary limiting factor for the level of detail of the source is the scale of the source survey, the technology used to collect soundings, and the resolution of the source soundings. Additional complications is describing accuracy are the ages of the surveys used to collect sounding in a given area. Care was used to use the most recent surveys covering a given area but in some instances adjacent surveys may be decades apart in age. In some regions, the only source data were at fathom (6 feet) resolution. In general, most source surveys were certified to one foot or better by the National Ocean Service.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The horizontal accuracy of the DEM is expressed as an estimated root mean square error (RMSE). The estimate of the RMSE is based upon horizontal accuracy tests of the source soundings used to generate the DEM. As a first approximation the locational accuracy of the source soundings are 0.0015 m at source "Smooth Sheet" scale (120 m @ 1:80,000 to 15 m @ 1:10,000). Smooth Sheets are maps generated as a principle product of each (historic) hydrographic survey with fully corrected soundings plotted on them.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 3 meters [estimated]
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The vertical RMSE statistic is used to describe the vertical accuracy of a DEM. It encompasses both random and systematic errors introduced during production of the data. The RMSE is encoded in element number 5 of record C of the DEM. This accuracy estimate includes components related to quantization of the source soundings (1.3 to 0.15 m), the systematic editing of the source data (1% or 0.10m), un-sampled bathymetric features (estimated at less than 5% of depth), time related changes (erosion, deposition, and seismic shifts), and dredging operations (cut and fill).

It is estimated that the accuracy of the Bathymetric DEMs is 2% of depth or 1 meter for depths grater than 20 meters and 2 % of depth or 0.20 meters for depths shallower than 20 meters.

THESE DEMs SHOULD NOT BE USED FOR NAVIGATION.

There are three types of DEM vertical errors: blunder, systematic, and random. These errors are reduced in magnitude by editing but cannot be completely eliminated. Blunders are errors of major proportions and are easily identified and removed during interactive editing. Systematic errors follow some fixed pattern and are introduced by data collection procedures and systems. Systematic error artifacts include vertical unsampled elevation shifts, relative spacing of the source soundings, misinterpretation of terrain surface caused by softness or poor reflectivity and by the resolution of the collected soundings (feet, feet & fractions, fathoms, fathoms & fractions, meters, tenths of meters etc.). Random errors result from unknown or accidental causes. The 1 degree (DSQ) DEMs are generated from 30 m grids on UTM projection. The rms difference between these surfaces is an estimate of the vertical accuracy of the DSQ DEMs.

Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: NOAA National Ocean Service
Publication_Date: 2000
Title: Estuarine Bathymetry
Publication_Information:
Publication_Place: Silver Spring, MD
Publisher: National Oceanic and Atmospheric Administration
Other_Citation_Details: website
Online_Linkage: <http://spo.nos.noaa.gov:16080/bathy/>
Type_of_Source_Media: website
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1850
Ending_Date: 1980
Source_Currentness_Reference: publication date
Source_Contribution:
A thorough metadata file generalized for the generic bathymetric digital elevation model is available from the website. What follows is the text supplied on the NOAA website regarding these data: The high resolution bathymetric data are gridded to 30m cells defined on a UTM projection where the locations of the value for each cell are at coordinates in UTM meter units evenly divisible by 30. The origin of these units is 500,000 meters west of the central meridian for the UTM projection and the equator. It should be noted that these UTM grids do NOT align with geographic parallels and meridians which define the extents of these DEM data sets. These 30m gridded data are equivalently referred to as UTM, 7.5 minute, or 30m data. In this context these terms are interchangeable.

Null values (encoded -32767 within the DEMs) are used to represent all locations either above (outside) the local high water datum (the shoreline as defined by the National Ocean Service) or outside the extents of the estuary as delineated by the CAF.

Bathymetric elevations within these data sets are referenced to the local tidal datum which typically is Mean Lowest Low Water (MLLW) averaged over a 19 year tidal epoch. Elevations above this datum (between the datum and the shoreline) have positive values (meters to centimeter resolution) while those below are negative. Note that this datum is different from that used by USGS for land elevation data that it distributes in DEM form which are referenced to Mean Sea Level (MSL).

Process_Step:
Process_Description:
The high-resolution bathymetric data file for the Pamlico Sound area was downloaded form the website and uncompressed.
Source_Used_Citation_Abbreviation: S020_B30.zip
Source_Produced_Citation_Abbreviation: S020_35076C3_BIG.dem
Process_Step:
Process_Description:
The resulting DEM file was imported using ArcGIS 9.0. The conversion tool from ArcToolbox "Dem to raster" was used to create a floating point grid.
Source_Used_Citation_Abbreviation: S020_35076C3_BIG.dem
Source_Produced_Citation_Abbreviation: demtora_s0201
Process_Step:
Process_Description:
The floating point grid was reprojected from the NAD27 datum to the NAD83 datum, maintaining its UTM projection specification.
Source_Used_Citation_Abbreviation: demtora_s0201
Source_Produced_Citation_Abbreviation: neuse_bathy

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 4237
Column_Count: 4902
Vertical_Count: 1

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 18
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -75.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 30.000000
Ordinate_Resolution: 30.000000
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 82.949

Metadata_Reference_Information:
Metadata_Date: 20051205
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Generated by mp version 2.8.6 on Mon Dec 05 13:45:42 2005