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Metadata:

Identification_Information:

Citation:

Citation_Information:

Originator: NOAA-National Ocean Service

Publication_Date: 19980606

Title: Bathymetric Digital Elevation Models at 30 meter resolution

Geospatial_Data_Presentation_Form: map

Series Information

Series Name:

Issue Identification:

Publication_Information:

Publication_Place: Silver Spring, MD

Publisher: NOAA-National Ocean Service

Description:

Abstract:
Purpose:
Supplemental_Information:
Time_Period_of_Content:

Currentness_Reference: ground condition

Range_of_Dates/Times:
Beginning_Date:
Ending_Date:

Status
Progress: complete
Maintenance_and_Update_Frequency:

Spatial_Domain West_Bounding_Coordinate -125.00
East_Bounding_Coordinate -65.00
North_Bounding_Coordinate 50.00
South_Bounding_Coordinate 24.00
Keywords Theme_Keyword_Thesaurus none
Theme_Keyword DEM
Theme_Keyword digital elevation model
Theme_Keyword digital bathymetric model
Theme_Keyword digital terrain model
Theme_Keyword bathymetry
Theme_Keyword altitude
Theme_Keyword height
Theme_Keyword depth
Place Access_Constraints none
Use_Constraints
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.
Logical_Consistency_Report:
Completeness_Report:
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.
Horizontal_Positional_Accuracy: Value: 3 meters [estimated]
Horizontal_Positional_Accuracy: Explanation: Digital elevation models meet
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:

Originator: National Oceanic and Atmospheric Administration-
Publication_Date: 1997
Title: National Ocean Service- Hydrographic Survey Data
Publication_Information:

Publication_Place: Boulder CO

Publisher: National Geophysical Data Center

Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:

Single_Date/Time:

Calendar_Date:

Time_of_Day:

Source_Citation: Abbreviation: GEODAS vol 2 ver 3.3
Source_Contribution: Hydrographic Soundings
Source_Information:
Source_Citation:

Originator: National Oceanic and Atmospheric Administration

Publication_Date: 1994

Title: Medium Resolution Vector Shoreline

Publication_Information:

Publication_Place: Boulder CO
Publisher: National Ocean Survey
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:
Calendar_Date:
Time_of_Day:

Source_Currentness_Reference Publication_Date
Source_Citation_Abbreviation: NOAA
Source_Contribution: Shoreline position
Process_Step:

Process_Description:

Process_Date:
Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: raster

Raster_Object_Information:

Raster_Object_Type: grid cell
Row_Count: 470
Column_Count: 470
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
Longitude_of_Central_Meridian: -75.0

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000

False_Northing: 0.0

Scale_Factor_at_Central Meridian: 0.999

Planar_Coordinate_Information:

Coordinate_Representation:

Abscissa_Resolution: 30

Ordinate_Resolution: 30

Planar_Distance_Units: meters
Geodetic_Model:

Horizontal_Datum_Name: North American Datum 1927

Ellipsoid_Name: Clark 1866

Semi-major_Axis: 6378206.4

Denominator_of_Flattening Ratio: 294.9787

Vertical_Coordinate_System_Definition:
Altitude_System_Definition:

Altitude_Datum_Name: National Geodetic Vertical Datum of 1929

Altitude_Resolution: 1

Altitude_Distance_Units: meters

Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Entity_Type
Entity_Type_Label
Entity_Type_Definition
Entity_Type_Definition Source:
Entity_and_Attribute_Detail_Citation:

U.S. Department of the Interior, U.S. Geological Survey, 1992, Standards for digital elevation models:
Reston, VA, A hypertext version is available at:
<http://www-nmd.usgs.gov/www/ti/DEM/standards_dem.html>
Softcopy in ASCII format is available at:
<ftp://www-nmd.usgs.gov/www/ti/DEM/stdempt1.txt>
<ftp://www-nmd.usgs.gov/www/ti/DEM/stdempt2.txt>
<ftp://www-nmd.usgs.gov/www/ti/DEM/stdempt3.txt>
Softcopy in WordPerfect format is available at:
<ftp://www-nmd.usgs.gov/www/ti/DEM/stdempt1.wp5>
<ftp://www-nmd.usgs.gov/www/ti/DEM/stdempt2.wp5>
<ftp://www-nmd.usgs.gov/www/ti/DEM/stdempt3.wp5>
Softcopy in PostScript format is available at:
<ftp://www-nmd.usgs.gov/www/ti/DEM/stdempt1.ps>
<ftp://www-nmd.usgs.gov/www/ti/DEM/stdempt2.ps>
<ftp://www-nmd.usgs.gov/www/ti/DEM/stdempt3.ps>
Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: National Oceanic and Atmospheric Administration
Contact_Address:

Address_Type: mailing address

Address:
NOAA-NOS-SPO room 09449 SSMC4

1305 East West Highway

City: Silver Spring

State_or_Province: Maryland

Postal_Code: 20192

Contact_Voice_Telephone: 1 301 713-3000
Hours_of_Service: 0800-1600 Monday -Friday
Resource_Description: 7.5-minute digital elevation models
Resource_Description: 1 Degree-minute digital elevation models
Standard_Order_Process:
Digital_Form:

Digital_Transfer_Information:

Format_Name: DEM
Transfer_Size:

Digital_Transfer_Option
Online_Option:

Computer_Contact_Information:

Network_Address:
Network_Resource_Name: <http://mapfinder.nos.noaa.gov>
Network_Resource_Name:
<http://www-orca.nos.noaa.gov/projects/bathymetry/bathymetry.html>
Offline_Option:

Offline_Media: CD-Recordable

Recording_Capacity:

Recording_Density: 650
Recording_Density_Units: megabytes
Recording_Format:

ISO 9660; the files are placed in a flat directory on the CD with
naming conventions that are ISO 9660 Level 1 compliant (DOS 8.3).
Fees:
Metadata: Reference Information
Metadata_Reference_Information:

Metadata: Date: 19980606

Metadata_Review_Date:

Metadata_Future_Review_Date:
Metadata_Contact:

Contact_Person_Primary:

Contact_Person:
Contact_Organization:

Contact_Organization_Primary
Contact_Organization: National Ocean Service
Contact_Person:
Contact_Position:
Contact_Address:

Address_Type: mailing address

Address: 1305 Eastwest Highway

City: Silver Spring

State_or_Province: Maryland

Postal_Code: 20910

Country:

Contact_Voice_Telephone:

Contact_TDD/TTY_Telephone
Contact_Facsimile_Telephone
Contact_Electronic_Mail_Address
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: June 8, 1994
Generated by mp version 2.9.14 on Fri Oct 7 07:12:03 2011