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Coastal Bathymetry of the Bering, Chukchi and Beaufort Seas

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
Resource Data INC., Anchorage, AK, under contract to USGS, BRD, Alaska Biological Science Center
Publication_Date: 19970000
Title: Coastal Bathymetry of the Bering, Chukchi and Beaufort Seas
Online_Linkage: <URL:https://agdc.usgs.gov/data/projects/anwr/anwr.html>
Description:
Abstract:
Bathymetric contours were generated from soundings collected by
National Ocean Service vessels from 1900 to 1971. The 1:250,000
maps are available for U.S. coastal waters. Bathymetric contours
are in meters, with 10 meter intervals out to 200 m, supplemented
by 2 m contours. Beyond 200 m, contours are at 50 m intervals
to maximum depth. The GIS database derived from these maps includes
the Bering, Chukchi, and Beaufort Seas in western and northern
Alaska. Approximately 100 maps.
Purpose:
The Bathymetric Map series was developed to provide detailed contours of underwater features. The maps serve as a basic tool for performing scientific, engineering, marine geophysical, and marine environmental studies. The maps were not intended to be used for navigation.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 189901
Ending_Date: 197112
Currentness_Reference: Publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -178
East_Bounding_Coordinate: -138
North_Bounding_Coordinate: 74
South_Bounding_Coordinate: 53
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Bathymetry
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Beaufort Sea
Place_Keyword: Chukchi Sea
Place_Keyword: Bering Sea
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Biological Resources Division
Contact_Person: David Douglas
Contact_Address:
Address_Type: mailing address
Address: 1011 East Tudor Road
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99503
Contact_Voice_Telephone: (907) 786-3473
Contact_Electronic_Mail_Address: david_douglas@usgs.gov
Native_Data_Set_Environment: UNIX-ARC/INFO

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attribute accuracy was tested by manually comparing hard copy plots to the source maps. Accuracy of the source maps is related to the contouring algorithm used to derive the contours and changes in bathymetry since the data were collected. The NOS point data near the Aleutian Islands was not well registered with the coastline. Depths up to 30 m crossed the digitized coastline by up to 200 m and were clipped from the final coverage. It is unknown which data were incorrect, digitized coastline or point locations.
Logical_Consistency_Report:
All polygon features are checked for topology using Arc/INFO software. Each polygon begins and ends with a node feature. All nodes are checked for errors so that there are no dangling features. There are no duplicate lines or polygons. All nodes will snap together and close polygons based on a specified tolerance. If the node is not within the tolerance it is adjusted manually. The tests for logical consistency are performed in Arc/INFO.
Completeness_Report:
Contours were digitized from NOS bathymetric maps (90 percent) or generated from NOS bathymetric sounding point data (10 percent) where digitizing was difficult and high density point data were available. Contours are at 10 m intervals out to 200 m. Intermediate contours were not included, because many were dangling arcs which could not be used to build polygons. Contours beyond 200 m are available on the source maps, but were not included in the GIS database. The source maps included holiday areas where NOS collected no sounding data, and no bathymetric contours or points are available, these areas are defined in the coverage. A 1:250000 Alaska Department of Natural Resources coastline was added to the coverage to provide a land reference.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positional accuracy was tested using ARC/INFO's RMS errors generated when the the digitzed map is converted from table inches to real world coordinates. RMS errors averaged 150m for the approximately 100 maps digitized.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: United States Geological Survey
Publication_Date: 19740000
Title: Bathymetric Map of the Bering Shelf
Type_of_Source_Media: Map
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19740000
Source_Currentness_Reference: Publication date
Source_Citation_Abbreviation:
The Geological Society of America. 1974. Bathymetric Map of the bering Shelf. The Geological Society of America, Boulder, CO.
Source_Contribution: Map Compiled by Richard Pratt and Fred Walton, NOS
Source_Information:
Source_Citation:
Citation_Information:
Originator: United States Geological Survey
Publication_Date: 19760000
Title:
Bathymetric Map of the Chukchi Sea and Arctic Ocean & Bathymetric Map of the Aleutian Trench and Bering Sea
Type_of_Source_Media: Open file report
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19740000
Source_Currentness_Reference: Publication date
Source_Citation_Abbreviation:
United States Geological Survey, 1976. Bathymetric Map of the Chuckchi Sea and Arctic Ocean and Bathymetric Maps of the Aleutian Trench and bering Sea. Open File Reports 76-821 and 76-823. US Geological Survey, Washington D.C.
Source_Contribution: Schumacher, G. M.
Source_Information:
Source_Citation:
Citation_Information:
Originator: United States Geological Survey
Publication_Date: 19760000
Title:
Opographic and Bathymetric map of the Northern Bering Sea Region
Type_of_Source_Media: Geological Survey Professional Paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19740000
Source_Currentness_Reference: Publication date
Source_Citation_Abbreviation:
U.S. Geological Survey. 1976. Plate 1 Topographic and Bathymetric Map of the Northern Bering Sea region. USGS Professional Paper 759-B. US Government Printing Office, Washington DC.
Source_Contribution: D.M. Hopkins, C.H.Nelson, R.B. perry, T.R. Ralph
Source_Information:
Source_Citation:
Citation_Information:
Originator: United States Geological Survey
Publication_Date: 19840000
Title: Bathymetric map of the Chukchi Sea
Type_of_Source_Media: Miscellaneous Investigations Series
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19740000
Source_Currentness_Reference: Publication date
Source_Citation_Abbreviation:
USGS. 1984. Bathymetric Map of the Chukchi Sea. Misc. Investigations Series Map I-1182-D. USGS. Washigton D.C.
Source_Contribution: E.R. Hill, A. Grantz, S.D. May, M. Smith
Process_Step:
Process_Description:
Approximately 100 maps from the NOS Bathymetric Map series were selected to be digitized. Ocean depth point data from National Ocean Service cruises (a subset of the data used to develop the bathymetric map series) was used to generate contours where the map contours were extremely difficult to digitize. The generated contours were usually similar to the map contours, and where large discrepencies occurred the lines were digitized from the maps and the generated contours removed. Contours were generated in north Bristol Bay, small areas on the northwest side of the Alaska Peninsula, around the eastern Aleutian Islands and St. Paul Island, and a large area from Seward Peninsula to St. Lawrence Island. All other areas were digitized from the NOS maps. Areas where NOS had no bathymetric data (defined by NOS as holiday areas) were blocked and defined as areas with no data, no attempt was made to generate contours in these areas. Small holiday areas occurred along the coast of the Aleutian Islands and Alaska Peninsula, west side of Nushagak Peninsula, north of Hagemeister Island, sourth side of St. George Island, north side of Nunavak Island, west and north sides of Seward Peninsula and a small pocket in the Beaufort Sea north of Prudhoe Bay. Larger holiday areas occur at the mouth of the Yukon and Kuskokwim Rivers and around the coast of St. Lawrence Island. Additionally, no map is available for the east end of Kotzebue Sound.
Process_Date: 19970000

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Ring composed of arcs
Point_and_Vector_Object_Count: 14861
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 10345
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 10345

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel: 55
Standard_Parallel: 65
Longitude_of_Central_Meridian: -154
Latitude_of_Projection_Origin: 50
False_Easting: 0
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Coordinate pair
Coordinate_Representation:
Abscissa_Resolution: Unknown Ordinate Resolution: Unknown
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: ELEVATION (polygon attribute)
Entity_Type_Definition:
Midpoint of bounding arcs, eg the elevation between -10 and -20m isobaths equals -15 m. Where a bathymetric contour was an "island" and there was no depth information inside the island, the elevation was coded as the bounding contour's depth. Elevations range from -5 to -195 m. Enclosed polygons deeper than 200 m are coded -999. "Holiday areas" with no bathymetric data are coded +999. enclosed polygons outside the map area are coded +998. All land polygons are labeled +5.
Entity_Type_Definition_Source: U.S. Department of Commerce
Entity_Type:
Entity_Type_Label: Elevation (vector attribute)
Entity_Type_Definition:
Depth of bathymetric contour, in negative meters. Used to calculate the polygon mid-depth elevation attribute. Arcs used to define the map boundary, holiday areas, and to clip dangling contours to the next shallowest contour are coded 999.
Entity_Type_Definition_Source: U.S. Department of Commerce
Entity_Type:
Entity_Type_Label: Methods
Entity_Type_Definition:
An arc attribute describing the method used to develop contours. Contours digitized from the NOS maps are coded "DIGITIZE", and contours that were generated from the NOS survey point data are coded "GENERATE".
Entity_Type_Definition_Source: Resource Data Inc.
Overview_Description:
Entity_and_Attribute_Overview:
Ocean depths
Entity_and_Attribute_Detail_Citation: None

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USGS, Alaska Geospatial Data Clearinghouse
Contact_Person:
Contact_Address:
Address_Type: mailing and physical address
Address: 4230 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508-4664
Contact_Voice_Telephone: (907) 786-7020
Distribution_Liability:
Although these data have been processed successfully on a computer system at the Biological Resources Division, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute such warranty. This disclaimer applies both to individual use of the data or aggregate use with other data. It is strongly recommended that these data are directly acquired from the Biological Resources Division server, and not directly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The Biological Resource Division shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name:
gzip-compressed TAR-archive of ARC/INFO export (.e00) file ARC/INFO export compression = NONE
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<URL:https://agdcftp1.wr.usgs.gov/pub/projects/anwr/tar_files/nosbath.tar.gz>
Fees: None

Metadata_Reference_Information:
Metadata_Date: 19971001
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
USGS Biological Resources Div., Alaska Biological Science Center
Contact_Person: David C. Douglas
Contact_Address:
Address_Type: mailing address
Address: 1011 East Tudor Road
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99503
Country: USA
Contact_Voice_Telephone: 907-786-3512
Contact_Electronic_Mail_Address: david_douglas@usgs.gov
Contact_Instructions:
The USGS/BRD Alaska Biological Science Center will be making an effort to keep the information provided in these metadata records current. Please send corrections, additions and suggestions for improvement to David Douglas at the above address.
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: June 8, 1994


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Page Last Modified: Wednesday, 07-Dec-2016 11:52:27 AKST