U.S. Geological Survey
19970430
Bathymetric Map of the Bering/Chukchi Sea
vector digital data
Anchorage, Alaska
U.S. Geological Survey
Citation of the source map: Schumacher, G. M. 1976. Bathymetric map of the Chukchi Sea and Arctic Ocean. USGS Open-File Report 76-823. Schumacher, G. M. 1976. Bathymetric map of the Aleutian Trench and Bering Sea. USGS Open-File Report 76-821.
https://cmgds.marine.usgs.gov/data/walrus/berchuk.zip
Two bathymetric maps were developed by the U.S. Geological Survey, one for the Chukchi Sea and Arctic Ocean, and one for the Aleutian Trench and Bering Sea. The 2 maps overlap near the Bering Strait. Bathymetric contours were generated from several published sources. It is unclear whether new soundings were collected for these maps. The northern map extends from Wrangel Island, Russia to MacKenzie Bay, Canada, and north to 76 N latitude. The southern map extends from Shelikof Bay, Russia, to the western tip of the Alaska Peninsula, USA, and south to 48 N latitude. Bathymetric contours are at 400 meter intervals with 20, 30, 40, 50, 100, and 200 meter contours added. Contours above 50 meters are rare, and never along the Russian coast. Hard-copy maps were published by the USGS in 1976 and digitized by the Alaska Science Center in 1997. In digital format, the 2 maps have been connected where they overlap in the Bering Strait.
The maps were produced to aid in geophysical research and exploration in the Bering and Chukchi Seas.
The USGS Alaska Science Center created this and other digital bathymetry coverages to support marine animal research in the Bering and Chukchi Seas. The completed coverages are being stored on the Coastal and Marine Geoscience Data System (CMGDS) for archival purposes only. The coverage "Bathymetric Map of the Bering/Chukchi Sea" is titled BERCHUK_3GEO (ber=bering sea, chuk=chukchi sea, 3=polygon topology, geo=geographic projection)
1976
map publication date
None
154
-130
76
48
USGS Metadata Identifier
USGS:88c8475f-bf4c-4aca-9089-8e6d29279750
ISO 19115 Topic Category
geoscientificInformation
oceans
None
contours
Data Categories for Marine Planning
distributions
bathymetry and elevation
USGS Thesaurus
bathymetry
contouring
computational methods
None
western Alaska
eastern Russia
Bering Sea
Chukchi Sea
None
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey and Geological Society of America as the originator of the dataset.
Alaska Science Center, Marine and Fresh Water Ecology Branch
mailing and physical
Biological Resources Division, U.S. Geological Survey
1011 E. Tudor Road
Anchorage
Alaska
99503
USA
907-786-3512
907-786-3636
8:00 am to 4:00pm Monday through Friday
None
Esri Arc/INFO 7.1
National Ocean Service
U.S. Department of Commerce
Unknown
Coastal Shelf Bathymetry of the Bering, Chukchi, and Beaufort Seas
Map
Washington, D.C.
Department of Commerce, NOAA, NOS
Bathymetric maps available for purchase from National Geophysical Data Center, E/GC3, 325 Broadway, Boulder, Colorado 80303-3228.
U.S. Geological Survey
1976
Plate 1. Topographic and Bathymetric Map of the Northern Bering Sea Region
Map
U.S. Geological Survey Professional Paper
759-B
Washington, D.C.
U.S. Government Printing Office
Hopkins, D.M., Nelson, C.H., Perry, R.B., and Alpha, T.R., 1976, Physiographic subdivisions of the Chirikov Basin, Northern Bering Sea (studies on the marine geology of the Bering Sea): Geological Survey Professional Paper 759-B, U.S. Government Printing Office, 7 pp, 3 plates.
U.S. Geological Survey
1984
Bathymetric map of the Chukchi Sea
Map
Miscellaneous Investigations Series
Map I-1182-D
Washington, D.C.
U.S. Geological Survey
Hill, E.R., Grantz, A., May, S.D., and Smith, M., 1984, Bathymetric map of the Chukchi Sea: U.S. Geological Survey, Miscellaneous Investigations Series I-1182-D.
U.S. Geological Survey
1988
Bathymetric Map of the Bowers Basin and Aleutian Basin east of the U.S.-U.S.S.R. 1867 Convention Line, Bering Sea
Map
Open-File Report
89-548
Menlo Park, CA
U.S. Geological Survey
Hall, R.K., Karl, H.A., Carlson, P.R., Cooper, A.K., Gardner, J..V., Hunter, R.E., Marlow, M.S., and Stevenson, A.J., 1989, Bathymetric map of the Aleutian Basin and Bowers Basin east of the U.S.-U.S.S.R. 1867 Convention Line, Bering Sea: U.S. Geological Survey Open-File Report 89-548, 6 pp, 1 map, scale 1:2,000,000.
Geological Society of America
1974
Bathymetric Map of the Bering Sea
Map
Boulder, CO
Geological Society of America
Pratt, R., and Walton, F., 1974, Bathymetric map of the Bering Sea: The Geological Society of America, Boulder, CO.
Attribute accuracy was tested by manually comparing hard copy plots to the source maps.
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 well snap together and close polygons based on a specified tolerance. If the node is not within tolerance it is adjusted manually. The tests for logical consistency are performed in Arc/INFO.
All contours for both maps were digitized at a high level of accuracy. After digitizing was completed , a 1:2,000,000 scale coastline (source = digital chart of the world) was added to the coverage to provide a land reference and complete the nearshore polygons.
Horizontal accuracy was tested using Arc/INFO's RMS errors generated when the digitized map is converted from table inches to real world coordinates. RMS errors ranged from 0.002 to 0.004 during map registration. In addition, the joined maps were displayed with Russian and Alaska coastlines with high accuracy. There are several islands in the Aleutian chain that appear to cross the closest bathymetric contour, a problem that may be related to the resolution and accuracy of the coastline coverage as much as the bathymetry coverage.
U.S. Geological Survey
1976
Bathymetric map of the Chukchi Sea and Arctic Ocean.
Open-File Report
76-821 and 76-823
Washington, D.C.
U.S. Geological Survey
Schumacher, G.M., 1976, Bathymetric map of the Chukchi Sea and Arctic Ocean: USGS Open-File Report 76-823. -and- Schumacher, G.M. 1976, Bathymetric map of the Aleutian Trench and Bering Sea: USGS Open-File Report 76-821.
Map
1976
Publication date
USGS_berchuk
The map provided the bathymetric contours for the digitized vector data
Two separate tic bases were created in Arc/INFO using the generate command with the fishnet option for each map area. The tic bases were projected from geographic to Albers Equal Area (projection of the source maps) and used to register maps for digitizing. Central merideans were located from the source maps' author as -158 for 76-823 and 175 for 76-821. Arcs were hand digitized. The digitized version of 76-823 was projected to a central meridian of 175 to match 76-821 and the maps were appended together. A problem a\occurred with the Arc/INFO software when trying to project across 180 degrees. Arcs that straddled 180 were clipped and had to be manually snapped together. This will be a problem whenever this coverage is reprojected until Arc/INFO resolves the problem in the software. After the map was digitized and projected into geographic, the digital chart of the world coastline (1:2,000,000 scale) was added to provide a land reference and complete the near shore polygons. Processing tolerances were: weed 40 m, grain 40 m, dangle 0.1 m, and fuzzy 0.1 m. Note that the tolerances are listed in meters and the coverage is in geographic. THESE TOLERANCES SHOULD BE SPECIFIED IN ANY FUTURE CLEAN TO MAINTAIN THE INTEGRITY OF THE COVERAGE.
USGS_berchuk
199609
Alaska Science Center, Marine and Fresh Water Ecology Branch
mailing and physical
Biological Resources Division, U.S. Geological Survey
1011 E. Tudor Road
Anchorage
Alaska
99503
USA
907-786-3512
907-786-3636
8:00 am to 4:00pm Monday through Friday
None
Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog.
20170214
U.S. Geological Survey
Alan O. Allwardt
Contractor -- Information Specialist
mailing and physical address
2885 Mission Street
Santa Cruz
CA
95060
831-460-7551
831-427-4748
aallwardt@usgs.gov
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
20201019
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Edited metadata to fix validation errors and to bring it up to FGDC CSDGM current standards based on data release policies for USGS Coastal and Marine Hazards and Resources Program (CMHRP). No data were changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent.
20211118
U.S. Geological Survey
Susan Cochran
Geologist
Mailing and Physical
2885 Mission Street
Santa Cruz
CA
95060
831-460-7545
scochran@usgs.gov
Bathymetric contours
Vector
String
5380
Entity point
460
GT-polygon composed of chains
461
Entity point
11
4.1101378883467987e-005
4.1101378883467987e-005
Decimal Degrees
D Clarke 1866
Clarke 1866
6378206.4
294.9786982
No correction
400
meters; 10m, 50m, and 400m contours are represented
Attribute values
berchuk_3geo.aat
Bathymetric Map of the Bering/Chukchi Sea Arc Attribute Table (arcs)
USGS; ESRI
FID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
FNODE#
Internal node number for the beginning of an arc (from-node).
ESRI
Whole numbers that are automatically generated.
TNODE#
Internal node number for the end of an arc (to-node).
ESRI
Whole numbers that are automatically generated.
LPOLY#
Internal node number for the left polygon.
ESRI
Whole numbers that are automatically generated.
RPOLY#
Internal node number for the right polygon.
ESRI
Whole numbers that are automatically generated.
LENGTH
Length of feature in internal units.
ESRI
Positive real numbers that are automatically generated.
BERCHUK#
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
BERCHUK-ID
User-defined feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
DEPTH
Depth in meters below sea level for each contour.
USGS
20
8000
meters
CLASS
A categorical variable to define the line type.
USGS
Class=0 for digitized bathymetric contours; class=8 for arcs that were added to close polygons; and class=9 for the Russian and US/Canadian coastlines. There were 2 cases where class 8 arcs were used: (1) when contours ended because adjoining contours were too close, and (2) the box used as the perimeter of the coverage.
berchuk_3geo.pat
Bathymetric Map of the Bering/Chukchi Sea Polygon Attribute Table (polygons)
USGS; ESRI
FID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
AREA
Area of feature in internal units squared.
ESRI
Positive real numbers that are automatically generated.
PERIMETER
Perimeter of feature in internal units.
ESRI
Positive real numbers that are automatically generated.
BERCHUK#
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
BERCHUK-ID
User-defined feature number.
ESRI
Sequential unique whole numbers that were automatically generated.
MID_DEPTH
Polygon attribute calculated as the mid-point between bounding arcs, e.g. mid-depth between 50 and 100 meter contours equals 75 meters, and between 4,000 and 4,400 meter contours is 4,200 meters. Where a bathymetric contour was an "island" and there was no further depth information inside the "island", the mid-depth was coded as the bounding contour's depth.
USGS
25
8000
The coverage contains two attributes pertinent for data analysis and display (depth and mid-depth, and one attribute that specifies the line type (class). Depth is an arc attribute (.aat) that specifies the ocean depth at each contour in meters. Mid-depth is a polygon attribute (.pat) calculated from the depth values of each polygon's bounding contours (e.g. a polygon with bounding contours of 30 m and 40 m would be 35 m). Class displays the type of line, 0 for digitized contours, 9 for the coastline, and 8 for arcs added to close polygons.
Producer
Alaska Science Center, Marine and Fresh Water Ecology Branch
Mailing and physical
1011 E. Tudor Road
Anchorage
Alaska
99503
USA
907-786-3512
907-786-3636
8:00am to 4:00pm Monday through Friday
None
Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS) 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 any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that these data are directly acquired from USGS server, and not indirectly 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 USGS shall not be held liable for improper or incorrect use of the data described and/or contained herein.
ArcInfo Interchange
Version 7.1
ArcInfo Interchange file (E00) and Zip (.zip)
4
https://cmgds.marine.usgs.gov/data/walrus/berchuk.zip
Use internet browse or file manager application (such as Windows Explorer) to access the directory (http://cmgds.marine.usgs.gov/data/walrus/) and download berchuk.zip
None, if obtained online.
20211118
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998