Geological Society of America Gulf of Andyr Bathymetry

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Frequently anticipated questions:


What does this data set describe?

Title: Geological Society of America Gulf of Andyr Bathymetry
Abstract:
Bathymetric contours were generated from soundings collected during surveys and cruises by the Hydrographic Office, National Ocean Survey, and Coast and Geodetic Survey. The region covered by the map is the Bering Sea Shelf from Bristol Bay, Alaska to the Gulf of Anadyr, Russia. Bathymetry is in meters at 10 m intervals, with 5 m supplemental contours. The digitized portion includes the Anadyr Gulf and Bering Strait in Russian waters (west of the Exclusive Economic Zone), to supplement digitized National Ocean Service maps of US waters (Coastal Shelf Bathymetry of the Bering, Chukchi, and Beaufort Seas). The original paper map was produced by the Geological Society of America and published in 1974. In 1997, the USGS digitized the bathymetric contours for research purposes.
Supplemental_Information:
The USGS Alaska Science Center created these 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 "GSA Gulf of Andyr Bathymetry" is titled ANADBATH_3GEO (anad=Anadyr Gulf, bath=bathymetry, 3=polygon topology, geo=geographic projection)
  1. How might this data set be cited?
    U.S. Geological Survey, 19970430, Geological Society of America Gulf of Andyr Bathymetry: U.S. Geological Survey, Anchorage, Alaska.

    Online Links:

    Other_Citation_Details: Map compiled by Richard Pratt and Fred Walton.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -180
    East_Bounding_Coordinate: -168
    North_Bounding_Coordinate: 66
    South_Bounding_Coordinate: 60
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1974
    Currentness_Reference:
    map publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference: Bathymetric contours
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • String (283)
      • Entity point (93)
      • GT-polygon composed of chains (93)
      • Entity point (4)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0020000000949949026. Longitudes are given to the nearest 0.0020000000949949026. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is D Clarke 1866.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.9786982.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: not specified on source map
      Depth_Resolution: 10
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    anadbath.aat
    Bathymetry of the Gulf of Anadyr Arc Attribute Table (arcs) (Source: USGS; ESRI)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    FNODE#
    Internal node number for the beginning of an arc (from-node). (Source: ESRI) Whole numbers that are automatically generated.
    TNODE#
    Internal node number for the end of an arc (to-node). (Source: ESRI) Whole numbers that are automatically generated.
    LPOLY#
    Internal node number for the left polygon. (Source: ESRI) Whole numbers that are automatically generated.
    RPOLY#
    Internal node number for the right polygon. (Source: ESRI) Whole numbers that are automatically generated.
    LENGTH
    Length of feature in internal units. (Source: ESRI) Positive real numbers that are automatically generated.
    ANADBATH#
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    ANADBATH-ID
    User-defined feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    ELEVATION
    Depth of bathymetric contour lines, in negative meters. Used to calculate polygon mid-depth elevation attribute. Arcs that fall along area boundaries or that were used to close dangling contours are coded with an elevation of 998. (Source: USGS)
    Range of values
    Minimum:0
    Maximum:-200
    Units:meters
    OVERLAP
    Features in the area of overlap between this dataset and the Coastal Shelf Bathymetry map are coded "T", all other features are coded "F". This attribute was included to aid in edge-matching the 2 datasets by product users. (Source: USGS)
    ValueDefinition
    T/FTrue (T) or False (F)
    anadbath.pat
    Bathymetry of the Gulf of Anadyr Polygon Attribute Table (polygons) (Source: USGS; ESRI)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    AREA
    Area of feature in internal units squared. (Source: ESRI) Positive real numbers that are automatically generated.
    PERIMETER
    Perimeter of feature in internal units. (Source: ESRI) Positive real numbers that are automatically generated.
    ANADBATH#
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    ANADBATH-ID
    User-defined feature number. (Source: ESRI) Sequential unique whole numbers that were automatically generated.
    ELEVATION
    Polygon attribute calculated as the mid-point between bounding arcs, eg the elevation between -10 m and -20 m 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. All land polygons are labeled +5 m. (Source: Geological Society of America)
    Range of values
    Minimum:-195
    Maximum:5
    OVERLAP
    Features in the area of overlap between this dataset and the Coastal Shelf Bathymetry map are coded "T", all other features are coded "F". This attribute was included to aid in edge-matching the 2 datasets by product users. (Source: USGS)
    ValueDefinition
    T/FTrue (T) or False (F)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Alaska Science Center, Marine and Fresh Water Ecology Branch
    Biological Resources Division, U.S. Geological Survey
    Anchorage, Alaska
    USA

    907-786-3512 (voice)
    907-786-3636 (FAX)
    Hours_of_Service: 8:00 am to 4:00pm Monday through Friday
    Contact_Instructions: None

Why was the data set created?

The map was produced by The Geological Society of America during a period of mineral and seismic exploration in the Bering Sea. The map was digitized by the USGS for purposes of marine animal research.

How was the data set created?

  1. From what previous works were the data drawn?
    GSA_Bathymetry_Bering (source 1 of 1)
    The Geological Society of America, 1974, Bathymetric Map of the Bering Sea: The Geological Society of America, Boulder, CO.

    Type_of_Source_Media: Map
    Source_Contribution:
    The map provided the bathymetric contours for the digitized vector data
  2. How were the data generated, processed, and modified?
    Date: 1997 (process 1 of 2)
    Contours in Russian waters of the Bering Sea shelf were digitized from the Bathymetric Map of the Bering Shelf published by The Geological Society of America. An additional strip was digitized on the US side of the Exclusive Economic Zone, providing overlap to the Coastal Shelf Bathymetry map to allow for edge-matching by product users. Contours were digitized at 10 m intervals except where contours were missing from the source map. Person who carried out this activity:
    Resource Data, Inc., Anchorage, Alaska

    Data sources used in this process:
    • GSA_Bathymetry_Bering
    Date: 14-Feb-2017 (process 2 of 2)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
  3. What similar or related data should the user be aware of?
    Service, National Ocean, and U.S. Department of Commerce, multiple, Coastal Shelf Bathymetry of the Bering, Chukchi, and Beaufort Seas: Bathymetric Maps, Department of Commerce, NOAA, NOS, Washington, D.C..

    Other_Citation_Details:
    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: U.S. Geological Survey Professional Paper 759-B, U.S. Government Printing Office, Washington, D.C..

    Other_Citation_Details:
    Hopkins, D. M., C. H. Nelson, R. B. Perry, and T. R. Alpha. 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. 7pp. 3 plates.
    U.S. Geological Survey, 1984, Bathymetric map of the Chukchi Sea: Miscellaneous Investigations Series Map I-1182-D, U.S. Geological Survey, Washington, D.C..

    Other_Citation_Details:
    Hill, E. R., A. Grantz, S. D. May, and M. Smith. 1984. Bathymetric map of the Chukchi Sea. U.S. Geological Survey, Misc. Inves. Series I-1182-D.
    U.S. Geological Survey, 1976, Bathymetric Map of the Chukchi Sea and Arctic Ocean & bathymetric Map of the Aleutian Trench and Bering Sea: Open File Report 76-821 and 76-823, U.S. Geological Survey, Washington, D.C..

    Other_Citation_Details:
    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.

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    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, accuracy and density of soundings used to generate contours, and changes in bathymetry since the data were collected.
  2. How accurate are the geographic locations?
    Horizontal positional 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 were low.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Contours were digitized from the Bathymetric Map of the Bering Shelf published by The Geological Society of America. Contours were digitized at 10 m intervals to 200 m. Intermediate 5 m contours were not included in the GIS product because many were dangling arcs that could not be used to build polygons. Contours beyond 200 m are available on the source map, but were not included in the digitized product. Only the part of the map in Russian waters (west of the Exclusive Economic Zone) was digitized to provide a compliment for the Coastal Shelf Bathymetry map (see cross-references).
  5. How consistent are the relationships among the observations, including topology?
    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.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
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.
  1. Who distributes the data set? (Distributor 1 of 1)
    Alaska Science Center, Marine and Fresh Water Ecology Branch
    1011 E. Tudor Road
    Anchorage, Alaska
    USA

    907-786-3512 (voice)
    907-786-3636 (FAX)
    Hours_of_Service: 8:00am to 4:00pm Monday through Friday
    Contact_Instructions: None
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    Although these data have been processed successfully on a computer system at the Alaska Science Center, Biological Resources Division, US Geological Survey, 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 an Alaska Science Center 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 Alaska Science Center shall not be held liable for improper or incorrect use of the data described and/or contained herein
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: ARC/INFO (version Version 7.1) Size: 97 KB
      Network links: http://cmgds.marine.usgs.gov/data/walrus/
    • Availability in non-digital form:
      The map is no longer in print from the Geological Society of America (3300 Penrose Place, Boulder, CO 80301) but may be available at natural resource agency libraries that include literature on Alaska and/or Russia.
    • Cost to order the data: None, if obtained online.


Who wrote the metadata?

Dates:
Last modified: 14-Feb-2017
Metadata author:
Alaska Science Center, Marine and Fresh Water Ecology Branch
1011 E. Tudor Road
Anchorage, Alaska
USA

907-786-3512 (voice)
907-786-3636 (FAX)
Hours_of_Service: 8:00am to 4:00pm Monday through Friday
Contact_Instructions: None
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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