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    • Gray Whale Survey Data

    Metadata Updated: October 11, 2025

    Gray whale calf production is estimated from data collected during the northbound migration as whales return to their feeding grounds in the Arctic. Counts of adult female whales with calves are made by observers and used to make the estimates.

    Gray whale abundance is estimated from data collected during the southbound migration from feeding grounds in the Arctic to breeding grounds in the lagoons of Mexico. Observers record counts of whales as they pass the long-term study site at Granite Canyon, California.

    Gray whale abundance is estimated from data collected during the southbound migration from feeding grounds in the Arctic to breeding grounds in the lagoons of Mexico. Counts of whales made from thermal imagery recorded during the migration are used to estimate abundance.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date September 29, 2025
    Metadata Created Date October 19, 2024
    Metadata Updated Date October 11, 2025
    Reference Date(s) 1990 (creation), (publication)
    Frequency Of Update annually

    Metadata Source

    Harvested from NMFS SWFSC

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date September 29, 2025
    Metadata Created Date October 19, 2024
    Metadata Updated Date October 11, 2025
    Reference Date(s) 1990 (creation), (publication)
    Responsible Party (Point of Contact, Custodian)
    Contact Email
    Guid gov.noaa.nmfs.inport:30820
    Access Constraints Cite As: Southwest Fisheries Science Center, [Date of Access]: Gray Whale Survey Data [Data Date Range], https://www.fisheries.noaa.gov/inport/item/30820., Access Constraints: FISMA controls are in place to protect stored data from unauthorized access and/or disclosure., Use Constraints: User must read and fully comprehend the metadata prior to use. Acknowledgement of NOAA SWFSC, as the source from which these data were obtained, in any publications and/or other representations of these data is requested. The user is responsible for the results of any application of these data for other than its intended purpose.
    Bbox East Long -121.16
    Bbox North Lat 35.7
    Bbox South Lat 35.6
    Bbox West Long -121.3
    Coupled Resource
    Frequency Of Update annually
    Harvest Object Id 1da5b9f9-a881-4646-a6a7-967294f42412
    Harvest Source Id bc62ff6c-c119-4409-94c7-7dd202b24462
    Harvest Source Title NMFS SWFSC
    Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
    Lineage The lineage and processing steps will be documented for data at the entity level.
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-121.3, 35.6], [-121.16, 35.6], [-121.16, 35.7], [-121.3, 35.7], [-121.3, 35.6]]]}
    Progress onGoing
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 1994

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