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Harmful Algal Blooms

Metadata Updated: March 15, 2024

Multiple Harmful Algae Bloom (HAB) (K. brevis) data sets were obtained for this data layer, including Harmful Algal BloomS Observing System data (HABSOS) from NCEI (1953-2018) and the NOAA HAB Operational Forecast System Dataset (2007-2018). Data includes samples from Texas Parks and Wildlife Department (TPWD) the Louisiana Department of Health and Hospitals, Florida Fish and Wildlife Conservation Commission, Florida Fish and Wildlife Research Institute (FWRI), and the HAB Monitoring Database. Data were combined and reviewed for erroneous entries. Duplicate data from the resulting database were deleted, leaving a total of 155,307 observations. For the purpose of this K. brevis layer, only data from 2000-2018 were used due to sampling biases. An 8 square kilometer hexagonal grid was created covering the Gulf of Mexico and eastern Florida. Each year between 2000-2018 was evaluated separately. If a grid cell contained an observation that registered a value of over 100,000 cells/L (the lethal toxicity level for finfish), the grid cell received a value of '1‘. All other grid cells received a value of '0’ to represent observations below the lethal level of concern to fish. After all years were evaluated, the values for each year were totaled to obtain a resulting frequency value for that grid cell, representing the number of years that grid cell had values greater than or equal to 100,000 cells/L for the years 2000-2018.

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


Metadata Date February 29, 2024
Metadata Created Date January 24, 2022
Metadata Updated Date March 15, 2024
Reference Date(s) October 25, 2019 (publication)
Frequency Of Update annually

Metadata Source

Harvested from NOS OCM

Additional Metadata

Resource Type Dataset
Metadata Date February 29, 2024
Metadata Created Date January 24, 2022
Metadata Updated Date March 15, 2024
Reference Date(s) October 25, 2019 (publication)
Responsible Party Office for Coastal Management (Resource Provider)
Contact Email
Guid gov.noaa.nmfs.inport:66143
Access Constraints Cite As: Office for Coastal Management, [Date of Access]: Harmful Algal Blooms [Data Date Range],, Use Constraints: For coastal and ocean planning, Distribution Liability:
Bbox East Long -79.909497
Bbox North Lat 31.173994
Bbox South Lat 23.999996
Bbox West Long -97.522273
Coupled Resource
Frequency Of Update annually
Harvest Object Id 704812bc-1a7c-4a8d-a0b0-ea494510164f
Harvest Source Id c0121fd9-df15-4168-ac04-42f6e36a794d
Harvest Source Title NOS OCM
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.
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-97.522273, 23.999996], [-79.909497, 23.999996], [-79.909497, 31.173994], [-97.522273, 31.173994], [-97.522273, 23.999996]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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