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Marine Mammals and Sea Turtles layers - Kemps Ridley Turtle, Atlantic Winter

US National Oceanic and Atmospheric Administration (NOAA)
  • Added 12 Sep 2016

The marine mammal and sea turtle layers in represent habitat-based density-model estimates of animal density. The marine mammal layers are a subset of a larger data set being delivered via the Cetacean and Sound Mapping website ( of the National Oceanic and Atmospheric Administration (NOAA).
The model results show estimates of the average number of animals present per square kilometer during a given season. Most of the average estimates of animals per km2 are less than 1 because marine mammals are highly mobile and often occur in large groups. For example, an average value of 0.5 bottlenose dolphins per km2 during the summer could mean that 1 animal would be present every other day, or 1 group of 5 animals would be present once in a 10 day period, or 1 group of 50 animals would be present every 100 days, etc.
These data originate largely from marine mammal observations generated through shipboard and aerial surveys conducted by NOAA’s National Marine Fisheries Service. Models explicitly incorporate environmental factors whenever possible. The model outputs were generated through a collaborative effort that included NOAA, the U.S. Navy, and Duke University. User agreements, source reports, and additional resources can be found below under Additional Information.

This layer is a component of Marine Mammals and Sea Turtles. themed service for public consumption featuring layers from the Marine Mammals and Turtle bin featured in the National Viewer.
This map service presents spatial information about services across the United States and Territories in the Web Mercator projection. The service was developed by the National Oceanic and Atmospheric Administration (NOAA), but may contain data and information from a variety of data sources, including non-NOAA data. NOAA provides the information “as-is” and shall incur no responsibility or liability as to the completeness or accuracy of this information. NOAA assumes no responsibility arising from the use of this information. The NOAA Office for Coastal Management will make every effort to provide continual access to this service but it may need to be taken down during routine IT maintenance or in case of an emergency. If you plan to ingest this service into your own application and would like to be informed about planned and unplanned service outages or changes to existing services, please register for our Data Services Newsletter ( For additional information, please contact the NOAA Office for Coastal Management (



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RegionsDelaware, Massachusetts, New Jersey, Rhode Island

Technical Details

Layer ID 20648
Data type Vector multipolygon
Feature count 1069
Attributes chl, Area, season, Study, density, lon, BegDate, depth, sst, lat, EndDate, species, Stock
Services Vector Query API


Added 12 Sep 2016 ago
Last checked 1 Sep 2018 ago
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