20220502
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1.0
TRUE
Aerial surveys of coastal Alaska are the primary method for estimating abundance of harbor seals. A particular challenge associated with aerial surveys of harbor <span style='background-color:rgb(255, 255, 255);'>seals is maintaining consistent spatial representation of haulout locations. In some cases, seals aggregate into a single large grouping at a particular area.</span> In other cases, seals aggregate into several smaller groups spread over a particular area. To establish geo-spatial consistency, the Alaska Fisheries Science Center developed coastal survey units (spatial polygons) throughout the distriubtion of harbor seals in Alaska. Each survey unit was designed to be approximately 10-15 kilometers in coastal length, to faciliate efficient aerial surveys, and to aggregate known harbor seal haulout locations. Each survey unit was assigned a unique alphanumeric identifier and the spatial data are provided in the geographic coordinate system WGS84 (epsg:4326). The survey units form the spatial foundation for estimation of harbor seal abundance and trend.<div><br /></div><div>Metadata can be accessed here:</div><div><a href='https://inport.nmfs.noaa.gov/inport/item/17349' target='_blank' rel='nofollow ugc noopener noreferrer'>https://inport.nmfs.noaa.gov/inport/item/17349</a><br /></div><div><br /></div><div><span style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>Data for download can be accessed from the ArcGIS Online NOAA Hub. This is the best place to for non-ArcGIS Online account holders to download data. Multiple formats are available:</span></div><div><a href='https://noaa.hub.arcgis.com/datasets/c63ccb17b9b144c4a529ee6a3d039665_0/explore?location=53.161599%2C17.104188%2C4.34' target='_blank' rel='nofollow ugc noopener noreferrer'>https://noaa.hub.arcgis.com/datasets/c63ccb17b9b144c4a529ee6a3d039665_0/explore?location=53.161599%2C17.104188%2C4.34</a></div><div><br /></div><div><br /></div>
aerial surveys
Alaska
harbor seal
survey units
This geospatial dataset describes the survey units used for coastal aerial surveys of harbor seals in Alaska.
National Oceanic and Atmospheric Administration, National Marine Fisheries, Alaska Fisheries Science Center
<span style='color: rgb(0, 0, 0); font-family: "Open Sans", Arial, sans-serif; background-color: rgb(255, 255, 255);'><font size='3'>User must read and fully comprehend the metadata prior to use. Applications or inferences derived from the data should be carefully considered for accuracy. While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. Acknowledge NOAA/NMFS/AFSC or the specified citation as the source from which these data were obtained in any publications and/or other representations of these data. Communication and collaboration with dataset authors is strongly encouraged.</font></span>
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