Service Description: This geospatial dataset describes observed haul-out locations used for coastal aerial surveys of harbor seals in Alaska.
Service ItemId: 2c6ca3e595024d3990127bfe061d7ed3
Has Versioned Data: false
Max Record Count: 4000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: True
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Description: Aerial surveys of coastal Alaska are the primary method for estimating abundance of harbor seals. A particular challenge associated with aerial survey s of harbor seals is maintaining consistent spatial representation of haul-out locations. In some cases, seals aggregate into a single large grouping at a particular area. In other cases, seals aggregate into several smaller groups spread over a particular area. To establish geo-spatial consistency, the Alaska Fisheries Science Center (AFSC) maintains a list of haul-out locations that represent known harbor seal aggregations in Alaska. Haul-out locations were identified through aerial survey efforts and historical knowledge. Locations are assigned a unique alphanumeric identifier, based on the survey unit they fall within, and the spatial data are provided in the geographic coordinate system WGS84 (epsg:4326). These haul-out locations are used to inform management decisions pertaining to coastal activities (presence/absence of seals in a particular area) and to facilitate AFSC field work that includes both aerial and vessel surveys. Haul-out locations are updated annually based on information obtained from aerial survey observations. This dataset contains Alaska harbor seal haul-out locations that are recorded primarily to support aerial survey efforts in August and (in some areas, June). Harbor seals are known to use various haul-out locations seasonally and, thus, this is likely not a complete collection of harbor seal haul-out locations. Some haul-outs that are close together may be combined and represented by as one site or waypoint. Important haul-out locations have been identified in the "status" field of the attribute table and are labeled as "key haulout" if a particular location contains 50 or more harbors seals. A haul-out location containing less than 50 harbor seals is labeled "not key haulout". This number may change as more in depth analysis continues.
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Data hosted on Socrata can be accessed here:
National Oceanic and Atmospheric Administration, National Marine Fisheries, Alaska Fisheries Science Center
Spatial Reference: 4326 (4326)
Initial Extent:
XMin: -67.3144341366933
YMin: 11.4441194887851
XMax: 327.371176452534
YMax: 99.915540360799
Spatial Reference: 4326 (4326)
Full Extent:
XMin: -179.07499999995
YMin: 51.2534999997252
XMax: 179.730100535312
YMax: 61.3945786004221
Spatial Reference: 4326 (4326)
Units: esriDecimalDegrees
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