Service Description: This geospatial dataset describes the survey units used for coastal aerial surveys of harbor seals in Alaska.

Service ItemId: c63ccb17b9b144c4a529ee6a3d039665

Has Versioned Data: false

Max Record Count: 2000

Supported query Formats: JSON

Supports applyEdits with GlobalIds: False

Supports Shared Templates: True

All Layers and Tables

Layers:

• geo_polys (0)

Description: Aerial surveys of coastal Alaska are the primary method for estimating abundance of harbor seals. A particular challenge associated with aerial surveys of harbor seals is maintaining consistent spatial representation of haulout 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 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.

Copyright Text: National Oceanic and Atmospheric Administration, National Marine Fisheries, Alaska Fisheries Science Center

Spatial Reference: 4326 (4326)

Initial Extent:

XMin: -317.359898647038
YMin: 38.8101697738982
XMax: 78.6396614860623
YMax: 127.576121229196
Spatial Reference: 4326 (4326)

Full Extent:

XMin: -179.15904861
YMin: 51.2067122300001
XMax: 179.789390596
YMax: 61.559265888
Spatial Reference: 4326 (4326)

Units: esriDecimalDegrees

Child Resources:   Info   SharedTemplates

Supported Operations:   Query   ConvertFormat   Get Estimates   Create Replica