Name: Recent Presence (2017-2021)

Display Field: MAP_INDEX

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: These data describe the extent of floating kelp beds (Nereocystis luetkeana and Macrocystis pyrifera) along the Strait of Juan de Fuca and outer coast of Washington State. Annual surveys describe conditions between 1989 and 2019. Data are derived from photo interpretation of low tide aerial photography in the late summer, the season of maximum extent. Polygons represent bed extent or planimeter, which include the kelp canopy floating on the surface and small gaps between plants (25 meter threshold for delineating discrete beds). These data are part of a long term monitoring effort that surveys the kelp canopies annually. The entire data set is comprised of the following components: yearly inventories (feature classes), excluding 1993 (kelpYYYY) a combined inventory from all years (kelp_all_years), a combined inventory of kelp observations from the five most recent years (kelp_recent_5yr), a spatial index delineating the geographic extent of monitoring sub-areas (map_index) and tabular data describing kelp characteristics for each year that link to the spatial index (summary_kelps_stats).It was necessary to generalize the polygons in kelp_all_years in order to produce a dataset that did not exceed the maximum number of vertices allowed for the feature class. Users who wish to use the most precise inventory estimates and compare area over multiple years should use the tabular summary tables which summarize area by map_index. The tabular estimates are more precise because they are based on the source imagery, while the area estimates in the feature classes reflect subsequent processing. Methods of subsequent processing have varied with changes in technology since 1989, resulting in noticeable differences among years in the spatial data that preclude detailed comparison of spatial data across years. Major methodological changes include: 1) a format change from vector (CAD) in 1989 to raster (20 m cell size) in 1994; 2) In 2010, the resolution changed from 20 meter to 4 meter resolution.

Service Item Id: f914128b696c4dcfbbe063972c7e63c9

Copyright Text: This dataset is primarily funded and managed by Washington State Department of Natural Resources, through the Nearshore Habitat Program. Other supporters and collaborators include: NOAA's Olympic Coast National Marine Sancutary, Washington State Department of Transportation, Washington State Department of Ecology's Coastal Zone Management Act, and Washington State Coastal Protection Fund.

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Supported Query Formats: JSON, geoJSON, PBF

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Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: true

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Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: 598705.5213958472
YMin: 877181.9550702572
XMax: 1115559.448315837
YMax: 1308280.2510084296
Spatial Reference: 2927  (2927)

Drawing Info:

Renderer:
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Labeling Info:

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HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• MAP_INDEX ( type: esriFieldTypeString, alias: MAP_INDEX, length: 30 )
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• Shape_Area ( type: esriFieldTypeDouble, alias: Shape_Area )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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