View In:   ArcGIS Online Map Viewer

Name: MaxentModeledSeagrassExtent

Display Field: objectid_1

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Existing seagrass distribution datasets still suffer from known spatial gaps in knowledge, for instance, the north east Pacific, the coastal area of Scandinavia and the Northern African coast, are at best characterised by point occurrence records, whilst extensive meadows are known to occur. Point occurrence datasets cannot be used in area surface calculations as they do not indicate the spatial extent of seagrass beds. In the absence of in-situ mapping of seagrass extent at a global scale, existing occurrence data can be used in species distribution models to map the biome in unsurveyed areas, and indeed some regional attempts have been made. This polygon layer is a result of a MaxEnt model of the global distribution of seagrass using all available point records.Creation methodology:Species occurrence records were extracted from the Global Biodiversity Information Facility (GBIF), United Nations Environment Programme-World Conservation Monitoring Centre (UNEP-WCMC) Ocean Data Viewer and Ocean biogeographic information system (OBIS). After data cleaning, 39045 occurrence records (combining all seagrass species) were used in species distribution model. 13 environmental variables from Global Marine Environment Datasets (GMED) were interpolated into 30 arc seconds resolution (1 km at the equator) and used in species distribution models. MaxEnt models were generated using 10 cross-validate replicate runs with parameters: convergence threshold = 10-5, regularization multiplier = 1, maximum number of background points = 10,000 and maximum iterations = 1000. The methodology is fully described in the paper Jayathilake and Costello (2018).

Service Item Id: 27ed2e39eabb4d538270ef2272602ff8

Copyright Text: Jayathilake D.R.M., Costello M.J. 2018. A modelled global distribution of the seagrass biome. Biological Conservation. https://doi.org/10.1016/j.biocon.2018.07.009

Default Visibility: true

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0

Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports ValidateSQL: true

Supports Calculate: true

Extent:

XMin: -2.00375070672E7
YMin: -4374311.5153
XMax: 2.0037507067199998E7
YMax: 5961651.728800001
Spatial Reference: 54034  (54034)

Drawing Info:

Renderer:
Simple Renderer:
Symbol:
Style: esriSFSSolid
Color: [34, 136, 51, 255]
Outline:
Style: esriSLSSolid
Color: [34, 136, 51, 255]
Width: 2
Label: N/A
Description: N/A
Transparency: 0
Labeling Info:

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: false
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: true
Supports Returning Geometry Centroid: false
Supports Binning LOD: true
Supports Query With LOD Spatial Reference: true

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field:

Fields:

• fid ( nullable: false, defaultValue: null, editable: false, length: 4, type: esriFieldTypeOID, modelName: fid, alias: fid )
• objectid_1 ( modelName: objectid_1, nullable: true, editable: true, defaultValue: null, alias: OBJECTID_1, type: esriFieldTypeInteger )
• objectid ( modelName: objectid, nullable: true, editable: true, defaultValue: null, alias: OBJECTID, type: esriFieldTypeInteger )
• id ( modelName: id, nullable: true, editable: true, defaultValue: null, alias: Id, type: esriFieldTypeInteger )
• gridcode ( modelName: gridcode, nullable: true, editable: true, defaultValue: null, alias: gridcode, type: esriFieldTypeInteger )
• shape_leng ( modelName: shape_leng, nullable: true, editable: true, defaultValue: null, alias: Shape_Leng, type: esriFieldTypeDouble )
• shape_le_1 ( modelName: shape_le_1, nullable: true, editable: true, defaultValue: null, alias: Shape_Le_1, type: esriFieldTypeDouble )
• SHAPE__Length ( virtual: true, nullable: true, editable: false, defaultValue: null, alias: SHAPE__Length, type: esriFieldTypeDouble )
• SHAPE__Area ( virtual: true, nullable: true, editable: false, defaultValue: null, alias: SHAPE__Area, type: esriFieldTypeDouble )

Templates:

• Name: MaxentModeledSeagrassExtent
  Description:
  Prototype:
  shape_le_1: null
  id: null
  objectid_1: null
  shape_leng: null
  objectid: null
  gridcode: null
  
  Drawing Tool: esriFeatureEditToolPolygon

Capabilities: Query

Sync Can Return Changes: true

Is Data Versioned: false

Supports Rollback On Failure: true

Supports ApplyEdits With Global Ids: false

Supports ApplyEdits By Upload Id: true

Supports Query With Historic Moment: false

Supports Coordinates Quantization: true

Supported Operations:   Query   Query Attachments   Calculate   Validate SQL   Generate Renderer   Return Updates   Metadata