Name: 2020 SAV

Display Field: BEDID

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The 2020 Chesapeake Bay SAV Coverage was mapped from digital multispectral imagery with a 25cm GSD to assess water quality in the Bay. WorldView 2 satellite imagery acquired from Digital Globe through the NGA NextView program was used to augment the aerial imagery for the Susquehanna Flats; the Gunpowder River; the Eastern Neck area of the Chester River; Aquia Creek and a middle section of the Potomac River; Anacostia River and northernmost area of the Potomac River; the New Point Comfort area of Mobjack Bay; and Nassawadox Creek, Hungars Creek, and Mattawoman Creek. Each area of SAV was interpreted from the rectified imagry and classified into one of four density classes by the percentage of cover. The SAV beds were entered into an SDE GIS fetaure class using the quality control procedures documented below. The dataset contains all SAV areas that were identified from the areas flown. Some areas that are presumed to contain no SAV were not flown. Some small beds, particularly along narrow tributaries may not have been distinguishable on the aerial photography.

Definition Expression: N/A

Copyright Text: SAV Ecology, Monitoring, & Restoration Program, Virginia Institute of Marine Science

Default Visibility: false

MaxRecordCount: 1000

Supported Query Formats: JSON, AMF, geoJSON

Min Scale: 0

Max Scale: 0

Supports Advanced Queries: false

Supports Statistics: false

Has Labels: false

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: -8618874.64328462
YMin: 4420691.728756998
XMax: -8361142.154900034
YMax: 4810750.528778831
Spatial Reference: 102100  (3857)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: DENSITY
Field 2: null
Field 3: null
Field Delimiter: ,
Default Symbol:
N/A
Default Label: null
UniqueValueInfos:
• Value: 1
  Label: 0 - 10%
  Description:
  Symbol:
  Style: esriSFSSolid
  Color: [211, 255, 190, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 2
  Label: 10 - 40%
  Description:
  Symbol:
  Style: esriSFSSolid
  Color: [85, 255, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 3
  Label: 40 - 70%
  Description:
  Symbol:
  Style: esriSFSSolid
  Color: [56, 168, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 4
  Label: 70 - 100%
  Description:
  Symbol:
  Style: esriSFSSolid
  Color: [76, 115, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
Transparency: 0
Labeling Info:

Advanced Query Capabilities:

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

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• FID ( type: esriFieldTypeOID , alias: FID )
• Shape ( type: esriFieldTypeGeometry , alias: Shape )
• QUADID ( type: esriFieldTypeInteger , alias: QUADID )
• BEDID ( type: esriFieldTypeString , alias: BEDID , length: 2 )
• DENSITY ( type: esriFieldTypeInteger , alias: DENSITY )
• BEDLABEL ( type: esriFieldTypeString , alias: BEDLABEL , length: 6 )
• ZONE_ ( type: esriFieldTypeInteger , alias: ZONE_ )
• CBPSEG ( type: esriFieldTypeString , alias: CBPSEG , length: 6 )
• ST ( type: esriFieldTypeString , alias: ST , length: 2 )
• SHAPE_STAr ( type: esriFieldTypeDouble , alias: SHAPE_STAr )
• SHAPE_STLe ( type: esriFieldTypeDouble , alias: SHAPE_STLe )
• Surveyed ( type: esriFieldTypeString , alias: Surveyed , length: 3 )

Supported Operations:   Query   Generate Renderer   Return Updates

  Iteminfo   Thumbnail   Metadata