View In:   ArcGIS Online Map Viewer

Name: SAV 2019

Display Field: BEDID

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The 2019 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 Belmont Bay portion of the Potomac River. 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.

Copyright Text: MD iMAP, DNR, VIMS

Default Visibility: true

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Extent:

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Spatial Reference: 102100  (3857)

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Type ID Field:

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID, editable: false, nullable: false, defaultValue: null, modelName: OBJECTID )
• QUADID ( type: esriFieldTypeInteger, alias: QUADID, editable: true, nullable: true, defaultValue: null, modelName: QUADID )
• BEDID ( type: esriFieldTypeString, alias: BEDID, editable: true, nullable: true, length: 2, defaultValue: null, modelName: BEDID )
• DENSITY ( type: esriFieldTypeInteger, alias: DENSITY, editable: true, nullable: true, defaultValue: null, modelName: DENSITY )
• BEDLABEL ( type: esriFieldTypeString, alias: BEDLABEL, editable: true, nullable: true, length: 6, defaultValue: null, modelName: BEDLABEL )
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Templates:

• Name: SAV 2019
  Description:
  Prototype:
  Surveyed: null
  ST: null
  QUADID: null
  BEDID: null
  DENSITY: null
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