View In:   ArcGIS Online Map Viewer

Name: SAV 2020

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.

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

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Type ID Field:

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• 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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• Name: SAV 2020
  Description:
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