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Layer: SAV 2021 (ID:0)

View In:   Map Viewer

Name: SAV 2021

Display Field: hectares

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description:

Zostera marina and Ruppia maritima (submerged aquatic vegetation) beds were delineated (polygons) using ortho-imagery collected in June, 2021. In order to maximize the identification of photo-signatures of SAV, the imagery was acquired using specifications from the NOAA Coastal Change Analysis Program including low tide, slight winds, low sun angle, full sun, and minimal humidity or haze. During the ortho creation process, solar glint was minimized by selecting flight lines with minimal glint. The delineation process was supplemented by geo-referenced underwater video recordings. To identify field survey locations, GPS enabled tablets were loaded with draft versions of the 2021 ortho-imagery and preliminary SAV delineations. After processing of field data, 999 acres of SAV were identified and delineated in coastal Rhode Island waters. To test the accuracy of the delineations, a user's and producer's matrix was developed (Story and Congalton, 1986). The overall user's accuracy for the 2021 SAV surveys was 83%.



Copyright Text: RI CRMC, URI-EDC, Narragansett Bay National Estuarine Research Reserve

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

Drawing Info:

HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

Unique ID Field:

Global ID Field:

Type ID Field:

Fields:
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Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 4/5/2022 5:56:24 PM

Schema Last Edit Date: 4/5/2022 5:56:24 PM

Data Last Edit Date: 4/5/2022 5:56:24 PM

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