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:
XMin: 220839.014498994
YMin: 32942.6974269077
XMax: 412365.655066997
YMax: 219898.724760823
Spatial Reference: 103144 (6568)
Drawing Info:
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Has Geometry Properties: true
HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText
Object ID Field: OBJECTID
Unique ID Field:
IsSystemMaintained : True
Global ID Field:
Type ID Field:
Fields:
- OBJECTID (type: esriFieldTypeOID, alias: OBJECTID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
- hectares (type: esriFieldTypeDouble, alias: hectares, SQL Type: sqlTypeOther, nullable: true, editable: true)
- acres (type: esriFieldTypeDouble, alias: acres, SQL Type: sqlTypeOther, nullable: true, editable: true)
- habitat (type: esriFieldTypeString, alias: habitat, SQL Type: sqlTypeOther, length: 75, nullable: true, editable: true)
- g_truth_me (type: esriFieldTypeString, alias: g_truth_me, SQL Type: sqlTypeOther, length: 50, nullable: true, editable: true)
- site (type: esriFieldTypeString, alias: site, SQL Type: sqlTypeOther, length: 75, nullable: true, editable: true)
- g_truth_yr (type: esriFieldTypeSmallInteger, alias: g_truth_yr, SQL Type: sqlTypeOther, nullable: true, editable: true)
- Shape__Area (type: esriFieldTypeDouble, alias: Shape__Area, SQL Type: sqlTypeDouble, nullable: true, editable: false)
- Shape__Length (type: esriFieldTypeDouble, alias: Shape__Length, SQL Type: sqlTypeDouble, nullable: true, editable: false)
Templates:
Name: SAV 2021
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:
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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