Name: Zebra_Mussels_Distribution_Concave_Hull

Display Field:

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Zebra Mussel observations from the U.S. Geological Survey Nonindigenous Aquatic Species Database were used to create a concave hull for each year of observations to cumulatively show the extent of their distribution.<div><br /></div><div>These polygons were further smoothed for visualization purposes.</div>

Copyright Text: U.S. Geological Survey, 2023, Specimen observation data for Dreissena polymorpha (Pallas, 1771), Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/viewer/omap.aspx?SpeciesID=5, Access Date: 10/24/2023.

Min. Scale: 0

Max. Scale: 9244648

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

XMin: -12242530.825108
YMin: 3335342.45798267
XMax: -7570550.24547798
YMax: 7040082.32288039
Spatial Reference: 102100 (3857)

Drawing Info:

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HasZ: false

HasM: false

Time Info:

Start Time Field: Date
End Time Field: null
Track ID Field: null
Time Extent
[1/1/1989 12:00:00 AM UTC, 1/1/2023 12:00:00 AM UTC]

Time Reference: UTC
Time Interval: 0
Time Interval Units:
Has Live Data: false
Export Options:

Use Time: false
Time Data Cumulative: false
Time Offset: 0
Time Offset Units: esriTimeUnitsCenturies

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeNone

Object ID Field: OBJECTID

Unique ID Field:

Name : OBJECTID

IsSystemMaintained : True

Global ID Field:

Type ID Field:

Fields:

• OBJECTID (type: esriFieldTypeOID, alias: OBJECTID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
• Year (type: esriFieldTypeDouble, alias: Year, SQL Type: sqlTypeOther, nullable: true, editable: true)
• Date (type: esriFieldTypeDate, alias: Date, SQL Type: sqlTypeOther, length: 8, nullable: true, editable: true)
• InPoly_FID (type: esriFieldTypeInteger, alias: InPoly_FID, 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: New Feature
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Attributes:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 5/21/2025 3:55:01 PM

Schema Last Edit Date: 5/21/2025 3:55:01 PM

Data Last Edit Date: 5/21/2025 3:54:30 PM

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