Name: Seagrass Change Analysis

Display Field: ChangeType

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Description: The Maine Department of Environmental Protection (MEDEP), Bureau of Water Quality, Division of Environmental Assessment, Marine Vegetation Mapping Program produces regional seagrass distribution maps on an annual basis, and both MEDEP and the Maine Department of Marine Resources have historically mapped seagrass distribution. The change in seagrass coverage was assessed for extent only (i.e. percent cover changes were not included in the analysis) by comparing all existing seagrass coverage maps to identify the four extent change type categories: 1) Persistent Extent: Areas of seagrass presence in all surveys, recent and historical; 2) New Extent: Areas of seagrass presence in the most recent survey, but absence in all historical surveys; 3) Lost Extent: Areas of seagrass absence in the most recent survey, but presence in any historical survey; and 4) Dynamic Extent: Areas of seagrass presence in the most recent survey, but absence in some historical survey(s) (e.g., beds that have recovered from a previous loss, and beds that have established semi-recently but before the most recent survey). In areas where no recent Maine DEP seagrass surveys are available, no analysis was conducted.

Service Item Id: 384a01f3f29b4508a1293ff119b0d183

Copyright Text: The change analysis was conducted by the State of Maine Department of Environmental Protection (MEDEP) with datasets from the MEDEP and Maine Department of Marine Resources.

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• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• ChangeType ( type: esriFieldTypeString, alias: ChangeType, length: 255 )
• Acres ( type: esriFieldTypeDouble, alias: Acres )
• SurveyYearsAnalyzed ( type: esriFieldTypeString, alias: SurveyYearsAnalyzed, length: 255 )
• ChangeTypeDescription ( type: esriFieldTypeString, alias: ChangeTypeDescription, length: 255 )
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