Name: Tidal Marsh

Display Field: County

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The Virginia Institute of Marine Science published the first Tidal Marsh Inventories in Virginia using data collected in the early 1970's. In 2010, a new iteration of the Virginia Tidal Marsh Inventory began using high-resolution color imagery from the Virginia Base Map Program (VBMP) (2009, 2011, 2013, and 2017). Marsh boundaries were generated using heads-up digitizing techniques at a scale of 1:1,000. From 2010 through 2014 marsh polygons were classified by morphologic type: fringe, extensive, embayed, or marsh island. Beginning in 2015, morphologic classification was discontinued. Marshes were ground-truthed in the field where a community type index was assigned to each marsh based on plant community make-up.In 2023, a third iteration of the Virginia Tidal Marsh Inventory began in conjunction with the shoreline inventory update. This latest phase employs advanced remote sensing techniques, utilizing the most recent VBMP imagery and ESRI ArcGIS Pro software to map marsh boundaries (updated marsh extent and distribution). While historical plant community data was retained for existing marshes, newly identified marshes were initially classified as having an "undetermined" plant community type. This classification was only updated if high-resolution aerial imagery or drone-based photography provided conclusive evidence of the specific plant communities present.

Copyright Text: This project has been funded wholly or in part by The Virginia Department of Environmental Quality, Virginia Coastal Zone Management Program Grant # NA23NOS4190255.

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YMin: 4376592.164399996
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Spatial Reference: 102100  (3857)

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