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ISO19115_3
dataset
20260713
ArcGIS Metadata
1.0
Post-Sackett Virginia and Border-State Wetland Connectivity Assessment Scenarios (2026)
2026-07-10T00:00:00
2026-04-08T00:00:00
vector digital data
PostSackett_Virginia_and_Bordering_Vegetated_Wetlands_Scenarios_2026_Final
Center for Coastal Resources Management
Virginia Institute of Marine Science, P.O. Box 1346, 1375 Greate Rd
Gloucester Point
Virginia
23062
US
Nunez, K., Havens, K.J., Rudnicky, T., Schatt, D., Graulich, J (2026). GIS Data – Post-Sackett Virginia and Border-State Wetland Connectivity Assessment Scenarios. Center for Coastal Resources Management, Virginia Institute of Marine Science, William & Mary.
This is a scenario-based analysis to identify vegetated wetlands in Virginia and on the borders of neighboring states that may remain classified as jurisdictional wetlands following the 2023 U.S. Supreme Court decision in Sackett v. Environmental Protection Agency.
Kentucky
Virginia
West Virginia
Tennessee
North Carolina
Maryland
ISO 19115 Topic Categories
environment
geoscientificInformation
inlandWaters
wetland management
National Wetlands Inventory
NWI
Coastal waters
Wetlands
Hydrography
Surface water
Tidal Marsh Inventory
Post-Sackett
environment
geoscientificInformation
inlandWaters
USFWS
National Wetlands Inventory
NWI
Wetlands
Hydrography
marshes
Surface water
Kentucky
Virginia
West Virginia
Tennessee
North Carolina
Maryland
Tidal Marsh Inventory
wetland management
Although NWI data have been processed successfully on a computer system at the U.S. Fish and Wildlife Service, no warranty expressed or implied is made by the U.S. Fish and Wildlife Service regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Fish and Wildlife Service in the use of these data.
Wetlands and Deepwater Habitats of the United States
Version 2 - Surface Waters and Wetlands
U.S. Fish and Wildlife Serivce, National Wetlands Inventory
U.S. Fish and Wildlife Service
Washington, D.C. USA
Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9273
1
-83.648194
-75.237623
39.450660
36.500161
0.000000
0.000000
The dataset encompasses the Commonwealth of Virginia and adjoining areas of Maryland, West Virginia, Tennessee, and North Carolina. The extent extends beyond the Virginia boundary where necessary to preserve the continuity of wetlands, perennial waters, and associated hydrologic connections used in the wetland analysis.
This project has been funded wholly or in part by the U.S. Environmental Protection Agency Grant # CD-95340501 and the Virginia Department of Environmental Quality (VA DEQ) Project # 66466.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This was an effort to determine total area of vegetated wetlands within Virginia and on the borders of Virginia and its neighboring states that would remain under federal jurisdiction following the 2023 U.S. Supreme Court decision in Sackett v. Environmental Protection Agency. Because the precise classification scheme defining what wetlands are classified as jurisdictional is not yet certain, it was determined that the best approach was to perform the analysis under multiple scenarios. Three different scenarios were considered: scenario 1 assumes the most conservative classification scheme and would result in the least wetland area under federal jurisdiction; Scenario 2 is more inclusive and would include all Scenario 1 wetlands plus additional wetlands under federal jurisdiction; Scenario 3 is the most inclusive and would include all wetlands under Scenarios 1 and 2 plus additional wetlands under federal jurisdiction. The analysis separately considers wetlands on the borders of Virginia and its neighboring states because there may be jurisdictional uncertainty associated with such wetlands.</SPAN></P></DIV></DIV></DIV>
Karinna Nunez
Virginia Institute of Marine Science
Geospatial Modeling Manager
Virginia Institute of Marine Science, P.O. Box 1346, 1375 Greate Rd
Gloucester Point
Virginia
23062
karinna@vims.edu
US
(804) 684-7273
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Center for Coastal Resources Management (CCRM) provides these data with the understanding that it is not guaranteed to be correct or complete, and conclusions drawn from the data set are the sole responsibility of the user. Every attempt has been made to ensure that these data and the documentation are reliable and accurate. Neither CCRM nor the Virginia Institute of Marine Science (VIMS) assume liability for any damages caused by inaccuracies in the data or documentation or as a result of failure of the data to perform in a particular manner. CCRM, VIMS, the Commonwealth, and the Virginia Department of Environmental Quality (VA DEQ) make no warranty, express or implied, as to the accuracy, completeness, or utility of this information, nor does the fact of distribution constitute a warranty.</SPAN></P></DIV></DIV></DIV>
None
None
Polygon and chain-node topology are present. Every polygon has a label.
This data set represents the extent of vegetated National Wetlands Inventory (NWI) wetlands and Virginia Tidal Marsh Inventory (TMI) wetlands that can be determined with the use of remotely sensed data and within the timeframe for which the data were produced. Wetlands are shown in all of the Commonwealth of Virginia and adjacent portions of Maryland, West Virginia, Tennessee, and North Carolina where wetlands extend across the Virginia state boundary. The accuracy of image interpretation depends on the quality and date of the imagery, the experience of the image analysts, the amount and quality of the collateral data, and the amount of ground truth verification work conducted. There is a margin error inherent in the use of imagery, thus detailed on-the-ground inspection of any particular site, may result in revision of the wetland boundaries or classification, established through image analysis. Wetlands or other mapped features may have changed since the date or the imagery and/or field work. There may be occasional differences in polygon boundaries or classifications between the information depicted on the map and the actual conditions on site.
A unified vegetated wetlands layer was created by combining the U.S. Fish and Wildlife Service National Wetlands Inventory (NWI) with the Virginia Tidal Marsh Inventory (TMI). NWI polygons were enhanced by joining descriptive wetland classification and hydrologic attributes. Overlapping NWI tidal wetlands were then replaced with TMI tidal marsh polygons to eliminate duplicate representations and improve the accuracy of coastal wetland mapping.
The combined dataset was filtered to retain vegetated wetland classes most relevant to federal wetland jurisdiction analyses. Selected wetland types included emergent, scrub-shrub, and forested wetlands within palustrine, lacustrine, riverine, and selected estuarine systems. Wetland classes representing predominantly open-water habitats were excluded from the vegetated wetlands layer and were instead incorporated into the hydrologic connectivity analysis.
The resulting unified vegetated wetlands layer served as the primary wetland dataset used in all subsequent WetCAT scenario analyses.
A perennial waters network was developed to represent relatively permanent waters and evaluate hydrologic connectivity between vegetated wetlands and downstream jurisdictional waters. The network was constructed using NHDPlus flowlines, NHDPlus waterbody polygons, NHDPlus hydrographic areas, and selected National Wetlands Inventory (NWI) open-water features. Perennial streams, rivers, lakes, reservoirs, estuaries, and tidal waters were incorporated into the network.
Connector flowlines, canals, ditches, and artificial flow paths were evaluated to determine whether they maintained hydrologic continuity between perennial water features. Connector flowlines were retained where they linked perennial waters and preserved downstream connectivity. Canal and ditch features were evaluated using land-cover characteristics, wetland associations, proximity to roads, and proposed federal guidance regarding jurisdictional ditches. Ditches constructed entirely within uplands and lacking wetland associations were excluded from the network. Tidal ditches, navigable canals, and ditches constructed within wetlands were retained where available evidence indicated hydrologic connectivity to perennial waters.
Selected flowline and polygon features were merged to create a continuous perennial waters network. Downstream connectivity to traditional navigable waters and other jurisdictional waters was evaluated throughout the network, and locations where connectivity appeared to be interrupted due to hydrographic mapping limitations were manually reviewed and corrected where appropriate.
Two versions of the perennial waters network were created to represent conservative and expanded assumptions regarding connectivity through artificial flow paths, providing a bounded range of potential hydrologic connectivity for subsequent wetland analyses.
Three wetland connectivity scenarios were developed to evaluate potential variation in federal wetland jurisdiction under post-Sackett v. EPA interpretations of the continuous surface connection standard. Each scenario was based on progressively broader assumptions regarding hydrologic connectivity between vegetated wetlands and the perennial waters network.
National Wetlands Inventory (NWI) water-regime modifiers were used to characterize the frequency and duration of inundation or soil saturation for each wetland polygon. Wetlands were classified into connectivity scenarios according to their assigned water-regime modifiers.
Scenario 1 – Conservative Connectivity retained individual wetland polygons without dissolving adjacent wetlands into larger wetland complexes. Wetlands were identified as potentially jurisdictional only where they directly abutted the perennial waters network and were assigned one of the following NWI water-regime modifiers: C (Seasonally Flooded), F (Semi-permanently Flooded), G (Intermittently Exposed), H (Permanently Flooded), N (Regularly Flooded–Saltwater Tidal), Q (Regularly Flooded–Freshwater Tidal), T (Semi-permanently Flooded–Tidal), or V (Permanently Flooded–Tidal).
Scenario 2 – Expanded Seasonal Connectivity included all wetlands identified in Scenario 1 and added wetlands assigned the following NWI water-regime modifiers: E (Seasonally Flooded/Saturated), M (Irregularly Exposed–Saltwater Tidal), and R (Seasonally Flooded–Freshwater Tidal). These additional wetlands represent systems that may maintain seasonal surface-water connections to adjacent perennial waters.
Scenario 3 – Inclusive Connectivity included all wetlands identified in Scenarios 1 and 2 and added wetlands assigned the D (Continuously Saturated) water-regime modifier. These wetlands represent areas characterized primarily by prolonged soil saturation rather than persistent surface inundation.
The three scenario outputs represent conservative, intermediate, and inclusive estimates of wetlands that may satisfy the continuous surface connection criterion and were used as alternative jurisdictional interpretations in subsequent wetland analyses.
National Wetlands Inventory (NWI) from the US Fish and Wildlife Services: This is the primary non-tidal wetlands layer utilized in the analysis. Virginia was downloaded in January 2024. Kentucky, Maryland, North Carolina, Tennessee, and West Virginia were downloaded in October 2025. (As noted in the NWI metadata: Federal, state, and local regulatory agencies with jurisdiction over wetlands may define and describe wetlands in a different manner than that used in this inventory. There is no attempt, in either the design or products of this inventory, to define the limits of proprietary jurisdiction of any Federal, state, or local government or to establish the geographical scope of the regulatory programs of government agencies).
Wetlands and Deepwater Habitats of the United States
Wetlands and Deepwater Habitats of the United States
U.S. Fish and Wildlife Service
U.S. Fish and Wildlife Service
Washington, D.C.
National Wetlands Inventory Maps
https://www.fws.gov/program/national-wetlands-inventory/download-state-wetlands-data
ground condition
1977-01-01T00:00:00
National Hydrography Dataset (NHD) Plus High Resolution from the US EPA and US Geological Survey: Published 2018. Downloaded August 2022. Utilizes high resolution (1:24,000 scale) NHD data.
https://www.usgs.gov/national-hydrography/nhdplus-high-resolution
Virginia Tidal Marsh Inventory (TMI) from the Center for Coastal Resources Management (CCRM). This layer is a combination of updated tidal marsh for 10 localities published in 2024 and 2025 (Hampton, Northumberland, Poquoson, Virginia Beach, Westmoreland, Gloucester, Lancaster, Mathews, Middlesex, and York), and older tidal marsh digitized between 2010 and 2019. Newer marshes were digitized referencing high resolution 2021 Virginia Basemap Imagery (VBMP). Older marshes were digitized using high resolution color infra-red imagery from 2009, 2011, 2013 and 2017. The TMI layer provides a more accurate representation of Virginia’s jurisdictional tidal marshes than the NWI layer and thus will replace most of the tidal NWI in Virginia.
Virginia Tidal Water Interface Shoreline from the Center for Coastal Resources Management (CCRM) digitized between 2010 and 2025 using high resolution color infra-red VBMP imagery from 2009, 2011, 2013, 2017, and 2021.
NLCD 2024 Annual Land Cover 30m cell size - downloaded October 2025
North Carolina Coastal Wetlands from North Carolina Division of Coastal Management (DCM), published in 1999.
Maryland Salt Marsh - In coastal Maryland, these data were derived from mapping efforts by the Maryland Department of Natural Resources (MD DNR), using Maryland's Digital Orthophoto Quarter Quads, based on aerial photography conducted between 1988 and 1995. Data published Dec 2009.
425156
EPSG
6.18.3(9.3.1.2)
PostSackett_Virginia_and_Bordering_Vegetated_Wetlands_Scenarios_2026_Final
Feature Class
425156
Polygon feature class representing the spatial extent of wetlands within the project area.
Project documentation
SHAPE
Feature geometry.
ESRI
Coordinates defining the features.
Shape
Geometry
0
0
0
OBJECTID
Internal feature number.
ESRI
Polygon
2-dimensional element.
ESRI GIS software
Sequential unique whole numbers that are automatically generated.
OBJECTID
OID
4
0
0
SHAPE_Length
Length of feature in internal units.
ESRI
Positive real numbers that are automatically generated.
Shape_Length
Double
8
0
0
SHAPE_Area
Area of feature in internal units squared.
ESRI
Positive real numbers that are automatically generated.
Shape_Area
Double
8
0
0
FGDC_METADATA
FGDC_METADATA
String
100
0
0
A metadata link provided by NWI. This link provides a description of the NWI project that mapped the wetland polygon. This only applies the polygons obtained from the National Wetlands Inventory.
user defined
IMAGE_YR
IMAGE_YR
SmallInteger
2
0
0
The year of the imagery used by NWI to map the wetland polygon.
user defined
IMAGE_DATE
IMAGE_DATE
String
40
0
0
The month and year of the imagery used by NWI to map the wetland polygon.
user defined
State
State
String
255
0
0
The name of the state or Commonwealth in which the wetland is located. States represented in this feature class are Kentucky, Maryland, North Carolina, Tennessee, Virginia, and West Virginia.
user defined
VaPlusAllNWI_ID
VaPlusAllNWI_ID
String
255
0
0
An ID used in some of the wetland analysis processing steps.
user defined
SYSTEM
SYSTEM
String
1
0
0
SYSTEM_NAME
SYSTEM_NAME
String
50
0
0
Name assigned to a complex of wetlands and deepwater habitats that share the influence of similar hydrologic, geomorphologic, chemical or biological factors.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
SYSTEM_DEFINITION
SYSTEM_DEFINITION
String
1000
0
0
Definition of the System - a complex of wetlands and deepwater habitats that share the influence of similar hydrologic, geomorphologic, chemical or biological factors.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
SUBSYSTEM
SUBSYSTEM
String
1
0
0
SUBSYSTEM_NAME
SUBSYSTEM_NAME
String
50
0
0
Name assigned to subdivide System designations into more specific categories.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
SUBSYSTEM_DEFINITION
SUBSYSTEM_DEFINITION
String
1000
0
0
Definitions in terms of water permanence, gradient, substrate, and the extent of floodplain development, or tidal influence.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
CLASS
CLASS
String
2
0
0
CLASS_NAME
CLASS_NAME
String
50
0
0
The highest taxonomic unit below the Subsystem level, usually describing either the dominant life form of the vegetation or the physiography and composition of the substrate.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
CLASS_DEFINITION
CLASS_DEFINITION
String
1000
0
0
Describes the general appearance of the habitat in terms of either the dominant life form of the vegetation, or the physiography and composition of the substrate.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
SUBCLASS
SUBCLASS
String
1
0
0
SUBCLASS_NAME
SUBCLASS_NAME
String
50
0
0
Name assigned to further define life forms or substrate type.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
SUBCLASS_DEFINITION
SUBCLASS_DEFINITION
String
1000
0
0
Definition assigned to define the specific life form, or substrate with the greatest areal coverage present.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
SPLIT_CLASS
SPLIT_CLASS
String
2
0
0
SPLIT_CLASS_NAME
SPLIT_CLASS_NAME
String
50
0
0
Name assigned to a wetland that contains two equally distinct cover (class) types.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
SPLIT_CLASS_DEFINITION
SPLIT_CLASS_DEFINITION
String
1000
0
0
Used when a wetland contains two equally distinct cover types (classes) that each encompasses at least 30% areal coverage. This split class definition is used to describe the second class of either the wetlands dominant life form of the vegetation or the physiography and composition of the substrate.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
SPLIT_SUBCLASS
SPLIT_SUBCLASS
String
1
0
0
SPLIT_SUBCLASS_NAME
SPLIT_SUBCLASS_NAME
String
50
0
0
Name assigned to a wetland that contains two equally distinct life forms or substrates (subclasses).
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
SPLIT_SUBCLASS_DEFINITION
SPLIT_SUBCLASS_DEFINITION
String
1000
0
0
Used when a wetland contains two equally distinct life forms or substrates (subclass). This split subclass definition is used to describe the second subclass of either the wetlands distinct life form or substrate.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
WATER_REGIME
WATER_REGIME
String
1
0
0
WATER_REGIME_NAME
WATER_REGIME_NAME
String
50
0
0
Name assigned to add description to wetlands and deepwater habitats to indicate duration of flooding or saturation.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
WATER_REGIME_SUBGROUP
WATER_REGIME_SUBGROUP
String
50
0
0
Applied to define whether a wetlands hydrologic characteristics are controlled by groundwater, nontidal flooding, freshwater tidal or saltwater tidal factors.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
WATER_REGIME_DEFINITION
WATER_REGIME_DEFINITION
String
1000
0
0
Description of water duration within a wetland habitat.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
MODIFIER1
MODIFIER1
String
1
0
0
MODIFIER1_NAME
MODIFIER1_NAME
String
50
0
0
Modifier name is assigned to further describe wetlands and deepwater habitats within the classification hierarchy.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
MODIFIER1_GROUP
MODIFIER1_GROUP
String
50
0
0
Modifier assigned to further describe wetlands and deepwater habitats within the classification hierarchy.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
MODIFIER1_SUBGROUP
MODIFIER1_SUBGROUP
String
50
0
0
The type of first modifier applied; which include special modifier, water chemistry or soil.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
MODIFIER1_DEFINITION
MODIFIER1_DEFINITION
String
1000
0
0
Modifier assigned to further describe wetlands and deepwater habitats within the classification hierarchy based on water chemistry or pH, wetland or deepwater alteration, or soil type.
Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC.
Category
wetlandCategory
String
255
0
0
A quick classification of wetlands into Tidal or Nontidal categories. This is not a definitive classification as water regimes may not have been considered in this classification. This is not a field from NWI.
user defined
County
County
String
254
0
0
Name of Virginia locality in which the wetland exists. This is a field from the TMI dataset.
processor
PubYear
PubYear
String
50
0
0
Year the Tidal Marsh Inventory data was published. Date differs for each locality.
processor
nwiORtmi
nwiORtmi
String
255
0
0
This field indicates the origin of the wetland (NWI or TMI)
user defined
NWI
Wetland is from the National Wetlands Inventory (NWI)
user defined
TMI
Wetland is from the Virginia Tidal Marsh Inventory (TMI)
user defined
anotherID
anotherID
Integer
4
0
0
An identification number used in the processing of this dataset.
processor
acres_LLC
acres_LLC
Double
8
0
0
Area in acres of the wetland polygon determined by using the ArcGIS Pro tool Calculate Geometry with the NAD_1983_Lambert_Conformal_Conic Coordinate System parameter.
processor
NC_WET_NAME
NC_WET_NAME
String
40
0
0
North Carolina Wetland Name
North Carolina Coastal Wetlands from North Carolina Division of Coastal Management (DCM), published in 1999
Estuarine Shrub/Scrub
Any shrub/scrub dominated community subject to occasional flooding by tides, including wind tides (whether or not the tide
NC-CREWS: North Carolina Coastal Region Evaluation of Wetland Significance. 1999
Salt/Brackish Marsh
Any salt marsh or other marsh subject to regular or occasional flooding by tides, including wind tides (whether or not the tide
NC-CREWS: North Carolina Coastal Region Evaluation of Wetland Significance. 1999
NC_WtlndTypeDef
NC_WtlndTypeDef
String
750
0
0
Definition of North Carolina wetland type
NC-CREWS: North Carolina Coastal Region Evaluation of Wetland Significance. 1999
OverlapWithMD_SaltMarsh
OverlapWithMD_SaltMarsh
String
10
0
0
Indicates if the NWI polygon overlaps with the Maryland Salt Marsh polygons.
processor
scenario_1
scenario_1
String
255
0
0
Conservative Connectivity retained individual wetland polygons without dissolving adjacent wetlands into larger wetland complexes. Wetlands were identified as potentially jurisdictional only where they directly abutted the perennial waters network and were assigned one of the following NWI water-regime modifiers: C (Seasonally Flooded), F (Semi-permanently Flooded), G (Intermittently Exposed), H (Permanently Flooded), N (Regularly Flooded–Saltwater Tidal), Q (Regularly Flooded–Freshwater Tidal), T (Semi-permanently Flooded–Tidal), or V (Permanently Flooded–Tidal).
Post Sackett Wetland Scenarios documentation - 2026
Jurisdictional
Wetland intersects or is within 0.5m of perennial waters with a continuous surface connection and meets the Scenario 1 criteria.
Post Sackett Wetland Scenarios documentation - 2026
Non-jurisdictional
Wetland does not intersect/abut adjacent perennial waters with a continuous surface connection and does not meet the Scenario criteria.
Post Sackett Wetland Scenarios documentation - 2026
scenario_1_max
scenario_1_max
String
255
0
0
Conservative Connectivity retained individual wetland polygons without dissolving adjacent wetlands into larger wetland complexes. Wetlands were identified as potentially jurisdictional only where they directly abutted the perennial waters network and were assigned one of the following NWI water-regime modifiers: C (Seasonally Flooded), F (Semi-permanently Flooded), G (Intermittently Exposed), H (Permanently Flooded), N (Regularly Flooded–Saltwater Tidal), Q (Regularly Flooded–Freshwater Tidal), T (Semi-permanently Flooded–Tidal), or V (Permanently Flooded–Tidal).
This scenario includes more wetlands by expanding assumptions regarding artificial flow-path connectivity
Post Sackett Wetland Scenarios documentation - 2026
Jurisdictional
Wetland intersects or is within 0.5m of perennial waters with a continuous surface connection and meets the maximum Scenario 1 criteria.
Post Sackett Wetland Scenarios documentation - 2026
Non-jurisdictional
Wetland does not intersect/abut adjacent perennial waters with a continuous surface connection and does not meet the maximum Scenario 1 criteria.
Post Sackett Wetland Scenarios documentation - 2026
scenario_2
scenario_2
String
255
0
0
Expanded Seasonal Connectivity included all wetlands identified in Scenario 1 and added wetlands assigned the following NWI water-regime modifiers: E (Seasonally Flooded/Saturated), M (Irregularly Exposed–Saltwater Tidal), and R (Seasonally Flooded–Freshwater Tidal). These additional wetlands represent systems that may maintain seasonal surface-water connections to adjacent perennial waters.
Post Sackett Wetland Scenarios documentation - 2026
Jurisdictional
Wetland intersects or is within 0.5m of jurisdictional waters and meets the Scenario 2 criteria.
Post Sackett Wetland Scenarios documentation - 2026
Non-jurisdictional
Wetland does not intersect/abut adjacent perennial waters with a continuous surface connection and does not meet the Scenario 2 criteria.
Post Sackett Wetland Scenarios documentation - 2026
scenario_2_max
scenario_2_max
String
255
0
0
Expanded Seasonal Connectivity included all wetlands identified in Scenario 1 and added wetlands assigned the following NWI water-regime modifiers: E (Seasonally Flooded/Saturated), M (Irregularly Exposed–Saltwater Tidal), and R (Seasonally Flooded–Freshwater Tidal). These additional wetlands represent systems that may maintain seasonal surface-water connections to adjacent perennial waters.
This scenario includes more wetlands by expanding assumptions regarding artificial flow-path connectivity.
Post Sackett Wetland Scenarios documentation - 2026
Jurisdictional
Wetland intersects or is within 0.5m of jurisdictional waters and meets the maximum Scenario 2 criteria
Post Sackett Wetland Scenarios documentation - 2026
Non-jurisdictional
Wetland does not intersect/abut adjacent perennial waters with a continuous surface connection and does not meet the maximum Scenario 2 criteria.
Post Sackett Wetland Scenarios documentation - 2026
scenario_3
scenario_3
String
255
0
0
Inclusive Connectivity included all wetlands identified in Scenarios 1 and 2 and added wetlands assigned the D (Continuously Saturated) water-regime modifier. These wetlands represent areas characterized primarily by prolonged soil saturation rather than persistent surface inundation.
Post Sackett Wetland Scenarios documentation - 2026
Jurisdictional
Wetland intersects or is within 0.5m of jurisdictional waters and meets the Scenario 3 criteria
Post Sackett Wetland Scenarios documentation - 2026
Non-jurisdictional
Wetland does not intersect/abut adjacent perennial waters with a continuous surface connection and does not meet the Scenario 3 criteria.
Post Sackett Wetland Scenarios documentation - 2026
scenario_3_max
scenario_3_max
String
255
0
0
Inclusive Connectivity included all wetlands identified in Scenarios 1 and 2 and added wetlands assigned the D (Continuously Saturated) water-regime modifier. These wetlands represent areas characterized primarily by prolonged soil saturation rather than persistent surface inundation.
This scenario includes more wetlands by expanding assumptions regarding artificial flow-path connectivity.
Post Sackett Wetland Scenarios documentation - 2026
Jurisdictional
Wetland intersects or is within 0.5m of perennial waters with a continuous surface connection and meets the max Scenario 3 criteria
Post Sackett Wetland Scenarios documentation - 2026
Non-jurisdictional
Wetland does not intersect/abut adjacent perennial waters with a continuous surface connection and does not and meet the max Scenario 3 criteria.
Post Sackett Wetland Scenarios documentation - 2026
borderWtlnds
Border_Wetlands_With
String
255
0
0
Wetlands that are present along the border of Virginia and a neighboring state. If present, this field lists the name of the neighboring state.
processor
ATTRIBUTE
Alphanumeric code identifying the wetland classification of the polygon.
http://www.fws.gov/wetlands/Data/Wetland-Codes.html
The wetland classification codes are a series of letter and number codes that have been developed to adapt the national wetland classification system to map form. These alpha-numeric codes correspond to the classification nomenclature (Cowardin et al. 1979) that best describes the habitat. (for example, PFO1A). Currently there are over 7,000 code combinations in the dataset with over 14 million possible permutations of the code. For information on the wetland codes visit: http://www.fws.gov/wetlands/Data/Wetland-Codes.html.
ATTRIBUTE
String
15
0
0
WETLAND_TYPE
General description of the wetland based on the Cowardin wetland classification.
http://www.fws.gov/wetlands/Data/Mapper-Wetlands-Legend.html
Lake
Lake or reservoir basin. Lacustrine wetland and deepwater (L).
http://www.fws.gov/wetlands/Data/Mapper-Wetlands-Legend.html
Freshwater Emergent Wetland
Herbaceous marsh, fen, swale and wet meadow. Palustrine emergent (PEM).
http://www.fws.gov/wetlands/Data/Mapper-Wetlands-Legend.html
Estuarine and Marine Wetland
Vegetated and non-vegetated brackish and saltwater marsh, shrubs, beach, bar, shoal or flat. Estuarine intertidal and Marine intertidal wetland (E2, M2).
http://www.fws.gov/wetlands/Data/Mapper-Wetlands-Legend.html
Other
Farmed wetland, saline seep and other miscellaneous wetland. Palustrine wetland (Misc. types, PUS, Pf..)
http://www.fws.gov/wetlands/Data/Mapper-Wetlands-Legend.html
Freshwater Pond
Pond. Palustrine unconsolidated bottom, Palustrine aquatic bed (PUB, PAB).
http://www.fws.gov/wetlands/Data/Mapper-Wetlands-Legend.html
Estuarine and Marine Deepwater
Open water estuary, bay, sound, open ocean. Estuarine and Marine subtidal water (E1, M1).
http://www.fws.gov/wetlands/Data/Mapper-Wetlands-Legend.html
Riverine
River or stream channel. Riverine wetland and deepwater (R).
http://www.fws.gov/wetlands/Data/Mapper-Wetlands-Legend.html
Freshwater Forested/Shrub Wetland
Forested swamp or wetland shrub bog or wetland. Palustrine forested and/or Palustrine shrub (PFO, PSS).
http://www.fws.gov/wetlands/Data/Mapper-Wetlands-Legend.html
WETLAND_TYPE
String
50
0
0
Simple
FALSE
425156
TRUE
TRUE
Tami Rudnicky
Virginia Institute of Marine Science
GIS Programmer/Analyst
Virginia Institute of Marine Science, P.O. Box 1346, 1375 Greate Rd
Gloucester Point
Virginia
23062
US
File Geodatabase Feature Class