Inventory of Managed Coastal Wetlands in Delaware Bay and Delaware's Inland Bays

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Sydney K. Nick
Originator: Zafer Defne
Originator: Kevin Kroeger
Publication_Date: 20230710
Title:
Inventory of Managed Coastal Wetlands in Delaware Bay and Delaware's Inland Bays
Edition: 1.0
Geospatial_Data_Presentation_Form: vector digital dataset (polygon)
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9VCYH3X
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher:
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
Other_Citation_Details:
Suggested citation: Nick, S.K., Defne, Z., and Kroeger, K.D., 2023, Inventory of managed coastal wetlands in Delaware and Delaware's inland bays: U.S. Geological Survey data release, https://doi.org/10.5066/P9VCYH3X.
Online_Linkage: https://doi.org/10.5066/P9VCYH3X
Online_Linkage:
Description:
Abstract:
This data release contains areas within Delaware Bay and Delaware Inland Bays that are within tidal elevations, as determined by the Highest Astronomical Tide (HAT), but that are classified as non-tidal or managed wetlands by the National Wetlands Inventory (NWI) or as non-estuarine by the 2016 Coastal Change Analysis Program (C-CAP) land cover dataset. These areas have been assigned the classification codes of NWI, where available, and C-CAP. These data are based on a 5m resolution elevation raster from Coastal National Elevation Database (CoNED), an interpolated surface from Highest Astronomical Tide (HAT) data from National Oceanographic and Atmospheric Administration (NOAA) tide gauges, and NWI and C-CAP digital wetland products. The area was determined by identifying non-tidal or non-wetland land covers at or below the interpolated HAT tidal elevation. The underlying wetland category from NWI or land cover type from C-CAP was then applied to the entire area to indicate areas for possible land or hydrologic management and assess current and future conditions of land within tidal elevations.
Purpose:
The purpose of this dataset is to identify and calculate the area of various land cover categories that are at tidal elevations but are not mapped as tidal wetlands by NWI, estuarine by 2016 C-CAP land cover, or mapped as modified wetlands by NWI. This dataset provides important information about interpreted managed tidal wetland areas for federal, state, and local managers to assess restoration potential, barriers within migration corridors, greenhouse gas accounting, and sea level rise planning.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2023
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -75.7796
East_Bounding_Coordinate: -74.6689
North_Bounding_Coordinate: 40.2658
South_Bounding_Coordinate: 38.5613
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme_Keyword: inlandWaters
Theme_Keyword: environment
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geospatial datasets
Theme_Keyword: wetland ecosystems
Theme_Keyword: wetland functions
Theme_Keyword: coastal ecosystems
Theme_Keyword: vegetation
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: salt marsh
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:647f5975d34eac007b562495
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States
Place_Keyword: Delaware Bay
Place_Keyword: Delaware
Place_Keyword: New Jersey
Access_Constraints: None
Use_Constraints:
The managed tidal wetland areas and associated land cover categories are for scientific research purposes and should not be used as a sole source of reference for any regulations and policy making. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the source of this information.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Sydney K. Nick
Contact_Organization: U.S. Geological Survey, Northeast Region
Contact_Position: Interdisciplinary Geographer/Geologist
Contact_Address:
Address_Type: mailing address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Country: US
Contact_Voice_Telephone: 508-548-8700x2343
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: snick@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: Browse_Graphic_File_Description: Graphic that shows the extent of managed coastal wetlands
Browse_Graphic_File_Type: JPEG
Native_Data_Set_Environment:
Environment as of Metadata Creation: Microsoft Windows 10; Esri ArcGIS Pro (version 3.0.2), R Studio (Version 2022.07.7+576)
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
C-CAP land cover categories have stated accuracy of 85% overall and 80% per class. NWI polygons do not have stated accuracy. Managed tidal wetland polygon and attribute accuracy is based on 30m resolution C-CAP and NWI attributes.
Logical_Consistency_Report:
There were topological errors (overlaps) in NWI polygons that accounted for a total area less than 1 acre and were therefore not corrected for this analysis and the data were used 'as is'. Small polygons (less than 1 acre) were removed from the managed coastal wetland vector dataset before assigning NWI and C-CAP attributes, however, once NWI and C-CAP values were assigned, smaller polygons were created and are in the final dataset. In the area of Supawna Meadows National Wildlife Refuge and Abbotts Meadows Wildlife Management Area (NWI project R05Y10P05), there are mapping errors in NWI that were not corrected for this dataset. Those areas should be noted and not used in further analyses.
A visual comparison of polygons and Esri world imagery was performed at randomly selected sites to check for consistency. Polygons that were clearly misidentified due to resolution or alignment errors between NWI and C-CAP were manually removed, although some misidentified polygons may remain in the dataset.
Completeness_Report:
The managed coastal wetland polygonal dataset covers Delaware, Delaware Inland Bays, the Delaware Bay area of New Jersey, and the Delaware River areas of Pennsylvania and New Jersey as far north as Trenton, NJ.
Sliver polygons of open salt water along the land/water boundary may also be included in some instances as a result of geoprocessing. Additionally, there are areas within polygons that have holes of varying sizes, and this is due to those areas being above HAT elevation or classified as estuarine or tidal wetland.
Errors within the NWI data were retained (e.g., Project R05Y10P05).
Topological errors in NWI polygons (overlaps) were retained but were negligible in calculations.
Small area (less than 1 acre) polygons were created as a result of overlaying NWI and C-CAP attributes, therefore polygons smaller than the 4046.8m2 (1 acre) minimum size precision limitation stated the logical consistency report are in the final dataset.
C-CAP is a raster with 30m resolution and therefore there may be some misclassified areas if the cell center coincided with an the edge of a land cover class in the source imagery used during creation. Additionally, the cell shape (30mx 30m square) was retained when converted to a vector and may not be coincident with NWI shape edges.
The 1m resolution elevation dataset was resampled to a 5m resolution, using nearest neighbor resampling and therefore may be different than field measurements.
All raster outputs were snapped to the interpolated surface raster and have no misalignment in the data that weren't inherent to the source data.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal accuracy is based on the input data and therefore is assumed to be +/- 30m, the most coarse of the input datasets.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Danielson, J.
Originator: Tyler, D.
Publication_Date: 20160501
Title:
Topobathymetric Model for Chesapeake Bay Region - Delaware and New Jersey 1859 to 2015
Edition: First
Geospatial_Data_Presentation_Form: raster digital dataset
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
Region based Coastal National Elevation Database (CoNED) data were downloaded for the area of interest in October 2022. CoNED is a 1m resolution topobathymetric dataset for the coastal region. CoNED uses a variety of data sources to create this seamless elevation data, including LiDAR. Data were downloaded as Chesapeake Bay NJ_DE_Topobathy, NAD 1983 UTM Zone 18N with the North American Datum of 1988 (NAVD88). Download date was 01/29/2020.
Online_Linkage: https://topotools.cr.usgs.gov/topobathy_viewer/
Type_of_Source_Media: Digital
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 18590101
Ending_Date: 20150131
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: USGS CoNED
Source_Contribution: Elevation dataset
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Fish and Wildlife Service
Publication_Date: 20210412
Title: National Wetland Inventory
Geospatial_Data_Presentation_Form: vector digital dataset (polygon)
Publication_Information:
Publication_Place: Madison, WI
Publisher: U.S. Fish and Wildlife Service
Other_Citation_Details:
Downloaded wetlands data for Delaware, New Jersey, and Pennsylvania in shapefile format from the NWI download page. Projection was NAD 1983 Albers. Download date was 04/12/2021.
Online_Linkage: https://www.fws.gov/wetlands/data/Data-Download.html
Type_of_Source_Media: Digital
Source_Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 2017
Single_Date/Time:
Calendar_Date: 2007
Single_Date/Time:
Calendar_Date: 1980
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: NWI
Source_Contribution: Wetlands dataset
Source_Information:
Source_Citation:
Citation_Information:
Originator: National Oceanographic and Atmospheric Administration
Publication_Date: 20220329
Title:
NOAA Tides and Currents Highest Astronomical Tide referenced to NAVD88, derived from NOAA Tides And Currents, 1983-2001 epoch
Geospatial_Data_Presentation_Form: tabular digital data
Other_Citation_Details:
R Studio (Version 2022.07.7+576) was used to pull metadata records for each station on 03/29/2022.
Online_Linkage: https://tidesandcurrents.noaa.gov/
Type_of_Source_Media: Digital
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1983
Ending_Date: 2001
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: NOAA HAT
Source_Contribution: Tidal datums
Source_Information:
Source_Citation:
Citation_Information:
Originator: National Oceanographic and Atmospheric Administration
Publication_Date: 20200301
Title: 2016 Coastal Change Analysis Program Land Cover
Geospatial_Data_Presentation_Form: raster digital data
Other_Citation_Details: Downloaded 6/14/2021
Online_Linkage: https://www.fisheries.noaa.gov/inport/item/48336
Type_of_Source_Media: Digital
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2016
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: CCAP
Source_Contribution: Land cover
Process_Step:
Process_Description:
This process step and all subsequent process steps were performed by the same person, Sydney Nick, in ArcGIS Pro (ver. 3.0.2), unless otherwise stated. For simple operations, the name of the geoprocessing tool used is given in capital letters; for complex operations, the name of geoprocessing tool used is given in capital letters and any critical parameters used are specified in the step. The input and output file names are provided in [square brackets] when necessary. All steps were performed with the map projection set to NAD_1983_Albers and inputs and outputs were stored as feature classes within a file geodatabase unless otherwise noted.
This process step creates a spatial domain, converts Highest Astronomical Tide (HAT) data to NAVD88, interpolates a surface, and prepares CoNED elevation data.
1. Create an area of interest polygon [aoi] that encompasses the Delaware Bay region that can be used to eliminate excess data. 2. Create a HAT surface: a) Download NOAA tide gauge data for gauges with both NAVD88 and HAT tidal datums. Identify the tidal gauges that have both NAVD88 and HAT values that encompass the entirety of the Delaware Bay region.
b) Subtract the NAVD88 value from the HAT value for the 31 gauges within our Delaware Bay spatial domain ([aoi]).
c) PROJECT tide gauge xy coordinates to NAD_1983_Albers [de_bay_tides.shp].
d) Using the GEOSTATISTICAL WIZARD KRIGING tool and [de_bay_tides.shp], perform a simple kriging prediction, normal score transformation, covariance variogram, and set anisotropy as enabled. Use the defaults for all other variables. EXPORT resulting surface at a 5m resolution and NAD83 spatial reference [HAT_surface].
3. Create an elevation dataset: a) Use PROJECT RASTER to project the CoNED raster to NAD_1983_Albers [njde_proj].
b) RESAMPLE [njde_proj] to a 5m resolution using nearest neighbor resampling techniques [njde_5m]. The HAT surface was used as a snap raster to eliminate any cell misalignment during overlay.
Source_Used_Citation_Abbreviation: NOAA HAT
Source_Used_Citation_Abbreviation: USGS CoNED
Process_Date: 2022
Source_Produced_Citation_Abbreviation: njde_5m
Source_Produced_Citation_Abbreviation: aoi
Source_Produced_Citation_Abbreviation: HAT_surface
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Sydney K Nick
Contact_Organization: U.S. Geological Survey, Northeast Region
Contact_Position: Interdisciplinary Geographer/Geologist
Contact_Address:
Address_Type: mailing address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Country: US
Contact_Voice_Telephone: 508-548-8700x2343
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: snick@usgs.gov
Process_Step:
Process_Description:
This process step creates the Coastal Change Analysis Program (C-CAP) raster and polygon and National Wetlands Inventory (NWI) feature classes within the spatial domain.
a) Use PROJECT RASTER to project the C-CAP raster to NAD_1983_Albers, using the HAT surface raster as a snap raster in the environment settings to produce [ccap_snap].
b) Eliminate excess data beyond our spatial domain using EXTRACT BY MASK (input raster: ccap_snap; input raster or feature mask data: [aoi]; extraction area: Inside) to create [ccap_aoi].
c) Create a polygon feature class of estuarine wetland areas as defined by C-CAP ([ccap_est_poly]) by using EXTRACT BY ATTRIBUTES (input raster: [ccap_aoi]; VALUE = 16 (estuarine forested wetland) OR VALUE = 17 (estuarine scrub shrub wetland) OR VALUE=18 (estuarine emergent wetland)) and perform RASTER TO POLYGON on the output.
d) Convert C-CAP raster [ccap_aoi] to vector using RASTER TO POLYGON (input raster: [ccap_aoi]; field: Value; output polygon features: [ccap_poly], simplify polygons: FALSE, create multipart features: FALSE) to create a feature class of all C-CAP areas [ccap_poly].
e) CLIP NWI polygons to aoi [nwi].
f) Create an additional field in the [nwi] attribute table with the name "ATTRIBUTE_original" by using the CALCULATE FIELD (input table: [nwi]; field name: ATTRIBUTE_orginal; expression type: Python 3; Expression: ATTRIBUTE_original = !WETLAND_TYPE!).
g) Because oligohaline in inconsistently used throughout the dataset, remove the oligohaline modifier by using CALCULATE FIELD (input table: [nwi]; field name: ATTRIBUTE_new; expression type: Python 3; Expression: NWI_TYPE=replace(!ATTRIBUTE!). code block: import re def replace(val): return re.sub ('6', '', val). This provides the user with the original NWI attribute if oligohaline modifier is desired.
h) Create a feature class of the salt marshes as defined by NWI. SELECT BY ATTRIBUTE (ATTRIBUTE LIKE "E2EM%") from [nwi] EXPORT features [saltmarsh]).
I) This step creates a polygonal feature class containing estuarine, marine, and fresh tidal, excluding those polygons with modifiers indicating they have been or are managed. To create [nwi_tidal] use the following sequence of three SQL statements on [nwi]: Create new selection: WETLAND_TYPE = 'Estuarine and Marine Deepwater' OR WETLAND_TYPE = 'Estuarine and Marine Wetland'; add to current selection: (ATTRIBUTE LIKE '%L%' AND ATTRIBUTE NOT LIKE 'L%' AND ATTRIBUTE NOT LIKE '%ML%') OR (ATTRIBUTE LIKE '%M%' AND ATTRIBUTE NOT LIKE '%EM%') OR ATTRIBUTE LIKE '%N%' OR (ATTRIBUTE LIKE '%P%' AND ATTRIBUTE NOT LIKE 'P%') OR ATTRIBUTE LIKE '%Q%' OR (ATTRIBUTE LIKE '%R%' AND ATTRIBUTE NOT LIKE '%RB%' AND ATTRIBUTE NOT LIKE '%RS%' AND ATTRIBUTE NOT LIKE 'R%') OR (ATTRIBUTE LIKE '%S%' AND ATTRIBUTE NOT LIKE '%SS%' AND ATTRIBUTE NOT LIKE '%US%' AND ATTRIBUTE NOT LIKE '%SB%') OR ATTRIBUTE LIKE '%T%' OR ATTRIBUTE LIKE '%V%'; remove from current selection: ATTRIBUTE LIKE '%b%' OR ATTRIBUTE LIKE '%d%' OR ATTRIBUTE LIKE '%f%' OR ATTRIBUTE LIKE '%h%' OR ATTRIBUTE LIKE '%m%' OR ATTRIBUTE LIKE '%r' OR ATTRIBUTE LIKE '%s%' OR ATTRIBUTE LIKE '%x%' EXPORT FEATURES.
Source_Used_Citation_Abbreviation: NWI
Source_Used_Citation_Abbreviation: CCAP
Source_Used_Citation_Abbreviation: aoi
Process_Date: 2022
Source_Produced_Citation_Abbreviation: ccap_snap
Source_Produced_Citation_Abbreviation: ccap_aoi
Source_Produced_Citation_Abbreviation: ccap_est_poly
Source_Produced_Citation_Abbreviation: ccap_poly
Source_Produced_Citation_Abbreviation: nwi
Source_Produced_Citation_Abbreviation: saltmarsh
Source_Produced_Citation_Abbreviation: nwi_tidal
Process_Step:
Process_Description:
This process step, and the next two process steps, create a vegetation adjusted raster from [njde_5m]. This adjustment is to account for documented lidar inaccuracies in densely vegetated marshes, resulting in higher than ground elevations.
a) RASTER CALCULATOR with the expression: Con("njde_5m" <= "HAT_surface",1) to create [con1].
b) RASTER TO POLYGON (input raster: [con1]; field: Value, output polygon features: [con2]; simplify polygons: FALSE; create multipart features: FALSE).
c) PAIRWISE ERASE (input features: [saltmarsh]; erase features: [con2]; output features: [misses]).
d) POLYGON TO RASTER (input features: [misses]; value field: OBJECTID; output raster dataset: [missras]; cell assignment type: cell center; priority field: NONE; cell size: [HAT_surface]; environment snap raster: [HAT_surface]. i) RASTER TO POINT [missras]. ii) EXTRACT MULTI VALUES TO POINTS (fieldmap follows this format input raster: output field name. [HAT_surface]: hat; njde_5m: coned).
g) SELECT LAYER BY ATTRIBUTE "coned IS NOT NULL" and export table to csv using TABLE TO TABLE [misspts.csv].
Source_Used_Citation_Abbreviation: njde_5m
Source_Used_Citation_Abbreviation: HAT_surface
Source_Used_Citation_Abbreviation: saltmarsh
Process_Date: 2022
Source_Produced_Citation_Abbreviation: misspts.csv
Process_Step:
Process_Description:
This process step uses R Studio (Version 2022.07.7+576) to identify the 75th percentile value between the CoNED elevation and HAT surface.
a) Read [misspts.csv] into the RStudio environment with the read.csv function.
b) Add a column and calculate the difference between CoNED and HAT using the syntax coned-hat.
c) Calculate the 0.75 quantile of the differences between CoNED and HAT and use the resulting number in the following process step. For this data product, the adjustment factor was 0.25m.
Source_Used_Citation_Abbreviation: misspts.csv
Process_Date: 2022
Source_Produced_Citation_Abbreviation: 0.25 CoNED adjustment factor
Process_Step:
Process_Description:
This process step uses the 75th quantile calculated in the previous step to adjust the CoNED elevation dataset in areas where NWI and C-CAP have mapped estuarine emergent wetlands.
a) POLYGON TO RASTER [saltmarsh] using [HAT_surface] as both cell size and snap raster [sm_ras].
b) EXTRACT BY ATTRIBUTES [ccap_aoi] with the query statement: "where VALUE is equal to 18" to create [ccap_est].
c) MOSAIC TO NEW RASTER [ccap_est] and [sm_ras] to create [area2corr].
d) TIMES [area2corr] with a constant value of 0 to create [area2corr_0].
e) Add the vegetation adjustment factor (0.25 as the constant value) to [area2corr_0] using the PLUS tool and specifying in the processing environments both cell size and snap raster are set to [HAT_surface] to create [area2corr_25].
f) Using MINUS, subtract [area2corr_25] from [njde_5m] to create [correction].
g) Create the vegetation adjusted CoNED raster [coned_corr] by using MOSAIC TO NEW RASTER and listing the input rasters in the following order: [njde_5m], [correction] with the following parameters: spatial reference: [njde_5m]; pixel type: 32 bit float; number of bands: 1; mosaic operator: last.
Source_Used_Citation_Abbreviation: saltmarsh
Source_Used_Citation_Abbreviation: HAT_surface
Source_Used_Citation_Abbreviation: ccap_aoi
Source_Used_Citation_Abbreviation: ccap_est_poly
Process_Date: 2022
Source_Produced_Citation_Abbreviation: coned_corr
Process_Step:
Process_Description:
This process step uses the vegetation corrected CoNED [coned_corr] to create the tidal domain from which to identify managed tidal wetlands.
a) Use RASTER CALCULATOR to create the tidal domain raster [Tidal], which will only include areas with elevations that are at or below the interpolated HAT surface. To do so, use the map algebra expression: Con( "coned_corr"<= "HAT_surface", "coned_corr"). This will result in a vegetation adjusted CoNED raster only in the areas that meet the expression criteria (elevation values maintained within the identified tidal domain, which can be used for further analyses).
b) Use RASTER CALCULATOR to create the tidal domain raster [Tidal_simple] with the map algebra expression: Con( "coned_corr"<= "HAT_surface", 1). This will result in a simplified, binary 1/NoData raster of areas that have elevations at or below the interpolated HAT surface.
c) Vectorize the tidal domain [Tidal_simple] using RASTER TO POLYGON (simplify features: FALSE; create multipart features: FALSE; [tidal_poly].
Source_Used_Citation_Abbreviation: coned_corr
Source_Used_Citation_Abbreviation: HAT_surface
Process_Date: 2023
Source_Produced_Citation_Abbreviation: tidal_poly
Process_Step:
Process_Description:
This step uses the tidal domain [tidal_poly], [nwi_tidal], and [ccap_est_poly] to identify areas at tidal wetland elevations that are either mapped as non-tidal or managed tidal wetlands and assigns them both NWI (as ATTRIBUTE in the attribute table) and C-CAP attributes (as gridcode).
a) ERASE (input features: [tidal_poly]; erase features: [nwi_tidal]) to create [tidal_nwi_erase].
b) ERASE (input features: [tidal_nwi_erase]; erase features: [ccap_est_poly]) to create [mod].
c) MULTIPART TO SINGLEPART [mod] to create [mod_single], Eliminate features smaller than our 1acre minimum size requirement by using SELECT BY ATTRIBUTE Shape_Area greater than or equal to 4046.8 (1 acre), EXPORT FEATURES to create [mod_sizemin].
d) Using [mod_sizemin] as the input, [nwi] as the identity features, run IDENTITY to create [modnwi]
e) SELECT BY ATTRIBUTE from [modnwi] ATTRIBUTE LIKE '%E1UBLx%' And Shape_Area > 500000 to eliminate the large human-made canals..
f) Using [modnwi] as the input and [ccap_poly] as the identity features, run IDENTITY a second time to create [mod_wetlands]. The column named gridcode corresponds to C-CAP classifications.
g) An additional field was created to maintain the original NWI WETLAND_TYPE field for users who may wish to use it in further analyses. This new field can be used for examining NWI wetland type versus areas not mapped by NWI and can used to provide C-CAP categories in subsequent steps via a table join from a csv of C-CAP labels. CALCULATE FIELD (input table: [mod_wetlands]; field name: NWI_TYPE; expression type: Python 3; Expression: NWI_TYPE=typ(!WETLAND_TYPE!). code block: def typ(p1): if len(p1)<2: return("Undesignated Potential Wetland") else: return(p1)
h) Create and calculate geometry for fields acres and hectares.
i)Project [mod_wetlands] to WGS84 using the WGS_1984_(ITRF00)_To_NAD_1983 geographic transformation.
j) Keep only the following fields: FID, Shape, Orig_FID acres, ATTRIBUTE, WETLAND_TYPE, NWI_TYPE, gridcode_1, CCAP_Category, Hectares, Shape_Length, Shape_Area, before exporting to a shapefile [managed_wetlands]. Note that the fields will be shortened to the following when exported to a shapefile: FID, Shape, ORIG_FID_Acres, ATTRIBUTE, WETLAND_TY, ATTRIBUTE_, NWI_TYPE, gridcode_1, Hectare, Shape_Leng, Shape_Area.
Source_Used_Citation_Abbreviation: tidal_poly
Source_Used_Citation_Abbreviation: nwi_tidal
Source_Used_Citation_Abbreviation: ccap_est_poly
Source_Used_Citation_Abbreviation: nwi
Source_Used_Citation_Abbreviation: ccap_poly
Process_Date: 2023
Source_Produced_Citation_Abbreviation: managed_wetlands
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 73981
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0197509172
Longitude_Resolution: 0.0254454507
Geographic_Coordinate_Units: Decimal seconds
Geodetic_Model:
Horizontal_Datum_Name: WGS_1984
Ellipsoid_Name: WGS 84
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: managed_wetlands
Entity_Type_Definition:
Table containing attribute information associated with the dataset.
Entity_Type_Definition_Source: Producer Defined
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Shape type.
Attribute:
Attribute_Label: Acres
Attribute_Definition: Total area of polygon in U.S. Survey acres
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.08688573327e-09
Range_Domain_Maximum: 799.059208239
Attribute_Units_of_Measure: U.S. Acres
Attribute:
Attribute_Label: ATTRIBUTE
Attribute_Definition: NWI alpha-numeric wetland classification codes.
Attribute_Definition_Source: USFWS
Attribute_Domain_Values:
Unrepresentable_Domain:
These are the attributes from the NWI source layer after removing the oligohaline modifier
Attribute:
Attribute_Label: WETLAND_TY
Attribute_Definition: NWI Wetland Type as defined by NWI.
Attribute_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: empty cell
Enumerated_Domain_Value_Definition: No underlying NWI data
Enumerated_Domain_Value_Definition_Source: USGS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Freshwater Forested/Shrub Wetland
Enumerated_Domain_Value_Definition: Forested swamp or wetland shrub bog or wetland.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Freshwater Emergent Wetland
Enumerated_Domain_Value_Definition: Herbaceous marsh, fen, swale and wet meadow.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Riverine
Enumerated_Domain_Value_Definition: Riverine wetland and deepwater.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Estuarine and Marine Wetland
Enumerated_Domain_Value_Definition:
Vegetated and non-vegetated brackish and saltwater marsh, shrubs, beach, bar, shoal or flat.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Lake
Enumerated_Domain_Value_Definition: Lake or reservoir basin.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Freshwater Pond
Enumerated_Domain_Value_Definition: Pond or aquatic bed.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Estuarine and Marine Deepwater
Enumerated_Domain_Value_Definition: Open water estuary, bay, sound, open ocean.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Other
Enumerated_Domain_Value_Definition: Farmed wetland, saline seep and other miscellaneous wetland.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute:
Attribute_Label: ATTRIBUTE_
Attribute_Definition: NWI attributes, including the oligohaline modifier
Attribute_Definition_Source: USFWS
Attribute_Domain_Values:
Unrepresentable_Domain: These are the original attributes from the NWI source layer.
Attribute:
Attribute_Label: NWI_TYPE
Attribute_Definition:
NWI wetland type. If no NWI polygons intersected, the area was coded Undesignated Potential Wetland.
Attribute_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Undesignated Potential Wetland
Enumerated_Domain_Value_Definition: No underlying NWI wetlands.
Enumerated_Domain_Value_Definition_Source: Producer defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Freshwater Forested/Shrub Wetland
Enumerated_Domain_Value_Definition: Forested swamp or wetland shrub bog or wetland.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Freshwater Emergent Wetland
Enumerated_Domain_Value_Definition: Herbaceous marsh, fen, swale and wet meadow.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Riverine
Enumerated_Domain_Value_Definition: River or stream channel.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Estuarine and Marine Wetland
Enumerated_Domain_Value_Definition:
Vegetated and non-vegetated brackish and saltwater marsh, shrubs, beach, bar, shoal or flat.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Lake
Enumerated_Domain_Value_Definition: Lake or reservoir basin.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Freshwater Pond
Enumerated_Domain_Value_Definition: Pond or aquatic bed.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Estuarine and Marine Deepwater
Enumerated_Domain_Value_Definition: Open water estuary, bay, sound, open ocean.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Other
Enumerated_Domain_Value_Definition: Farmed wetland, saline seep and other miscellaneous wetland.
Enumerated_Domain_Value_Definition_Source: USFWS
Attribute:
Attribute_Label: gridcode_1
Attribute_Definition:
CCAP source data raster code. Numerically identified and retained for table joining purposes.
Attribute_Definition_Source: NOAA
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2
Range_Domain_Maximum: 22
Attribute:
Attribute_Label: CCAP_Categ
Attribute_Definition: CCAP land cover category in string format.
Attribute_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Palustrine Scrub/Shrub Wetland
Enumerated_Domain_Value_Definition:
Includes tidal and nontidal wetlands dominated by woody vegetation less than 5m in height, and all such wetlands that occur in tidal areas in which salinity due to ocean-derived salts is below 0.05 percent (0.5 ppt). Total vegetation. coverage is greater than 20 percent. Species present could be true shrubs, young trees and shrubs, or trees that are small or stunted due to environmental conditions.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Medium Intensity Developed
Enumerated_Domain_Value_Definition:
Contains areas with a mixture of constructed materials and vegetation or other cover. Constructed materials account for 50 to 79 percent of total area. This class commonly includes multi- and single-family housing areas, especially in suburban neighborhoods, but may include all types of land use.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Developed Open Space
Enumerated_Domain_Value_Definition:
Contains areas with a mixture of some constructed materials, but mostly managed grasses or low-lying vegetation planted in developed areas for recreation, erosion control, or aesthetic purposes. These areas are maintained by human activity such as fertilization and irrigation, are distinguished by enhanced biomass productivity, and can be recognized through vegetative indices based on spectral characteristics. Constructed surfaces account for less than 20 percent of total land cover.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Deciduous Forest
Enumerated_Domain_Value_Definition:
Contains areas dominated by trees generally greater than 5m tall and greater than 20 percent of total vegetation cover. More than 75 percent of the tree species shed foliage simultaneously in response to seasonal change.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Low Intensity Developed
Enumerated_Domain_Value_Definition:
Contains areas with a mixture of constructed materials and substantial amounts of vegetation or other cover. Constructed materials account for 21 to 49 percent of total area. This subclass commonly includes single-family housing areas, especially in rural neighborhoods, but may include all types of land use.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: High Intensity Developed
Enumerated_Domain_Value_Definition:
Contains significant land area and is covered by concrete, asphalt, and other constructed materials. Vegetation, if present, occupies less than 20 percent of the landscape. Constructed materials account for 80 to 100 percent of the total cover. This class includes heavily built-up urban centers and large constructed surfaces in suburban and rural areas with a variety of land uses.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Palustrine Forested Wetland
Enumerated_Domain_Value_Definition:
Includes tidal and nontidal wetlands dominated by woody vegetation greater than or equal to 5m in height, and all such wetlands that occur in tidal areas in which salinity due to ocean-derived salts is below 0.05 percent (0.5 ppt). Total vegetation coverage is greater than 20 percent.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Scrub/Shrub
Enumerated_Domain_Value_Definition:
Contains areas dominated by shrubs less than 5m tall with shrub canopy typically greater than 20 percent of total vegetation. This class includes tree shrubs, young trees in an early successional stage, or trees stunted from environmental conditions.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Palustrine Emergent Wetland
Enumerated_Domain_Value_Definition:
Includes tidal and nontidal wetlands dominated by persistent emergent vascular plants, emergent mosses or lichens, and all such wetlands that occur in tidal areas in which salinity due to ocean-derived salts is below 0.05 percent (0.5 ppt). Total vegetation cover is greater than 80 percent. Plants generally remain standing until the next growing season.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Cultivated
Enumerated_Domain_Value_Definition:
Contains areas intensely managed for the production of annual crops. Crop vegetation accounts for greater than 20 percent of total vegetation. This class also includes all land being actively tilled.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Mixed Forest
Enumerated_Domain_Value_Definition:
Contains areas dominated by trees generally greater than 5m tall, and greater than 20 percent of total vegetation cover. Neither deciduous nor evergreen species are greater than 75 percent of total tree cover. Both coniferous and broad-leaved evergreens are included in this category.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Bare Land
Enumerated_Domain_Value_Definition:
Contains areas of bedrock, desert pavement, scarps, talus, slides, volcanic material, glacial debris, sand dunes, strip mines, gravel pits, and other accumulations of earth material. Generally, vegetation accounts for less than 10 percent of total cover.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Water
Enumerated_Domain_Value_Definition:
Includes areas of open water, generally with less than 25 percent cover of vegetation or soil.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Grassland
Enumerated_Domain_Value_Definition:
Contains areas dominated by grammanoid or herbaceous vegetation, generally greater than 80 percent of total vegetation. These areas are not subject to intensive management such as tilling but can be utilized for grazing.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Unconsolidated Shore
Enumerated_Domain_Value_Definition:
Includes material such as silt, sand, or gravel that is subject to inundation and redistribution due to the action of water. Substrates lack vegetation except for pioneering plants that become established during brief periods when growing conditions are favorable.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Evergreen Forest
Enumerated_Domain_Value_Definition:
Contains areas dominated by trees generally greater than 5m tall and greater than 20 percent of total vegetation cover. More than 75 percent of the tree species maintain their leaves all year. Canopy is never without green foliage.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Palustrine Aquatic Bed
Enumerated_Domain_Value_Definition:
Includes tidal and nontidal wetlands and deepwater habitats in which salinity due to ocean-derived salts is below 0.05 percent (0.5 ppt) and which are dominated by plants that grow and form a continuous cover principally on or at the surface of the water. These include algal mats, detached floating mats, and rooted vascular plant assemblages. Total vegetation cover is greater than 80 percent.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Pasture/Hay
Enumerated_Domain_Value_Definition:
Contains areas of grasses, legumes, or grass-legume mixtures planted for livestock grazing or the production of seed or hay crops, typically on a perennial cycle and not tilled. Pasture/hay vegetation accounts for greater than 20 percent of total vegetation.
Enumerated_Domain_Value_Definition_Source: NOAA
Attribute:
Attribute_Label: Hectare
Attribute_Definition: Total area of polygon in hectares.
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.39848810404e-10
Range_Domain_Maximum: 871.369323.369082349
Attribute_Units_of_Measure: Hectares
Attribute:
Attribute_Label: Shape_Leng
Attribute_Definition:
Esri populated number corresponding to the perimeter measurement, in meters, calculated in NAD83.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0102931074126
Range_Domain_Maximum: 122399.581013
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Shape_Area
Attribute_Definition:
Esri populated number corresponding to area, in square meters, calculated in NAD83.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.39848810404e-06
Range_Domain_Maximum: 3233690.82349
Attribute_Units_of_Measure: square meters
Overview_Description:
Entity_and_Attribute_Overview:
This dataset contains managed tidal wetlands along the Delaware, New Jersey, and Pennsylvania regions of Delaware Bay. The landscape has been divided into individual polygons at tidal elevations and their corresponding NWI (where applicable), and C-CAP attributes are included. The size of these polygons may be smaller than our 1 acre threshold, as defined in the process, due to the splitting that occurred during the IDENTITY step.
Entity_and_Attribute_Detail_Citation: USGS
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - ScienceBase
Contact_Address:
Address_Type: mailing and physical
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov
Resource_Description:
managed_wetlands.zip (ZIP file contains a zip file for the shapefile managed_wetlands.shp and the additional shapefile components), the browse graphic, and FGDC CSDGM metadata in xml format.
Distribution_Liability:
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: shapefile
Transfer_Size: 28
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
The first link is to download all the file on the landing page in a ZIP file. The second link is to the landing page of the data where individual files can be downloaded. The third link is to the main landing page of the publication, which is the same as the dataset landing page.
Fees: None. No fees are applicable for obtaining the data set.
Metadata_Reference_Information:
Metadata_Date: 20230710
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Sydney K. Nick
Contact_Organization: U.S. Geological Survey, Northeast Region
Contact_Position: Interdisciplinary Geographer/Geologist
Contact_Address:
Address_Type: mailing address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Country: US
Contact_Voice_Telephone: 508-548-8700x2343
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the person is no longer with the USGS.
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_P9VCYH3X/managed_wetlands.html>
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