In 2016 NYC Parks contracted with the UVM Spatial Analysis Lab to use modern remote sensing and object-based image analysis to create a new wetlands map for New York City. Data inputs include Light Detection and Ranging Data, State and Federal Wetland Inventories, soils, and field data. Because the map was conservative in its wetlands predictions, NYC Parks staff improved the map through a series of desktop and field verification efforts. From June to November 2020, NYC Parks staff field verified the majority of wetlands on NYC Parks' property.

The map will be opportunistically updated depending on available field information and delineations. Another dedicated field verification effort has not been planned. As of June 2021, no subsequent updates to the data are scheduled.

Original field names were updated to field names that are easier to understand.

This dataset was developed to increase awareness regarding the location and extent of wetlands to promote restoration and conservation in New York City. This map does not supersede U.S. Fish and Wildlife Service National Wetlands Inventory (NWI) and New York State Department of Environmental Conservation (NYSDEC) wetlands maps and has no jurisdictional authority. It should be used alongside NWI and NYSDEC datasets as a resource for identifying likely locations of wetlands in New York City. Mapped features vary in the confidence of their verification status, ranging from "Unverified" (meaning the feature exists in its original remotely mapped form and has not been ground truthed) to "Verified - Wetland Delineation" (meaning the boundaries and type of wetland have been verified during an official wetland delineation). Because of the rapid nature of the protocol and the scale of data collection, this product is not a subsitute for on-site investigations and field delineations. The dataset also includes broad classifications for each wetland type, e.g. estuarine, emergent wetland, forested wetland, shrub/scrub wetland, or water. Cowardin classifcations were not used given rapid verfication methods.

The accuracy of the wetlands map has improved over time as a result of the verification process. Fields were added over time as necessitated by the workflow and values were updated with information, either from the field verifications, delineation reports, or desktop analysis.

OBJECTID, Shape, Class_Name_Final, Verification_Status, Create_Date, Last_Edited_Date, Verification_Status_Year, SHAPE_Length, SHAPE_Area

https://www.nycgovparks.org/greening/natural-resources-group

Data Dictionary: https://docs.google.com/spreadsheets/d/1a45qCho45MV-AuOlGxyaRp0cg3cRFKw4lAYBIaU3zi4/edit#gid=260500519

Map: https://data.cityofnewyork.us/dataset/NYC-Wetlands/7piy-bhr9

The Informational Freshwater Wetland Mapping layer is only intended to be used for informational purposes in identifying the general location and extent of freshwater wetland areas of any size throughout the state. Informational Freshwater Wetland Mapping is not regulatory. The Freshwater Wetlands Act changed in 2022 such that wetlands greater than 12.4 acres in size are regulated regardless of their mapping status. In addition to larger wetlands, the Freshwater Wetlands Act regulates smaller wetlands of “unusual importance” if they meet one of eleven criteria described in the law and regulation. While maps contained on the Environmental Resource Mapper provide information on the potential locations of wetlands, the only definitive way to determine if a particular parcel or property contains regulated wetlands outside the Adirondack Park is to request a jurisdictional determination through DEC’s website (https://dec.ny.gov/nature/waterbodies/wetlands/freshwater-wetlands-program). The Freshwater Wetlands Act regulates most development activities located in the wetland or within a regulated “adjacent area.” This adjacent area is a minimum of 100 feet but may be extended for a limited number of particularly sensitive wetlands. Not all activities in and near wetlands are regulated. There are many exempt activities that landowners may undertake without permits. However, if you are not sure of which activities require permits near New York State regulated wetlands, please contact your regional DEC office.Wetlands are classified from Class I (which provide the most benefits) to Class IV (which provide fewer benefits). The classification is based on the work that wetlands do, such as storing flood water and providing wildlife habitat. The system for classifying wetlands is contained in regulation (6 NYCRR Part 664) and the classification of individual wetlands is determined as part of the jurisdictional determination process.For additional information on NYS Freshwater Wetlands, see DEC's website (https://dec.ny.gov/nature/waterbodies/wetlands/freshwater-wetlands-program).View Dataset on the GatewayFor information on wetlands inside the Adirondack Park, please contact the Adirondack Park Agency. For information on wetlands regulated under federal law, please contact the United State Army Corps of Engineers.Contact for this Data:DFW, Bureau of Ecosystem Health625 BroadwayAlbany, NY 12233Phone: 518-402-8920fw.ecohealth@dec.ny.gov

This dataset contains only those wetlands regulated by the New York State Freshwater Wetlands Act. It does not necessarily contain wetlands regulated by other jurisdictions or unregulated wetlands, nor does it contain tidal wetlands regulated by New York State under the Tidal Wetlands Act (ECL Article 25).This dataset was originally composed of a set of ARC/INFO coverages containing both polygonal and linear features. The Coverages are based on official New York State Freshwater Wetlands Maps as described in Article 24-0301 of the Environmental Conservation Law. Coverages are not, however, a legal substitute for the official maps. Coverages are available on a county basis for all areas of New York State outside the Adirondack Park. The coverage for Columbia County incorporates proposed amendments which became the official regulatory wetland boundaries as of November 30, 2011 and March 5, 2013.An important feature of the official maps is that the lines indicate only "the approximate location of the actual boundaries of the wetlands" (ECL Section 24-0301(3)). For a final determination of the actual location of a wetland it is necessary to contact the NYSDEC office for the region in which the wetland occurs.Columbia County is in Region 4.

Tidal wetlands in New York State are found on the Hudson River from the Troy Dam south to the southern tip of Staten Island, and along the entire shoreline of Long Island, including the shorelines of Gardiners Island, Shelter Island and Fishers Island.Service layer is updated as needed and was last updated 4/21/23.For more information see https://dec.ny.gov/nature/waterbodies/wetlands/tidal1. The NYS DEC asks to be credited in derived products.2. Secondary Distribution of the data is not allowed.3. Any documentation provided is an integral part of the data set. Failure to use the documentation in conjunction with the digital data constitutes misuse of the data.4. Although every effort has been made to ensure the accuracy of information, errors may be reflected in the data supplied. The user must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions.

Wetlands that are currently mapped or officially proposed for addition to the wetland maps and currently regulated under the New York State Freshwater Wetlands Act outside the Adirondack Park. They do not show ALL wetlands that may be present in an area. There may be additional wetlands on a site that may be protected under local or federal law. This map information is also available as paper maps or as digital data.DEC occasionally amends the regulatory maps to correct errors, such as inaccurate boundaries or wetlands that are missing from the maps. These amendments are conducted through a formal process that includes public notice and an opportunity to comment on the accuracy of the amendment. When official notice of the amendment has been placed, the area proposed for addition becomes regulated and the proposed amendment changes will be included on the website. When new maps are completed, they are filed in the offices of local government clerks. At that time, the boundaries on this website are also updated.Around every state-protected wetland is an “adjacent area” that is also subject to regulation in order to help better protect the wetland against surrounding disturbance. This adjacent area is a minimum of 100 feet, but has been extended for a limited number of particularly sensitive wetlands.The map displayed in this application shows a “Check Zone”, which is an area surrounding a wetland, as depicted on the map, that may also contain wetlands. DEC strongly suggests that if you are considering buying land or undertaking a project within this “check zone” that you request a more precise delineation to determine where the actual wetland boundary may be. To request a delineation, please contact your Regional DEC Office.There are a number of reasons why the boundary may be different from those actually drawn on the map:The mapping is intended to show the approximate location of the actual wetland boundary. The official regulatory maps are drawn at a scale (usually 1" = 2000') that does not establish an exact wetland boundary.When you zoom in on a wetland on the computer, you are attempting to look at the wetland boundary more precisely than the scale at which the wetland was mapped.Wetlands change over time and some maps may have been created over 35 years ago. The actual wetland boundaries may have changed since that time.Wetland classifications: Wetlands are classified from Class I (which provide the most benefits) to Class IV (which provide fewer benefits). The classification is based on the work that wetlands do, such as storing flood water and providing wildlife habitat. The system for classifying wetlands is contained in the New York State wetlands Classification System . Information about how any individual wetland was classified is contained in program files at the regional DEC office in which the wetland is located. Information on how wetlands are mapped can be found at DEC's Freshwater Wetlands Mapping pages https://www.dec.ny.gov/lands/5124.html Not all activities in wetlands are regulated. There are many exempt activities that landowners may undertake without permits, however, if you are not sure, please contact your regional DEC office to help you determine if a permit is required.For additional information on NYS Freshwater Wetlands, see DEC's Freshwater Wetlands pages https://www.dec.ny.gov/lands/4937.html For information on wetlands inside the Adirondack Park , please contact the Adirondack Park Agency https://www.apa.ny.gov/ .

NYS DEC provides each counties regulated freshwater wetlands dataset with a shapefile containing "check zones." These are 500 foot zones around wetland polygons and 200 foot zones around linear wetlands. Due to the approximate nature of the mapped wetland boundaries, NYSDEC recommends that if you are planning a project within the check zone, you should check with NYSDEC to determine if a wetlands permit is required. The check zone should not be confused with the regulated adjacent area (usually 100 feet, but sometimes more) surrounding a wetland.

The Freshwater Wetlands Act changed in 2022 such that wetlands greater than 12.4 acres in size are regulated regardless of their mapping status. In addition to larger wetlands, the Freshwater Wetlands Act regulates smaller wetlands of “unusual importance” if they meet one of eleven criteria described in the law and regulation. While maps contained provide information on the potential locations of wetlands, the only definitive way to determine if a particular parcel or property contains regulated wetlands outside the Adirondack Park is to request a jurisdictional determination through DEC’s website (https://dec.ny.gov/nature/waterbodies/wetlands/freshwater-wetlands-program). The Freshwater Wetlands Act regulates most development activities located in the wetland or within a regulated “adjacent area.” This adjacent area is a minimum of 100 feet but may be extended for a limited number of particularly sensitive wetlands. Not all activities in and near wetlands are regulated. There are many exempt activities that landowners may undertake without permits. However, if you are not sure of which activities require permits near New York State regulated wetlands, please contact your regional DEC office.Wetlands are classified from Class I (which provide the most benefits) to Class IV (which provide fewer benefits). The classification is based on the work that wetlands do, such as storing flood water and providing wildlife habitat. The system for classifying wetlands is contained in regulation (6 NYCRR Part 664) and the classification of individual wetlands is determined as part of the jurisdictional determination process.View Dataset on the GatewayFor additional information on NYS Freshwater Wetlands, see DEC's website (https://dec.ny.gov/nature/waterbodies/wetlands/freshwater-wetlands-program).For information on wetlands inside the Adirondack Park, please contact the Adirondack Park Agency.For information on wetlands regulated under federal law, please contact the United State Army Corps of Engineers.

State designated Wetlands as compiled by NYS Department of Environmental Conservation. This coverage provides a definitive inventory of state designated Wetlands (greater than 12.4 acres) in Westchester County. Coverage is based on official New York State Freshwater Wetlands Maps as described in Article 24-0301 of the Environmental Conservation Law. Coverages are not, however, a legal substitute for the official maps. For more information go to the NYSDEC website, http://www.dec.state.ny.us.

This dataset contains data regarding landfills, clipped to the Mohawk River Watershed. It is intended to provide a faithful representation of official New York State regulatory freshwater wetlands maps for GIS resource analysis at scales equal to the 1 to 24,000 scale of original mapping or smaller scales (e.g., 1 to 100,000 scale). The wetlands database is part of a larger database designed to help evaluate watershed/wetland relationships and provide data for cumulative impact assessments. The outreach efforts to share the Agency's natural resource database will encourage resource appreciation and wise use, particularly in a regional context. This data was collected by Stone Environmental, Inc. for the New York State Department of State with funds provided under Title 11 of the Environmental Protection Fund. These data are a set of ARC/INFO coverages composed of polygonal and linear features. Coverages are based on official New York State Freshwater Wetlands Maps as described in Article 24-0301 of the Environmental Conservation Law. Coverages are not, however, a legal substitute for the official maps. Coverages are available on a county basis for all areas of New York State outside the Adirondack Park.APA Wetlands: A set of 18 USGS 7.5' quadrangle-based wetland coverages was prepared for the Oswegatchie-Black, Upper Hudson, and St. Regis River watersheds, primarily within the New York State Adirondack Park (Table 1) using PC Arc/Info 3.4D+ at the Remote Sensing Laboratory, Plattsburgh State University (RSL). Wetlands were delineated on 1:40000 color infrared NAPP transparencies (for the Oswegatchie-Black watershed 1:58,000-scale NHAP color infrared photos were used), transferred to orthophoto overlays using an Image Interpretations Systems Stereo Zoom Transfer Scope, and either hand digitized or scanned into PC Arc/Info format. A digital file extracted from the watershed data layer defined the outer boundary of the mapped area. This wetlands database consists of both polygon and linear features labeled using National Wetlands Inventory conventions. The 138 individual quadrangle files were exported to the New York State, Executive Department, Adirondack Park Agency (NYS APA) running Arc/Info version 8.0. The final MAPJOINED study area polygon coverage comprised of the 18 quad coverages was called STREGWTLND.Mohawk River Watershed Processing: Data was collected from NYDEC or Adirondack Park Agency. All wetland data for Mohawk River Watershed counties were merged and projected to UTM 18N, NAD83. Wetlands were buffered 100 feet using the buffer tool.View Dataset on the Gateway

NYDEC Wetlands: This dataset is intended to provide a faithful representation of official New York State regulatory freshwater wetlands maps for GIS resource analysis at scales equal to the 1 to 24,000 scale of original mapping or smaller scales (e.g., 1 to 100,000 scale). APA Wetlands: The wetlands database is part of a larger database designed to help evaluate watershed/wetland relationships and provide data for cumulative impact assessments. The outreach efforts to share the Agency's natural resource database will encourage resource appreciation and wise use, particularly in a regional context. Mohawk River Processing: This data was collected by Stone Environmental, Inc. for the New York State Department of State with funds provided under Title 11 of the Environmental Protection Fund. These data are a set of ARC/INFO coverages composed of polygonal and linear features. Coverages are based on official New York State Freshwater Wetlands Maps as described in Article 24-0301 of the Environmental Conservation Law. Coverages are not, however, a legal substitute for the official maps. Coverages are available on a county basis for all areas of New York State outside the Adirondack Park.APA Wetlands: A set of 18 USGS 7.5' quadrangle-based wetland coverages was prepared for the Oswegatchie-Black, Upper Hudson, and St. Regis River watersheds, primarily within the New York State Adirondack Park (Table 1) using PC Arc/Info 3.4D+ at the Remote Sensing Laboratory, Plattsburgh State University (RSL). Wetlands were delineated on 1:40000 color infrared NAPP transparencies (for the Oswegatchie-Black watershed 1:58,000-scale NHAP color infrared photos were used), transferred to orthophoto overlays using an Image Interpretations Systems Stereo Zoom Transfer Scope, and either hand digitized or scanned into PC Arc/Info format. A digital file extracted from the watershed data layer defined the outer boundary of the mapped area. This wetlands database consists of both polygon and linear features labeled using National Wetlands Inventory conventions. The 138 individual quadrangle files were exported to the New York State, Executive Department, Adirondack Park Agency (NYS APA) running Arc/Info version 8.0. The final MAPJOINED study area polygon coverage comprised of the 18 quad coverages was called STREGWTLND.Mohawk River Watershed Processing: Data was collected from NYDEC or Adirondack Park Agency. All wetland data for Mohawk River Watershed counties were merged and projected to UTM 18N, NAD83. Wetlands were buffered 100 feet using the buffer tool.View Dataset on the Gateway

These data are a set of ARC/INFO coverages composed of polygonal and linear features. Coverages are based on official New York State Freshwater Wetlands Maps as described in Article 24-0301 of the Environmental Conservation Law. Coverages are not, however, a legal substitute for the official maps. Coverages are available on a county basis for all areas of New York State outside the Adirondack Park.

description: These data are a set of ARC/INFO coverages composed of polygonal and linear features. Coverages are based on official New York State Freshwater Wetlands Maps as described in Article 24-0301 of the Environmental Conservation Law. Coverages are not, however, a legal substitute for the official maps. Coverages are available on a county basis for all areas of New York State outside the Adirondack Park.; abstract: These data are a set of ARC/INFO coverages composed of polygonal and linear features. Coverages are based on official New York State Freshwater Wetlands Maps as described in Article 24-0301 of the Environmental Conservation Law. Coverages are not, however, a legal substitute for the official maps. Coverages are available on a county basis for all areas of New York State outside the Adirondack Park.

These data are a set of ARC/INFO coverages composed of polygonal and linear features. Coverages are based on official New York State Freshwater Wetlands Maps as described in Article 24-0301 of the Environmental Conservation Law. Coverages are not, however, a legal substitute for the official maps. Coverages are available on a county basis for all areas of New York State outside the Adirondack Park.

Digital wetlands data are intended for use with base maps and digital aerial photography at a scale of 1:12,000 or smaller. Due to the scale, the primary intended use is for regional and watershed data display and analysis, rather than specific project data analysis. The map products were neither designed nor intended to represent legal or regulatory products. Due to the quantity and complexity of the wetlands data the wetlands only display at 1:250,000 scale and greater. For wetland information visit: https://www.fws.gov/program/national-wetlands-inventoryView Dataset on the Gateway

These data are a set of ARC/INFO coverages composed of polygonal and linear features. Coverages are based on official New York State Freshwater Wetlands Maps as described in Article 24-0301 of the Environmental Conservation Law. Coverages are not, however, a legal substitute for the official maps. Coverages are available on a county basis for all areas of New York State outside the Adirondack Park. The coverage for Seneca County incorporates proposed wetland amendments which became the official regulatory wetland boundaries as of January 9, 2008.

This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the conterminous United States. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979).

Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery.

By policy, the Service also excludes certain types of "farmed wetlands" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition. Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps.

This data is hosted at, and may be downloaded or accessed from PASDA, the Pennsylvania Spatial Data Access Geospatial Data Clearinghouse http://www.pasda.psu.edu/uci/DataSummary.aspx?dataset=1456

These data are a set of ARC/INFO coverages composed of polygonal and linear features. Coverages are based on official New York State Freshwater Wetlands Maps as described in Article 24-0301 of the Environmental Conservation Law. Coverages are not, however, a legal substitute for the official maps. Coverages are available on a county basis for all areas of New York State outside the Adirondack Park.

This dataset depicts 100 foot buffers of wetlands regulated by the New York State Freshwater Wetlands Act. It does not contain buffers of wetlands regulated by other jurisdictions or unregulated wetlands, nor does it contain buffers of tidal wetlands regulated by New York State under the Tidal Wetlands Act (ECL Article 25).An important feature of the official NYS wetland maps is that the lines indicate only "the approximate location of the actual boundaries of the wetlands" (ECL Section 24-0301(3)). Therefore, the buffers represented in this dataset should also be considered approximate. For a final determination of the actual location of a wetland and the 100 foot regulatory area surrounding it, it is necessary to contact the NYSDEC office for the region in which the wetland occurs.Columbia County is in Region 4.

Tidal wetlands in New York State are found on the Hudson River from the Troy Dam south to the southern tip of Staten Island, and along the entire shoreline of Long Island, including the shorelines of Gardiners Island, Shelter Island and Fishers Island.Service layer is updated as needed and was last updated 4/21/23.For more information see https://www.dec.ny.gov/lands/4940.html1. The NYS DEC asks to be credited in derived products.2. Secondary Distribution of the data is not allowed.3. Any documentation provided is an integral part of the data set. Failure to use the documentation in conjunction with the digital data constitutes misuse of the data.4. Although every effort has been made to ensure the accuracy of information, errors may be reflected in the data supplied. The user must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions.

The Major Regions of NYS Productive Vernal Pools layer provides the boundaries for the five major regions of New York State corresponding with the Productive Vernal Pools regional productivity criteria presented under 6 NYCRR Part 664(g).