National Wetlands Inventory - Wetlands

Metadata Updated: February 22, 2019

This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). The National Wetlands Inventory - Version 2, Surface Waters and Wetlands Inventory was derived by retaining the wetland and deepwater polygons that compose the NWI digital wetlands spatial data layer and reintroducing any linear wetland or surface water features that were orphaned from the original NWI hard copy maps by converting them to narrow polygonal features. Additionally, the data are supplemented with hydrography data, buffered to become polygonal features, as a secondary source for any single-line stream features not mapped by the NWI and to complete segmented connections. Wetland mapping conducted in WA, OR, CA, NV and ID after 2012 and most other projects mapped after 2015 were mapped to include all surface water features and are not derived data. The linear hydrography dataset used to derive Version 2 was the U.S. Geological Survey's National Hydrography Dataset (NHD). Specific information on the NHD version used to derive Version 2 and where Version 2 was mapped can be found in the 'comments' field of the Wetlands_Project_Metadata feature class. 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 dataset should be used in conjunction with the Wetlands_Project_Metadata layer, which contains project specific wetlands mapping procedures and information on dates, scales and emulsion of imagery used to map the wetlands within specific project boundaries.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date January 1, 9999
Metadata Created Date December 1, 2018
Metadata Updated Date February 22, 2019
Reference Date(s) January 1, 9999 (publication)
Frequency Of Update IN CONTINUOUS INCREMENTS
Frequency Of Update IN CONTINUOUS INCREMENTS

Metadata Source

Harvested from DOI CKAN Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date January 1, 9999
Metadata Created Date December 1, 2018
Metadata Updated Date February 22, 2019
Reference Date(s) January 1, 9999 (publication)
Responsible Party U.S. Fish and Wildlife Service (Point of Contact)
Contact Email
Access Constraints Use Constraints: Acknowledgement of the U.S. Fish and Wildlife Service and (or) the National Wetlands Inventory would be appreciated in products derived from these data Although these 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., Access Constraints: None
Bbox East Long 144.600006103516
Bbox North Lat 72
Bbox South Lat 13.1700000762939
Bbox West Long -64.5500030517578
Coupled Resource
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No Restriction\"]", "metadata_type": "geospatial", "harvest_object_id": "461e4eef-a00f-44c4-82df-2f52ec9996ce", "responsible-party": "[{\"name\": \"U.S. Fish and Wildlife Service\", \"roles\": [\"pointOfContact\"]}]", "temporal-extent-end": "2017-01-01", "extras_rollup": "{\"bbox-east-long\": \"144.600006103516\", \"harvest_source_id\": \"34ce571b-cb98-4e0b-979f-30f9ecc452c5\", \"resource-type\": \"dataset\", \"bbox-north-lat\": \"72\", \"coupled-resource\": \"[]\", \"guid\": \"\", \"spatial_harvester\": \"true\", \"metadata-language\": \"\", \"spatial-reference-system\": \"\", \"graphic-preview-file\": \"\", \"spatial\": \"{\\\"type\\\": \\\"Polygon\\\", \\\"coordinates\\\": [[[-64.5500030518, 13.1700000763], [144.600006104, 13.1700000763], [144.600006104, 72.0], [-64.5500030518, 72.0], [-64.5500030518, 13.1700000763]]]}\", \"progress\": \"ONGOING\", \"spatial-data-service-type\": \"\", \"access_constraints\": \"[\\\"Use Constraints: Acknowledgement of the U.S. Fish and Wildlife Service and (or) the National Wetlands Inventory would be appreciated in products derived from these data Although these 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. 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Frequency Of Update IN CONTINUOUS INCREMENTS
Graphic Preview Description Topical overlay showing the extent and type of wetland and deepwater habitats.
Graphic Preview File
Guid
Harvest Object Id 3bc6dd58-52da-4d42-9cf9-204a29900c69
Harvest Source Id 34ce571b-cb98-4e0b-979f-30f9ecc452c5
Harvest Source Title DOI CKAN Harvest Source
Licence Although these 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. No Restriction
Metadata Language
Metadata Type geospatial
Progress ONGOING
Spatial Data Service Type
Spatial Reference System
Spatial Harvester true
Temporal Extent Begin 1977-01-01
Temporal Extent End 2017-01-01

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