Dataset Identification:
Resource Abstract:
- description: 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.; abstract: 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.
Citation
- Title National Wetlands Inventory - Wetlands.
-
- creation Date
2018-06-08T09:15:29.683793
Resource language:
Processing environment:
Back to top:
Metadata data stamp:
2018-08-06T19:35:34Z
Resource Maintenance Information
- maintenance or update frequency:
- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-06T19:35:34Z
Metadata contact
-
pointOfContact
- organisation Name
CINERGI Metadata catalog
-
- Contact information
-
-
- Address
-
- electronic Mail Address cinergi@sdsc.edu
Metadata language
eng
Metadata character set encoding:
utf8
Metadata standard for this record:
ISO 19139 Geographic Information - Metadata - Implementation Specification
standard version:
2007
Metadata record identifier:
urn:dciso:metadataabout:720fd988-cb9d-41d5-8288-6977d0a227ec
Metadata record format is ISO19139 XML (MD_Metadata)