National Data Sets & Information
FGDC Wetlands Mapping Standard
NWI Wetlands and Deepwater Map Code Diagram (August 2015)
Fact Sheets on Wetlands Mapping Standard:
- Digital Wetlands Data: Interagency Cooperation Fact Sheet(12/2008)
- Viewing Wetlands with Google Earth Fact Sheet (11/2008)
- Wetlands Master Geodatabase Fact Sheet (07/2007)
For FAQs, click here.
NWI+ Web Mapper and ArcGIS
National datasets of interest can be viewed and or added to the NWI+ web mapper via ArcGIS Online available through the "Search" function found in the middle-top of the page (magnifying glass symbol). These sources include NWI data, hydric soils data, national hydrography data, and hydrologic unit (watershed) boundaries.
1. "Wetlands (NWI)" - wetlands mapped by the U.S. Fish and Wildlife Service's National Wetlands Inventory Program
2. "Presence of Hydric Soil Components" (ESRI from USDA data) showing areas dominated by hydric soils, areas that are partially hydric, and areas that are predominantly non-hydric.
3. "USGS National Hydrography Data (NHD) WMS from the National Map" (U.S. Geological Survey) - geospatial data showing the location of streams and waterbodies and the boundaries and names of HUC watersheds.
Note that when NWI wetlands are viewed on top of the “Presence of Hydric Soil Components” layer, you will be able see where hydric soils have been mapped by USDA only where NWI did not identify a wetland. These may be: 1) areas that contain wetlands that escaped detection by NWI, or 2) sites that are former wetlands with potential for restoration depending on current land use. For specific sites, it may be worth checking the soils on the web soil survey for more detailed representations.
USDA NRCS Web Soil Survey
The U.S. Department of Agriculture has an online Web Soil Survey (WSS) mapping tool for identifying soils based on on-the-ground soil survey. After accessing the WSS site, read the directions, then just click on the green button and begin to locate your area of interest and the soils that have been mapped there. With this tool you can produce a map showing soils in your area of interest and also print out the acreage of the soil units in this area. You can also get official soil series descriptions and access copies of archived soil surveys. Information on hydric soils including lists, technical criteria, and the latest guide to field indicators of hydric soils can be accessed at the USDA Hydric Soils site.
Coastal & Marine Ecological Classification
NOAA Digital Coast
The Coastal and Marine Ecological Classification Standard (CMECS) provides a comprehensive national framework for organizing information about coasts and oceans and their living systems. This information includes the physical, biological, and chemical data that are collectively used to define coastal and marine ecosystems. For more information, click here.
Wetland Subcommittee of the Federal Geographic Data Committee
Implementation and Training Program Development for Federal Geographic Data Committee (FGDC) National Standards for the Mapping and Classification of Wetlands
Jane Awl (ASWM), Bill Wilen (FWS), JoAnn Mills (FWS), Elaine Blok (FWS), Larry Handley (USGS), Margarete Heber (EPA), Jeanne Christie (ASWM), John Galbraith (VTI), and Megan Lang (USDA) – SWS Presentation – July 1, 2010
Abstract: A new Federal Geographic Data Committee (FGDC) standard for mapping wetlands was accepted in July, 2009. A dynamic implementation plan for this mapping standard was released in January, 2010, and is the first such implementation plan ever developed for an FGDC standard. The full presentation is available in PDF format and may be viewed and/or downloaded by clicking here.