Frequently Asked Questions
Wetlands Data
Wetlands Mapper
Program
How can I view wetland
data?
Visit our wetlands mapper.
The mapper hosts the most current digital wetlands data held
by the U.S. Fish and Wildlife Service, National Wetlands Inventory.
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Can I download
the wetlands data?
There are two methods for downloading seamless wetlands data
as viewed on the Wetlands Mapper:
- Each State data set is available for download as
either a compressed file Geodatabase or
a Shapefile.
- The Wetlands Mapper Download Data by Extent tool
uses the Wetlands Mapper to
create a ZIP file containing a compressed file Geodatabase and
a Shapefile of
the current visible extent. A web link for downloading the
file will be sent by email. This tool is available by visiting
the Wetlands Mapper, zooming to an area of interest, then
selecting the Download Data in Current Extent tool
(Tools menu).
In addition, the wetlands data may be viewed in many GIS
software applications using the Web Map Service (WMS). Instructions
on how to add the WMS layer can be found on the wetlands
WMS website.
The wetlands data can also be viewed with the Google Earth application.
Instructions on how to add the wetlands data to Google Earth
can be found on our Google
Earth web page.
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What software
do I need to view the downloaded data?
Shapefiles can be viewed using most GIS software
applications, including ESRI's free
ArcGis Explorer software. Geodatabases will require ESRI
software (version 10.*) to view.
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I have downloaded the State data
from this website, but I get an error when I try to unzip the
file.
If an error occurs during your download, or if your downloaded
file(s) is corrupted, we strongly recommend the use of a
download manager. A download manager is a computer program
dedicated to the task of downloading files from the Internet
for storage. The typical download manager at a minimum provides
means to recover from errors without losing the work already
completed.
There are several download manager programs available, including
some that are free (Free Download Manager, Orbit Downloader,
wxDownload Fast, etc.). We use wxDownload Fast and it works really
well. It is free.
Note: Due to their size, State files can not
be sent by email.
For security reasons, we are not allowed to
served data via FTP.
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How do I save
(PDF format) and print a map?
To save a map to your hard drive:
- On the wetlands mapper,
zoom to an area of interest and turn on layers of interest.
- Click on the 'Print Map' button in
the upper right hand corner of the Mapper.
- Position and scale the map in the window provided to
ensure the printed product will contain the desired area.
- Add a Title and/or Remarks in the form in the upper
right hand corner.
- Click on the Submit button.
- Wait a few seconds for the PDF to be created.
- Your computer should then pop-up a 'Save As' window
which allows you to save the PDF to your computer.
- If you wish to print your map, open the previously saved
PDF file, and select the menu item File, then
Print.
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Can I download larger
areas of wetland data?
Currently the only way to obtain the wetlands data set is
by using the Wetlands Data
download web page.
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How far do I have to
zoom in to be able to see the wetlands polygons?
Wetlands will first display at a scale of 1:144,448. The
nominal scale for viewing and using wetlands data is
1:12,000 or 1:24,000, although higher resolutions are
possible.
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How can I find out
what a wetland map code means?
Visit the Wetland Code
Interpreter and type in the case-sensitive code. For example,
entering code PUBHh will result in the wetland
explanation for Palustrine, Unconsolidated Bottom,
Permanently Flooded, Diked/Impounded wetland. Wetland Codes
are also explained in the Map
Code Legend (PDF) diagram, which outlines the classification
system by system, subsystem, class, subclass, plus modifiers.
The wetland codes are based on the National Wetlands Classification
Standards from Cowardin, L.M., V. Carter, F. Golet, and E. LaRoe.
1979. Classification
of Wetlands and Deepwater Habitats of the United States (17.4MB
PDF). U.S. Fish and Wildlife Service (Cowardin).
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What do
the four categories under Wetlands Data Availability mean?
Digital: Wetlands digital data are available and
currently being displayed on the Wetlands Mapper.
Scan: Wetlands data are available and currently being
displayed on the Wetlands Mapper as cartographic products created
from scans of the hard copy maps.
Non-Digital: Wetlands data exist for the area but are
currently not available on the Wetlands Mapper.
No Data: FWS has not mapped wetlands in these areas.
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Where can I
find metadata for wetland digital data and other data
sets displayed on the Wetlands Mapper?
Metadata information can be found on the Wetlands
Product Summary page. Metadata files for all the layers
displayed on the Wetlands mapper can be found at the
metadata web page. You can
also visit our wetlands mapper;
the mapper hosts the most current digital data and metadata
available.
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What is the intended
use of the Wetlands Mapper?
The principal focus was to produce topical wetland maps that
are graphic representations of the type, size and location of
all surface waters in the United States (wetlands and deepwater
habitats). Within this context, the objective of mapping wetlands
and deepwater habitats remains to produce reconnaissance level
information on the location, type and size of these habitats
such that they are accurate at the nominal scale of the 1:24,000
base map. The Service recognized the limitations of using remotely
sensed information as the primary data source, and additionally,
by policy, excluded some wetland types from its inventory.
See the Product Summary
web page for more information.
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Does the wetlands mapper
display all wetland polygons from the Wetlands Geodatabase?
Yes. All available wetland map data, both vector and scanned
maps, are on the Mapper.
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What are
the Areas of Interest?
This layer was designed to highlight wetlands that exhibit
unique or important ecological characteristics. It currently
includes sites located throughout the United States. It includes
Wetlands of International Importance (Ramsar sites) as well
as state natural areas, National Parks and National Wildlife
Refuges. Each site is marked with a geographic location and
includes a link to additional information about that particular
wetland. Additional site and information will be added in the
future.
This dataset is not meant to be inclusive, contains only
a small representative sample of wetland areas and will be
updated periodically.
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Is the Wetlands
Mapper the only place I can view U.S. Fish and Wildlife wetland
data?
The wetlands data may be viewed in many GIS
software applications using the Web Map Service (WMS). Instructions
on how to add the WMS layer can be found on the wetlands
WMS website. The wetlands
data can also be added to the Google Earth application using
a prepared KMZ file. Instructions on how to add the wetlands
data to Google Earth can also be found
here.
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Can the Wetlands Mapper
be used for legal or regulatory purposes regarding wetland location
or identification?
The U.S. Fish and Wildlife Service (FWS) neither designed
nor intended the National Wetlands Inventory program to produce
legal or regulatory products. Unintended use of the information
or products is discouraged. Federal, State, and local regulatory
agencies with jurisdiction over wetlands may define and describe
wetlands in a different manner than that used in this inventory.
There is no attempt, in either the design or products of this
inventory, to define the limits of proprietary jurisdiction
of any Federal, State, or local government or to establish the
geographical scope of the regulatory programs of government
agencies. Persons intending to engage in activities involving
modifications within or adjacent to wetland areas should seek
the advice of appropriate Federal, State, or local agencies
concerning specified agency regulatory programs and proprietary
jurisdictions that may affect such activities.
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How do I cite wetland
digital data or hard-copy maps in publications?
For wetland digital data downloaded from our website: U.
S. Fish and Wildlife Service. Publication date (found in
metadata). National Wetlands Inventory website. U.S.
Department of the Interior, Fish and Wildlife Service,
Washington, D.C. http://www.fws.gov/wetlands/
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When were wetlands in
my area mapped?
The Service's topical wetland and riparian maps are graphic
representations of the type, size and location of the wetlands,
deepwater or riparian habitats in the United States. These maps
have been prepared from the analysis of high altitude imagery
in conjunction with collateral data sources and field work.
The date a given wetland polygon is valid is based on the imagery
that was used for the interpretation. This imagery information
is visible when you click on a wetland polygon in the Wetlands
Mapper. A display box containing information about the selected
polygon will appear including 'Image Date(s)' which identifies
the year(s) of imagery used. For a more general view of when
the wetlands in a larger area were mapped display the' Data
Source - Image Year' layer on the Wetlands Mapper.
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When will the
maps be updated?
We are currently updating about 1% of the maps of the U.S.
on average each year concentrating on coastal and developed
areas of highest priority. Agencies and organizations interested
in becoming partners should contact the appropriate Regional
Wetlands Coordinator and visit the
contributed data web page.
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What is the map projection for State downloads and
Mapper data downloaded by extent?
State data downloaded will be in Albers
projection with a Geographic Coordinate System of North
American Datum (NAD) 1983. Mapper data downloaded
by Extent will be in Web Mercator Auxiliary Sphere
projection with a Geographic Coordinate System of
WGS 1984.
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Where can I find
the National List of Vascular Plant Species that Occur in Wetlands?
The responsibility to maintain and update the Plant List
was transferred to the U.S. Army Corps of Engineers (Memorandum
of Agreement) (PDF) (December, 2006).
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Whom do I contact when I have
a question?
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