Tuesday, October 22, 2013 12:42:00 PM

National Wetland Inventory Coverage

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Fish & Wildlife Service, National Wetlands Inventory
Publication_Date: unknown
Title:
National Wetlands Inventory - Nebraska
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: St.Petersburg, Florida
Publisher: U.S. Fish & Wildlife Service, National Wetlands Inventory
Online_Linkage: http://dnr.nebraska.gov/data
Online_Linkage: national-wetlands-inventory-metadata
Online_Linkage: national-wetlands-inventory-legend
Description:
Abstract:
NWI digital data files are records of wetlands location and classification as developed by the U.S. Fish & Wildlife Service.  The classification system was adopted as a national classification standard in 1996 by the Federal Geographic Data Committee. This dataset is one of a series available in 7.5 minute by 7.5 minute blocks containing ground planimetric coordinates of wetlands point, line, and polygon features and wetlands attributes. When completed, the series will provide coverage for all of the contiguous United States, Hawaii,  Alaska, and U.S. protectorates in the Pacific and Caribbean.  Coverage includes both digital data and hardcopy maps. The NWI maps do not show all wetlands since the maps are derived from aerial photointerpretation with varying limitations due to scale, photo quality, inventory techniques, and other factors.  Consequently, the maps tend to show wetlands that are readily   photointerpreted given consideration of photo and map scale. In general, the older NWI maps prepared from 1970s-era black and white photography (1:80,000 scale) tend to be very conservative, with many forested and drier-end emergent wetlands (e.g., wet meadows) not mapped. Maps derived from color infrared photography tend to yield more accurate results except when this photography was captured during a dry year, making wetland identification equally difficult. Proper use of NWI maps therefore requires knowledge of the inherent limitations of this mapping. It is suggested that users also consult other information to aid in wetland detection, such as U.S. Department of Agriculture soil survey reports and other wetland maps that may have been produced by state and local governments, and not rely solely on NWI maps. See section on "Completeness_Report"  for more information. Also see an article in the National  Wetlands Newsletter (March-April 1997; Vol. 19/2, pp. 5-12) entitled "NWI Maps: What They Tell Us" (a free copy of this article can be ordered from U.S. Fish and Wildlife Service, ES-NWI, 300 Westgate Center Drive, Hadley, MA 01035, telephone, 413-253-8620).
Purpose:
The data provide consultants, planners, and resource managers with information on wetland location and type. The data were collected to meet U.S. Fish & Wildlife Service's mandate to map the wetland and deepwater habitats of the United States. The purpose of this survey was not to map all wetlands and deepwater habitats of the United States, but rather to use aerial photointerpretation techniques to produce thematic maps that show, in most cases, the larger ones and types that can be identified by such techniques. The objective was to provide better geospatial information on wetlands than found on the U.S. Geological Survey topographic maps. It was not the intent of the NWI to produce maps that show exact wetland boundaries comparable to boundaries derived from ground surveys. Boundaries are therefore generalized in most cases. Consequently, the quality of the wetland data is variable mainly due to source photography, ease or difficulty of interpreting specific wetland types, and survey methods (e.g., level of field effort and  state-of-the-art of wetland delineation). See section on "Completeness_Report" for more information.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 197102
Ending_Date: 199212
Currentness_Reference:
source photography date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -102.046960
East_Bounding_Coordinate: -99.985135
North_Bounding_Coordinate: 42.034850
South_Bounding_Coordinate: 40.965325
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: wetlands
Theme_Keyword: hydrologic
Theme_Keyword: land cover
Theme_Keyword: surface and manmade features
Theme_Keyword: inlandWaters
Theme_Keyword: geoscientificInformation
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Nebraska Information for this element varies for each region in Nebraska only. See attached table 1-cols region and county
Access_Constraints: none
Use_Constraints:
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.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Nebraska Department of Natural Resources
Contact_Position: GIS Coordinator
Contact_Address:
Address_Type: mailing and physical address
Address:
301 Centennial Mall South
Address:
P.O. Box 94676
City: Lincoln
State_or_Province: Nebraska
Postal_Code: 68509-4676
Country: USA
Contact_Voice_Telephone: 402-471-2363
Contact_Facsimile_Telephone: 402-471-2900
Contact_Electronic_Mail_Address: dnr.gis@nebraska.gov
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.0.1770
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Exactness of the attribute is tested by manual comparison of the source with hard copy printouts and/or symbolized display
of the digital wetlands data on an interactive computer graphic system.  In addition, WAMS software (USFWS-NWI)
tests the attributes against a master set of valid wetland attributes.
Logical_Consistency_Report:
Polygons intersecting the neatline are closed along the border.  Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area.  Line segments are a set of sequentially numbered coordinate  airs.  No duplicate features exist nor duplicate points in a data string.  Intersecting lines are separated into individual line segments at the point of intersection.  Point data are represented by two sets of coordinate pairs, each with the same coordinate values.  All nodes are represented by a single coordinate pair which indicates the beginning or end of a line segment.  The neatline is generated by connecting the four corners of the digital file, as established during initialization of the digital file.  All data crossing the neatline are clipped to the neatline and data within a specified tolerance of the neatline are snapped to the neatline.  Tests for logical consistency are performed by WAMS verification software (USFWS-NWI).
Completeness_Report:
NWI maps do not show all wetlands, but attempt to show most photointerpretable wetlands given considerations of map/photo scale and wetland delineation practices. A target mapping unit (tmu) is an estimate of the size class of the smallest group of wetlands that NWI attempts to map consistently; it is not the smallest wetland mapped. Recognize that some wetland types are conspicuous and readily mapped (e.g., marshes and ponds) and smaller ones may be mapped. Drier wetlands and forested wetlands (especially evergreen) are more difficult to photointerpret and larger ones may be missed. The tmu also varies with photo scale; in forested regions, the tmu may be 3-5 acres (1:80K photos), 1-3 acres (1:58K), or 1 acre (1:40K). NWI maps should show most wetlands larger than the tmu. In the treeless prairies, a 1/4 acre tmu is possible due to the openness of terrain and occurrence of wetlands in distinct depressions. Take notice of the photo scale/type used to make the maps (see legend) and realize that black and white photos tend to yield more conservative interpretations than color infrared film. Most farmed wetlands (e.g.,  mucklands) are usually not mapped, except for pothole-type wetlands, cranberry bogs, and diked former tidelands (Sacramento Valley). Partly drained wetlands are  conservatively mapped due to photointerpretation limitations.  No attempt was made to identify regulated wetlands from  other wetlands. Recognize that maps produced through photointerpretation are not as accurate as one prepared from on-the-ground surveys, so NWI boundaries are generalized.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal accuracy for the digital data is tested by visual comparison of the source with hard copy plots.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Vertical accuracy for the digital data is tested by visual comparison of the source with hard copy plots.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Domain includes U.S. Geological Survey (USGS), U.S. Department of Agriculture (USDA), National Aeronautics and Space Administration (NASA), special project.
Publication_Date: 1992
Title:
Domain includes National Aerial Photography Program (NAPP), National High Altitude Photography (NHAP), Agricultural and Stabilization Conservation Service (ASCS), NASA or special project photography.
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 20000-132000.
Type_of_Source_Media: Domain includes black and white, color infrared, or natural color aerial photograph film transparency.
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 197102
Ending_Date: 199212
Source_Currentness_Reference:
photo date
Source_Citation_Abbreviation:
NWI1
Source_Contribution:
wetlands spatial and attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1992
Title:
topographic map
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
Domain includes 20,000, 24,000, 25,000, 30,000 and 62,500. and varies for each 7.5' quad.
Type_of_Source_Media: stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1902
Ending_Date: 1992
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
NWI2
Source_Contribution:
base cartographic data
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Fish & Wildlife Service, National Wetlands Inventory
Publication_Date: 1994
Title:
Wetlands delineations
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: St.Petersburg,Florida
Publisher: U.S. Fish & Wildlife Service, National Wetlands Inventory
Other_Citation_Details:
Domain includes 20,000, 24,000, 25,000, 30,000 and 62,500. and varies for each 7.5' quad.
Type_of_Source_Media: stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1979
Ending_Date: 1994
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
NWI3
Source_Contribution:
Wetlands location and classification
Source_Information:
Source_Citation:
Citation_Information:
Originator: and Analysis
Publication_Date: Unknown
Title:
NWI maps joined and projected
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Raleigh, North Carolina
Publisher: Analysis
Other_Citation_Details:
feet
Source_Scale_Denominator: 24000
Type_of_Source_Media: Digital files
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1979
Ending_Date: 1994
Source_Currentness_Reference:
Data conversion dates
Source_Citation_Abbreviation:
None
Source_Contribution:
Digital files were converted in projection, datum, and
measurement units, and map joined to 100 k USGS map
extents.
Process_Step:
Process_Description:
NWI maps are compiled through manual photointerpretation of NHAP or NAPP aerial photography supplemented by Soil Surveys and field checking of wetland photo signatures. Delineated wetland boundaries are manually transferred from interpreted photos to USGS 7.5 minute topographic quadrangle maps and then manually labeled. Quality control steps occur throughout the photointerpretation, map compilation, and map reproduction processes. Digital wetlands data are either manually digitized or scanned from stable-base copies of the 1:24,000 scale wetlands overlays registered to the standard U.S. Geological Survey (USGS) 7.5 minute quadrangles into topologically correct data files using Arc/Info software. Files contain ground planimetric coordinates and wetland
attributes. The quadrangles were referenced to the North  American Datum of 1927 (NAD27) horizontal datum. The scanning process captured the digital data at a scanning resolution of at least 0.001 inches; the resulting raster data were vectorized and then attributed on an interactive editing station. Manual digitizing used a digitizing table to capture the digital data at a resolution of at least 0.005 inches; attribution was performed as the data were
digitized. The determination of scanning versus manual digitizing production method was based on feature density,
source map quality, feature symbology, and availability of production systems. The data were checked for position by comparing plots of the digital data to the source material.
Source_Used_Citation_Abbreviation:
NWI1
Source_Used_Citation_Abbreviation:
NWI2
Process_Date: Unknown
Source_Produced_Citation_Abbreviation:
NWI3
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: National Wetlands Inventory
Contact_Position: Chief Cartographer
Contact_Address:
Address_Type: mailing and physical address
Address:
9720 Executive Center Drive
City: St. Petersburg
State_or_Province: Florida
Postal_Code: 33702
Country: USA
Contact_Voice_Telephone: Unknown
Contact Instructions:
US Fish  Wildlife Homepage functional
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Complete chain
Point_and_Vector_Object_Count: 34427
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 23595
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 23609
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 512
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 14
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -99.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: .61
Ordinate_Resolution: .61
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: wetpoly.pat
Entity_Type_Definition:
Wetlands are lands transitional between terrestrial and aquatic systems where the water table is usually at or near the surface or the land is covered by shallow water. For purposes of this classification wetlands must have one or more of the following three attributes: 1) at least periodically, the land supports predominantly hydrophytes; 2) the substrate is predominantly undrained hydric soil; and 3) the substrate is non-soil and is saturated with water or covered by shallow water at some time during the growing season of each year.
Entity_Type_Definition_Source:
and E. LaRoe. 1979 Classification of wetlands and depwater habitats of the United State. U.S. Fish Wildlife Service 103pp
Attribute:
Attribute_Label: FID
Attribute_Definition:
Internal feature number.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition:
Feature geometry.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Coordinates defining the features.
Attribute:
Attribute_Label: AREA
Attribute_Definition:
Area of feature in internal units squared.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition:
Perimeter of feature in internal units.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: TYPE
Attribute_Definition:
classification of the wetland
Attribute_Definition_Source:
Cowardin, L.M., V. Carter, F. Golet, and E. LaRoe. 1979.
Classification of wetlands and deepwater habitats of the
United States. U.S. Fish Wildlife Service 103 pp.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: classification of the wetland
Enumerated_Domain_Value_Definition:
See on-line link in Indentification_Information <http://www.dnr.state.ne.us/databank/metadata/nwi_legend.html>
Enumerated_Domain_Value_Definition_Source:
Carter, F. Golet, and E. LaRoe. 1979. Classification of wetlands
and deepwater habitats of ther United States. U.S. Fish Wildlife
Service. 103 pp.
Attribute:
Attribute_Label: ACRES
Attribute_Definition:
number of acres per polygon
Attribute_Definition_Source:
Nebraska Department of Natural Resources
Attribute_Domain_Values:
Unrepresentable_Domain:
each polygon represents a different acre amount.
Overview_Description:
Entity_and_Attribute_Overview:
The wetland classification system is hierarchical, with wetlands and deepwater habitats divided among five major systems at the broadest level.  The five systems include Marine (open ocean and associated coastline), Estuarine (salt marshes and brackish tidal water), Riverine (rivers, creeks, and streams), Lacustrine (lakes and deep ponds), and Palustrine (shallow ponds, marshes, swamps, sloughs).  Systems are further subdivided into subsystems which reflect hydrologic conditions.  Below the subsystem is the class which describes the appearance of the wetland in terms of vegetation or substrate.  Each class is further subdivided into subclasses; vegetated subclasses are described in terms of life form and substrate subclasses in terms of composition.  The classification system also includes modifiers to describe hydrology (water regime), soils, water chemistry (pH, salinity), and special modifiers relating to man's activities (e.g., impounded, partly
drained).
Entity_and_Attribute_Detail_Citation:
Cowardin, L.M., V. Carter, F. Golet, and E. LaRoe. 1979. Classification of wetlands and deepwater habitats of the United States. U.S. Fish Wildlife Service. 103pp.
Entity_and_Attribute_Detail_Citation:
Photointerpretation Conventions for the National Wetlands
Inventory, March 1990
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Nebraska Department of Natural Resources
Contact_Position: GIS Coordinator
Contact_Address:
Address_Type: mailing and physical address
Address:
301 Centennial Mall South, P.O. Box 94676
City: Lincoln
State_or_Province: Nebraska
Postal_Code: 68509-4676
Country: USA
Contact_Voice_Telephone: 402-471-2363
Contact_Facsimile_Telephone: 402-471-2900
Contact_Electronic_Mail_Address: dnr.gis@nebraska.gov
Resource_Description: Downloadable Data
Distribution_Liability:
none
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARC ARC/INFO Export format
Format_Version_Number: ARC/INFO 7
Format_Specification:
After the data was put in ARC/INFO Export format, we compressed the data using DOS PKZIP.  However, upon request we will output
it to another format if you are not able to use this one.
Format_Information_Content:
Spatial and attribute information
File_Decompression_Technique: PKZIP
Transfer_Size: 17.961
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://dnr.nebraska.gov
Access_Instructions:
Access the data through our web site by url http://dnr.ne.gov. Enter the Data Bank Option, Enter Spatial/GIS Data Option, Enter National Wetland Inventory and select the region you wish to access. You have the option of polygon, line or point data in Arc/Export format.
Offline_Option:
Offline_Media: CD-ROM
Recording_Capacity:
Recording_Density: 700
Recording_Density_Units: megabytes
Fees: Digital Form - The online copy of the ARC Export data set may be retrieved via web at no charge. For delivery of digital data in other formats there may be an additional charge plus the cost of the media.
Ordering_Instructions:
You can either order by leaving a message over the web site or call Nebraska Department of Natural Resources
Technical_Prerequisites:
Check NWI's ftp site, maps directory for an explanation of the wetland codes. Check NWI's ftp site, software directory for a program that will parse the wetland codes to fixed length format. Check NWI's ftp site, software directory for an AML to convert NWI DLG files to ARC/INFO coverages. NWI's ftp: 192.189.43.33
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Metadata_Reference_Information:
Metadata_Date: 20080821
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Fish & Wildlife Service, National Wetlands Inventory Center
Contact_Person: Andrew Paul
Contact_Position: Cartographer
Contact_Address:
Address_Type: mailing and physical address
Address:
9720 Executive Center Drive
Address:
P.O. Box 94676
City: St. Petersburg
State_or_Province: Florida
Postal_Code: 33702
Country: USA
Contact_Voice_Telephone: 727-570-5400
Contact_Facsimile_Telephone: 727-570-5420
Contact_Electronic_Mail_Address: Andrew_Paul@fws.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile
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