Administrative Services

National Wetlands Inventory

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
Allegheny County Division of Computer Services Geographic Information Systems Group
Publication_Date: 2000
Title: NWI (National Wetlands Inventory)
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Publication_Information:
Publication_Place: Pittsburgh, PA
Publisher:
Allegheny County Division of Computer Services Geographic Information Systems Group
Online_Linkage:
\\GISSQL01\GISData\gisstaff\Data_Clip\Shapefiles_for_Clip\NWI.shp
Description:
Abstract:
NWI (National Wetlands Inventory) digital data files are records of wetlands location and classification as defined by the U.S. Fish & Wildlife Service. This dataset is one of a series available in 7.5 minuute by 7.5 minute blocks containing ground planimetric coordinates of wetlands point, line, and area 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. The digital data as well as the hardcopy maps that were used as the source for the digital data are produced and distributed by the U.S. Fish & Wildlife Service's National Wetlands Inventory project. This data set is derived from the national coverage and only includes the area within the boundary of Allegheny County.
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 habitiats of the United States. This data set is derived from the national coverage and only includes the area within the boundary of Allegheny County.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1992
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -89.875
East_Bounding_Coordinate: -89.75
North_Bounding_Coordinate: 30.5
South_Bounding_Coordinate: 30.375
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115.3 Topic Categories
Theme_Keyword: environment
Theme_Keyword: geoscientificInformation
Theme_Keyword: inlandWaters
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: PA
Place_Keyword: Allegheny County
Place_Keyword: Pittsburgh
Place_Keyword: Southwest PA
Place_Keyword: Clairton
Place_Keyword: McKeesport
Place_Keyword: Duquesne
Place_Keyword: Western PA
Access_Constraints: Call for Details
Use_Constraints:
All parties acknowledge that the data is for informational purposes only. The existing digital data is shipped as is and there is no guarantee as to its completeness or accuracy. Allegheny County Division of Computer Services Geographic Information Systems Group is not responsible for any reliance upon said data.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Allegheny County Division of Computer Services Geographic Information Systems Group
Contact_Position: GIS Manager
Contact_Voice_Telephone: 412 350-4774
Contact_Facsimile_Telephone: 412 350-4754
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780
Cross_Reference:
Citation_Information:
Originator:
Allegheny County Division of Computer Services Geographic Information Systems Group

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attribute accuracy 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 boundareies of a polygon tie end-to-end to completely enclose the area. Line segments are a set of sequentially numbered coordinate pairs. 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:
All photo-interpretable wetlands are mapped. In the treeless prairies, 1/4 acre wetlands are mapped. In forested areas, small open water and emergent wetlands are mapped. In general, the minimum mapping units is from 1 to 3 acres depending on the wetland type and the scale and emulsion of the source aerial photography. In regions of the country where evergreen forested wetlands predominate, wetlands smaller than 3 acres may not be mapped. Thus, a detailed on-the ground and historical analysis of a single site may result in a revision of the wetland boundaries established through photographic interpretation. In addition, some small wetlands and those obscured by dense forest cover may not be included in this dataset. The NWI maps were originally created to represent wetlands throughout the United States. Allegheny County GIS then clipped the national map data to conform to the boundary of Allegheny County. The maps were also projected to GCS_North_American_1983, NAD_1983_StatePlane_Pennsylvania_South_FIPS_3702_Feet by Allegheny County GIS.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positional accuracy for the digital data is tested by visual comparison of the source with hard copy plots.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: +/- 5 feet
Vertical_Positional_Accuracy:
Quantitative_Vertical_Positional_Accuracy_Assessment:
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 198811
Title: National High Altitude Program (NHAP)
Geospatial_Data_Presentation_Form: remote-sensing image
Other_Citation_Details:
The NWI maps were originally created to represent wetlands throughout the United States. Allegheny County GIS then clipped the national map data to conform to the boundary of Allegheny County.
Source_Scale_Denominator: 65000
Type_of_Source_Media: black and white aerial photograph film transparency
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 198811
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: NWI1a
Source_Contribution:
aerial photo from which wetlands spatial and attribute information are interpreted.
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 199010
Title: National Aerial Photography Program (NAPP)
Geospatial_Data_Presentation_Form: remote-sensing image
Other_Citation_Details:
The NWI maps were originally created to represent wetlands throughout the United States. Allegheny County GIS then clipped the national map data to conform to the boundary of Allegheny County.
Source_Scale_Denominator: 40000
Type_of_Source_Media: black and white aerial photograph film transparency
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 199010
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: NWI1b
Source_Contribution:
aerial photo from which wetlands spatial and attribute information are interpreted.
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1979
Title: Hickory
Geospatial_Data_Presentation_Form: map
Other_Citation_Details:
The NWI maps were originally created to represent wetlands throughout the United States. Allegheny County GIS then clipped the national map data to conform to the boundary of Allegheny County.
Source_Scale_Denominator: 24000
Type_of_Source_Media: stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1979
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: NWI2
Source_Contribution: base map on which wetlands delineations are registered.
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Fish & Wildlife Service, National Wetlands Inventory
Publication_Date: 1992
Title: Hickory NWI map
Geospatial_Data_Presentation_Form: map
Other_Citation_Details:
The NWI maps were originally created to represent wetlands throughout the United States. Allegheny County GIS then clipped the national map data to conform to the boundary of Allegheny County.
Source_Scale_Denominator: 24000
Type_of_Source_Media: stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1992
Source_Citation_Abbreviation: NWI3
Source_Contribution:
source material from which compiled wetlands location and classification are digitized.
Process_Step:
Process_Description:
NWI maps are compiled through manual photinterpretation 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. The NWI maps were originally created to represent wetlands throughout the United States. Allegheny County GIS then clipped the national map data to conform to the boundary of Allegheny County. The maps were also projected to GCS_North_American_1983, NAD_1983_StatePlane_Pennsylvania_South_FIPS_3702_Feet by Allegheny County GIS.
Source_Used_Citation_Abbreviation: NWI1a
Source_Used_Citation_Abbreviation: NWI1b
Source_Used_Citation_Abbreviation: NWI2
Process_Date: 1992
Source_Produced_Citation_Abbreviation: NWI3
Process_Step:
Process_Description:
During Y2K efforts of 1999-2000, data was transferred to Microsoft NT Server running ArcInfo 7 and was made available to county users across the network from a single location.
Process_Date: 2000
Process_Step:
Process_Description: Metadata Created for the Allegheny County dataset.
Process_Date: October 2006

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 777
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 1756
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 30990

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Standard_Parallel: 39.933333
Standard_Parallel: 40.966667
Longitude_of_Central_Meridian: -77.750000
Latitude_of_Projection_Origin: 39.333333
False_Easting: 1968500.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.61
Ordinate_Resolution: 0.61
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.9787

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: NWI
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:
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:
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:
Attribute_Label: PERIMETER
Attribute:
Attribute_Label: WTLNDNWI_
Attribute:
Attribute_Label: WTLNDNWI_I
Attribute_Definition:
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 descibed 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).
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:
Codeset_Domain:
Codeset_Name: USFWS-NWI wetland classification code set
Codeset_Source:
Photointerpretation Conventions for the National Wetlands Inventory, March 1990
Beginning_Date_of_Attribute_Values: March 1990
Ending_Date_of_Attribute_Values: March 1990
Attribute:
Attribute_Label: WETLAND_CL

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Allegheny County Division of Computer Services Geographic Information Systems Group
Contact_Position: GIS Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 621 County Office Building
Address: 542 Forbes Avenue
City: Pittsburgh
State_or_Province: PA
Postal_Code: 15219-2952
Country: USA
Contact_Voice_Telephone: 412 350-4774
Contact_Facsimile_Telephone: 412 350-4754
Resource_Description: Call for details.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 66.284
Ordering_Instructions: Call for Details

Metadata_Reference_Information:
Metadata_Date: 20071101
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Allegheny County Division of Computer Services Geographic Information Systems Group
Contact_Position: System Supervisor, GIS
Contact_Address:
Address_Type: mailing and physical address
Address: 621 County Office Building
Address: 524 Forbes Avenue
City: Pittsburgh
State_or_Province: PA
Postal_Code: 15219-2952
Country: USA
Contact_Voice_Telephone: 412 350-4774
Contact_Facsimile_Telephone: 412 350-4754
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

Generated by mp version 2.8.6 on Thu Nov 01 09:20:15 2007