National Wetlands Inventory (Polygons)Entry ID: MassGIS_GISDATA.NWI_POLY
Abstract: This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the Commonwealth of Massachusetts. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). The dataset was created by the National Wetlands Inventory program (http://www.fws.gov/nwi/) within the U.S. Fish & Wildlife Service. 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.
Purpose: The present goal of the Service is to provide the citizens of the United States and its Trust Territories with current geospatially referenced information on the status, extent, characteristics and functions of wetlands, riparian, deepwater and related aquatic habitats in priority areas to promote the understanding and conservation of these resources.
SUPPLEMENTAL INFORMATION: The wetland maps ... were produced as topical overlays using U.S. Geological Survey topographic maps as the base. The hard copy product is a composite map showing topographic and planimetric features from the USGS map base and wetlands and deepwater habitats from the Service's topical overlay. Thus, the data are intended for use in publications, at a scale of 1:24,000 or smaller. Due to the scale, the primary intended use is for regional and watershed data display and analysis, rather than specific project data analysis. The map products were neither designed or intended to represent legal or regulatory products. Comments regarding the interpretation or classification of wetlands or deepwater habitats can be directed to the U.S. Fish and Wildlife Service, Division of Federal Program Activities, Branch of Habitat Assessment http://www.fws.gov/duspit/contactus.htm These data were developed in conjunction with the publication Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Department of the Interior, Fish and Wildlife Service, Washington, DC. FWS/OBS-79/31. Alpha-numeric map codes have been developed to correspond to the wetland and deepwater classifications described. These spatial data are not designed to stand alone. They form topical overlays to the U.S. Geological Survey 1:24,000 or 1:25,000 scale topographic quadrangles. Note that coastline delineations were drawn to follow the extent of wetland or deepwater features as described by this project and may not match the coastline shown in other base maps. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Arc/INFO format, this metadata file may include some Arc/INFO-specific terminology.
CURRENTNESS REFERENCE: ground condition
SPATIAL DATA ORGANIZATION INFORMATION
Direct Spatial Reference: Vector
SDTS Point and Vector Object Type: G-polygon
Point and Vector Object Count: 144688
SPATIAL REFERENCE INFORMATION - PLANAR
Grid Coordinate System Name: State Plane Coordinate System 1983
SPCS Zone Identifier: 2001
Standard Parallel: 41.716667
Standard Parallel: 42.683333
Longitude of Central Meridian: -71.500000
Latitude of Projection Origin: 41.000000
False Easting: 200000.000000
False Northing: 750000.000000
Planar Coordinate Encoding Method: coordinate pair
Abscissa Resolution: 0.000006
Ordinate Resolution: 0.000006
Planar Distance Units: meters
SPATIAL REFERENCE INFORMATION - 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
NATIVE: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 184.108.40.2060
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: U.S. Fish and Wildlife Service
Dataset Title: National Wetlands Inventory (Polygons)
Dataset Series Name: Classification of Wetlands and Deepwater Habitats of the United States. U.S. DOI, Fish and Wildlife Service, Washington, DC. FWS/OBS-79/31.
Dataset Release Date: 2006-10-01
Dataset Release Place: Washington, D.C.
Dataset Publisher: U.S. Fish and Wildlife Service, Division of Habitat and Resouce Conservation
Data Presentation Form: vector digital dataOnline Resource: http://wetlandsfws.er.usgs.gov
Start Date: 1977-01-01
Vertical Resolution: 1.000000
ISO Topic Category
Quality ATTRIBUTE ACCURACY REPORT: The source data was checked using standard review procedures. Attributes were checked by using visual inspection as well as automated verification routines. Quality of the attribute information varies with age and mapping protocols used when individual maps were prepared
LOGICAL CONSISTENCY REPORT: Polygon and chain-node topology are present. Every polygon has a label.
This data set represents the extent of wetlands and deepwater habitats that can be determined with the use of remotely sensed data and within the timeframe for which the maps were produced. Wetlands are shown in all of the conterminous 48 states and the District of Columbia. The accuracy of image interpretation depends on the quality of the imagery, the experience of the image analysts, the amount and quality of the collateral data, and the amount of ground truth verification work conducted.
There is a margin error inherent in the use of imagery, thus detailed on-the-ground inspection of any particular site, may result in revision of the wetland boundaries or classification, established through image analysis.
Wetlands or other mapped features may have changed since the date or the imagery and/or field work. There may be occasional differences in polygon boundaries or classifications between the information depicted on the map and the actual conditions on site.
Access Constraints ACCESS CONSTRAINTS: None
DISTRIBUTION LIABILITY: Although these data have been processed successfully on a computer system at the U.S. Fish and Wildlife Service, no warranty expressed or implied is made by the U.S. Fish and Wildlife Service regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Fish and Wildlife Service in the use of these data.
Use Constraints USE CONSTRAINTS: None. Acknowledgement of the U.S. Fish and Wildlife Service and (or) the National Wetlands Inventory would be appreciated in products derived from these data
FEES: There is no charge for the online option. Requests for large amounts of data are handled on a cost reimbursable basis.
Data Set Progress
Distribution Size: 142.822
Distribution Format: ESRI Shapefile or Personal Geodatabase
Fees: See Use Constraints.
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: 608 783 8425
Email: tom_dahl at fws.gov
National Wetlands Inventory U.S. Fish and Wildlife Service NSST 505 Science Drive
Province or State: WI
Postal Code: 53711-1060
Creation and Review Dates
DIF Creation Date: 2007-11-01
Last DIF Revision Date: 2009-03-24