nhd_wb - National Hydrography Dataset; Medium Resolution Surface Water Body Features in New England

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:: U.S. Geological Survey in cooperation with the U.S. Environmental Protection Agency and the New England Interstate Water Pollution Control Commission
Publication_Date: 2005
Title:: nhd_wb - National Hydrography Dataset; Medium Resolution Surface Water Body Features in New England
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage: <http://nh.water.usgs.gov>

Description:

Abstract:: A nutrient water-quality model called SPARROW (Spatially Referenced Regressions on Watershed Attributes, was developed in New England by the U.S. Geological Survey in cooperation with the U.S. Environmental Protection Agency and the New England Interstate Water Pollution Control Commission. The New England SPARROW model is built upon the 1:100,000-scale National Hydrography Dataset (NHD). The NHD is a feature based database that interconnects and uniquely identifies stream segments called reaches that make up the nation's surface water drainage system. NHD contains reach codes for networked features, flow direction relationships, and centerline representations for mapped NHD 2-dimensional areal water bodies. The NHD areal water bodies data was extracted from appended NHD files to create a separate New England-wide dataset. The NHD surface water body dataset is intended to serve as a basemap layer for the New England SPARROW Viewer toolkit and other applications.
Purpose:: The National Hydrography Dataset (NHD) Surface Water Bodies GIS dataset for New England was created to provide a basemap dataset for the New England SPARROW Viewer Toolkit and other applications. For more information on NHD, go to <http://nhd.usgs.gov>.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1999

Currentness_Reference: 1999

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -74.599858
East_Bounding_Coordinate: -66.723139
North_Bounding_Coordinate: 47.429266
South_Bounding_Coordinate: 40.735045

Keywords:

Theme:

Theme_Keyword_Thesaurus: none
Theme_Keyword: Surface Water Body
Theme_Keyword: Hydrography
Theme_Keyword: NHD
Theme_Keyword: Lake
Theme_Keyword: Pond
Theme_Keyword: River
Theme_Keyword: Wetland

Place:

Place_Keyword_Thesaurus: none
Place_Keyword: United States of America
Place_Keyword: Canada
Place_Keyword: New England
Place_Keyword: Northeast
Place_Keyword: Maine
Place_Keyword: New Hampshire
Place_Keyword: Vermont
Place_Keyword: Massachusetts
Place_Keyword: Connecticut
Place_Keyword: Rhode Island
Place_Keyword: New York
Place_Keyword: Quebec
Place_Keyword: Connecticut River Basin
Place_Keyword: Lake Champlain Basin
Place_Keyword: Merrimack River Basin
Place_Keyword: Connecticut Coastal Basins
Place_Keyword: Massachusetts-Rhode Island Coastal Basins
Place_Keyword: Saco Basin
Place_Keyword: Androscoggin River Basin
Place_Keyword: Kennebec River Basin
Place_Keyword: St. Francois River Basin
Place_Keyword: Upper Hudson River Basin
Place_Keyword: Penboscot River Basin
Place_Keyword: Maine Coastal Basins
Place_Keyword: St. John River Basin

Access_Constraints: None

Use_Constraints:

Care should be used if using this dataset to tie water-related information with the NHD. It is recommended to use the original NHD files (<http://nhd.usgs.gov>) for reach addressing purposes. Deriving areas for some surface water body features from this data will require additional query operations or editing of the data as a result of quadrangle boundary and other source NHD artifacts passing thru and dividing some of the features present in the data. This dataset was developed to serve as a basemap data layer for visual recognition of features for locational purposes in the New England SPARROW Viewer Toolkit application.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Craig Johnston
Contact_Organization: U.S. Geological Survey

Contact_Position: Physical Scientist

Contact_Address:

Address_Type: mailing and physical address
Address: 361 Commerce Way
City: Pembroke
State_or_Province: New Hampshire
Postal_Code: 03275

Contact_Voice_Telephone: (603) 226-7800 ext. 7843

Contact_Facsimile_Telephone: (603) 226-7894

Contact_Electronic_Mail_Address: cmjohnst@usgs.gov

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.3.0.800

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:: The accuracy of the attributes of the source Digital Line Graph data is estimated to be 98.5 percent. One or more of the following methods were used to test attribute accuracy: manual comparison of the source with hardcopy plots; symbolized display of the digital line graph on an interactive computer graphic system; selected attributes that could not be visually verified on plots or on screen were interactively queried and verified on screen. In addition, software validated feature types and characteristics against a master set of types and characteristics, checked that combinations of types and characteristics were valid, and that types and characteristics were valid for the delineation of the feature. Feature types, characteristics, and other attributes conform to the Standards for National Hydrography All names on the high-resolution reaches were validated against a current extract from the Geographic Names Information System. The entry and identifier for the names match those in the Geographic Names Information System. The association of each name to reaches has been interactively checked, however, operator error could in some cases apply a name to a wrong reach.

Logical_Consistency_Report:

The source NHD in Arc surface water bodies exists as a set of Arc/Info regions. The medium resolution NHD, built upon U.S. Geological Survey 1:100,000-scale Digital Line Graph (DLG) data, contains artifacts of the DLG files in the data. For instance, DLG quadrangle boundaries may exist thru surface water body features where such boundaries exist in the source data. The NHD region RCH file which contains features coded as "Lake/Pond" or "Reservoir", has such quadrangle boundaries within these features removed, however, other NHD 2-dimensional surface water body features such as "Stream/River" and "Swamp/Wetland" are not present. The NHD Water Body (WB) region layer contains all the NHD 2-dimensional features with DLG quadrangle boundary artifacts present in the data. This New England Wide coverage of surface water bodies is an ARC/INFO coverage polygon feature class representation of the NHD WB region data. This data contains some of these quadrangle boundaries, which may split a feature into two or more polygons. Similarily, some NHD artificial path or stream reaches may also be present in the data, dividing some of the 2-dimensional surface water bodies into two or more features. Minimal effort was made to remove surface water body splitting arcs within the data. Only within Lake Champlain, Lake George, and Lake Memphremagog was an effort made to remove quadrangle boundary features.

Completeness_Report:

The completeness of the data reflects the content of the sources, which most often are the published USGS topographic quadrangle maps. The USGS topographic quadrangle is usually supplemented by Digital Orthophoto Quadrangles(DOQs). Features found on the ground may have been eliminated or generalized on the source map because of scale and legibility constraints. Detailed capture conditions are provided for every feature type in the Standards for National Hydrography Dataset -(USGS, 1999), available online through <http://mapping.usgs.gov/standards/>.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:: Statements of horizontal positional accuracy are based on accuracy statements made for U.S. Geological Survey topographic quadrangle maps. These maps were compiled to meet National Map Accuracy Standards. For horizontal accuracy, this standard is met if at least 90 percent of points tested are within 0.02 inch(at map scale) of the true position. Additional offsets to positions may have been introduced where feature density is high to improve the legibility of map symbols. In addition, the digitizing of maps is estimated to contain a horizontal positional error of less than or equal to 0.003 inch standard error(at map scale) in the two component directions relative to the source maps. Visual comparison between the map graphic (including digital scans of the graphic) and plots or digital displays of points, lines, and areas, is used as control to assess the positional accuracy of digital data. Digital map elements along the adjoining edges of data sets are aligned if they are within a 0.02 inch tolerance (at map scale). Features with like dimensionality (for example, features that all are delineated with lines), with or without like characteristics, that are within the tolerance are aligned by moving the features equally to a common point. Features outside the tolerance are not moved; instead, a feature of type connector is added to join the features.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: not applicable

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:: U.S. Geological Survey in in cooperation with the U.S. Environmental Protection Agency.
Publication_Date: 1999
Title: National Hydrography Dataset (NHD)
Edition: NHD in Arc
Geospatial_Data_Presentation_Form: vector digital data
Other_Citation_Details: NHD in ARC format. Not NHD Geo.
Online_Linkage: <http://nhd.usgs.gov>

Source_Scale_Denominator: 1:100,000

Type_of_Source_Media: online

Source_Citation_Abbreviation: NHD

Source_Contribution:

2-dimensional surface water body features extracted from the NHD Region WB feature class. Attributes from the NHD Region RCH data were joined to the polygon representation of the NHD Region WB features.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Natural Resources Canada
Publication_Date: 03/27/2001
Title: National Topographic Database (NTDB)
Geospatial_Data_Presentation_Form: vector digital data
Other_Citation_Details: Publication date is when data was obtained.
Online_Linkage:: <http://www.cits.rncan.gc.ca/cit/servlet/CIT/site_id=01&page_id=1-005-002-001.html>

Source_Scale_Denominator: 1:50,000

Type_of_Source_Media: disc

Source_Citation_Abbreviation: NTDB

Source_Contribution:

Canadian vector surface water bodies extracted for integration in the New England NHD for the Lake Champlain River Basin.

Process_Step:

Process_Description:

Download NHD, available by 8-digit subbasin, from NHD web site (<http://nhd.usgs.gov>). Source NHD files were projected to a common projection (Albers NAD27 meters). Lake/pond surface water body features from Natural Resources Canada 1:50,000-scale National Topographic Database (NTDB) digital vector hydrography was integrated into the NHD for the Lake Champlain Basin.

Modified NHD 8-digit hydrologic unit tiles appended to create manageable NHD workspace units similar to the U.S. Geological Survey 4-digit Hydrologic Units. NHD APPEND.AML used to append the NHD workspaces. The NHD WB Region features were converted to Arc/INFO coverages.

NHD files appended to create one New England Wide NHD surface water body dataset. The coverage was reviewed to insure that all polygon features were closed and dangling arcs removed. Selected attributes from the NHD RCH Region feature table were attached for the lake/pond and reservoir features.

Source_Used_Citation_Abbreviation: NHD

Source_Used_Citation_Abbreviation: GNIS

Process_Date: 2004

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: 61217

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 24438

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 25340

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 76

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Albers Conical Equal Area

Albers_Conical_Equal_Area:

Standard_Parallel: 29.500000
Standard_Parallel: 45.500000
Longitude_of_Central_Meridian: -71.000000
Latitude_of_Projection_Origin: 23.000000
False_Easting: 0.000000
False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.005378
Ordinate_Resolution: 0.005378

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.400000
Denominator_of_Flattening_Ratio: 294.978698

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: nhd_wb.pat
Entity_Type_Definition_Source: Polygon Attribute Table

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI