11 Digit Hydrologic Unit Code - Watersheds Boundaries for Upper Susquehanna River Watershed

Table of Contents



IDENTIFICATION_INFORMATION

Citation: Citation_Information: Originator: Upper Susquehanna Coalition Originator: US Geological Survey Originator: US Department of Agriculture Originator: Natural Resources Conservation Service Publication_Date: May 1, 2002 Title: 11 Digit Hydrologic Unit Code - Watersheds Boundaries for Upper Susquehanna River Watershed Edition: 1 Geospatial_Data_Presentation_Form: Map Publication_Information: Publication_Place: Horseheads, New York Publisher: Upper Susquehanna Coalition Other_Citation_Details: Original data from USGS, NRCS Online_Linkage: www.u-s-c.org/ Larger_Work_Citation: Citation_Information: Originator: Publication_Date: Title: Publication_Information: Publication_Place: Publisher: Online_Linkage: Description: Abstract: This geospatial dataset is a hydrologic unit boundary layer that is at the Subwatershed (11-digit) level for the Upper Susquehanna River Watershed. The dataset was developed from original USGS/NRCS HUC data from both Pennsylvania and New York. The dataset was developed by delineating the boundary lines on 1:24,000 base maps and digitizing the delineated lines. Digital Elevation Model data may have been used in part of the process to establish preliminary boundaries. This data set consists of geo-referenced digital map data and associated attributes. The hydrologic unit code attached to each delineated polygon is linked to the attribute data, which can contain information on the official name of the watershed and the area in acres. Purpose: The watershed and subwatershed hydrologic unit boundaries provide a uniquely identified and uniform method of subdividing large drainage areas. These smaller sized hydrologic units (up to 250,000 acres) are useful in many programs supported by the NRCS and others. The development of this dataset was due to the need for a working, seamless dataset across state lines. This data set is intended as a tool for water-resource management and planning activities, particularly for site-specific and localized studies, which require the amount of detail provided by a large-scale map. Supplemental_Information: Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: Ending_Date: Currentness_Reference: Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -77.9269 East_Bounding_Coordinate: -74.5775 North_Bounding_Coordinate: 42.9865 South_Bounding_Coordinate: 41.5970 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Waterheds Theme_Keyword: 11 Digit HUC Place: Place_Keyword_Thesaurus: None Place_Keyword: Upper Susquehanna River Access_Constraints: Upper Susquehanna Coalition Only Use_Constraints: For Internal Use Only The U.S. Department of Agriculture, Natural Resources Conservation Service, should be acknowledged as the data source in products derived from these data. These data should not be used at scales greater than 1:24,000. This is public information and may be interpreted by organizations, agencies, units of government, or others based on needs; however they are responsible for the appropriate application of the data. Federal, state, or local regulatory bodies are not to reassign to the Natural Resources Conservation Service any authority for the decisions they make. The Natural Resources Conservation Service will not perform any evaluations of these maps or purposes related solely to State or local regulatory programs. Photographic or digital enlargement of these maps to scales greater than that at which they were originally delineated can cause misrepresentation of the data. If enlarged, the maps will not include the fine detail that would be appropriate for mapping at the small scale. Digital data files are periodically updated. Files are dated, and users are responsible for obtaining the latest version of the data. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Upper Susquehanna Coalition Contact_Person: Chris Yearick Contact_Position: GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 851 Chemung Street City: Horseheads State_or_Province: New York Postal_Code: 14845 Country: USA Contact_Voice_Telephone: 607-739-2009 Contact_Facsimile_Telephone: 607-739-4392 Contact_Electronic_Mail_Address: cdy3@cornell.edu Hours_of_Service: Native_Data_Set_Environment: ArcView version 3.2 shapefile format d:\av-data\usc\huc11_020501.shp Top

DATA_QUALITY_INFORMATION

Attribute_Accuracy: Attribute_Accuracy_Report: Polygon identifiers are manually checked with the original base map using the attribute file. Verification on polygon identification continuity on each side of a neatline is done visually on the screen as adjacent quad representations are assembled into larger area data layers. Logical_Consistency_Report: Certain node/geometry and topology (GT) polygon/chain relationships are collected or generated to satisfy topological requirements. (The GT-polygon corresponds to a hydrologic unit or a portion of a hydrologic unit at the edge of a quadrangle sheet.) Some of these requirements include: chains must begin and end at nodes, left and right GT-polygons are defined for each chain element and are consistent throughout, and the chains representing the limits of the file (neatline) are free of gaps. The tests of logical consistency are performed using vendor software. The neatline is generated by connecting the explicitly entered four corners of the digital file. All data outside the enclosed region are ignored and all data crossing geographically straight lines are clipped at the neatline. Neatline straightening aligns the digitized edges of the digital data with the generated neatline (i.e., with the longitude/latitude lines in geographic coordinates). All internal polygons are tested for closure with vendor software and are checked on hard copy plots. All data are checked for common boundary lines (i.e., adjacent polygons with the same label). Quadrangles are edge matched within the Sub-basin area and edge locations generally do not deviate from centerline more than 0.01 inches. Logical_Consistency_Report: Completeness_Report: Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Horizontal Positional Accuracy Report: The accuracy of these maps is generally based on the contour information or DEM data available for the base maps. Such data may be supplemented with site visits to locate ridge lines for hydrologic unit boundaries in flat terrain areas, changes in drainage patterns due to man's activities. The differences in positional accuracy between the hydrologic unit boundaries and their digitized map locations is unknown. Hydrologic unit boundaries generally were digitized within 0.01 inches of their locations on the digitizing source. The digital map elements are edge matched against the data for the adjacent quadrangle. Edge match locations generally do not deviate from centerline to centerline by more than 0.01 inches. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Publication_Date: Title: Edition: Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Publisher: Other_Citation_Details: Online_Linkage: Larger_Work_Citation: Citation_Information: Originator: Publication_Date: Title: Publication_Information: Publication_Place: Publisher: Online_Linkage: Source_Scale_Denominator: Type_of_Source_Media: Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: Ending_Date: Source_Currentness_Reference: Source_Citation_Abbreviation: Source_Contribution: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Department of Agriculture Originator: Natural Resources Conservation Service Publication_Date: Title: Edition: Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Fort Worth, Texas Publisher: Other_Citation_Details: Derived from original USGS/NRCS HUC Data Online_Linkage: Larger_Work_Citation: Citation_Information: Originator: Publication_Date: Title: Publication_Information: Publication_Place: Publisher: Online_Linkage: Source_Scale_Denominator: Type_of_Source_Media: Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: Ending_Date: Source_Currentness_Reference: Source_Citation_Abbreviation: Source_Contribution: Process_Step: Process_Description: Source_Used_Citation_Abbreviation: Process_Date: Source_Produced_Citation_Abbreviation: Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Organization: Contact_Person: Contact_Position: Contact_Address: Address_Type: mailing and physical address Address: City: State_or_Province: Postal_Code: Country: Contact_Voice_Telephone: Contact_Facsimile_Telephone: Contact_Electronic_Mail_Address: Hours_of_Service: Top

SPATIAL_DATA_ORGANIZATION_INFORMATION

Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 94 Top

SPATIAL_REFERENCE_INFORMATION

Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 18 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -75.000000 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: Ordinate_Resolution: Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378137.0000000 Denominator_of_Flattening_Ratio: 298.26 Top

ENTITY_AND_ATTRIBUTE_INFORMATION

Overview_Description: Entity_and_Attribute_Overview: Hydrologic Unit delineations are closed polygons that encompass all area draining toward the lowest point (called pour point) in the polygon. Because of nominal sizes for the different hydrologic unit level: Watershed (40,000 to 250,000 acres) and Subwatershed (generally 10,000 to 40,000 acres), some polygons do not include all areas up to the drainage divide but all areas to one or more other upstream hydrologic units. A unique hydrologic unit code is used to identify each hydrologic unit. The hydrologic unit codes start with the 8-digit Sub-basin (sub-basin) number that contains the Watershed. Likewise the Subwatershed hydrologic unit codes start with the 11-digit Watershed number that contains the Subwatershed. HUC boundaries were joined across state lines. All data changes from original USGS coverages were coordinated with each respective County Conservation District. Some sheds had to be combined, split, or re-delineated. In a couple of cases, a watershed was split and a new HUC id number was needed. Others (especially in PA) were combined and one of the original HUC id's was chosen. Acreage was calculated by ArcView. Attributes associated with a hydrologic unit code includes: HUC_11 - 11 Digit HUC ID Number, Last4 - Last four digits of HUC, Last3b - Last 3 digits of HUC, Nameb - Watershed Name, Acres - Area in acres of watershed Entity_and_Attribute_Detail_Citation: HUC_11 - 11 Digit HUC ID Number Last4 - Last four digits of HUC Last3b - Last 3 digits of HUC Nameb - Watershed Name Acres - Area in acres of watershed Top

DISTRIBUTION_INFORMATION

Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Upper Susquehanna Coalition Contact_Person: Chris Yearick Contact_Position: GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 851 Chemung Street City: Horseheads State_or_Province: New York Postal_Code: 14845 Country: USA Contact_Voice_Telephone: 607-739-2009 Contact_Facsimile_Telephone: 607-739-4392 Contact_Electronic_Mail_Address: cdy3@cornell.edu Hours_of_Service: Resource_Description: 11 Digit HUC Watersheds forthe Upper Susquehanna (6 Digit HUC) Watershed in ArcView Shapefile Format Distribution_Liability: Top

METADATA_REFERENCE_INFORMATION

Metadata_Date: May 1, 2002 Metadata_Review_Date: Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Upper Susquehanna Coalition Contact_Person: Chris Yearick Contact_Position: GIS Coordinator Contact_Address: Address_Type: Mailing and physical address Address: 851 Chemung Street City: Horseheads State_or_Province: New York Postal_Code: 14845 Country: USA Contact_Voice_Telephone: 607-739-2009 Contact_Facsimile_Telephone: 607-739-4392 Contact_Electronic_Mail_Address: cdy3@cornell.edu Hours_of_Service: Metadata_Standard_Name: FGDC CSDGM Metadata_Standard_Version: FGDC-STD-001-1998 Top