1:250,000-scale Hydrologic Units of Georgia, Florida, North Carolina and South Carolina

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: Steeves, Peter and Douglas Nebert

Publication_Date: 1994

Title:

1:250,000-scale Hydrologic Units of Georgia, Florida, North Carolina and South Carolina

Edition: 1

Geospatial_Data_Presentation_Form: Series_Name Open-file

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 94-0236

Publication_Information:

Publication_Place: Reston, Virginia

Publisher: U.S. Geological Survey

Online_Linkage: <http://water.usgs.gov/lookup/getspatial?huc250k>

Description:

Abstract:

The Geographic Information Retrieval and Analysis System (GIRAS) was developed in the mid 70s to put into digital form a number of data layers which were of interest to the USGS. One of these data layers was the Hydrologic Units. The map is based on the Hydrologic Unit Maps published by the U.S. Geological Survey Office of Water Data Coordination, together with the list descriptions and name of region, subregion, accounting units, and cataloging unit. The hydrologic units are encoded with an eight- digit number that indicates the hydrologic region (first two digits), hydrologic subregion (second two digits), accounting unit (third two digits), and cataloging unit (fourth two digits).

The data produced by GIRAS was originally collected at a scale of 1:250K. Some areas, notably major cities in the west, were recompiled at a scale of 1:100K. In order to join the data together and use the data in a geographic information system (GIS) the data were processed in the ARC/INFO GUS software package. Within the GIS, the data were edgematched and the neatline boundaries between maps were removed to create a single data set for the conterminous United States.

HUC, GIRAS, Hydrologic Units, 1:250

Purpose:

This data set was compiled originally to provide the National Water Quality Assessment (NAWQA) study units with an intermediate- scale river basin boundary for extracting other GIS data layers. The data can also be used for illustration purposes at intermediate or small scales (1:250,000 to 1:2 million). The original file was clipped to represent HUCs in Florida, Georgia, South Carolina, and North Carolina.

 

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1994

Currentness_Reference:

 

Status:

Progress: Complete

Maintenance_and_Update_Frequency:

As Needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -127.90613546

East_Bounding_Coordinate: -65.32190735

North_Bounding_Coordinate: 48.28250713

South_Bounding_Coordinate: 22.8757219

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: hydrologic unit

Theme_Keyword: watersheds

Theme_Keyword: inlandWaters

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Conterminous United States

Stratum:

Stratum_Keyword_Thesaurus: None

Stratum_Keyword: None

Temporal:

Temporal_Keyword_Thesaurus: None

Temporal_Keyword: None

Access_Constraints:

None

Use_Constraints:

These data were digitized at a scale of 1:250,000 with some portions of coverage at 1:100,000- and 1:2 million scale. Limitations of the data strictly revolve around this scale input. Use of these boundaries with larger scale data (i.e. 1:24k hydrography) is not recommended as it would be beyond the resolution capabilities of the data set.

Data_Set_Credit:

 

Security_Information:

Security_Classification_System: None

Security_Classification: Unclassified

Security_Handling_Description: None

Native_Data_Set_Environment: dgux, 5.4R3.10, AViiON UNIX, ARC/INFO version 7.0.4

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: See Entity_Attribute_Information

Quantitative_Attribute_Accuracy_Assessment:

Attribute_Accuracy_Value: See Explanation

Attribute_Accuracy_Explanation:

Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section.

Logical_Consistency_Report: Polygon and chain-node topology present.

Completeness_Report:

(Information in wordy narrative form describing omissions, selection criteria, generalization, definitions used, and other rules applied to derive the data set)

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

(An explanation of the accuracy of the horizontal coordinate measurements and a description of tests used, if any, to determine horizontal positional accuracy. This is different from horizontal resolution as reported in the DOC file. Positional accuracy defines how correctly the digital features match real-world features and woiuld be related to the concept of the National Map Accuracy Standard -- xx% of well-defined point features fall within xx units of their true position. The resolution is the smallest unit of measure the GIS can reliably manage without truncation or rounding.)

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: variable

Horizontal_Positional_Accuracy_Explanation: Resolution as reported

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

(The same as above, but for vertical information that may be encoded with the 2-D features such as cell or contour estimates of a vertical dimension. A description of the contour interval of input data and its basis could be described here.)

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Unspecified

Publication_Date: 0000

Title: Unspecified

Source_Scale_Denominator: 250,000 and 100,000

Type_of_Source_Media: Unspecified

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 0000

Source_Currentness_Reference: Unspecified

Source_Citation_Abbreviation: Unspecified

Source_Contribution: Unspecified

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point

Point_and_Vector_Object_Count: 2157

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 14841

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains

Point_and_Vector_Object_Count: 2157

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Albers Conical Equal Area

Albers_Conical_Equal_Area:

Standard_Parallel: 29.5

Standard_Parallel: 45.5

Longitude_of_Central_Meridian: -96

Latitude_of_Projection_Origin: 23

False_Easting: 0.0

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 1.0

Ordinate_Resolution: 1.0

Planar_Distance_Units: METERS

Geodetic_Model:

Horizontal_Datum_Name: Unknown

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.4

Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: HUC250.NAR

Entity_Type_Definition: HUC POLYGONS

Entity_Type_Definition_Source: GIRAS DATA

Attribute:

Attribute_Label: ' AREA'

Attribute_Definition: Area of polygon in square coverage units

Attribute_Definition_Source: Computed

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Positive real numbers

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: ' PERIMETER'

Attribute_Definition: Perimeter of polygon in coverage units

Attribute_Definition_Source: Computed

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Positive real numbers

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: HUC250#

Attribute_Definition: Internal feature number

Attribute_Definition_Source: Computed

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Sequential unique positive integer

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: HUC250-ID

Attribute_Definition: User-assigned feature number

Attribute_Definition_Source: User-defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Integer

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: ' HUC'

Attribute_Definition: HYDROLOGIC UNIT ID

Attribute_Definition_Source: GIRAS DATA

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: No restrictions

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Detailed_Description:

Entity_Type:

Entity_Type_Label: HUC250.AAT

Entity_Type_Definition: HYDROLOGIC UNIT LINEWORK

Entity_Type_Definition_Source: GIRAS DATA

Attribute:

Attribute_Label: ' FNODE#'

Attribute_Definition: Internal number of from-node

Attribute_Definition_Source: Computed

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Sequential unique positive integer

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: ' TNODE#'

Attribute_Definition: Internal number of to-node

Attribute_Definition_Source: Computed

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Sequential unique positive integer

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: ' LPOLY#'

Attribute_Definition: Internal number of polygon to left of arc

Attribute_Definition_Source: Computed

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Sequential unique positive integer

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: RPOLY#

Attribute_Definition: Internal number of polygon to right of arc

Attribute_Definition_Source: Computed

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Sequential unique positive integer

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: LENGTH

Attribute_Definition: Length of arc in coverage units

Attribute_Definition_Source: Computed

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Positive real numbers

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: HUC250#

Attribute_Definition: Internal feature number

Attribute_Definition_Source: Computed

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Sequential unique positive integer

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: HUC250-ID

Attribute_Definition: User-assigned feature number

Attribute_Definition_Source: User-defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Integer

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: SOURCE

Attribute_Definition: LINE CODING FOR UNIQUE CASES

Attribute_Definition_Source: GIRAS AND 1:2M DLG DATA

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1=100K 2=250K 3=250K EDGE 4=2MILLION DLG

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Detailed_Description:

Entity_Type:

Entity_Type_Label: HUC250.LEFTRIGHT

Entity_Type_Definition: Names of Hydrologic Cataloging Units (HUC)

Entity_Type_Definition_Source: U.S. Geological Survey, Office of Water Data Coordination

Attribute:

Attribute_Label: HUC

Attribute_Definition: Hydrologic Unit Code

Attribute_Definition_Source: U.S. Geological Survey as FIPS standard

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Integer 8-digit codes defined uniquely for each basin

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Attribute:

Attribute_Label: NAME

Attribute_Definition: Hydrologic Unit Name

Attribute_Definition_Source: U.S. Geological Survey as FIPS standard

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Integer 8-digit codes defined uniquely for each basin

Enumerated_Domain_Value_Definition: unspecified

Enumerated_Domain_Value_Definition_Source: unspecified

Overview_Description:

Entity_and_Attribute_Overview:

For definition of drainage basins, there are two principal tabular data elements of interest. The first, "HUC", stands for the Hydrologic Unit Code and includes the 8-digit cataloging unit as assigned to the basin polygon by the U.S. Geological Survey. The second item, "SOURCE", is an attribute of each bounding line segment (arc) and incorporates a code to define the source and scale of the source linework. Because this data set includes linework from different scale sources, it is important to recognize the presence and use of this item in quality evaluation.

The SOURCE item has four special codes to describe the source linework. Code 1 stands for all arcs that were from 1:100,000 scale GIRAS files and were internal to the quadrangle (no neatlines). Code 2 stands for all arcs from the 1:250,000-scale GIRAS files which were internal to the quadrangle. Code 3 is for lines from either GIRAS source scale but were part of the neatline which may be used to connect arcs that dont join cleanly between quads. Code 4 is for linework in the southern Central Valley and southern Coastal California where the GIRAS data were replaced with 1:2 million scale basin boundaries.

A companion NAMES file (HUC250.NAMES) is provided with this data set to allow a user to perform a temporary join between the basin polygons and display or query basins based on their assigned text names rather than just the basin number (HUC).

Entity_and_Attribute_Detail_Citation: Not Available

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Position: Ask USGS - Water Webserver Team

Contact_Address:

Address_Type: mailing

Address: 507 National Center

City: Reston

State_or_Province: VA

Postal_Code: 20192

Contact_Voice_Telephone: 1-888-275-8747 (1-888-ASK-USGS)

Contact_Electronic_Mail_Address:

<http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+huc250k>

Distribution_Liability:

Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.

 

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://water.usgs.gov/GIS/dsdl/huc18_250k.sdts.tgz>

Fees: None. This dataset is provided by USGS as a public service.

Metadata_Reference_Information:

Metadata_Date: 20041108

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Position: Ask USGS -- Water Webserver Team

Contact_Address:

Address_Type: mailing

Address: 507 National Center

City: Reston

State_or_Province: VA

Postal_Code: 20192

Contact_Voice_Telephone: 1-888-275-8747 (1-888-ASK-USGS)

Contact_Electronic_Mail_Address:

<http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+huc250k>

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998