Montana Subbasin (4th-code) Hydrologic Units

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Montana Natural Resources Conservation Service State Office

Publication_Date: 2006

Title: Montana Subbasin (4th-code) Hydrologic Units

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Bozeman, Montana

Publisher: Montana Natural Resources Conservation Service

Online_Linkage: <http://nris.mt.gov/nsdi/nris/shape/subbasin24k.zip>

Online_Linkage: <http://nris.mt.gov/mapper>

Online_Linkage: <http://nris.mt.gov/bundler>

Description:

Abstract:

This data set is a hydrologic unit boundary layer to the Sub-basin (8-digit) 4th level for the State of Montana. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "FGDC Proposal, Version 2.0 - Federal Standards For Delineation of Hydrologic Unit Boundaries 10/01/04" (<http://www.ftw.nrcs.usda.gov/huc_data.html>). Polygons are attributed with hydrologic unit codes for 4th level sub-basins, name, size, downstream hydrologic unit, and non-contributing areas.

This layer was derived by dissolving the internal boundaries of 6th level watersheds to form 4th level units. The majority of this metadata describes the creation of the 6th level watersheds.

New data was not available for the Lower Kootenai River or Moyie River Sub-Basins. The data for these basins was copied from the old, 1:100,000 fifth-code HUC layer, described at <http://nris.mt.gov/nsdi/nris/hd109.html>.

Purpose:

This data set is intended to be used as a tool for water-resource management and planning activities, particularly for site-specific and localized studies requiring a level of detail provided by large-scale map information. The dataset will be appended to a larger seamless nationally consistant geospatial database as other states complete their portion of the watershed boundary dataset.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2006

Currentness_Reference: Publication date of sources

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -116.413582

East_Bounding_Coordinate: -102.791553

North_Bounding_Coordinate: 49.173993

South_Bounding_Coordinate: 43.764268

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: inlandWaters

Theme_Keyword: elevation

Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: HUC

Theme_Keyword: Hydrologic Units

Theme_Keyword: Hydrologic Unit Code

Theme_Keyword: Region

Theme_Keyword: Sub-region

Theme_Keyword: Basin

Theme_Keyword: Sub-basin

Theme_Keyword: Watershed

Theme_Keyword: Watershed Boundaries

Theme_Keyword: boundaries

Theme_Keyword: Subwatershed

Theme_Keyword: WBD

Theme_Keyword: Watershed Boundary Dataset

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Montana

Place_Keyword: Missouri River

Place_Keyword: Columbia River

Place_Keyword: South Saskatchewan River

Access_Constraints: None

Use_Constraints:

The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor and not indirectly through other sources which may have changed the data in some way. These data should not be used at scales greater than 1:24,000 for the purpose of identifying hydrographic watershed boundary feature locations in Montana. The Natural Resource Conservation Service should be acknowledged as the data source in products derived from these data. The Montana Watershed Boundary Dataset is public information and may be interpreted by all 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 result in 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 from the source distributor.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Montana Natural Resources Conservation Service

Contact_Person: Tom Potter

Contact_Address:

Address_Type: mailing address

Address: 10 E Babcock, Fed Bldg Rm 443

City: Bozeman

State_or_Province: Montana

Postal_Code: 59715

Contact_Voice_Telephone: 406-587-6968

Contact_Electronic_Mail_Address: thomas.potter@mt.usda.gov

Contact_Instructions: Please email questions and requests.

Data_Set_Credit:

Funding for the Montana Watershed Boundary Dataset (WBD) was provided by the Natural Resources Conservation Service, the U.S. Forest Service, and the Montana Natural Resource Information System (NRIS). Representatives from all three organizations contributed a substantial amount of time and salary towards quality review of the dataset.

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 9.1.0.780

Data_Quality_Information:

Logical_Consistency_Report:

The layer is topologically correct in that there are no overlaps or gaps between the polygons. The line feature coordinates of the accompanying hydrologic unit boundary layers are identical to the coordinates of the polygons they form boundaries of.

Completeness_Report:

All hydrologic units of Montana except for the Moyie River and Lower Kootenai basins are included.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The WBD was produced using Enhanced Digital Raster Graphics (DRG-Es) digital images as source map. Data completeness for DRG files reflect content of the source graphic and may therefore be reflected in the completeness and accuracy of the WBD. The map was digitized from USGS 1:24,000-scale digital raster graphic base maps, with an inherited error of +/- 40 feet according to USGS National Map Accuracy Standards. Digitized line locations were held to the +/- 40 foot accuracy standards by ensuring that all lines were within a 12 meter buffer of where visual interpretion put the actual boundary. Any lines outside the buffer were corrected. It is estimated that the errors detected were less than 10%. It should be noted that while general rules of hydrology were used (i.e. water flows downhill), the location of boundaries is still somewhat subjective as the 1:24,000-scale DRG-E do not always provide enough information for identifying the location of the boundaries. In these instances group consensus was used. Please refer to the methods section for more details on watershed delineation rules. As with the original DRGs, DRG-E is cast in the Universal Transverse Mercator projection and is referenced to the NAD27 datum. When the drg-es are used in the NAD83 datum the alternate world files only approximate the NAD83 by shifting the coordinates of the imagery. The total error introduced using this shift is less than 2 meters for all DRG-E imagery.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Montana Natural Resources Conservation Service State Office

Publication_Date: 2006

Title: Montana Subwatershed (6th-code) Hydrologic Units

Publication_Information:

Publication_Place: Bozeman, MT

Publisher: U.S. Natural Resources Conservation Service

Online_Linkage: <http://nris.mt.gov/nsdi/nris/subwatershed.html>

Source_Scale_Denominator: 24000

Source_Contribution: The data was derived from this source.

Process_Step:

Process_Description:

Dissolve 6th-code hydrologic unit polygons on the HUC_8 field to form 4th-code hydrologic units. Assign values to the Name, States, and Downstream database fields.

Process_Date: 200611

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Gerry Daumiller

Contact_Organization: Montana State Library

Contact_Voice_Telephone: 406-444-5358

Contact_Electronic_Mail_Address: gdaumiller@mt.gov

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: 100

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert Conformal Conic

Lambert_Conformal_Conic:

Standard_Parallel: 45.000000

Standard_Parallel: 49.000000

Longitude_of_Central_Meridian: -109.500000

Latitude_of_Projection_Origin: 44.250000

False_Easting: 600000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: .01

Ordinate_Resolution: .01

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Huc4Poly

Entity_Type_Definition: watershed polygons

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute:

Attribute_Label: AREA

Attribute_Definition: Area of feature in square meters.

Attribute:

Attribute_Label: PERIMETER

Attribute_Definition: Perimeter of feature in meters.

Attribute:

Attribute_Label: HUC4DISS_

Attribute_Definition:

Internal feature number from the old 1:100,000 version of the layer, for backward compatibility

Attribute:

Attribute_Label: HUC4DISSID

Attribute_Definition:

User ID number from the old 1:100,000 version of the layer, for backward compatibility

Attribute:

Attribute_Label: FOURCODE

Attribute_Definition:

Eight Digit Hydrologic Unit Subbasin Code, numeric format

A unique 8-digit code from the USGS map series "Hydrologic Unit Maps". The same number was used in every record that pertains to a subbasin that resides within the same 8-digit sub-basin. Numbers were assigned in an upstream to downstream fashion. Where no downstream/upstream relationship could be determined numbers were assigned in a clockwise fashion.

Attribute:

Attribute_Label: HUC

Attribute_Definition: Eight Digit Hydrologic Unit Subbasin Code, text format

Attribute:

Attribute_Label: NAME

Attribute_Definition: Fourth Level Hydrologic Unit Name, with state abbreviation.

Attribute:

Attribute_Label: HUCNAME

Attribute_Definition:

Fourth Level Hydrologic Unit Name

A name for each 4th level hydrologic unit that relates to the major water feature within the polygon or the major water body it contributes to.

Attribute:

Attribute_Label: STATES

Attribute_Definition:

The "States" field includes the 2-digit postal code of all state(s) that the subbasin falls within.

Attribute:

Attribute_Label: HU_8_DS

Attribute_Definition:

Fourth Level Downstream Hydrologic Unit Code

This field was populated with the 8-digit code of the 4th level hydrologic unit that is receiving the majority of the flow from the subbasin. Outlets created by ditching or other artificial drainage were not considered for this field. If a HU flows across international borders, "CANADA" or "MEXICO" was used depending on which country the HU drains into. If an HU is a closed basin, this field was populated with the term "CLOSED BASIN".

Attribute:

Attribute_Label: ACRES

Attribute_Definition:

This is the area of the 4th level unit in acres, including non-contributing areas.

Attribute:

Attribute_Label: NCONTRB_A

Attribute_Definition:

Non-Contributing Area

Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing. If a non-contributing area is on the boundary between two or more hydrologic units, the non-contributing area is associated with the hydrologic unit adjacent to the low point on the boundary. This attribute should be the total of the non-contributing areas within a hydrologic unit calculated in acres.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Tom Potter

Contact_Organization: USDA Natural Resources Conservation Service

Contact_Address:

Address_Type: mailing address

Address: 10 E Babcock, Fed Bldg Rm 443

City: Bozeman

State_or_Province: Montana

Postal_Code: 59715

Country: USA

Contact_Voice_Telephone: 406-587-6968

Contact_Electronic_Mail_Address: thomas.potter@mt.usda.gov

Contact_Instructions: please e-mail with data requests.

Resource_Description: Downloadable Data

Distribution_Liability:

The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor and not indirectly through other sources which may have changed the data in some way. These data should not be used at scales greater than 1:24,000 for the purpose of identifying hydrographic watershed boundary feature locations in Montana. The USDA Natural Resources Conservation Service makes no claims for the data's suitability for other purposes. The USDA Natural Resources Conservation Service should be acknowledged as the data source in products derived from these data. The Montana Watershed Boundary Dataset is public information and may be interpreted by all 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 result in 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 from the source distributor.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

File_Decompression_Technique: zip

Transfer_Size: 10.033

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://datagateway.nrcs.usda.gov/>

Fees: none

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Montana State Library

Contact_Address:

Address_Type: mailing address

Address: PO Box 201800

City: Helena

State_or_Province: Montana

Postal_Code: 59620-1800

Country: USA

Contact_Voice_Telephone: 406-444-5354

Contact_Electronic_Mail_Address: nris@mt.gov

Resource_Description: Downloadable Data

Distribution_Liability:

No liability is assumed for the correctness or completeness of this database by the NRCS or the Montana State Library Clearinghouse. Users should read the metadata and determine if it is appropriate for their use. No warranty expressed or implied is made by the Montana State Library regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ESRI shapefile

Transfer_Size: 10.033

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://nris.mt.gov/nsdi/nris/shape/subbasin24k.zip>

Network_Resource_Name: <http://nris.mt.gov/gis/mapper>

Network_Resource_Name: <http://nris.mt.gov/gis/bundler>

Fees: none

Metadata_Reference_Information:

Metadata_Date: 20061011

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Tom Potter

Contact_Organization: USDA-NRCS

Contact_Address:

Address_Type: mailing address

Address: 10 E Babcock, Fed Bldg Rm 443

City: Bozeman

State_or_Province: MT

Postal_Code: 59715

Country: USA

Contact_Voice_Telephone: 406-587-6968

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