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This page last updated: 04/11/2007
Metadata created using Minnesota Geographic Metadata Guidelines
| Originator | U. S. Geological Survey and U. S. Environmental Protection Agency |
| Abstract | The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. The medium-resolution NHD (scale 1:100,000) was created by merging the USGS 1:100,000 DLG linework with the USEPA RF3 (Reach File 3) attribution. NHD contains reach codes for networked features and isolated lakes, flow direction, names, stream level, and centerline representations for areal water bodies. Reaches are also defined to represent waterbodies (lakes) and the approximate shoreline of Lake Superior. Medium-resolution NHD for Minnesota is complete and available statewide. |
| Browse Graphic | none available |
| Time Period of Content Date | |
| Currentness Reference | Based on the vintage of the 1:100,000 DLG, RF3, and GNIS data available at the time of processing. See dataset specific metadata for the CU in question for more detail. |
| Access Constraints | None |
| Use Constraints | None. Acknowledgement of the originating agencies would be appreciated in products derived from these data |
| Distributor Organization | U. S. Geological Survey and U.S. Environmental Protection Agency |
| Ordering Instructions | These data sets can be obtained by USGS Cataloging Unit (DNR Major Watershed) from the USGS NHD Website at http://nhd.usgs.gov/data.html Click on the link 'Obtaining NHD Data.' This links to a web mapping application which enables you to zoom in to the area of interest, view the CU's which have been completed, view metadata, and download the zipfile containing NHD data and metadata for the CU of choice. (In the map application, make visible the layer 'Medium Res Subbasins'). There are also instructions for going directly to the ftp site and downloading data for the CU of choice. This option works if you already know the CU number. |
| Online Linkage | Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" in Section 6 of this metadata. |
Go to Section:
1. Identification Information
2. Data Quality Information
3. Spatial Data Organization Information
4. Spatial Reference Information
5. Entity and Attribute Information
6. Distribution Information
7. Metadata Reference Information
| Section 1 | Identification Information | Top of page | ||
| Originator | U. S. Geological Survey and U. S. Environmental Protection Agency | |||
| Title | National Hydrography Dataset - Medium Resolution - Minnesota | |||
| Abstract | The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. The medium-resolution NHD (scale 1:100,000) was created by merging the USGS 1:100,000 DLG linework with the USEPA RF3 (Reach File 3) attribution. NHD contains reach codes for networked features and isolated lakes, flow direction, names, stream level, and centerline representations for areal water bodies. Reaches are also defined to represent waterbodies (lakes) and the approximate shoreline of Lake Superior. Medium-resolution NHD for Minnesota is complete and available statewide. | |||
| Purpose | The National Hydrography Dataset is designed to provide comprehensive coverage of hydrologic data for the United States. The NHD is a national framework for assigning reach addresses to water-related entities, such as industrial discharges, drinking water supplies, fish habitat areas, wild and scenic rivers. Reach addresses establish the locations of these entities relative to one another within the NHD surface water drainage network much like addresses on streets. Once linked to the NHD by their reach addresses, the upstream/downstream relationships of these water-related entities--and any associated information about them--can be analyzed using software tools ranging from spreadsheets to geographic information systems (GIS). Because the NHD provides a nationally consistent framework for addressing and analysis, water-related information linked to reach addresses by one organization (national, state, local) can be shared with other organizations and easily integrated into many different types of applications. The NHD also incorporates the National Spatial Data Infrastructure framework criteria set out by the Federal Geographic Data Committee. | |||
| Time Period of Content Date | ||||
| Currentness Reference | Based on the vintage of the 1:100,000 DLG, RF3, and GNIS data available at the time of processing. See dataset specific metadata for the CU in question for more detail. | |||
| Progress | Complete | |||
| Maintenance and Update Frequency | Irregular | |||
| Spatial Extent of Data | All of the 81 USGS Cataloging Units (DNR major watersheds) have been completed for Minnesota | |||
| Bounding Coordinates | -97.5 -89.0 49.5 43.0 |
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| Place Keywords | Minnesota. Baptism-Brule; Beaver-Lester; St. Louis; Cloquet; Beartrap-Nemadji; Mississippi Headwaters; Leech Lake; Prairie-Willow; Elk-Nokasippi; Pine; Crow Wing; Redeye; Long Prairie; Platte-Spunk; Sauk; Clearwater-Elk; Crow; South Fork Crow; Twin Cities; Rum; Upper Minnesota; Pomme De Terre; Lac Qui Parle; Hawk-Yellow Medicine; Chippewa; Redwood; Middle Minnesota; Cottonwood; Blue Earth; Watonwan; Le Sueur; Lower Minnesota; Upper St. Croix; Kettle; Snake; Lower St. Croix; Rush-Vermillion; Cannon; Buffalo-Whitewater; Zumbro; LaCrosse-Pine; Root; Coon-Yellow; Upper Iowa; Upper Wapsipinicon; Upper Cedar; Shell Rock; Winnebago; Des Moines Headwaters; Upper Des Moines; East Fork Des Moines; Bois de Sioux; Mustinka; Otter Tail; Upper Red; Buffalo; Elm-Marsh; Eastern Wild Rice; Sandhill-Wilson; Red Lakes; Red Lake River; Thief River; Clearwater; Grand Marais-Red; Snake; Lower Red; Two Rivers; Roseau; Rainy Headwaters; Vermilion; Rainy Lake; Upper Rainy; Little Fork; Big Fork; Rapid; Lower Rainy; Lake of the Woods; Upper Big Sioux; Lower Big Sioux; Rock. | |||
| Theme Keywords | inlandWaters, Hydrography, Stream / River, Lake / Pond, Canal / Ditch, Reservoir, Swamp / Marsh, Artificial Flowpaths, Reach, Waterbody, Watercourse, NHD, National Hydrography Dataset | |||
| Theme Keyword Thesaurus | ISO 19115 Topic Category | |||
| Access Constraints | None | |||
| Use Constraints | None. Acknowledgement of the originating agencies would be appreciated in products derived from these data | |||
| Contact Person Information | Mark Olsen,
Minnesota Pollution Control Agency 520 Lafayette Road St. Paul, Minnesota 55155 Phone: 651-296-3412 FAX: E-mail: mark.olsen@state.mn.us | |||
| Browse Graphic | none available | |||
| Browse Graphic File Description | ||||
| Associated Data Sets | For additional project definition, background, documentation, access to both high-resolution and medium-resolution NHD data, tools, and documentation, see the USGS-NHD website at http://nhd.usgs.gov Metadata for each Cataloging Unit (CU) is provided with the downloaded data. |
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| Section 2 | Data Quality Information | Top of full metadata | Top of page | |
| Attribute Accuracy | See dataset specific metadata | |||
| Logical Consistency | See dataset specific metadata | |||
| Completeness | See dataset specific metadata | |||
| Horizontal Positional Accuracy | See dataset specific metadata | |||
| Lineage | In general, the process is as described below (from NHD website) . See the metadata record for each CU for more specific processing information. 1. Convert RF3 to RF3 double prime. This process edits Reach File version 3 to delete duplicate reaches, reassign reaches to the correct cataloging unit, validate geographic names assigned to reaches against data from the Geographic Names Information System, redelineate reaches based on the standards used for the National Hydrography Dataset, and identify inflow/outflow points where transport reaches entered and exited waterbodies. 2. Create artificial paths. Using waterbodies from the features data and inflow/outflow points extracted from RF3 double prime, this process automatically generates the lines used to delineate artificial paths within waterbodies using the ARC/INFO GRID routine. 3. Blind pass. This batch step conflates RF3 double prime reaches, and transfers reach information (reach code, reach date, name, stream level, and flow relationships), to the (DLG-based) features. It also integrates the artificial paths generated in the previous step with the other features, builds reaches on the artificial paths, and assigns geographic names to waterbodies. 4. Quadrangle-based visual pass. During this interactive step, analysts ensure that the data developed in the previous batch processes conform to reach delineation rules and that reaches are assigned to the appropriate cataloging unit. Batch procedures identify and develop a list of possible errors. Using the list, software presents each case to analysts to make appropriate edits to the data. Analysts record notes where repairs could not be made; these notes are encoded in the cataloging unit digital update units under a separate process description. 5. Build superquads. After the quadrangle-based visual pass is complete, all quadrangles that cover all or part of each cataloging unit using are paneled into a superquad. In this batch process, reaches that cross quad boundaries are corrected to conform to reach delineation rules. 6. Cataloging unit-based visual pass. Like the quadrangle-based visual pass, analysts ensure that reaches conform to reach delineation rules. Batch procedures identify and develop a list of possible errors. (Errors not detected by the software may continue in the data.) Analysts examine each error, and correct the data. Analysts record notes about repairs that could not be made, and other errors in the data; these notes are encoded in the cataloging unit digital update units under a separate process description. 7. Central quality assurance/quality control. This step (1) confirms that integrity checks are performed successfully during the visual pass activity, and (2) assesses statistics gathered during the earlier processes to determine if additional review was needed. A check of data from the cataloging unit-based visual pass is run in batch; any data that does not pass the procedure are reviewed interactively. If substantive changes are required, the data are reprocessed using procedures (as required) described in previous steps. The edited data then are rechecked using the central quality assurance/quality control process. 8. Data preparation and database load. This batch procedure performs final processing to the data emerging from the quality assurance/quality control step. Some of the activities include assigning the final reach codes, building waterbody reaches, adding final artificial paths in waterbodies, and implementing any recent changes in standards for the National Hydrography Dataset. The spelling of geographic names are replaced from a newer data extract from the Geographic Names Information System. Following this procedure, reaches, features, characteristics, geographic names, and relations are loaded into the database that holds the National Hydrography Dataset. 9. Flow relation correction and validation. The flow relations are checked for consistency through a batch procedure, which generate a list of possible errors. Software presents possible errors to analysts, who correct flow relations and, occasionally, the delineation of reaches. Changes are posted to the database. 10. Extract distribution copies of data. Data for a cataloging unit are extracted from the database, and converted into an ARC/INFO workspace containing coverages and other files related to the National Hydrography Dataset. Data available in the Spatial Data Transfer Standard format are developed from the workspaces. The workspaces, and the Spatial Data Transfer Standard-formatted files, are made available to the public. | |||
| Source Scale Denominator | 100000 | |||
| Section 3 | Spatial Data Organization Information | Top of full metadata | Top of page | |
| Native Data Set Environment | Arc/Info coverages, extracted from Oracle Database | |||
| Geographic Reference for Tabular Data | ||||
| Spatial Object Type | Vector | |||
| Vendor Specific Object Types | arc, polygon | |||
| Tiling Scheme | USGS 8-digit Hydologic Unit or Cataloging Unit (CU); these units cover same geographic area as Minnesota DNR Major Watersheds. Where a CU crosses state boundaries, the entire CU is included. | |||
| Section 4 | Spatial Reference Information | Top of full metadata | Top of page | |
| Horizontal Coordinate Scheme | Geographic (Lat. Long.) | |||
| Ellipsoid | GRS80 | |||
| Horizontal Datum | NAD83 | |||
| Horizontal Units | Decimal degrees | |||
| Distance Resolution | ||||
| Section 5 | Entity and Attribute Information | Top of full metadata | Top of page | |
| Entity and Attribute Overview | See http://nhd.usgs.gov | |||
| Entity and Attribute Detailed Citation | See http://nhd.usgs.gov/techref.html | |||
| Section 6 | Distribution Information | Top of full metadata | Top of page | |
| Publisher | United States Geological Survey and U.S. Environmental Protection Agency | |||
| Publication Date | Periodically revised | |||
| Contact Person Information | U. S. Geological Survey and U.S. Environmental Protection Agency , Phone: FAX: E-mail: nhd@usgs.gov |
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| Distributor's Data Set Identifier | nhd_100k - NHD Medium Res | |||
| Distribution Liability | ||||
| Transfer Format Name | Arc/Info coverage | |||
| Transfer Format Version Number | ||||
| Transfer Size | Varies by CU | |||
| Ordering Instructions | These data sets can be obtained by USGS Cataloging Unit (DNR Major Watershed) from the USGS NHD Website at http://nhd.usgs.gov/data.html Click on the link 'Obtaining NHD Data.' This links to a web mapping application which enables you to zoom in to the area of interest, view the CU's which have been completed, view metadata, and download the zipfile containing NHD data and metadata for the CU of choice. (In the map application, make visible the layer 'Medium Res Subbasins'). There are also instructions for going directly to the ftp site and downloading data for the CU of choice. This option works if you already know the CU number. | |||
| Online Linkage | Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" above. | |||
| Section 7 | Metadata Reference Information | Top of full metadata | Top of page | |
| Metadata Date | 04/11/2007 | |||
| Contact Person Information | Susanne Maeder,
GIS Data Coordinator Minnesota Land Management Information Center (LMIC) 300 Centennial Building; 658 Cedar Street St. Paul, Minnesota 55155 Phone: 651-201-2488 FAX: 651-296-3698 E-mail: clearing.house@state.mn.us |
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| Metadata Standard Name | Minnesota Geographic Metadata Guidelines | |||
| Metadata Standard Version | 1.2 | |||
| Metadata Standard Online Linkage | http://www.lmic.state.mn.us/gc/stds/metadata.htm | |||
This page last updated: 04/11/2007