Identification Information

Title New Mexico 6th Code Subwatersheds (12-digit)

Date 2009-07-20

Date Type Publication

Cited Responsible Party

Organization Name New Mexico Natural Resources Conservation Service State Office (NRCS)

Role identify

Presentation Form vector digital data

Abstract This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the State of New Mexico. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "FGDC Proposal, Version 1.0 - Federal Standards For Delineation of Hydrologic Unit Boundaries 3/01/02"(http://www.ftw.nrcs.usda.gov/huc_data.html). Polygons are attributed with hydrologic unit codes for 4th level sub-basins, 5th level watersheds, 6th level subwatersheds, name, size, downstream hydrologic unit, type of watershed, non-contributing areas and flow modification. Arcs are attributed with the highest hydrologic unit code for each watershed, linesource and a metadata reference file.

Purpose The Watershed and Subwatershed hydrologic unit boundaries provide a uniquely identified and uniform method of subdividing large drainage areas. The smaller sized 6th level sub-watersheds (up to 250,000 acres) are useful for numerous application programs supported by a variety of local, State, and Federal Agencies. 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.

Data Set Credit The dataset was created by the U.S. Geological Survey (USGS) in Utah, along with the U.S. Geological Survey in New Mexico, with full funding, cooperation, and oversight provided by the Natural Resources Conservation Service (NRCS) in New Mexico. All generated linework and attribution was reviewed and approved by NRCS in New Mexico along with other in state interagency partners.

Status Complete

Point of Contact

Individual Name

Organization Name New Mexico National Resource Conservation Service State Office

Position Name

Role Point of contact

Voice (505) 761-4438

Facsimile

Address

Delivery Point 6200 Jefferson NE, Suite 305
City Alburquerque
Administrative Area New Mexico
Postal Code 87109
Country

Electronic Mail Address Linda.Branch@nm.usda.gov

Maintenance and Update Frequency As needed

Descriptive Keywords HUC, Hydrologic Units, Hydrologic Unit Code, Region, Sub-region, Basin, Sub-basin, Watershed, Watershed Boundaries, boundaries, Subwatershed, WBD, Watershed Boundary Dataset

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 New Mexico. The NRCS should be acknowledged as the data source in products derived from these data. The New Mexico 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.

Language English

Topic Category inlandWaters

Extent

Geographic Bounding Box

West Bound -109.054553
East Bound -103.001961
North Bound 37.072479
South Bound 31.332172

Temporal Extent

DateTime Unknown

Data Quality Information

Attribute Accuracy Report

Report 100% of the attributes were visually verfied using 24K digital raster graphics (DRG's) The accuracy of this data is dependent on the level of detail of the source material and the interprtation procedures for capturing that source.

Quantitative Attribute Accuracy Assessment

Attribute Accuracy Value
Attribute Accuracy Explanation

Horizontal Positional Accuracy Report

Report The New Mexico WBD was produced using Digital Raster Graphics (DRG's) as the source map. Data completeness for DRG files reflects 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 the USGS National Map Accuracy Standards. It is estimated that any errors detected were less than 10%. It should also be noted that while general rules of hydrology were used (i.e. natural water flow is downhill), the locations of boundaries is still somewhat subjective as the 1:24,000-scale DRG's do not always provide enough information for identifying the location of the boundaries.

Quantitative Horizontal Positional Accuracy Assessment

Horizontal Positional Accuracy Value
Horizontal Positional Accuracy Explanation

Logical Consistency Report There are no unclosed polygons, intersections without nodes, or polygons without labels or with more than one label. Arc/Info's topological checking program CLEAN was used to correct intersections without nodes, identify unclosed polygons and remove duplicate lines with the same beginning and ending nodes. All sliver polygons were removed either using eliminate, merge or manually in ArcEdit.

Completeness Report All fields for all polygons in the .pat are attributed. Some polygons in the Ncontrb_a field might have a 0 value. All fields for the lines in the .aat are attributed. The lines adjacent to the universal polygon are attributed with a 0 for the hu_level. These cannot be attributed until the adjacent states complete their linework at which point the highest level of hydrologic unit can be determined.

Lineage

Source Information

Source Citation

Source Scale Denominator 24000

Type of Source Media online

Source Time Period of Content

DateTime 1999
Source Currentness Reference map delineation

Source Citation Abbreviation USGSDRG

Source Contribution hydrologic unit map delineation and digitize map

Source Information

Source Citation

Source Scale Denominator 30

Type of Source Media online

Source Time Period of Content

DateTime Unknown
Source Currentness Reference publication date

Source Citation Abbreviation EROS

Source Contribution ARCView coverages for creation of raster lines

Source Information

Source Citation

Source Scale Denominator 24000

Type of Source Media online

Source Time Period of Content

DateTime Unknown
Source Currentness Reference publication date

Source Citation Abbreviation USGSDOQ

Source Contribution GIS raster coverage used for reference in watershed boundary delineation

Source Information

Source Citation

Source Scale Denominator 250000

Type of Source Media online

Source Time Period of Content

DateTime Unknown
Source Currentness Reference ground condition

Source Citation Abbreviation USGS2

Source Contribution Reference for 8-digit watershed delineation

Source Information

Source Citation

Source Scale Denominator 24000

Type of Source Media online

Source Time Period of Content

DateTime Unknown
Source Currentness Reference map delineation

Source Citation Abbreviation NHD

Source Contribution GIS coverage used for reference in watershed boundary delineation

Process Step

Process Description General subwatershed boundaries were created using EDNA30. These general raster lines were used as reference lines for on-screen digitizing
Source Used Citation Abbreviation EROS
Process Date 2003
Process Time
Process Contact

Process Step

Process Description Linework was digitized to 24k map accuracy standards using the DRG's as the official base map as outlined in the standard. DOQQs were used as a reference in extreme manmade altered areas that reflected permanent change, namely along the Rio Grande. It was agreed upon initially between the NRCS and USGS that this would be the process. The resolution of all linework was completed in accordance with the National Standards for Spatial Data Accuracy (NSSDA). All 1:24,000 meter scale linework was generated digitally on screen inside of Arcmap. The initial scope of work divided the state into 6 areas for interim delivery to NRCS for review. NRCS in turn would post for in state coordinating agencies review for a pre-determined period of time. Comments on suggested edits were provided back to USGS for inclusion into the dataset after compilation and acceptance by NRCS.
Source Used Citation Abbreviation USGSDRG
Process Date 2004
Process Time
Process Contact

Process Step

Process Description Edgematching with Arizona and Utah was straight forward as those datasets are stable. At this time there was no data to edgematch with across the Mexico border. Oklahoma was coordinated with and provided their dataset which was mostly complete. Texas also provided their dataset and agreed at some juncture to extend the linework shown on the New Mexico side of the border, where the Texas portion was above the acceptable size limit for subdivision. Colorado is edgematched as closely as possible at this time. It is assumed that Colorado will dissolve out small polygons, and estimations were made as to where those would best be implemented in order to edgematch as best as possible the linework and attribution across the border. Colorado borders are not currently being work on.
Process Date 2004
Process Time
Process Contact

Process Step

Process Description Linework was digitized to 24k map accuracy standards using the DRG's as the official base map as outlined in the standard. DOQQs were used as a reference in extreme manmade altered areas that reflected permanent change, namely along the Rio Grande. It was agreed upon initially between the NRCS and USGS that this would be the process. The resolution of all linework was completed in accordance with the National Standards for Spatial Data Accuracy (NSSDA). All 1:24,000 meter scale linework was generated digitally on screen inside of Arcmap. The initial scope of work divided the state into 6 areas for interim delivery to NRCS for review. NRCS in turn would post for in state coordinating agencies review for a pre-determined period of time. Comments on suggested edits were provided back to USGS for inclusion into the dataset after compilation and acceptance by NRCS.
Source Used Citation Abbreviation USGSDOQ
Process Date 2004
Process Time
Process Contact

Process Step

Process Description Edgematching with Arizona and Utah was straight forward as those datasets are stable. At this time there was no data to edgematch with across the Mexico border. Oklahoma was coordinated with and provided their dataset which was mostly complete. Texas also provided their dataset and agreed at some juncture to extend the linework shown on the New Mexico side of the border, where the Texas portion was above the acceptable size limit for subdivision. Colorado is edgematched as closely as possible at this time. It is assumed that Colorado will dissolve out small polygons, and estimations were made as to where those would best be implemented in order to edgematch as best as possible the linework and attribution across the border. Colorado borders are not currently being work on.
Process Date 2004
Process Time
Process Contact

Process Step

Process Description Upon completion of all linework, attribution was performed statewide on the dataset by USGS in Utah, and delivered to NRCS for review and comment. Comments have been addressed and incorporated.
Process Date 2004
Process Time
Process Contact

Process Step

Process Description First draft of metadata created by kjones using FGDCMETA.AML ver. 1.2 05/14/98 on ARC/INFO data set h:\wbd\edgematching_shapefiles\final\metadata\nm\nm_hu12_geo83
Process Date 2005-08-11
Process Time
Process Contact

New Mexico 6th Code Subwatersheds (12-digit)

Metadata from the RGIS Metadata Repository

Identification Information

Distribution Information

Spatial Reference Information

Data Quality Information

Metadata Reference Information