Metadata

fox-bnd-huc12

Frequently-asked questions:

What does this data set describe?
Title:
fox-bnd-huc12

Abstract:

This geospatial dataset is the Fox watershed boundary derived from the Illinois HUC12 (ilhuc12geo83) hydrologic unit boundary layer which 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 area in acres, non-contributing area, state(s) the HU falls within, name for 5th and 6th level HU, 5th and 6th level code for downstream hydrologic unit, and hydrologic unit modifications. Each line has attributes that describe the HU level (1-6), originating source for that line and a metadata ID number that links the line to its associated metadata file.


  1. How should this data set be cited?

    U. S. Department of Agriculture, Natural Resources Conservation Service, 2002, fox-bnd-huc12: U. S. Department of Agriculture, Natural Resources Conservation Service, Fort Worth, Texas.

  2. What geographic area does the data set cover?

    Bounding coordinates:
    West: -89.092786
    East: -88.034141
    North: 42.503011
    South: 41.336246

  3. What does it look like?

    N/A (N/A)
    N/A

  4. Does the data set describe conditions during a particular time period?

    Calendar date: 2002
    Currentness reference:

    publication date


  5. What is the general form of this data set?

    Geospatial data presentation form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (1)
      • Label point (1884)
      • GT-polygon composed of chains (1966)
      • Point (4)

    2. What coordinate system is used to represent geographic features?

      The map projection used is Lambert Conformal Conic.

      Projection parameters:
      Standard parallel: 33.000000
      Standard parallel: 45.000000
      Longitude of central meridian: -89.500000
      Latitude of projection origin: 33.000000
      False easting: 2999994.000000
      False northing: 0.000000

      Planar coordinates are encoded using coordinate pair.
      Abscissae (x-coordinates) are specified to the nearest 0.001024.
      Ordinates (y-coordinates) are specified to the nearest 0.001024.
      Planar coordinates are specified in survey feet.

      The horizontal datum used is D_Clarke_1866.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

    fox-bnd-huc12

    Attributed arcs of hydrologic unit polygons

     (Source:

    U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.

    )

    FID

    Internal feature number.

     (Source:

    ESRI

    )

    Sequential unique whole numbers that are automatically generated.

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    Shape

    Feature geometry.

     (Source:

    ESRI

    )

    Coordinates defining the features.

    HU_10_TYPE

    Internal node number for the beginning of an arc (from-node).

     (Source:

    ESRI

    )

    Whole numbers that are automatically generated.

    Cnt_HU_10_

    Internal node number for the end of an arc (to-node).

     (Source:

    ESRI

    )

    Whole numbers that are automatically generated.

    Sum_ACRES

    Internal node number for the left polygon.

     (Source:

    ESRI

    )

    Whole numbers that are automatically generated.

    RPOLY#

    Internal node number for the right polygon.

     (Source:

    ESRI

    )

    Whole numbers that are automatically generated.

    LENGTH

    Length of feature in internal units.

     (Source:

    ESRI

    )

    Positive real numbers that are automatically generated.

    IL_HU12_GEO83#

    Internal feature number.

     (Source:

    ESRI

    )

    Sequential unique whole numbers that are automatically generated.

    IL_HU12_GEO83-ID

    User-defined feature number.

     (Source:

    ESRI

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_LEVEL

    The highest hydrologic unit level (smallest number) for the line (arc) represented by the record

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    LINESOURCE

    The base map source(s) used to delineate at 1:24,000 scale

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    META_ID

    Metadata ID is a code that identifies which metadata file applies to the arc

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_10_DS
    HU_10_NAME
    HU_10_MOD
    HU_10_TYPE
    HU_12_DS
    HU_12_NAME
    HU_12_MOD
    HU_12_TYPE
    il_hu12_geo83.pat

    polygons identify watershed boundaries

     (Source:

    U.S. Department of Agriculture. 2001. Federal Standards for

    )

    FID

    Internal feature number.

     (Source:

    ESRI

    )

    Sequential unique whole numbers that are automatically generated.

    Shape

    Feature geometry.

     (Source:

    ESRI

    )

    Coordinates defining the features.

    AREA

    Area of feature in internal units squared.

     (Source:

    ESRI

    )

    Positive real numbers that are automatically generated.

    PERIMETER

    Perimeter of feature in internal units.

     (Source:

    ESRI

    )

    Positive real numbers that are automatically generated.

    IL_HU12_GEO83#

    Internal feature number.

     (Source:

    ESRI

    )

    Sequential unique whole numbers that are automatically generated.

    IL_HU12_GEO83-ID

    User-defined feature number.

     (Source:

    ESRI

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HUC_8

    A unique 8-digit code from the USGS map series "Hydrologic Unit Maps". The same number should be used in every record that pertains to a subwatershed that resides within the same 8-digit sub-basin.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HUC_10

    This field provides a unique 10-digit code for each watershed. Add two digits to the end of the existing 8-digit code, therefore resulting in a 10-digit number. This same number should be used in every record that pertains to a subwatershed that resides within the same 10-digit watershed.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Sequential unique whole numbers that are automatically generated.

    HUC_12

    This field provides a unique 12-digit code for each subwatershed. Add two digits to the end of the existing 10-digit code, therefore creating a 12-digit number.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Sequential unique whole numbers that are automatically generated.

    ACRES

    Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals. Data was projected to Albers Equal Area to calculate the acres field. Acres were calculated by dividing area by 4046.86 (This equation was provide by the NRCS-NCGC).

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    STATES

    The "States" field needs to include the names of all state(s) that the subwatershed falls within.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    NCONTRB_A

    Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing. Only isolated non-contributing areas larger than 3,000 acres were delineated and their acreage noted in this field

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_10_DS

    The 10-digit code of the 5th level hydrologic unit that is receiving the majority of the flow from the watershed that the 6th level HU falls within. Outlets created by ditching or other artificial drainage are not to be considered for this field.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_10_NAME

    A unique name for each 5th level hydrologic unit that relates to the major water feature within the polygon or the major water body it contributes to

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_10_MOD

    This field identifies interbasin transfers (IT) and dams at outlet (DM) that modify natural overland flow as Modifications are identified from most significant to least significant modification(s) and are based on a query of hydrologic units using the 1:100,000-scale National Hydrography Dataset. Hydrologic units with no modification are marked with NM.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_10_TYPE

    This field identifies the type of watershed.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Sequential unique whole numbers that are automatically generated.

    HU_12_DS

    The 12-digit code of the 5th level hydrologic unit that is receiving the majority of the flow from the watershed that the 6th level HU falls within. Outlets created by ditching or other artificial drainage are not to be considered for this field.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_12_NAME

    A unique name for each 6th level hydrologic unit that relates to the major water feature within the polygon or the major water body it contributes to

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_12_MOD

    This field identifies interbasin transfers (IT) and dams at outlet (DM) that modify natural overland flow as Modifications are identified from most significant to least significant modification(s) and are based on a query of hydrologic units using the 1:100,000-scale National Hydrography Dataset. Hydrologic units with no modification are marked with NM.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_12_TYPE

    This field identifies the type of watershed.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_12_NAME

    A unique name for each 6th level hydrologic unit that relates to the major water feature within the polygon or the major water body it contributes to

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_12_MOD

    This field identifies interbasin transfers (IT) and dams at outlet (DM) that modify natural overland flow as Modifications are identified from most significant to least significant modification(s) and are based on a query of hydrologic units using the 1:100,000-scale National Hydrography Dataset. Hydrologic units with no modification are marked with NM.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    HU_12_TYPE

    This field identifies the type of watershed.

     (Source:

    Federal Standards for Delineation of Hydrologic Unit Boundaries

    )

    Formal codeset
    Codeset name: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
    Codeset source: U.S. Department of Agriculture, Natural Resources Conservation Service

    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 10-digit Watershed number that contains the Subwatershed. Attributes associated with a hydrologic unit code includes: Huc_8, Huc_10, Huc_12, acres, states, non-contributing area (acres), Hu_10_downstream, Hu_10_name, Hu_10_mod, Hu_10_type, Hu_12_downstream, HU_12_name, HU_12_mod, Hu_12_type, Hu_level, Linesource, Meta_id.


    Entity and attribute detail citation:

    Federal Standard for Delineation of Hydrologic Unit Boundaries.

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Who produced the data set?
  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

    • U. S. Department of Agriculture, Natural Resources Conservation Service

  2. Who also contributed to the data set?

    U.S. Department of Agriculture, Natural Resources Conservation Service


  3. To whom should users address questions about the data?

    Kathleen J. Brown
    Illinois State Water Survey
    GIS Specialist

    2204 Griffith Drive

    Champaign, IL 61820-7495
    USA

    217-333-6778 (voice)
    217-333-6540 (FAX)
    katbrown@uiuc.edu
    Hours of Service: 8 - 5 Central
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Why was the data set created?

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. 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.


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How was the data set created?
  1. Where did the data come from?

    USGS1 (source 1 of 12)

    U.S. Geological Survey, Unknown, multiple 7.5 minute Digital Raster Graphics.

    Type of source media: CD-ROM
    Source scale denominator: 24000
    Source contribution:

    Base map for compilation of Hydrologic Units.


    USGS2 (source 2 of 12)

    n/a, Unknown, multiple 7.5 minute quadrangles.

    Type of source media: paper
    Source scale denominator: 24000
    Source contribution:

    Reference for delineation of watershed


    USGS3 (source 3 of 12)

    n/a, Unknown, USGS Watersheds.

    Type of source media: CD-ROM
    Source scale denominator: 24000
    Source contribution:

    Reference for watershed delineation


    IEPA (source 4 of 12)

    n/a, Unknown, IEPA Watersheds.

    Type of source media: CD-ROM
    Source scale denominator: 24000
    Source contribution:

    Reference for watershed delineation


    NRCS1 (source 5 of 12)

    n/a, Unknown, Hydrologic Units State of Illinois.

    Type of source media: paper
    Source scale denominator: 100000
    Source contribution:

    Reference for watershed delineation


    NRCS2 (source 6 of 12)

    n/a, Unknown, 11 digit hydrologic units for Illinois.

    Type of source media: CD-ROM
    Source scale denominator: 100000
    Source contribution:

    Arc/Info Coverage digital files


    NRCS3 (source 7 of 12)

    n/a, Unknown, 12 digit hydrologic units for Illinois.

    Type of source media: CD-ROM
    Source scale denominator: 24000
    Source contribution:

    Arc/Info Coverage digital files


    NRCS4 (source 8 of 12)

    n/a, Unknown, 12 digit hydrologic units for Indiana.

    Type of source media: CD-ROM
    Source scale denominator: 24000
    Source contribution:

    Arc/Info coverage for edgematching


    NRCS5 (source 9 of 12)

    n/a, Unknown, Watersheds of Wisconsin.

    Type of source media: CD-ROM
    Source scale denominator: 24000
    Source contribution:

    Arc/Info coverages for edgematching


    NRCS6 (source 10 of 12)

    n/a, Unknown, 12 digit hydrologic units for Iowa.

    Type of source media: CD-ROM
    Source scale denominator: 24000
    Source contribution:

    Arc/Info coverage for edgematching


    NRCS7 (source 11 of 12)

    n/a, Unknown, 12 digit hydrologic units for Missouri.

    Type of source media: CD-ROM
    Source scale denominator: 24000
    Source contribution:

    Arc/Infor coverage for edgematching


    NRCS8 (source 12 of 12)

    n/a, Unknown, 12 digit hydrologic units for Kentucky.

    Type of source media: CD-ROM
    Source scale denominator: 24000
    Source contribution:

    Arc/Info coverage for edgematching


  2. What changes have been made?

    Date: 2001 (change 1 of 8)

    Hydrologic units (HUs) at the 8 digit level were developed by dissolving more detailed watersheds from the US Geological Survey watershed coverage. The USGS watersheds were delineated and digitized from 7.5 minute topographic quadrangles.


    Data sources used in this process:
    • USGS2
    • USGS3

    Date: 2001 (change 2 of 8)

    Hydrologic units (HUs) at the 10 digit level were completed by using the IEPA watershed coverage as a primary source, and the Illinois NRCS 11-digit coverage as a general reference. Boundaries from the IEPA coverage defining HUs common to the NRCS coverage were selected as 10 digit arcs. HUs defined in the NRCS coverage that met the criteria of a 10 digit hydrologic unit, that were not defined in the IEPA coverage, were delineated using DRGs and Arc/Info software. Final adjustments and verification of the 10 digit boundaries were completed using DRGs and Arc/Info software.


    Data sources used in this process:
    • USGS1
    • IEPA
    • NRCS2

    Date: 2001 (change 3 of 8)

    Watershed boundaries at the 12 digit level were completed by using the IEPA watershed coverage, USGS watershed coverage and Hydrologic Units State of Illinois as references. Boundaries from watersheds of the IEPA coverage that met the specifications of a 12 digit basin were utilized as arcs in the NRCS coverage. Boundaries from watersheds of the USGS coverage that defined a basin that was to be a 12 digit HU, were selected from the USGS coverage and inserted into the NRCS 12 digit HU coverage. Additional HUs were digitized using DRGs and Arc/Info software. Hydrologic unit coverages from Indiana, Wisconsin, Iowa, Missouri and Kentucky were used to edgematch watershed boundaries. Surrounding states do not have certified hydrologic units, so edgematching is not perfect.


    Data sources used in this process:
    • USGS1
    • USGS3
    • IEPA
    • NRCS1
    • NRCS3
    • NRCS4
    • NRCS5
    • NRCS6
    • NRCS7
    • NRCS8

    Date: 2002 (change 4 of 8)

    Personnel at the NRCS National Cartography and Geospatial Center, U.S. Geological Survey, U.S. Forest Service, Bureau of Land Management, and National Oceanic and Atmospheric Administration reviewed the data for adherence to Hydrologic Unit standards.


    Data sources used in this process:
    • NRCS3

    (change 5 of 8)

    Metadata imported.


    Data sources used in this process:
    • C:\DOCUME~1\klegleit\LOCALS~1\Temp\xmlA3.tmp

    (change 6 of 8)

    Dataset moved.


    Data sources used in this process:
    • i:\illinois\watersheds\huc12\ilhuc12geo83

    (change 7 of 8)

    Dataset copied.


    (change 8 of 8)

    Metadata imported.


    Data sources used in this process:
    • D:\DOCUME~1\kbrown\LOCALS~1\Temp\xml8E.tmp

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How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?

    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.


  2. How accurate are the geographic locations?

    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.


  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    State-wide coverage is complete. Hydrologic unit boundaries between adjacent states may be adjusted as adjacent states complete their mapping.


  5. How consistent are the relationships among the observations, including topology?

    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.


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How can someone get a copy of the data set?
Are there legal restrictions on access or use of the data?

Access constraints: None
Use constraints:

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.


Distributor 1 of 1

  1. Who distributes the data set?

    N/A
    U.S. Department of Agriculture Natural Resources Conservation Service National Cartography and Geospatial Center

    P. O. Box 6567

    Ft. Worth, TX 76115
    USA

    (817) 334 5559 (voice)
    (817) 334 3486 (FAX)
    nrcs_data@ftw.nrcs.usda.gov

  2. What's the catalog number I need to order this data set?

    12-digit hydrologic units for Illinois

  3. What legal disclaimers am I supposed to read?

    Although these data have been processed successfully on a computer system at the U.S. Department of Agriculture, no warranty expressed or implied is made by the agency regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the U.S. Department of Agriculture, nor any of its agencies are liable for misuse of the data. Nor is it liable for damage, transmission of viruses, or computer contamination through the distribution of these data sets. The United States Department of Agriculture (USDA) prohibits discrimination in its programs on the basis of race, color, national origin, sex, religion, age, disability, political beliefs and marital or familial status. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audio tape, etc.) should contact the USDA Office of Communications at (202) 720-5881 (voice) or (202) 720-7808 (TDD).


  4. How can I download or order the data?

    • Availability in digital form:


      • Data format:

      		 in format ARCE Size: 4.875 MB

      Network links:

      		 ftp://ftp.ftw.nrcs.usda.gov/pub/hu/

    • Cost to order the data: Free by ftp or off the internet.


  5. Is there some other way to get the data?

  6. What hardware or software do I need in order to use the data set?

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Who wrote the metadata?
Dates:
Last modified: 20040203

Metadata author:
Kathleen J. Brown
Illinois State Water Survey
GIS Specialist

2204 Griffith Drive

Champaign, Illinois 61820
USA

217-333-6778 (voice)
217-333-6540 (FAX)
katbrown@uiuc.edu
Hours of Service: 8-5 Central

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:
  • http://www.esri.com/metadata/esriprof80.html

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