Metadata
fox-bnd-huc12
Shapefile
| Description | Spatial | Attributes |
Keywords
Theme:
Hydrologic units, Watershed Boundaries, Subwatershed Boundaries
Place:
Illinois, Fox Watershed
Description
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.
Purpose
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.
Links to graphics describing the data
- N/A (N/A): N/A
_________________
Status of the data
Complete
Data update frequency: As needed
Data update frequency: As needed
Time period for which the data is relevant
Date and time:
2002
Description:
publication date
Publication Information
Who created the data: U. S. Department of Agriculture,
Natural Resources Conservation Service
Date and time:
2002
Publisher and place:
U. S. Department of Agriculture,
Natural Resources Conservation Service, Fort Worth, Texas
_________________
Data storage and access information
File name: fox-bnd-huc12
Type of data: vector digital data
http://www.ftw.nrcs.usda.gov/HUC/huc_download.html
Data processing environment: Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 8.3.0.800
Type of data: vector digital data
Location of the data:
Accessing the data
Data format: ARCE
Size of the data: 0.181 MB
Data transfer size: 4.875 MB MB
ftp://ftp.ftw.nrcs.usda.gov/pub/hu/
Size of the data: 0.181 MB
Data transfer size: 4.875 MB MB
Network location:
Constraints on accessing and using 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.
Details about this document
Contents last updated: 20040203
at time 08552600
Who completed this document
Kathleen J. Brown
Illinois State Water Survey
mailing and physical address:
217-333-6778 (voice)
217-333-6540 (fax)
katbrown@uiuc.edu
Illinois State Water Survey
mailing and physical address:
2204 Griffith Drive
Champaign, Illinois 61820
USA
217-333-6778 (voice)
217-333-6540 (fax)
katbrown@uiuc.edu
Hours of service:
8-5 Central
Standards used to create this document
Standard name: FGDC Content Standards for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention used in this document: local time
Metadata profiles defining additonal information
ESRI Metadata Profile: http://www.esri.com/metadata/esriprof80.html
Standard version: FGDC-STD-001-1998
Time convention used in this document: local time
Metadata profiles defining additonal information
Horizontal coordinate system
Projected coordinate system name: Clarke_1866_Lambert_Conformal_Conic
Geographic coordinate system name: GCS_Clarke_1866
Details
Map Projection Name: Lambert Conformal Conic
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
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 Coordinate Information
Planar Distance Units: survey feet
Coordinate Encoding Method: coordinate pair
Coordinate Representation
Abscissa Resolution: 0.001024
Ordinate Resolution: 0.001024
Geodetic Model
Horizontal Datum Name: D_Clarke_1866
Ellipsoid Name: Clarke 1866
Semi-major Axis: 6378206.400000
Denominator of Flattening Ratio: 294.978698
_________________
Bounding coordinates
Horizontal
In decimal degrees
West:
-89.092786
East:
-88.034141
North:
42.503011
South:
41.336246
In projected or local coordinates
Left: 3111291.116065
Right: 3393881.274152
Top: 3446575.212129
Bottom: 3026063.931609
_________________
Spatial data quality
Horizontal positional accuracy
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.
Estimated accuracy: 10
How this value was determined:
Hydrologic unit boundaries generally were digitized within 0.01 inches of their locations on the digitizing source. The digital map elements are edge matched against the data for the adjacent quadrangle. Edge match locations generally do not deviate from centerline to centerline by more than 0.01 inches.
_________________
Spatial data description
Vector data information
ESRI description
fox-bnd-huc12
ESRI feature type: Simple
Geometry type: Polygon
Topology: FALSE
Feature count: 1
Spatial Index: TRUE
Linear referencing: FALSE
Geometry type: Polygon
Topology: FALSE
Feature count: 1
Spatial Index: TRUE
Linear referencing: FALSE
SDTS description
fox-bnd-huc12:
G-polygon, 1
Feature class:
Label point, 1884
Feature class:
GT-polygon composed of chains, 1966
Feature class:
Point, 4
Feature class: SDTS feature type, feature count
Details for fox-bnd-huc12
Type of object: Feature Class
Number of records: 1
Description
Attributed arcs of hydrologic unit polygons
Source: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
Source: U.S. Department of Agriculture. 2001. Federal Standards for Delineation of Hydrologic Unit Boundaries.
Attributes
FID
Alias: FID
Data type: OID
Width: 4
Precision: 0
Scale: 0
Definition:
Data type: OID
Width: 4
Precision: 0
Scale: 0
Definition:
Internal feature number.Definition Source:
ESRI
Shape
Alias: Shape
Data type: Geometry
Width: 0
Precision: 0
Scale: 0
Definition:
Data type: Geometry
Width: 0
Precision: 0
Scale: 0
Definition:
Feature geometry.Definition Source:
ESRI
HU_10_TYPE
Alias: HU_10_TYPE
Data type: String
Width: 254
Definition:
Data type: String
Width: 254
Definition:
Internal node number for the beginning of an arc (from-node).Definition Source:
ESRI
Cnt_HU_10_
Alias: Cnt_HU_10_
Data type: Number
Width: 9
Definition:
Data type: Number
Width: 9
Definition:
Internal node number for the end of an arc (to-node).Definition Source:
ESRI
Sum_ACRES
Alias: Sum_ACRES
Data type: Number
Width: 19
Number of decimals: 4
Definition:
Data type: Number
Width: 19
Number of decimals: 4
Definition:
Internal node number for the left polygon.Definition Source:
ESRI
RPOLY#
Definition:
Internal node number for the right polygon.Definition Source:
ESRI
LENGTH
Definition:
Length of feature in internal units.Definition Source:
ESRI
IL_HU12_GEO83#
Definition:
Internal feature number.Definition Source:
ESRI
IL_HU12_GEO83-ID
Definition:
User-defined feature number.Definition Source:
ESRI
HU_LEVEL
Definition:
The highest hydrologic unit level (smallest number) for the line (arc) represented by the recordDefinition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
LINESOURCE
Definition:
The base map source(s) used to delineate at 1:24,000 scaleDefinition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
META_ID
Definition:
Metadata ID is a code that identifies which metadata file applies to the arcDefinition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_10_DS
HU_10_NAME
HU_10_MOD
HU_10_TYPE
HU_12_DS
HU_12_NAME
HU_12_MOD
HU_12_TYPE
_________________
Details for il_hu12_geo83.pat
Description
polygons identify watershed boundaries
Source: U.S. Department of Agriculture. 2001. Federal Standards for
Source: U.S. Department of Agriculture. 2001. Federal Standards for
Attributes
FID
Definition:
Internal feature number.Definition Source:
ESRI
Shape
Definition:
Feature geometry.Definition Source:
ESRI
AREA
Definition:
Area of feature in internal units squared.Definition Source:
ESRI
PERIMETER
Definition:
Perimeter of feature in internal units.Definition Source:
ESRI
IL_HU12_GEO83#
Number of decimals: 4
Definition:
Definition:
Internal feature number.Definition Source:
ESRI
IL_HU12_GEO83-ID
Definition:
User-defined feature number.Definition Source:
ESRI
HUC_8
Definition:
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.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HUC_10
Definition:
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.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HUC_12
Definition:
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.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
ACRES
Definition:
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).Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
STATES
Definition:
The "States" field needs to include the names of all state(s) that the subwatershed falls within.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
NCONTRB_A
Definition:
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 fieldDefinition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_10_DS
Definition:
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.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_10_NAME
Definition:
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 toDefinition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_10_MOD
Definition:
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.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_10_TYPE
Definition:
This field identifies the type of watershed.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_12_DS
Definition:
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.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_12_NAME
Definition:
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 toDefinition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_12_MOD
Definition:
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.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_12_TYPE
Definition:
This field identifies the type of watershed.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_12_NAME
Definition:
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 toDefinition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_12_MOD
Definition:
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.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_12_TYPE
Definition:
This field identifies the type of watershed.Definition Source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
_________________
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.
Overview citation
Federal Standard for Delineation of Hydrologic Unit Boundaries.
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