FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION TITLE: HYDROLOGIC UNIT BOUNDARIES IN FLORIDA - 12-DIGIT - SEPTEMBER 2015 Geodataset Name: NHDWBD_HUC12_SEP15 Geodataset Type: SHAPEFILE Geodataset Feature: Polygon Feature Count: 1853 |
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GENERAL DESCRIPTION:
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DATA SOURCE(S): U.S. Geological Survey, U.S. Environmental Protection Agency, USDA Forest Service, Florida Department of Environmental Protection SCALE OF ORIGINAL SOURCE MAPS: 24000 GEODATASET EXTENT: State of Florida |
FEATURE ATTRIBUTE TABLES:
Datafile Name: NHDWBD_HUC12_SEP15.DBF
ITEM NAME | WIDTH | TYPE |
OBJECTID
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4 | OID |
SHAPE
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4 | Geometry |
TNMID
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40 | String |
METASOURCE
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40 | String |
SOURCEDATA
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100 | String |
SOURCEORIG
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130 | String |
SOURCEFEAT
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40 | String |
LOADDATE
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36 | Date |
GNIS_ID
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8 | Double |
AREAACRES
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8 | Double |
AREASQKM
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8 | Double |
STATES
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50 | String |
HUC12
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12 | String |
NAME
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120 | String |
HUTYPE
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254 | String |
HUMOD
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30 | String |
TOHUC
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16 | String |
NONCON_AC
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8 | Double |
NONCON_KM
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8 | Double |
HUTYPE_DSC
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20 | String |
DESCRIPT
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120 | String |
FGDLAQDATE
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36 | Date |
AUTOID
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4 | Integer |
SHAPE.AREA
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0 | Double |
SHAPE.LEN
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0 | Double |
FEATURE ATTRIBUTE TABLES CODES AND VALUES:
Item | Item Description | |
OBJECTID |
Internal feature number. |
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SHAPE |
Feature geometry. |
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TNMID |
(short for The National Map Identification) is a unique 40-character field that identifies each element in the database exclusively. TNMID is an automatically assigned code that stays with each element. When an element is updated or changed, TNMID links the element to the metadata record and documents the change. TNMID is also used to maintain relationship classes in the normalized data model. When an element is deleted or split, TNMID stays with the original element and is not used again. When an element is split, new permanent identifiers are assigned to the resultant parts. |
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METASOURCE |
Unique identifier that links the element to the metadata tables. This ID is generated and assigned automatically by the database and remains with the object permanently. |
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SOURCEDATA |
A space provided for a brief description of the type of base data used to update or change the current WBD. The WBD In-State Steward completes this field as part of the metadata form |
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SOURCEORIG |
The description of the agency that created the base data used to improve the WBD. The WBD In-State Steward completes this field as part of the metadata form. |
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SOURCEFEAT |
Like TNMID, SourceFeatureID is a long, unique code. This code identifies the parent of the feature if the feature is the result of a split or merge, and it is automatically generated and assigned |
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LOADDATE |
Represents the date when the data were loaded into the official USGS WBD ArcSDE database. The field is the effective date for all feature edits, and it is automatically generated. |
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GNIS_ID |
Preassigned numeric field that uses a unique number to relate the name of the hydrologic unit to the GNIS names database. This field is automatically generated in the database. |
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AREAACRES |
Common to all polygon feature classes and is calculated at the 12-digit hydrologic unit from the intrinsic area value maintained by the GIS software; therefore, acreage values may vary from user calculations, depending on the projection of the data. North American Albers Equal Area Conic, North American Datum 1983 is the required projection to use for calculation. If the units of the area field are stored in square meters, then use the conversion factor 0.0002471. For example, 40,469,446 square meters multiplied by 0.0002471 = 10,000 acres. |
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AREASQKM |
Calculated at the 12-digit hydrologic unit from the intrinsic area value maintained by the GIS software; therefore, the square kilometer values may vary from user calculations, depending on the projection of the data. North American Albers Equal Area Conic, North American Datum 1983 is the default projection. |
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STATES |
The States or outlying area attribute identifies the State(s) or outlying areas that the hydrologic unit falls within or touches. The U.S. Census Bureau 1:100,000-scale State layer will be used to establish State boundaries in the derivation process. The two-letter U.S. Postal Service State abbreviation is assigned. If a hydrologic unit crosses into Canada, the two- letter Canada Post abbreviation for the Province is used. If a unit crosses into Mexico, the MX designation is used. If more than one abbreviation is used, they are separated by commas, without spaces, and are sorted in alphabetical order. This field is populated by the In-State Steward at the 12-digit hydrologic unit |
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HUC12 |
The HUC12 field is a unique 12-digit hydrologic unit code. |
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NAME |
The 16-digit hydrologic unit name refers to the GNIS name for the geographic area in which the hydrologic unit is located |
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HUTYPE |
The 10-digit hydrologic unit type attribute is the single- letter abbreviation for Watershed type from the list of official names provided below. Use the single type that most closely describes the 10-digit hydrologic unit (see coastal examples in fig. 10).
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HUMOD |
The 10-digit hydrologic unit modification attribute is a two-character, uppercase abbreviation(s) for either (1) the type of modification to natural overland flow that alters the natural delineation of a 10-digit hydrologic unit or (2) the special conditions GF-groundwater flow, GL-glacier, IF-ice field, KA- karst, and NC-noncontributing area. The value of the HUMod field helps to indicate where the modification to the 10-digit hydrologic unit is located. If more than one abbreviation is used, then separate them by commas without spaces and list them from most to least predominant. There are future plans to derive this field at the 10-digit unit from the information on the HUMod from the lines and the HUMod at the 12-digit unit upon check in. Once that process is in place the content will be overwritten. Previous versions of this guideline did not provide the same number of modification choices check metadata or contact the principal WBD In-State Steward for more information.
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TOHUC |
The 12-digit hydrologic unit ToHUC code attribute is the code for the 12-digit hydrologic unit that is downstream from and naturally receives the majority of the flow from another 12-digit hydrologic unit. For special cases when a downstream code cannot be assigned, identify which of these exceptions applies: If a hydrologic unit flows into an ocean or the Gulf of Mexico, then populate this field with the value OCEAN. If a hydrologic unit drains into either Canada or Mexico, then use the appropriate value CANADA or MEXICO. If a hydrologic unit is a closed basin, then populate this field with the value CLOSED BASIN. |
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NONCON_AC |
The noncontributing area attribute represents the area, in acres, of hydrologic units that do not contribute to downstream accumulation of streamflow under normal flow conditions (section 3.5.3). If a noncontributing area is on the boundary between two or more hydrologic units, then determine the low point along the noncontributing area boundary, and associate the noncontributing area with the hydrologic unit adjacent to the low point on the boundary. The value is the total acreage of the noncontributing areas within a hydrologic unit. North American Albers Equal Area Conic, North American Datum 1983 is the required projection to use for calculation. If the units of the area field are stored in square meters, then use the conversion factor 0.0002471. |
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NONCON_KM |
The noncontributing area attribute represents the area, in square kilometers, of hydrologic units that do not contribute to downstream accumulation of streamflow under normal flow conditions (section 3.5.3). If a noncontributing area is on the boundary between two or more hydrologic units, then determine the low point along the noncontributing area boundary, and associate the noncontributing area with the hydrologic unit adjacent to the low point on the boundary. The value is the total square kilometers of the noncontributing areas within a hydrologic unit. North American Albers Equal Area Conic, North American Datum 1983 is the required projection to use for calculation. If the units of the area field are stored in square meters, then use the conversion factor 0.0002471 |
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HUTYPE_DSC |
Description based on HUTYPE field. See HUTYPE for more information. |
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DESCRIPT |
GeoPlan added field based on NAME |
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FGDLAQDATE |
Date GeoPlan acquired from source. |
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AUTOID |
Unique ID added by GeoPlan |
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SHAPE.AREA |
Area in meters |
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SHAPE.LEN |
Perimeter in meters |
This data is provided 'as is'. GeoPlan relied on the integrity of the original data layer's topology |
This data is provided 'as is' by GeoPlan and is complete to our knowledge. |
GeoPlan relied on the integrity of the attribute information within the original data. |
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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 40,000 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. |
This data is provided 'as is' and its horizontal positional accuracy has not been verified by GeoPlan |
This data is provided 'as is' and its vertical positional accuracy has not been verified by GeoPlan |
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 7. 5 should be acknowledged as the data source in products derived from these data. The 7 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. |
The Florida Geographic Data Library is a collection of Geospatial Data compiled by the University of Florida GeoPlan Center with support from the Florida Department of Transportation. GIS data available in FGDL is collected from various state, federal, and other agencies (data sources) who are data stewards, producers, or publishers. The data available in FGDL may not be the most current version of the data offered by the data source. University of Florida GeoPlan Center makes no guarantees about the currentness of the data and suggests that data users check with the data source to see if more recent versions of the data exist. Furthermore, the GIS data available in the FGDL are provided 'as is'. The University of Florida GeoPlan Center makes no warranties, guaranties or representations as to the truth, accuracy or completeness of the data provided by the data sources. The University of Florida GeoPlan Center makes no representations or warranties about the quality or suitability of the materials, either expressly or implied, including but not limited to any implied warranties of merchantability, fitness for a particular purpose, or non-infringement. The University of Florida GeoPlan Center shall not be liable for any damages suffered as a result of using, modifying, contributing or distributing the materials. A note about data scale: Scale is an important factor in data usage. Certain scale datasets are not suitable for some project, analysis, or modeling purposes. Please be sure you are using the best available data. 1:24000 scale datasets are recommended for projects that are at the county level. 1:24000 data should NOT be used for high accuracy base mapping such as property parcel boundaries. 1:100000 scale datasets are recommended for projects that are at the multi-county or regional level. 1:125000 scale datasets are recommended for projects that are at the regional or state level or larger. Vector datasets with no defined scale or accuracy should be considered suspect. Make sure you are familiar with your data before using it for projects or analysis. Every effort has been made to supply the user with data documentation. For additional information, see the References section and the Data Source Contact section of this documentation. For more information regarding scale and accuracy, see our webpage at: http://geoplan.ufl.edu/education.html |
https://pubs.usgs.gov/tm/11/a3/pdf/tm11-a3.pdf |
GeoPlan Center downloaded the NHD GeoDatabase from the Florida Department of Environmental Protection in May 2016. The data was exported to shapefile and defined with the FGDL Albers projection file. This data was originally produced by U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency, USDA Forest Service, and other Federal, State and local partners. The Florida Data Stewards (FDEP) then update the data. After exporting GDB feature classes to shapefile using ArcGIS 10.3.1, the NONCONTRIBUTINACRES renamed to NONCON_AC NONCONTRIBUTINGSQKM renamed to NONCON_KM HYTYPE_DSC added based on HUTYPE domain text values Upcased all fields DESCRIPT field added based on NAME field FGDLAQDATE added based on date downloaded from source Renamed GDB feature class from WBDHU12 to nhdwbd_huc12_sep15.shp based on most recent date in field LOADDATE Metadata was derived using instructions from here: http://nhd.usgs.gov/wbd_metadata.html Attribute definitions were taken from here: https://pubs.usgs.gov/tm/11/a3/pdf/tm11-a3.pdf Process Date: 20160630 |
Projection ALBERS Datum HPGN Units METERS Spheroid GRS1980 1st Standard Parallel 24 0 0.000 2nd Standard Parallel 31 30 0.000 Central Meridian -84 00 0.000 Latitude of Projection's Origin 24 0 0.000 False Easting (meters) 400000.00000 False Northing (meters) 0.00000
DATA SOURCE CONTACT (S):
Name: Abbr. Name: Address: Phone: Web site: E-mail: Contact Person: Phone: E-mail: |
Florida Department of Environmental Protection (FDEP) OTIS/GIS Section FDEP 2600 Blair Stone Rd, MS 6520 Tallahassee, FL 32399-2400 |
Name: FLORIDA GEOGRAPHIC DATA LIBRARY Abbr. Name: FGDL Address: Florida Geographic Data Library 431 Architecture Building PO Box 115706 Gainesville, FL 32611-5706 Web site: http://www.fgdl.org Contact FGDL: Technical Support: http://www.fgdl.org/fgdlfeed.html FGDL Frequently Asked Questions: http://www.fgdl.org/fgdlfaq.html FGDL Mailing Lists: http://www.fgdl.org/fgdl-l.html For FGDL Software: http://www.fgdl.org/software.html