FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
VERSION 2003, RELEASED NOVEMBER, 2002.
TITLE: HYDROLOGIC CATALOGING UNITS OF FLORIDA
Geodataset Name: WATERSHED Geodataset Type: SHAPE Geodataset Feature: POLYGON
GENERAL DESCRIPTION:
This dataset contains Hydrologic Cataloging Units for the State of Florida. The Cataloging Unit currently represents the fourth level of hydrologic classification and the smallest element in the hierarchy of hydrologic units. Cataloging Units are sometimes called "watersheds". See "User Notes" for further description of the hydrological classification system.
DATA SOURCE(S): Florida Department of Environmental Protection SCALE OF ORIGINAL SOURCE MAPS: 1:24,000 DATE OF AUTOMATION OR SOURCE: N/A GEODATASET EXTENT: State of Florida
FEATURE ATTRIBUTE TABLES:
Datafile Name: HUCBAS.DBF ITEM NAME WIDTH TYPE PRECISION SHAPE 8 SHAPEPOLY 0 AREA 15 DECIMAL 3 PERIMETER 15 DECIMAL 3 NAME 30 CHARACTER - UFLAG 1 CHARACTER - SHADE 3 DECIMAL - HUC 19 DECIMAL 5 DESCRIPT 30 CHARACTER -
FEATURE ATTRIBUTE TABLES CODES AND VALUES:
ITEM ITEM DESCRIPTION
SHAPE Data attribute inherent to the ESRI shapefile format,
which defines the data as a point, polyline, or polygon.
AREA Area of cataloging unit (sq. meters)
PERIMETER Perimeter of cataloging unit (meters)
NAME HUC Basin Name
UFLAG Points to updates made by water
management districts. (this code is not as
inclusive as that found in the basins
coverage.)
UFLAG CODE:
A: attribute change only
M: modification to the shape only
N: new line work (for aat)
U: update to both the shape and attribute
SHADE 3 digit code that uses colornames.shd.
HUC USGS hydrologic unit code.
DESCRIPT FGDL added item based on item 'Name'
USER NOTES:
Hydrologic units are classified into four levels: regions, sub-regions, accounting units, and cataloging units. The hydrologic units are arranged within each other, from the smallest (cataloging units) to the largest (regions). Each hydrologic unit is identified by a unique hydrologic unit code (HUC). The data in this coverage are the smallest cataloging units. The first level of classification divides the Nation into 21 major geographic areas, or regions. These geographic areas contain either the drainage area of a major river, such as the Missouri region, or the combined drainage areas of a series of rivers, such as the Texas-Gulf region, which includes a number of rivers draining into the Gulf of Mexico. Eighteen of the regions occupy the land areaof the conterminous United States. Alaska is region 19, the Hawaii Islands constitute region 20, and Puerto Rico and other outlying Caribbean areas are region 21. The second level of classification divides the 21 regions into 222 subregions. A subregion includes the area drained by a river system, a reach of a river and its tributaries in that reach, a closed basin(s), or a group of streams forming a coastal drainage area. The third level of classification subdivides many of the subregions into accounting units. These 352 hydrologic accounting units nest within, or are equivalent to, the subregions. The fourth level of classification is the cataloging unit, the smallest element in the hierarchy of hydrologic units. [Efforts are underway to add further levels of subdivisions.] A cataloging unit is a geographic area representing part of all of a surface drainage basin, a combination of drainage basins, or a distinct hydrologic feature. These units subdivide the subregions and accounting units into smaller areas. There are 2150 Cataloging Units in the Nation. [Cataloging Units sometimes are called "watersheds." See, for example, the EPA Surf Your Watershed site.] The description of hydrologic units was taken from the USGS website, http://water.usgs.gov/GIS/huc.html Regional variations of basin borders and the number of basins may exist between updates. Please note, the Everglades portion of the SFWMD subset was changed from HUC 03090204 to HUC 03090202 by Bernadette Chasteen of Water Facilities (850/487-1784) in order to resolve a boundary dispute/question discovered by the EPA. Basin boundaries were used to create the new linework. 9/95 The dataset provides location and attribute information for use in national and regional cartographic and network analysis applications. A note concerning data scale: Scale is an important factor in data usage. Certain scale datasets are not suitable for some project, analysis, or modelling 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. 1:250000 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 analyses. 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 web pages at: http://www.geoplan.ufl.edu/education.html
FGDL QUALITY ASSURANCE STATUS:
-Clipped to the State of Florida -DESCRIPT item added based on NAME -Upcased all character records. -Dropped old internal coverage items: HUC_NO, HUC_ID
REFERENCES:
US Geological Survey. "What are Hydrologic Units" http://water.usgs.gov/GIS/huc.html
DATA LINEAGE SUMMARY:
In 2002, this data was downloaded in shapefile format by the GeoPlan Center from the Florida Department of Environmental Protection website: ftp.dep.state.fl.us. When received, the data was in Albers HPGN projection. The dataset's prior history (from FDEP) is as follows: NOTES ON DERIVATION: The cataloging unit boundaries were derived from the latest basin coverage (3/97) by dissolving on the item 'HUC' with the poly option, using A/I 7.0.4. In Spring '97, the data was converted from NAD27 to HPGN using the projection commmand within ARC/INFO version 7.0.4.
MAP PROJECTION PARAMETERS:
Projection ALBERS Units METERS Datum HPGN Spheroid GRS1980 1st standard parallel 24 0 0.000 2nd standard parallel 31 30 0.000 Central meridian -84 0 0.000 Latitude of projection's origin 24 0 0.000 False easting (meters) 400000.00000 False northing (meters) 0.00000
DATA SOURCES CONTACT(S):
Name: Florida Department of Environmental Protection
Abbr.name: FDEP
Ftp site: ftp.dep.state.fl.us
Contact Person: Eric W Brockwell
Phone: 850/488-0892
FGDL CONTACT:
Name: Florida Geographic Data Library
Abbr. Name: FGDL
Address: Florida Geographic Data Library
431 Architecture
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