FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
VERSION 2006
TITLE: USGS 1:24,000 HYDROGRAPHY - LINES
Geodataset Name: HY24L Geodataset Type: SHAPE Geodataset Feature: LINE
GENERAL DESCRIPTION:
This dataset contains Hydrological Line Features from the USGS 1:24000 scale DLG's. The dataset has been updated from the previous version on FGDL 3.0.
DATA SOURCE(S): United States Geological Survey SCALE OF ORIGINAL SOURCE MAPS: 1:24,000 DATE OF AUTOMATION OR SOURCE: Ongoing GEODATASET EXTENT: State of Florida 
FEATURE ATTRIBUTE TABLES:
Datafile Name: HY24L.DBF ITEM NAME WIDTH TYPE PRECISION SHAPE 9 Line 0 DESC1 50 CHARACTER - DESCRIPT 50 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 DESC1 Description based on Major1/Minor1 DESCRIPT FGDL added item, based on the major/minor pair that is most descriptive 
USER NOTES:
This data set comes from the USGS revised DLG ftp site. There are two hydrography datasets: HY24P and HY24L. Hy24P has polygon features and HY24L has line features.
The DLG's were converted to coverage format, processed, then converted to shapefile. The following items were removed from the attribute table: Major1, Minor1, Major2, Minor2, Major3, Minor3, Major4, Minor4, Major5, Minor5, Phot_rev, Surf_ft, Surf_m, Below_m, Angle, Riv_mile, Position, Coinc_ft, Desc2, Desc3, Desc4, Desc5. These items were removed for ease of querying the database since most records contained no values for these items. The items Desc1, Desc2, Desc3, Desc4, and Desc5 are verbal descriptions which correspond to the Major/Minor code pairs. GeoPlan added the 'DESCRIPT' item based on DESC1-DESC5 to represent the value that was most descriptive.
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
This dataset has been updated from the previous version on FGDL 3.0.
FGDL QUALITY ASSURANCE STATUS:
-Converted from dlg to coverage -Separated utm zone 16 from utm zone 17 -Mapjoined 16's and 17's with net option -Used aml to joinitem pcode values to .pat and acode to .aat -Added major and minor codes up to five in order to ensure proper mapjoin -Build with poly option -Set tolerances with settol then increased fuzzy to 2 -Dropfeatures line for coverage -Dissolve to get rid of extraneous boundary lines -Alter fields to make sure that they are not over 10 characters -Set Tolerances to FGDL Standards -Set Precision to Double -Upcased Fields that had lower case characters -Added DESCRIPT item based on the major/minor pair that is most descriptive -Removed all items except Desc1 and Descript -Converted to Shapefile
REFERENCES:
UNITED STATES GEOLOGICAL SURVEY (USGS)
DATA LINEAGE SUMMARY:
The data was downloaded by the GeoPlan Center from the USGS DLG ftp site. The files were orginally in DLG format. The source projection was UTM (zone 16 and 17) units - meters datum - Nad27 and spheroid - Clarke 1866.
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: UNITED STATES GEOLOGICAL SURVEY Abbr. name: USGS Address: USGS Mapping Applications Center National Cartographic Info Center 507 National Center Reston VA 22092 Phone: (703) 8606045 Fax: (703) 6484165 Web site: http://www.usgs.gov Email: MACWEBMASTER@USGS.GOV Contact Person: They will route your message to the person best qualified to respond.
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/fgdl/fgdlfeed.html FGDL Frequently Asked Questions: http://www.fgdl.org/fgdl/fgdlfaq.html FGDL Mailing Lists: http://www.fgdl.org/fgdl/fgdl-l.html For FGDL Software: http://www.fgdl.org/fgdl/software.html