FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
VERSION 2003, RELEASED NOVEMBER, 2002.

USGS 1:24,000 ROADS

Geodataset Name:      RDS24
Geodataset Type:      Shape
Geodataset Feature:   Line

GENERAL DESCRIPTION:

This coverage contains the digital line graphs (DLG) for the state of Florida as compiled by the Earth Science information center of the U.S. Geological Survey. The RDS24 coverage is a subset of all transportation data from the DLG data files derived from the 1:24,000-scale and other large-scale maps.

DATA SOURCE(S):                   UNITED STATES GEOLOGICAL SURVEY

SCALE OF ORIGINAL SOURCE MAPS:    1:24,000

DATE OF AUTOMATION OR SOURCE:     1990 to 1995

GEODATASET EXTENT:                State of Florida

FEATURE ATTRIBUTE TABLES
Datafile Name: RDS24.DBF

ITEM NAME   WIDTH         TYPE         PRECISION
DESCRIPT   100            Character    -

FEATURE ATTRIBUTE TABLES CODES AND VALUES

Item            Item description

Description of the FEATURE items

The RDS24 coverage is defined by use of major and minor pairs.

Major1 = DLG data delineations, ie. transportation, hydrology, boundaries, etc. Minor1 = defines the type of road, ie. bridge, two lane, class, etc.

Major2 = defines the type of road ie. state, us, county, interstate roads, etc. Minor2 = contains the state road #, ie. state Road #220, US 75, Cnty Rd 100 etc.

*Major and Minor pairs 3-10 are utilized in other DLG covers, however are not utilized as identifiers in RDS24!

USER NOTES:

This data layer was started in 1990 and is continually being updated.

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:

-Precision set to double.

-Descript item added based on FEATURE
   Descript item was calculated on Major1, Minor1 pairs, which
   describe the type of line (transportation) and type of road
   (ie.class 3 divided, footbridge, trail class 5, etc.)
   State Route names COULD be defined in a descript item by 
   reselecting major2 = 174  and using the minor2 code as the 
   descript item.   
   US Route names COULD also be defined in a descript item by 
   reselecting major2 = 173 and using the minor2 code as descript item.
   Interstate Route numbers COULD also be defined in a descript item by 
   reselecting the major2 = 172 and using the minor2 code to define the 
   item.
   Minor2 numbers could not be used as a rds24 descript item because of 
   conflicts between us, state, and interstate road names.

REFERENCES:

DATA LINEAGE SUMMARY:

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 SOURCE CONTACT(S):

Name:                   EARTH SCIENCE INFORMATION CENTER 
Abbr. Name:             N/A     
Address:                Earth Science Information Center
                        United States Geological Survey
                        507 National Center
                        Reston, VA  22092 
Phone:                  (703) 860-6045
Fax:                    (703) 860-4165
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 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