FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION

TITLE: MAJOR LAND RESOURCE AREAS

Geodataset Name:      MLRA
Geodataset Type:      SHAPE
Geodataset Feature:   POLYGON

GENERAL DESCRIPTION:

This dataset contains Land Resource Regions (LRRs) and Major Land 
Resource Areas (MLRAs), originally established by the U.S. Department 
of Agriculture (USDA) Natural Resources Conservation Service (NRCS).
DATA SOURCE(S): United States Department of Agricultural
                Natural Resources Conservation Service                             
SCALE OF ORIGINAL SOURCE MAPS:    1:2,000,000
DATE OF AUTOMATION OR SOURCE:     2002
GEODATASET EXTENT:                State of Florida

FEATURE ATTRIBUTE TABLES:
Datafile Name: MLRA.DBF

ITEM NAME       WIDTH    TYPE      PRECISION
SHAPE              8     SHAPEPOLY      0                
AREA               9     DECIMAL        3                
PERIMETER          9     DECIMAL        3                
LRR_CODE           2     CHARACTER      0                
MLRA_CODE          5     CHARACTER      0                
LRR               55     CHARACTER      0                
MLRA              55     CHARACTER      0                
ACRES             16     DECIMAL        3                
DESCRIPT          55     CHARACTER      0

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 the polygon in square meters

PERIMETER                 Perimeter of polygon in coverage units 

LRR_CODE                  Land Resource Region Code, descriptive name stored in LRR item

MLRA_CODE                 Major Land Resource Area Code, desciptive name stored in MLRA item

LRR                       Name of Land Resource Region, from Agriculture Handbook 296 

MLRA                      Name of Major Land Resource Area, from Agriculture Handbook 296 

ACRES                     Acres of Polygon

DESCRIPT                  FGDL added item based on MLRA

USER NOTES:

This is a polygon shapefile of the Land Resource Regions and Major
Land Resource Areas of the conterminous United States. Land
resource regions are geographic areas that are characterized by a
particular pattern of soils, climate, water resources and land uses.
(USDA, Soil Conservation Service, 1981). Major land resource
areas are subregions of the land resource regions and comprise
smaller homogeneous areas. The scale of this shapefile is
1:2,000,000. The primary use of this shapefile is for regional and
national display rather than specific local data analysis due to the
small scale (1:2,000,000) of this shapefile.
MLRA boundaries were revised in the mid-1990s from earlier versions 
established in the 1970s and 1980s by the U.S. Department of Agriculture 
(USDA) Natural Resources Conservation Service (NRCS), formerly the Soil 
Conservation Service (SCS).  The revised MLRA boundary coverage was 
digitized at the Soil Survey Center in Lincoln, Nebraska, the most recent 
version of which was completed in January of 1997.  Buffer polygons were 
added to the U.S. national boundaries and shoreline by NRCS National 
Cartography and Geospatial Center in Fort Worth, Texas, for use with NRCS 
National Resources Inventory (NRI) digitizedsample sites.  These buffered 
boundaries were later removed by the NRCS National Headquarters office, 
Resource Assessment Division (RAD) in May 2000, and the national shoreline 
and outer boundaries were made to conform to standard boundaries established 
for State of the Land series maps (http://www.nhq.nrcs.usda.gov/land). Those 
standard U.S. national boundaries and shoreline are based on 1:2,000,000 scale 
8-digit hydrologic unit coverage obtained from the U.S. Geological Survey, circa 
1990, and were edited by the National Center for Resource Innovations (NCRI) in 
Washington, DC, and subsequently by NRCS/NHQ/RAD.
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:

-Projected data to FGDL Albers HPGN (See "Map Projection Parameters" below).
-Clipped to the State of Florida
-DESCRIPT item added based on MLRA
-Upcased all character records. 
-Dropped internal coverage items: Mlra_cov_, Mlra_cov_i
-Updated Area and Perimeter 

REFERENCES:

NRCS National Headquarters, Resource Assessment Division (RAD).  See USDA
Agriculture Handbook 296 "Land Resource Regions and Major Resource Areas of
the United States" for a look at an earlier version of the map and an
explanation of MLRA and LRR designations.

DATA LINEAGE SUMMARY:

GeoPlan downloaded this dataset in shapefile format from the USDA/NRCS ftp site. 
(ftp.nhq.nrcs.usda.gov/pub/outgoing/land/arc_export/us48mlra.e00.zip). When received, 
the data was in the following projection: Albers, Datum: NAD 27, Spheroid: Clarke 1866, 
Units: Meters. The shapefile was clipped to the State of Florida boundary and projected 
to FGDL Albers HPGN (See "Map Projection Parameters" below). The DESCRIPT item was added 
based on the MLRA item, all character items were upcased, internal coverage items were 
removed, and Area and Perimeter were updated.    

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 Department of Agricultural/
                  Natural Resources Conservation Service
Abbr.name:        USDA/NRCS
Address:          Natural Resources Conservation Service
                  Attn: Conservation Communications Staff
                  P.O. Box 2890
                  Washington, DC 20013		
Web site:         http://www.nrcs.usda.gov/		                 
Contact Person:   Dean Oman                 

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