FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
TITLE: MAJOR LAND RESOURCE AREAS
Geodataset Name: MLRA Geodataset Type: SHAPE Geodataset Feature: POLYGON
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
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
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
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
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