Battaglin, W.A., and Goolsby, D.A. 1994 1.0 Digital Data Reston, Virginia U.S. Gelogical Survey http://water.usgs.gov/lookup/getspatial?ag_land Battaglin, W. A.; Goolsby, D. A. 1995 report U.S. Geological Survey Water Resources Investigative Report WRIR 944176 Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/publication/wri944176 This coverage contains estimates of land in agricultural production in counties in the conterminous United States as reported in the 1987 Census of Agriculture (U.S. Department of Commerce, 1989a). Land in agriculture data are reported as either a number (for example, number of Farms), acres, or as a percentage of county area. Land in agriculture estimates were generated from surveys of all farms where $1,000 or more of agricultural products were sold, or normally would have been sold, during the census year. Most of the attributes summarized represent 1987 data, but some information for the 1982 Census of Agriculture also was included. The polygons representing county boundaries in the conterminous United States, as well as lakes, estuaries, and other nonland-area features were derived from the Digital Line Graph (DLG) files representing the 1:2,000,000-scale map in the National Atlas of the United States (1970). Agricultural land Census of Agriculture Counties United States The land in agriculture production estimates in this coverage are intend for use in estimating regional land in agricultural production, and in producing visual displays and mapping relative amounts of agricultural land use across broad regions of the United States. Procedures_Used: CENSUS DATA An automated procedure was developed for processing the raw census data into ARC/INFO coverage attributes. The procedure is summarized below: 1) copy county2m coverage to coverage representing type of census data (i.e. ag_expn or ag_land), 2) run agadd.aml for each item added to the coverage, giving coverage name and attribute field number as arguments. The agadd.aml program runs a fortran program to extract field data from the raw census data files, and then processes that raw data finally adding it as a column of attribute data to the county coverage. Other programs were developed to calculate summary statistics of the census attribute data, and to make graphics representing attribute values across the United States. COUNTY BOUNDARIES This series of maps was published as part of the National Atlas of the United States (U.S.Geological Survey, 1970). The maps for the conterminou United States were digitized in 15 sheets and published in the Digital Lin Graph (DLG) format as described by Domeratz and others (1983). Each sheet was prepared by reading the DLG files of the political and water bodies layers, converting them to ARC/INFO, extracting the county boundaries and the coastline, respectively, and joining the two layers. FIPS codes were assigned to all polygons by using available sources and were checked manually. Boundaries with adjacent sheets of the 15-sheet set were edgematched manually, arbitrarily choosing one of the sheets as the "correct" border. Edgematching operations adjusted the linework as far as was necessary so that the coverages would fit to a tolerance of 100 meters. The coverage (referred to herein as Version 1.0) was stored as 49 separate coverages (48 States and the District of Columbia) because the ARC/INFO software in use at the time could not process the entire coverage. Individual States could be joined by specifying a tolerance of 100 meters. From time to time, adjustments were made to the State coverages to reflect changes in U.S. counties. It is believed the accuracy of these adjustments is comparable to the original linework. For Version 2.0, all State coverages were rejoined and manually edited to produce a perfect edgematch between all States. For States on the original map sheet boundaries, this adjustment averaged less than 20 meters and in no case was more than 100 meters. The whole coverage was CLEANed to a tolerance of 20 meters, which resulted in few, if any, effect on small offshore islands. The coverage also was checked to ensure that it represented current U.S. counties or county equivalents. The coverage in Version 1.0 stopped at the coastline. There was no attempt to depict offshore areas. This created some problems when the coverage was used to assign county codes to sampling stations located near the coast. To help in this matter, Version 2.0 includes offshore extensions of the county polygons. The (water) boundaries of many of these polygons are arbitrary. The Canadian Great Lakes features are another new addition to Version 2. They were added to improve the utility of the coverage for visual displays Although the Canadian Great Lakes are logically represented by a single polygon, practical considerations -- the inability of some software to plo polygons with a large number of vertices -- made it necessary to separate them into four polygons. The dividing lines are located in narrow channel to minimize interference with plotting patterns. Canadian islands within the Great Lakes also were included. All ticks were relocated to places that are easily visible on maps of the United States, to help in registering maps that may not otherwise have adequate registration information. To expedite accessing parts of the coverage, certain items have been indexed with the procedure, INDEX_COUNTY.AML. See Section 3 above. A spatial index also was created. When using this coverage to clip or intersect other coverages, a tolerance as low as 2 meters can be used. The processing used to derive this coverage moved boundaries from their positions on the original maps. In cases of conflicting lines, preference was given to forming the correct topology. Strictly speaking, this coverag is not identical to the source materials. These changes were unavoidable in producing a continuous coverage of the conterminous United States. Revisions: COUNTY POLYGON DATA Revision 1.0, 12/17/90. This revision represents numerous corrections and minor modifications made to this set of coverages from its construction in 1985 through the revision date. Revision 2.0, 3/18/91. Major reworking of the coverage, combining all State coverages. Reviews_Applied_to_Data: The Census of Agriculture data processing procedure and attribute data have been peer reviewed in 1993 by Leonard Orzol and Barbara Ruddy, both hydrologist with the USGS. The county boundaries in this coverage have received no formal review. They have, however, been used in numerous applications where serious error would have been obvious. Some State coverages were corrected following such use. The offshore polygon extensions and the Canadian Great Lakes polygons have had no review. Related_Spatial_and_Tabular_Data_Sets: This coverage is part of series of 1:2,000,000-scale base maps covering the United States. Layers in this set include: COUNTY -- County boundaries. STATE -- State boundaries (formed from COUNTY). WATERBOD -- Water Bodies. STREAM -- Streams. HUC -- Hydrologic cataloging units (basins). Other_References_Cited: Domeratz, M. A., Hallam, C. A., Schmidt, W. E., and Calkins, H. W., 1983, USGS Digital Cartographic Data Standards: Digital Line Graphs from 1:2,000,000-scale Maps. U.S. Geological Survey Circular 895-D, 38p. Nebert, Douglas D., 1994, Design of the distributed spatial data library for the Water Resources Division, U. S. Geological Survey: U. S. Geological Survey Open-File Report, 94-327, 30 p. U.S. Department of Commerce, 1989a, Census of agriculture, 1987 -- Final county file: U.S. Department of Commerce, Bureau of the Census, [machine-readable data file] U.S. Department of Commerce, 1989b, Census of agriculture, 1987 -- Final county file technical documentation: U.S. Department of Commerce, Bureau of the Census, Data User Services Division. U.S. Department of Commerce, 1990, Census of agriculture, 1987 -- Agricultural atlas of the United States, volume 2: U.S. Department of Commerce, Bureau of the Census, Agriculture Division, AC87-S-1, 210 p. U.S. Geological Survey, 1970, National atlas of the United States of America: Washington D.C., U. S. Geological Survey, 417 p. Notes: DOCUMENTATION The documentation for this coverage was generated by using the ARC macro language (AML) program document.aml available from the U.S. Geological Survey (Nebert, 1994). 0000 (Here you put information defining how the time period of content information, on the DOC file, was determined) Complete (Here you pick one of the following entries that describes how often changes or additions are made to the data set. Pick one, and delete the rest) Continually Daily Weekly Monthly Annually Unknown As Needed Irregular None planned -128.07002717 -65.25698378 48.26194027 22.67774911 None Land in Agriculture in counties from the 1987 Census of Agriculture inlandWaters None Conterminous United States None None None None (describe any restrictions or legal prerequisites for accessing the data set. Put "None" if there are no restrictions) CENSUS DATA Estimates of land in agriculture by county were reported by the U.S. Department of Commerce (1989a, 1898b) in the 1987 Census of Agriculture. The estimates were constructed from surveys of all farms where $1,000 or more of agricultural products were sold, or normally would have been sold, during the census year. Sampling and statistics were used to account for nonresponding farm operations. Thus, the information in the Census of Agriculture is subject to sampling variability as well as reporting and coverage errors. Census disclosure rules prevent publication of information that would disclose the operation of individual farms. Thus, for example, one or two sod farms may be reported in a county, but no acreage of sod harvested is reported, because release of that information might disclose information about a particular farmer's operation. COUNTY BOUNDARIES The original files for this map were provided in 15 sections. Boundaries near the edges of sections have been adjusted in edgematching. Polygons that extend into the water (an ocean or the Great Lakes) should be considered arbitrary. William A. Battaglin U.S. Geological Survey, Water Resources Div. (WRD) Hydrologist, Office of the Regional Hydrologist mailing address

P.O. Box 25046, Denver Federal Center, Bldg. 25

Lakewood CO 80225 USA 1-888-275-8747 303-236-5959 wbattagl@usgs.gov 8:00am-4:30pm MST Please contact thru email http://water.usgs.gov/GIS/browse/ag_land.gif Illlustration of data set GIF (Here you acknowledge the agencies and organizations that gave you money, resources, and encouragement to digitize the data and to enter all this wonderful metadata.) None Unclassified None dgux, 5.4R3.10, AViiON UNIX, ARC/INFO version 7.0.4 See Entity_Attribute_Information See Explanation Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section. Polygon and chain-node topology present. (Information in wordy narrative form describing omissions, selection criteria, generalization, definitions used, and other rules applied to derive the data set) (An explanation of the accuracy of the horizontal coordinate measurements and a description of tests used, if any, to determine horizontal positional accuracy. This is different from horizontal resolution as reported in the DOC file. Positional accuracy defines how correctly the digital features match real-world features and woiuld be related to the concept of the National Map Accuracy Standard -- xx% of well-defined point features fall within xx units of their true position. The resolution is the smallest unit of measure the GIS can reliably manage without truncation or rounding.) approx. 1 km Resolution as reported (The same as above, but for vertical information that may be encoded with the 2-D features such as cell or contour estimates of a vertical dimension. A description of the contour interval of input data and its basis could be described here.) Unspecified 0000 2,000,000 Unspecified 0000 Unspecified Unspecified Unspecified RESELECT COUNTY2M COUNTY.NEW POLY None 19911112 1528 None LABELERRORS COUNTY.NEW None 19911112 1529 None LABELERRORS COUNTY.NEW None 19911112 1556 None EXTERNALALL None 19911112 1721 None RENAME COUNTY.NEW COUNTY2M None 19911113 1249 None CREATELABELS COUNTY2M 5000 None 19911115 1656 None EXTERNALALL None 19911204 1410 None COPY COUNTY2M /ARC3/WORK/LIB/COUNTY2M None 19920102 0833 None COPY /ARC3/WORK/LIB/COUNTY2M COUNTY.AG None 19920102 1527 None RENAME COUNTY.AG CNTY.AG None 19920102 1527 None COPY /ARC3/WORK/CNTY.AG COUNTY2M None 19920107 1423 None EXPORT COVER COUNTY2M COUNTY2M None 19920117 1350 None COPY /ARC3/WORK/LIB/COUNTY2M COUNTY2M None 19920121 1549 None BUILD COUNTY2M POLY None 19920121 1615 None ARCEDIT /ARC3/WORK/COUNTY2M None 19920122 0948 None BUILD COUNTY2M POLY None 19920122 0956 None IDEDIT COUNTY2M POLY None 19920122 1101 None COPY COUNTY2M /ARC3/WORK/LIB/COUNTY2M None 19920122 1102 None IDEDIT COUNTY2M POLY None 19920330 1537 None EXPORT COVER COUNTY2M COUNTY2M None 19920608 1103 None ARCEDIT /ARC3/WORK/LIB/COUNTY2M None 19920803 1748 None BUILD COUNTY2M POLY None 19920803 1758 None CLEAN COUNTY2M # 2 2 POLY None 19920803 1846 None COPY COUNTY2M /WB2/DB/USA/COUNTY2M None 19920804 0919 None COPY /WB2/DB/USA/COUNTY2M AG_LAND None 19930111 1050 None DOCUMENT AG_LAND DELETE WBATTAGL None 19930325 1455 None DOCUMENT AG_LAND DELETE WBATTAGL None 19930325 1457 None DOCUMENT AG_LAND UPDATE WBATTAGL None 19930325 1546 None DOCUMENT AG_LAND UPDATE WBATTAGL None 19930325 1604 None DOCUMENT AG_LAND UPDATE WBATTAGL None 19930325 1607 None DOCUMENT AG_LAND UPDATE WBATTAGL None 19930325 1609 None DOCUMENT AG_LAND UPDATE WBATTAGL None 19930329 0931 None DOCUMENT AG_LAND UPDATE WBATTAGL None 19930330 1002 None EXPORT COVER AG_LAND AG_LAND None 19930330 1045 None COPY /ARC3/EPA1/CENSUS/AG_LAND AG_LAND None 19941222 1053 None PROJECTDEFINE COVER AG_LAND None 19941222 1057 None DOCUMENT AG_LAND UPDATE WBATTAGL None 19941222 1739 None DOCUMENT AG_LAND UPDATE WBATTAGL None 19941223 0937 None EXPORT COVER AG_LAND AG_LAND None 19941223 1146 None DOCUMENT AG_LAND UPDATE WBATTAGL None 19941227 1252 None DOCUMENT AG_LAND UPDATE WBATTAGL None 19941230 1125 None MNEGRI IMPORT COVER AG_LAND.E00 AG_LAND None 19950308 1150 None Unspecified None 19950308 1202 None MNEGRI EXPORT COVER AG_LAND AG_LAND.E00 None 19950309 1643 None MNEGRI ARCSDTS AG_LAND AG_LAND.TAR.GZ PREF None 19950309 1700 None MNEGRI EXPORT COVER AG_LAND /SCRATCH_AREA1/MNEGRI/AG_LAND.E00 NONE None 19950919 1522 None MNEGRI EXPORT COVER /DSDL1/CUSA/TILES/CUSA/AG_LAND AG_LAND.E00 None 19960624 0832 None MNEGRI EXPORT COVER /DSDL1/CUSA/TILES/CUSA/AG_LAND AG_LAND.E00 None 19960625 1101 None Vector Point 4787 String 11926 GT-polygon composed of chains 4788 Albers Conical Equal Area 29.5 45.5 -96 23 0.0 0.0 coordinate pair 1.0 1.0 METERS Unknown Clarke 1866 6378206.4 294.98 AG_LAND.PAT Polygon attribute table ARC/INFO file AREA Area of polygon in square coverage units (meters) Computed Positive real numbers unspecified unspecified PERIMETER Perimeter of polygon in coverage units (meters) Computed Positive real numbers unspecified unspecified AG_LAND# Internal feature number Computed Sequential unique positive integer unspecified unspecified AG_LAND-ID User-assigned feature number User-defined Integer unspecified unspecified FIPS 5-digit county FIPS code Federal Information Processing Standard 01001 - 56998, none = 0 unspecified unspecified ST two-character state abbreviation U.S. Postal Service AL - WY, none = blank unspecified unspecified CNTYNAME County name U.S. Geological Survey Files upper-case alphanumeric, none = blank unspecified unspecified PLYTYPE polygon type: 0=county land, others are lakes, estuaries, etc. see narrative 0-4,9 unspecified unspecified WORKB variable used for data processing n/a any integer unspecified unspecified AREA.ACRES total county land area (all polygons) in acres calculated from areas of polygons with like FIPS code and PLYTYPE=0 numeric values greater than 0, missing = -99.000 unspecified unspecified CA0398 Farms, 1987 (number) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0400 Land in farms, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified PCT0400 Percent of county as land in farms, 1987 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99.000 unspecified unspecified CA0401 Land in farms, 1982 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified PCT0401 Percent of county as land in farms, 1982 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99.000 unspecified unspecified CA0402 Average size of farm, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0460 Total cropland, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified PCT0460 Percent of county as total cropland, 1987 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99.000 unspecified unspecified CA0461 Total cropland, 1982 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified PCT0461 Percent of county as total cropland, 1982 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99.000 unspecified unspecified CA0464 Harvested cropland, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified PCT0464 Percent of county as harvested cropland, 1987 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99.000 unspecified unspecified CA0468 Cropland used only for pasture or grazing, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0476 Cropland in cover crops, not harvested and not pastured in acres, 1987 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0477 Cropland in cover crops, not harvested and not pastured, 1982 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0492 Total woodland, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified PCT0492 Percent of county as total woodland, 1987 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99.000 unspecified unspecified CA0496 Woodland pastured, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0500 Woodland not pastured, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0516 Pastureland, all types, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified PCT0516 Percent of county as pastureland, all types, 1987 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99.000 unspecified unspecified CA0523 Cropland placed under the conservation reserve program, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0612 Farms with irrigation, 1987 (number) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0613 Farms with irrigation, 1982 (number) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0614 Land in irrigated farms, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified PCT0614 Percent of county as land in irrigated farms, 1987 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99.000 unspecified unspecified CA0615 Land in irrigated farms, 1982 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0618 Harvested cropland, irrigated, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0619 Harvested cropland, irrigated, 1982 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0622 Other cropland, excluding cropland pastured, irrigated, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0623 Other cropland, excluding cropland pastured, irrigated, 1982 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0629 Irrigated land, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified PCT0629 Percent of county as irrigated land, 1987 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99.000 unspecified unspecified CA0632 Harvested cropland, irrigated, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA0636 Pastureland and other land, irrigated, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified CA3223 Land in orchards, total, 1987 (acres) U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99 unspecified unspecified PCT3223 Percent of county as land in orchards, total, 1987 U.S. Department of Commerce, 1989a numeric values greater than 0, missing = -99.000 unspecified unspecified FIPSST two-digit state FIPS code Federal Information Processing Standard 01 - 56, none = 0 unspecified unspecified FIPSCNTY three-digit county FIPS code Federal Information Processing Standard 001 - 998, none = 0 unspecified unspecified AG_LAND.AAT Line attribute table ARC/INFO file FNODE# Internal number of from-node Computed Sequential unique positive integer unspecified unspecified TNODE# Internal number of to-node Computed Sequential unique positive integer unspecified unspecified LPOLY# Internal number of polygon to left of arc Computed Sequential unique positive integer unspecified unspecified RPOLY# Internal number of polygon to right of arc Computed Sequential unique positive integer unspecified unspecified LENGTH Length of arc in coverage units (meters) Computed Positive real numbers unspecified unspecified AG_LAND# Internal feature number Computed Sequential unique positive integer unspecified unspecified AG_LAND-ID User-assigned feature number User-defined Integer unspecified unspecified BNDTYPE Boundary type see narrative 0-8 unspecified unspecified CENSUS ATTRIBUTES All census attributes were extracted from tabular data files provided by the U.S. Department of Commerce (1989a). Data are reported in either thousands of dollars, number; acres; or percent of county. Attribute names are keyed to field names found in the technical documentation of the the Census of Agriculture (U.S. Department of Commerce, 1989b). Specifically, the four-digit number at the end of the ARC/INFO item name matches the field-name numbers in the technical-documentation reference. Complete definitions of attributes and terms used in the census can be found in U.S. Department of Commerce (1989b; 1990). Thirty-seven atributes were added to the ARC/INFO coverage of agricultural land use estimates from the 1987 Census of Agriculture. The coverage name, attribute names, and short attribute descriptions are listed in table 1. Attribute names beginning with CA represent data fields transferred directly from the census tabular data files. Attribute names beginning with PCT are percent-of-county attributes, and represent relative intensities of an agricultural practice. Attributes reported as percent of county were calculated as the attribute value (in acres) divided by the county polygon area (in acres) multiplied by 100. Table 1. 1987 Census of Agriculture agricultural land use estimates coverage name, attribute names, and short attribute descriptions __________________________________________________________________________ AG_LAND--Coverage of agricultural-land estimates from the 1987 Census of Agriculture __________________________________________________________________________ Attribute name Description __________________________________________________________________________ CA0398 Farms, 1987 (number) CA0400 Land in farms, 1987 (acres) PCT0400 Percent of county as land in farms, 1987 CA0401 Land in farms, 1982 (acres) PCT0401 Percent of county as land in farms, 1982 CA0402 Average size of farm, 1987 (acres) CA0460 Total cropland, 1987 (acres) PCT0460 Percent of county as total cropland, 1987 CA0461 Total cropland, 1982 (acres) PCT0461 Percent of county as total cropland, 1982 CA0464 Harvested cropland, 1987 (acres) PCT0464 Percent of county as harvested cropland, 1987 CA0468 Cropland used only for pasture or grazing, 1987 (acres) CA0476 Cropland in cover crops, legumes, and soil-improvement grasses, not harvested and not pastured, 1987 (acres) CA0477 Cropland in cover crops, legumes, and soil-improvement grasses, not harvested and not pastured, 1982 (acres) CA0492 Total woodland, 1987 (acres) PCT0492 Percent of county as total woodland, 1987 CA0496 Woodland pastured, 1987 (acres) CA0500 Woodland not pastured, 1987 (acres) CA0516 Pastureland, all types, 1987 (acres) PCT0516 Percent of county as pastureland, all types, 1987 CA0523 Cropland placed under the conservation reserve program, 1987 (acres) CA0612 Farms with irrigation, 1987 (number) CA0613 Farms with irrigation, 1982 (number) CA0614 Land in irrigated farms, 1987 (acres) PCT0614 Percent of county as land in irrigated farms, 1987 CA0615 Land in irrigated farms, 1982 (acres) CA0618 Harvested cropland, irrigated, 1987 (acres) CA0619 Harvested cropland, irrigated, 1982 (acres) CA0622 Other cropland, excluding cropland pastured, irrigated, 1987 (acres) CA0623 Other cropland, excluding cropland pastured, irrigated, 1982 (acres) CA0629 Irrigated land, 1987 (acres) PCT0629 Percent of county as irrigated land, 1987 CA0632 Harvested cropland, irrigated, 1987 (acres) CA0636 Pastureland and other land, irrigated 1987 (acres) CA3223 Land in orchards, total, 1987 (acres) PCT3223 Percent of county as land in orchards, total, 1987 __________________________________________________________________________ Census estimates for counties represented by one polygon are equal to county totals. For counties described by more than one polygon, attribute values are provided for each polygon and are calculated as the county total multiplied by the ratio of the area of each county polygon divided by the total area of the county. A missing-value code of -99 is used when no census-attribute data are given for a county, and for all nonland-area polygons. A missing-value code in a county land polygon could indicate any of the following condition: --agricultural practice not present in county (for example, no corn grown in county) --data withheld because of census disclosure rules --data not available to census --data not published because county contains less than 10 farms --data not applicable COUNTY POLYGON ATTRIBUTES Each county is identified by a five-digit Federal Information Processing Standard (FIPS) code. The first two digits represent the state and the three remaining represent the county within State. County names (in upper case) and the two-character State abbreviation also are included. All polygons are coded by polygon type (PLYTYPE) as follows: 0 = U.S. land. 1 = Extensions of counties into the ocean and estuaries. Some boundaries may be arbitrary. 2 = U.S. Great Lakes. Some boundaries between counties may be arbitrary. 3 = Canadian Great Lakes. 4 = Canadian islands in Great Lakes, included for visual cartographic purposes. 9 = External polygon. All arcs are coded by boundary type (BNDTYPE) as follows: 0 = Coastline of United States. 1 = State-State border occurring on land. 2 = County-county border, within state, occurring on land. 3 = State-State border occurring on the ocean, an estuary, or a Great Lake. Some of these borders are arbitrary. 4 = County-county border, with State, but occurring on the ocean, an estuary, or a Great Lake. Some of these borders are arbitrary. 5 = International border occurring on land. 6 = International border occurring on water. 7 = Canadian shoreline of the Great Lakes. 8 = Arbitrary separation line between the Canadian portions of the Great Lakes. 9 = Closure line with the external polygon. This is arbitrary. All BNDTYPE values are determined from the adjoining polygons by the routine, INDEX_COUNTY.AML. The coverage is indexed (ARC: INDEXITEM) on FIPS code, State FIPS code, State abbreviation, county name, polygon type, and boundary type. Not Available U.S. Geological Survey Ask USGS - Water Webserver Team mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Export Full coverage Win zipped 3.83 MB http://water.usgs.gov/GIS/dsdl/ag_land.e00.zip Export Full coverage Gun zipped 3.83 MB http://water.usgs.gov/GIS/dsdl/ag_land.e00.gz SDTS Full coverage zipped 3.01 MB http://water.usgs.gov/GIS/dsdl/ag_land.sdts.tgz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ag_land FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998