U.S. Dept of Commerce, Bureau of Census
1993
1:100,000-scale Counties of the United States
1.1
vector digital data
Reston, Virginia
U.S. Geological Survey
http://water.usgs.gov/lookup/getspatial?county100
This is a coverage of the county boundaries of the conterminous United
States (AK, HI and Puerto Rico are available separately). The lines were
extracted from U.S. Census TIGER/line files using an AML program (see 4.),
written by Doug Nebert and Mark Negri, running on two Data General 6220
servers.
Counties
Boundaries
United States
This coverage is intended as a basemap for any desired GIS application.
Procedures_Used:
The data was extracted from Census TIGER/line files stored on 38 compact
discs (CD) using the following four step procedure:
1) Copy the data off the TIGER/line CD onto magnetic disc of a Data General
6220 server. The data was copied on a per state basis under an
individual directory.
2) Run the data through ARCTIGER.AML which goes as follows:
/* ARCTIGER.AML - An aml that will extract county outer boundary lines from
/* Census TIGER line files and MAPJOIN these lines to create a
/* full state coverage of county lines. Directory must contain
/* albers.prj Projection file.
/* --------------------------------------------------------------------------
/* Read county list from a particular state and set # of iterations to the
/* # of counties.
&args stno state
&setvar countycount [filelist /gis/%stno%[unquote '/*'] county.list -full -dir]
&setvar fileunit [open county.list ostat -r]
&do i = 1 &to %countycount%
/* Read individual TIGER files.
&setvar cty [locase [read %fileunit% rstat]]
&setvar xyz [filelist %cty%/tgr* tigerfiles -full -file]
&setvar filunit [open tigerfiles ostat -r]
&sv fname [locase [read %filunit% rstat]]
&sv statecounty [substr %fname% 16 5]
/* Block TIGER file record 1 and perform SORTTIGER.
&if [after %fname% .] = f21 &then
&sys dd if=%fname% of=line%statecounty% ibs=228 obs=228 cbs=228 conv=unblock
sorttiger 1 line%statecounty% lnsrt%statecounty%
&sv fname [locase [read %filunit% rstat]]
/* Block TIGER file record 2 and perform SORTTIGER.
&if [after %fname% .] = f22 &then
&sys dd if=%fname% of=shape%statecounty% ibs=208 obs=208 cbs=208 conv=unblock
&sv cerr1 [close %filunit%]
sorttiger 2 shape%statecounty% shpsrt%statecounty%
/* Create ARC coverage from blocked and sorted TIGER files using the
/* TIGERARC command.
tigerarc precensus geo%statecounty% lnsrt%statecounty% shpsrt%statecounty%
&sys rm line%statecounty% lnsrt%statecounty% shape%statecounty% ~
shpsrt%statecounty%
build geo%statecounty% line
/* Extract items geo%statecounty%-ID and SOURCE from geo%statecounty%.ACODE
/* datafile and add to geo%statecounty%.AAT
pullitems [translate geo%statecounty%].ACODE PULL
[translate geo%statecounty%]-ID
SOURCE
END
joinitem [translate geo%statecounty%].AAT PULL ~
[translate geo%statecounty%].AAT [translate geo%statecounty%]-ID ~
[translate geo%statecounty%]-ID ORDERED
tables
$kill PULL
q stop
/* Project geo%statecounty% into Albers equal area to create prj%statecounty%,
/* BUILD with LINE, CLEAN with 10 10 POLY and extract outer boundary to create
/* cov%statecounty%.
project cover geo%statecounty% prj%statecounty% albers.prj
build prj%statecounty% line
clean prj%statecounty% gcl%statecounty% 10 10 poly
reselect gcl%statecounty% cov%statecounty% line
RESELECT LPOLY# = 1 OR RPOLY# = 1
[unquote ' ']
n
n
build cov%statecounty% line
build cov%statecounty% poly
/* ADDITEM STATECTY and populate cov%statecounty%.PAT with %statecounty%,
/* calculate cov%statecounty%-ID in the cov%statecounty%.AAT to equal SOURCE
/* so pseudonodes can be deleted with UNSPLIT in ARCEDIT, then set all
/* cov%statecounty%-ID's in cov%statecounty%.AAT to equal
/* cov%statecounty%#.
createlabels cov%statecounty%
build cov%statecounty% poly
additem [translate cov%statecounty%].PAT [translate cov%statecounty%].PAT ~
STATECTY 5 5 I
tables
select [translate cov%statecounty%].PAT
reselect [translate cov%statecounty%]# GT 1
calc STATECTY = %statecounty%
select [translate cov%statecounty%].AAT
reselect SOURCE CN ' '
calc [translate cov%statecounty%]-ID = 0
aselect
reselect SOURCE CN 'A'
calc [translate cov%statecounty%]-ID = 1
aselect
reselect SOURCE CN 'B'
calc [translate cov%statecounty%]-ID = 2
aselect
reselect SOURCE CN 'C'
calc [translate cov%statecounty%]-ID = 3
aselect
reselect SOURCE CN 'D'
calc [translate cov%statecounty%]-ID = 4
aselect
reselect SOURCE CN 'E'
calc [translate cov%statecounty%]-ID = 5
aselect
reselect SOURCE CN 'F'
calc [translate cov%statecounty%]-ID = 6
aselect
reselect SOURCE CN 'G'
calc [translate cov%statecounty%]-ID = 7
q stop
idedit cov%statecounty% line
arcedit
ec cov%statecounty%
ef arcs
select all
unsplit
save
quit
build cov%statecounty% line
build cov%statecounty% poly
tables
select [translate cov%statecounty%].AAT
calc [translate cov%statecounty%]-ID = [translate cov%statecounty%]#
q stop
idedit cov%statecounty% line
kill geo%statecounty% all
kill prj%statecounty% all
kill gcl%statecounty% all
&end
&setvar cerr2 [close %fileunit%]
&sys rm county.list
&sys rm tigerfiles
/* MAPJOIN the individual county coverages to form a full state coverage.
&setvar covercount [filelist cov* covlist -cover -network]
&setvar fileunit [open covlist ostat -r]
mapjoin %state% net features
&do i = 1 &to %covercount%
&setvar cover [read %fileunit% rstat]
%cover%
&end
end
&sys rm covlist
/* Set SOURCE codes equal to cover-ID so pseudonodes can be removed with
/* UNSPLIT in ARCEDIT.
tables
select [translate %state%].AAT
reselect SOURCE CN ' '
calc [translate %state%]-ID = 0
aselect
reselect SOURCE CN 'A'
calc [translate %state%]-ID = 1
aselect
reselect SOURCE CN 'B'
calc [translate %state%]-ID = 2
aselect
reselect SOURCE CN 'C'
calc [translate %state%]-ID = 3
aselect
reselect SOURCE CN 'D'
calc [translate %state%]-ID = 4
aselect
reselect SOURCE CN 'E'
calc [translate %state%]-ID = 5
aselect
reselect SOURCE CN 'F'
calc [translate %state%]-ID = 6
aselect
reselect SOURCE CN 'G'
calc [translate %state%]-ID = 7
q stop
idedit %state% line
arcedit
ec %state%
ef arcs
select all
unsplit
save
quit
build %state% poly
build %state% line
/* Set cover-ID's back to equal cover#.
tables
select [translate %state%].AAT
calc [translate %state%]-ID = [translate %state%]#
q stop
idedit %state% line
/* Remove sliver polygons while retaining SOURCE codes.
createlabels %state% 1001
build %state% poly
pullitems [translate %state%].AAT PULL
[translate %state%]-ID
SOURCE
END
eliminate %state% el%state% # poly
RESELECT [translate %state%]-ID > 1000
[unquote ' ']
n
n
build el%state% line
build el%state% poly
kill %state% all
rename el%state% %state%
joinitem [translate %state%].AAT PULL [translate %state%].AAT ~
[translate %state%]-ID [translate %state%]-ID LINEAR
tables
$kill PULL
q stop
&return
3) Visually check the data for accuracy against the 1:2,000,000 county
boundaries. When discrepancies occured, the data was checked against
USGS 1:100,000 quad maps.
4) Add data from counties which were missing from the TIGER/line CDs or
that could not be converted on the Data General. This was performed
by several methods. Each method is followed by a list of counties
by STATECTY code in which the data was inserted by that method.
a) Missing or non-convertible counties which were completely surrounded
by county boundaries that did convert had a label added to their
blank polygon which was tagged with the appropriate STATECTY code.
Missing Counties:
Alabama: 01009, 01013, 01025, 01051, 01053, 01071, 01093, 01121,
01125.
Texas: 48105, 48107, 48109, 48155, 48157, 48159.
Utah: 49019, 49027, 49033, 49045, 49053.
Non-convertible Counties:
California: 06001, 06017, 06025, 06049, 06095.
Florida: 12105.
Georgia: 13289, 13305.
Louisiana: 22019, 22079, 22089.
Maine: 23019.
Minnesota: 27055, 27099.
Nevada: 32031.
New York: 36071.
Texas: 48027, 48037, 48121, 48453.
b) Non-convertible counties with a shoreline that were delineated by
using the adjacent inland county boundaries and a shoreline obtained
from the USGS 1:2,000,000 data set with a buffer to match the buffer
of the adjacent Census shoreline. The shorelines of these counties
have a SOURCE code in the .AAT file of 'X'.
Alabama: 01097.
California: 06037, 06073.
Florida: 12009, 12071, 12099.
Georgia: 13051.
Louisiana: 22075.
North Carolina: 37053.
South Carolina: 45019.
Texas: 48167, 48245, 48261.
c) The following county boudaries were obtained by processing Census
TIGER/line files obtained from the U.S. Environmental Protection
Agency (The same procedures were used on this data):
Alabama: 01027, 01035, 01037, 01059, 01073, 01095, 01099, 01115,
01123, 01129, 01133.
Texas: 48101, 48103, 48153.
Utah: 49023, 49025, 49037, 49043, 49047.
d) The following county boudaries were obtained by processing Census
TIGER/line files on an IBM RS6000:
Florida: 12105.
South Carolina: 45053.
Texas: 48253.
Revisions:
Revision 1.1, 8/16/94. Made a coding change as discovered by EPA:
1. A New Mexico county polygon coded FIPS = 35006, La Paz should
be FIPS = 35006, Cibola.
Revision by Mark Negri, mnegri@qvarsx.er.usgs.gov, 703-648-5613
Process_Date 8/16/94
Reviews_Applied_to_Data:
Post-processing data review performed as mentioned above by Mark Negri.
Related_Spatial_and_Tabular_Data_Sets:
Other_References_Cited:
Lines with SOURCE code type 'X' were obtained by bufferring USGS
1:2,000,000-scale digital map of counties, 1985.
Notes:
1990
(Here you put information defining how the time period of
content information, on the DOC file, was determined)
(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
-127.97569044
-65.25507606
48.27065081
22.76830813
None
county boundaries
county
Conterminous United States
inlandWaters
None
Conterminous United States (AK, HI & Puerto Rico available separately)
None
None
None
None
(describe any restrictions or legal prerequisites for accessing
the data set. Put "None" if there are no restrictions)
Lines with a SOURCE code of 'A' are from Census 1980 GBF/DIME-files and
have a much poorer resolution than lines of all other SOURCE code types.
'A' line types tend to be mostly in urban areas.
There are no shorelines in this coverage. Coastal counties have their
boundaries extended approximately 3 miles into the ocean. Counties that
bound the Great Lakes and other large inland waterbodies have their
boundaries extended proportionally into the waterbody.
http://water.usgs.gov/GIS/browse/county100.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
U.S. Geological Survey, Water Resources Div. (WRD)'
Computer Support
IT Specialist,
' Spatial Data Suppor Team'
Geographic Information Unit
Unspecified
Reston
VA
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.)
10 meters
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
Unspecified
100,000-scale
Unspecified
0000
Unspecified
Unspecified
Unspecified
ELIMINATE USA ELUSA # POLY
None
19910606
1457
None
BUILD ELUSA LINE
None
19910606
1458
None
BUILD ELUSA POLY
None
19910606
1619
None
RENAME ELUSA USA
None
19910606
1619
None
RENAME USA COUNTY100
None
19910606
1724
None
IDEDIT COUNTY100 LINE
None
19910610
0706
None
ARCEDIT /GIS/DSDL/COUNTY100
None
19910610
0712
None
BUILD COUNTY100 POLY
None
19910610
0759
None
BUILD COUNTY100 LINE
None
19910610
0800
None
IDEDIT COUNTY100 LINE
None
19910610
0802
None
DOCUMENT COUNTY100 CREATE MNEGRI
None
19910611
1048
None
DOCUMENT COUNTY100 UPDATE MNEGRI
None
19910613
1639
None
ARCEDIT /GIS/DSDL/COUNTY100
None
19910619
0718
None
BUILD COUNTY100 LINE
None
19910619
0721
None
BUILD COUNTY100 POLY
None
19910619
0847
None
ARCEDIT /GIS/DSDL/COUNTY100
None
19910620
0809
None
BUILD COUNTY100 LINE
None
19910620
0816
None
BUILD COUNTY100 POLY
None
19910620
0918
None
ARCEDIT /GIS/DSDL/COUNTY100
None
19910621
1208
None
ARCEDIT /GIS/DSDL/COUNTY100
None
19910621
1211
None
BUILD COUNTY100 LINE
None
19910621
1217
None
BUILD COUNTY100 POLY
None
19910621
1312
None
EXPORT COVER COUNTY100 COUNTY100.E00
None
19910621
1506
None
DOCUMENT COUNTY100 UPDATE MNEGRI
None
19910624
0813
None
COPY /GIS/DSDL/COUNTY100 /DSDL/DATALIB/CUSA/TILES/CUSA/COUNTY100
None
19910913
0949
None
COPY /GIS/DSDL/DATALIB/CUSA/TILES/CUSA/COUNTY100 COUNTY100
None
19910913
1016
None
COPY /GIS/DSDL/COUNTY100 /DSDL/DATALIB/CUSA/TILES/CUSA/COUNTY100
None
19910913
1026
None
DOCUMENT COUNTY100 UPDATE MNEGRI
None
19910918
1318
None
COPY COUNTY100 COUNTY100X
None
19910923
1126
None
RENAME COUNTY100X COUNTY100
None
19910923
1128
None
EXPORT COVER /GIS/DSDL/DATALIB/CUSA/TILES/CUSA/COUNTY100 COUNTY100.E00
None
19911108
1644
None
EXTERNALALL
None
19911126
1527
None
EXPORT COVER /DSDL/DATALIB/CUSA/TILES/CUSA/COUNTY100 COUNTY100.E00
None
19911204
1023
None
DOCUMENT COUNTY100 UPDATE MNEGRI
None
19911230
0852
None
EXPORT COVER /DSDL/DATALIB/CUSA/TILES/CUSA/COUNTY100 COUNTY100.E00
None
19920108
2359
None
EXPORT COVER COUNTY100 COUNTY100.E00
None
19920115
1004
None
DOCUMENT COUNTY100 UPDATE MNEGRI
None
19920214
0814
None
IMPORT COVER COUNTY100.E00 COUNTY100
None
19920929
1413
None
COPY COUNTY100 /DSDL1/CUSA/TILES/CUSA/COUNTY100
None
19920929
2132
None
FOOTPRINT COUNTY100 BND COUNTY100.BND FOOTPRINT
None
19920930
0919
None
EXPORT COVER COUNTY100 COUNTY100.E00
None
19930106
1048
None
EXTERNALALL
None
19930106
1111
None
EXTERNALALL
None
19930106
1115
None
EXPORT COVER /DSDL1/CUSA/TILES/CUSA/COUNTY100 COUNTY100.E00
None
19930113
0959
None
DOCUMENT COUNTY100 UPDATE MNEGRI
None
19940816
1216
None
DOCUMENT COUNTY100 UPDATE MNEGRI
None
19940816
1227
None
EXPORT COVER /DSDL1/CUSA/TILES/CUSA/COUNTY100 COUNTY100_CUSA.E00
None
19940816
1525
None
EXPORT COVER /DSDL1/CUSA/TILES/CUSA/COUNTY100 WAIS/COUNTY100_CUSA.E00
None
19940817
1007
None
JPORTER DOCUMENT COUNTY100 DELETE JPORTER
None
19950117
1043
None
JPORTER DOCUMENT COUNTY100 COPY /HOME/GIS/LANFEAR/NEWDOC/COVERS/COUNTY100 JPORTE
None
19950117
1044
None
JPORTER EXPORT COVER /DSDL1/CUSA/TILES/CUSA/COUNTY100 COUNTY100
None
19950120
1310
None
JPORTER DOCUMENT COUNTY100 DELETE JPORTER
None
19950223
1151
None
JPORTER DOCUMENT COUNTY100 COPY /HOME/GIS/LANFEAR/NEWDOC/COVERS/COUNTY100 JP
None
19950223
1153
None
MNEGRI EXPORT COVER COUNTY100 COUNTY100.E00
None
19950302
1319
None
MNEGRI EXPORT COVER COUNTY100 COUNTY100.E00
None
19950613
1452
None
MNEGRI EXPORT COVER COUNTY100 /SCRATCH_AREA1/MNEGRI/COUNTY100.E00 NONE
None
19950919
1552
None
Vector
Point
3167
String
63040
GT-polygon composed of chains
3168
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
COUNTY100.PAT
Polygon attribute table
Census TIGER/line files
AREA
Area of polygon in square coverage units
Computed
Positive real numbers
unspecified
unspecified
PERIMETER
Perimeter of polygon in coverage units
Computed
Positive real numbers
unspecified
unspecified
COUNTY100#
Internal feature number
Computed
Sequential unique positive integer
unspecified
unspecified
COUNTY100-ID
User-assigned feature number
User-defined
Integer
unspecified
unspecified
STATECTY
State/county code
Federal Information Processing Standard
01001-56999, none = 0
unspecified
unspecified
ST
State abbreviation
U.S. Postal Service
AL - WY, none = blank
unspecified
unspecified
CNTYNAME
County name
U.S. Geological Survey files
Upper-case alphanumeric
unspecified
unspecified
POLYTYPE
Polygon type
See narrative
0-2
unspecified
unspecified
FIPS:ST
Standard 2-digit FIPS State code
Federal Information Processing Standard
01 - 56
unspecified
unspecified
FIPS:CO
Standard 3-digit FIPS County code
Federal Information Processing Standard
001 - 999
unspecified
unspecified
FIPS
Standard 5-digit FIPS code
Federal Information Processing Standard
01001-56999, none = 0
unspecified
unspecified
COUNTY100.AAT
Arc attribute table
Census TIGER/line files
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
Computed
Positive real numbers
unspecified
unspecified
COUNTY100#
Internal feature number
Computed
Sequential unique positive integer
unspecified
unspecified
COUNTY100-ID
User-assigned feature number
User-defined
Integer
unspecified
unspecified
SOURCE
Census TIGER/line Source code
Census TIGER/line files
'A - D, '' '' (blank) & X'
unspecified
unspecified
BNDYTYPE
Boundary type
See narrative
0-8
unspecified
unspecified
Each county is identified by a 5-digit STATECTY code derived from the
Federal Information Processing Standard (FIPS) code. The first 2 digits
represent the state and the remaining 3 digits represent the county within
that state.
All polygons are encoded by a POLYTYPE code as follows (As of 06/24/91, this
ITEM has not been populated yet):
0 - U.S. Land.
1 - Extensions of counties into the ocean and estuaries. Some boundaries
between counties may be arbitrary.
2 - U.S. Great Lakes. Some boundaries between counties may be arbitrary.
Each line has a SOURCE code showing where Census obtained the data, except
lines with a SOURCE code of 'X'. These lines were added after the TIGER/
line files had been processed (see 4.). The following is a list of SOURCE
code types:
Value Description
------- ------------------------------------
(Blank) Nondocumented
A 1980 GBF/DIME-file
B USGS 1:100,000-Scale DLG-3 File
C Other USGS Map
D Census Bureau Precensus Update
X USGS-WRD Shoreline Buffer
Using the FREQUENCY command, the SOURCE code line types break down as
follows:
FREQUENCY SOURCE LENGTH
--------- ------ ------------
89 44,744.740
2,674 A 33111756.000
26905 B 86667344.000
1 C 8,457.944
33346 D 2.456652E+08
19 X 1450036.000
All arcs are encoded by a BNDYTYPE (boundary type) code as follows (As of
06/24/91, codes 0, 3 and 4 have not been populated yet):
0 - Coastline of the 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, estuary, or a Great Lake.
Some of these borders are arbitrary.
4 - County-county border, within state, occurring on the ocean, estuary, or
a Great Lake. Some of these borders are arbitrary.
5 - International border occurring on land.
6 - International border occurring on water.
7 - U.S. Census shoreline buffer (approximately 3 miles).
8 - USGS-WRD shoreline buffer (SOURCE code 'X').
As of 06/21/91, the frequency of BNDYTYPE is as follows:
Using the FREQUENCY command, the BNDYTYPE code line types break down as
follows (As of 06/21/91):
FREQUENCY BNDYTYPE LENGTH
--------- -------- ------------
6,354 1 41037204.000
55739 2 3.061601E+08
703 5 7541641.000
63 6 1824460.000
162 7 8934106.000
19 8 1450036.000
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
48
http://water.usgs.gov/GIS/dsdl/county100.e00.zip
Export
Full coverage
gun zipped
48
http://water.usgs.gov/GIS/dsdl/county100.e00.gz
Export
Full coverage
tar zipped
48
http://water.usgs.gov/GIS/dsdl/county100.e00.tgz
SDTS
Full coverage
tar zipped
41
http://water.usgs.gov/GIS/dsdl/county100.sdts.tgz
None. This dataset is provided by USGS as a public service.
20041108
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://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+county100
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998