Mr. M. Negri from USGS and dataset modifications by Mr. Edwin Yockey, USDA Forest Service
2000
scounty100
vector digital data
Salt Lake City, UT
USDA Forest Service
file name: scounty100.shp
<http: //www.srs.fs.usda.gov/sustain/data/>
This coverage was identified on the USGS Water Resources NSDI Node site at http://nsdi.usgs.gov. The coverage contains the county boundaries of the continental United States. These boundaries were derived from the Digital Line Graph (DLG) files representing the 1:100,000 scale map in the National Atlas of the United States. The data was then modified by USDA Forest Service Personnel for use in the Southern Forest Resource Assessment and exported to a shapefile (please see process description p.3).
This shapefile is used as a base map for a variety of applications.
The included FIPS and states within the coverage are:
1 AL, 5 AR, 12 FL, 13 GA, 21 KY, 22 LA, 28 MS, 37 NC, 40 OK, 45 SC, 47 TN, 48 TX, 51 VA
2000
publication date
Unknown
-108.021737
-74.773082
39.961128
23.664456
counties
boundaries
Administrative and political boundaries
None
None. The USDA Forest Service does not guarantee the accuracy of this data.
USDA-Forest Service
Mr. John M. Pye
Ecologist
mailing and physical address
USDA Forest Service, SRS4851
3041 E. Cornwallis Road
Research Triangle Park
NC
27709
USA
(919).549.4013
jpye@fs.fed.us
1) USGS- the original county boundary coverage.
2) USDA Forest Service- modifications to data for use in the Southern Forest Resource Assessment (SFRA).
Unclassified
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.3.0.800
All counties are accurately labeled.
Polygon topology is present.
Assessment-standard projection:
Projection: Albers Equal Area
Units: Meters
Spheroid: GRS80
Datum: NAD83
First Standard Parallel: 27 degrees 30 minutes
Second Standard Parallel: 37 degrees 30 minutes
Central Meridian: -90 degrees 00 minutes
Latitude of Origin: 25 degrees 00 minutes
False Easting: 0.0
False Northing: 0.0
All polygons have been reviewed for attribution accuracy. A quality control inspection has been performed to eliminate any missing or duplicate labels in the shapefile.
All linear delineations are within National Map Accuracy Standards.
+/- 50.8 meters
All linear delineations are within National Map Accuracy Standards.
+/- 25 meters
Mr. M. Negri, USGS
1990
county100.e00.gz
Reston, Virginia
USGS
<http://nsdi.usgs.gov>
1:100,000
Arc Info export coverage
1990
publication date
USGS 1:100,000 county coverage
This coverage was identified on the USGS Water Resources NSDI Node site at http://nsdi.usgs.gov. The coverage contains the county boundaries of the continental United States. These boundaries were derived from the Digital Line Graph (DLG) files representing the 1:100,000 scale map in the National Atlas of the United States. The data was then modified by USDA Forest Service Personnel for use in the Southern Forest Resource Assessment (SFRA) and exported to a shapefile.
USGS Process Description:
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,
and 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.
Reviews_Applied:
Post-processing data review performed as mentioned above by
Mark Negri.
Data Modifications by USDA Forest Service Staff:
Sept. & Oct.-2000:
The coverages were downloaded by USDA Forest Service personnel on 22-Sep-2000 in compressed Arc Info Export format along with their associated metadata. The coverages were then reprojected to match Assessment standard Albers using the Arc Info PROJECT command, the items were adjusted to one record per county or municipality, and sliver polygons were removed. The coverage was then subsetted to the thirteen Southern states of the Assessment using Arc View's Theme Query tool and state FIPS code, then exported as shapefiles.
17-Oct.-2000
USDA-Forest Service
Mr. Edwin Yockey
GIS Specialist
mailing address
PO Box 2680
Asheville
NC
28801
USA
(828).257.4857
(828).257.4856
eyockey@fs.fed.us
Metadata imported.
L:\forest\sfra\Revised_Apr_del\metadata delivery for webpage\state_cov_albers\sstates100.xml
Vector
G-polygon
1342
Albers Conical Equal Area
27.500000
37.500000
-90.000000
25.000000
0.000000
0.000000
coordinate pair
0.004096
0.004096
meters
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
scounty100
FID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
AREA
The size of the shape in shapefile units.
ESRI
PERIMETER
The perimeter of the shape in shapefile units.
ESRI
COUNTY100_
Internal Feature Number.
Computed
STATECTY
User attributed state and county FIPS code.
US Geological Survey
ST
Two letter abbreviation for the state (i.e. TX).
US Geological Survey
CNTYNAME
User attributed county name (i.e. FREDERICK).
US Geological Survey
POLYTYPE
User defined attribute (i.e. 0 is US Land).
US Geological Survey
FIPS_ST
User attributed FIPS code for the state.
US Geological Survey
FIPS_CO
User attributed FIPS code for the county.
US Geological Survey
FIPS
User attributed state and county FIPS code.
US Geological Survey
USDA-Forest Service
Mr. John M. Pye
Ecologist
mailing and physical address
USDA Forest Service, SRS4851
3041 E. Cornwallis Rd.
Research Triangle Park
NC
27709
USA
(919).549.4013
jpye@fs.fed.us
Downloadable Data
Data Content and Use Disclaimer
The USDA Forest Service, Southern Forest Resource Assessment or SFRA, provides data to users of digital geographic data. The USDA Forest Service is in no way condoning or endorsing the application of these data for any given purpose. It is the sole responsibility of the user to determine whether or not the data is suitable for the intended purpose. It is also the obligation of the user to apply the data in an appropriate and conscientious manner. The USDA Forest Service provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. Much of the USDA Forest Service data is based on and maintained with Arc Info and Arc View Software developed by the Environmental Systems Research Institute (ESRI). In addition, much of the information presented uses conventions and terms popularized by Arc Info and Arc View and their user community. USDA Forest Service in no way represents the interests of ESRI nor acts as an agent for them.
.shp
Arc View Shapefile
Arc View
Counties within the continental United States
zip file
2.562
20041118
USDA Forest Service
Mr. John Pye
Ecologist
mailing and physical address
USDA Forest Service, SRS4851
3041 Cornwallis Rd.
Research Triangle Park
NC
27709
USA
(919).549.4013
jpye@fs.fed.us
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None
None
Unclassified
http://www.srs.fs.usda.gov/econ
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile