Hitt, K.J.
1992
1990 point population coverage for the Conterminous United States
maps and digital data
Reston, Virginia
U.S. Geological Survey
http://water.usgs.gov/lookup/getspatial?uspop90
This is a point coverage of the 1990 Census of Population and
Housing for the conterminous United States. (Alaska and Hawaii are
available separately). The coverage contains the location of
population points retrieved at the block group summary level and
shows the total number of persons and housing units enumerated in
the "100 percent processing" component of the decennial census.
The data was extracted from CD-ROMs containing Public Law 94-171
counts. These are counts that States use in redistricting.
This coverage is intended to be used for any desired GIS
application involving total population or housing.
The National Water Quality Assessment program intends to use the
population data to indicate areas of suburban and urban
development, which will have an impact on water quality.
Related_Spatial_and_Tabular_Data_Sets --
The boundaries of the geographic area that each point represents
can be extracted from the Census 1990 TIGER/line files.
Other_References_Cited --
(The P.L. 94-171 CD-ROMs come with on-line documentation, which was
the source of much of the information described here.)
Bureau of the Census, 1991a, Census of population and housing, 1990:
Public Law 94-171 data (United States) (machine readable data files):
Washington, D.C., The Bureau (producer and distributor).
Bureau of the Census, 1991b, Census of population and housing, 1990:
Public Law 94-171 data on-line technical documentation: Washington,
D.C., The Bureau.
19900101
ground condition
None planned
-127.77415222
-65.38475115
48.25931107
22.89316358
None
United States
Population
Housing
inlandWaters
None
Conterminous United States
None
None
None
1990
None
Performing any kind of spatial relationship with this coverage will have
an undetermined margin of error since each point represents data from a
polygon whose boundaries are not present.
h2oteam
U.S. Geological Survey, Water Resources Div. (WRD)
Network Information Products Coordinator for WRD
mailing address
12201 Sunrise Valley Drive, MS-439
Reston
VA
20192
USA
1-888-275-8747
703-648-5295
h2oteam@usgs.gov
7:30am-4:00pm EST
Please contact thru email
http://water.usgs.gov/GIS/browse/uspop90.gif
Illlustration of data set
GIF
dgux, 5.4R3.10, AViiON UNIX, ARC/INFO version 7.0.4
Attribute accuracy is described, where present, with each
attribute defined in the Entity and Attribute Section.
Point features present.
2000000
1990
This coverage basically is the same as the earlier point population
coverage, also called USPOP90, that Mark Negri and Howard Perlman put
together. The earlier version did not contain the housing unit data.
The earlier version also contained voting district as part of the CENSUS_I
this coverage does not.
1995
Revision 1.2 Corrected the definition of REDEFINED ITEM CENPLACE
in the USPOP90.PAT INFO file from a 3,3,I ITEM to a 4,4,I ITEM.
Revision by Mark Negri mnegri@qvarsx.er.usgs.gov, 703-648-5613
19940922
The data was extracted from CD-ROMs containing Public Law 94-171
population and housing unit counts using the "EXTRACT" program
provided on the disks. This is a menu-driven program that allows
the user to select the geographic level of detail and fields to be
extracted from the data base. The data is organized by state.
The summary level of block group (740) was chosen. The following
items were selected from the data base:
>STUSAB----State/US abbreviation (2-letter Postal code)
>BLCKGR----Block group
>TRACTBNA--Census tract/block numbering area
>CNTY------County
>COUSUBCE--County subdivision (Census)
>PLACECE---Place (Census)
>STATEFP---State (FIPS)
>AREALAND--Land area measurement
>AREAWAT---Water area measurement
>INTPTLAT--Internal point (latitude)
>INTPTLNG--Internal point (longitude)
>HU100-----Housing unit count
>POP100----Population count
The output from the program was a flat file of data for each state.
The flat files were converted by the CREATEPOINT.AML into ARC/INFO
point coverages for each state. Land and water area measurements,
which were reported in thousandths of square kilometers in the
original data, were changed to square kilometers in the coverages.
The state coverages were appended into one coverage for the
conterminous United States.
19950919
Point
Point
523205
Albers Conical Equal Area
29.5
45.5
-96
23
0.0
0.0
coordinate pair
1.0
1.0
meters
USPOP90.PAT
1990 Census of population and housing
P.L. 94-171
AREA
Degenerate area of point
Assigned
0
unspecified
unspecified
PERIMETER
Degenerate perimeter of point
Assigned
0
unspecified
unspecified
USPOP90#
Internal feature number
Computed
Sequential unique positive integer
unspecified
unspecified
USPOP90-ID
User-assigned feature number
User-defined
Integer
unspecified
unspecified
ST
State postal abbreviation
U.S. Postal Service
AL-WY
unspecified
unspecified
CENSUS_ID
Census geographic area classification code
P.L. 94-171
No restrictions
unspecified
unspecified
AREA_WATER
Water area measurement
P.L. 94-171
No restrictions
unspecified
unspecified
AREA_LAND
Land area measurement
P.L. 94-171
No restrictions
unspecified
unspecified
POP90
1990 population count as determined by 100 percent processing
P.L. 94-171
No restrictions
unspecified
unspecified
HU90
1990 housing unit count as determined by 100 percent processing
P.L. 94-171
No restrictions
unspecified
unspecified
BG
Block group
P.L. 94-171
No restrictions
unspecified
unspecified
CTBNA
Census tract/Block numbering area
P.L. 94-171
No restrictions
unspecified
unspecified
COUNTY
County FIPS code
Federal Information Processing Standard
FIPS
unspecified
unspecified
COUSUBCE
Census county subdivision
P.L. 94-171
No restrictions
unspecified
unspecified
CENPLACE
Census place
P.L. 94-171
No restrictions
unspecified
unspecified
STATE
State FIPS code
Federal Information Processing Standard
FIPS
unspecified
unspecified
>DATAFILE NAME: USPOP90.PAT 8/14/1992
>10 ITEMS: STARTING IN POSITION 1
>COL ITEM NAME WDTH OPUT TYP N.DEC ALTERNATE NAME
>1 AREA 4 12 F 3
>5 PERIMETER 4 12 F 3
>9 USPOP90# 4 5 B -
>13 USPOP90-ID 4 5 B -
>17 ST 2 2 C -
>19 CENSUS_ID 19 19 C -
>38 AREA_WATER 4 11 F 3
>42 AREA_LAND 4 11 F 3
>46 POP90 4 9 B -
>50 HU90 4 9 B -
>** REDEFINED ITEMS **
>19 BG 1 1 I -
>20 CTBNA 6 6 I -
>26 COUNTY 3 3 I -
>29 COUSUBCE 3 3 I -
>32 CENPLACE 3 3 I -
>36 STATE 2 2 I -
ST is the state postal abbreviation.
CENSUS_ID is a code for the geographic area. The 19-column code is
a combination of individual codes for block group, census
tract/block numbering area, county FIPS code, county subdivision,
place, and state FIPS code. The individual codes could have been
combined in any way. There is not necessarily any significance to
the order in which the codes are combined into CENSUS_ID.
The CENSUS_ID breaks down into the following subdivisions:
>CENSUS_ID 0 1
>columns 1234567890123456789
>
>X - Block Group (BG)
>XXXXXX - Census Tract/Block Numbering Area (CTBNA)
>XXX - FIPS County (COUNTY)
>XXX - County Subdivision (COUSUBCE)
>XXXX - Place (CENPLACE)
>XX - FIPS State (STATE)
>XXXXXXXXXXXXXXXXXXX - CENSUS_ID
Census block groups are the next to smallest geographic area in the
Bureau of the Census hierarchy of geographic presentation, which
is:
>United States
>Region
>Division
>State
>County
>County subdivision
>Census tract/Block numbering area (BNA)
>Block group
>Block
A block group is a cluster of blocks having the same first digit of
the 3-digit identifying numbers in a census tract/BNA. In the data
tabulations, a geographic block group may be split. Therefore,
SOME OF THE BLOCK GROUPS CONTAIN MORE THAN ONE POPULATION POINT.
Block groups do not cross census tract or block numbering area
boundaries.
Census tracts are small, relatively permanent statistical
subdivisions of a county. They are identified by a four-digit
basic number and may have a two-digit suffix. Census tract numbers
range from 0001 to 9499.9 and are unique within a county. The
suffix .99 identifies a census tract that was populated entirely by
persons aboard one or more ships.
Block numbering areas (BNAs) are small statistical subdivisions of
a county for areas where census tracts are not established. They
are identified by a four-digit basic number and may have a
two-digit suffix. BNA numbers range from 9501 to 9980.99 and are
unique within a county. The suffix .99 identifies a census tract
that was populated entirely by persons aboard one or more ships.
Suffixes in the range of .80 through .98 usually identify census
tracts or BNAs that were revised or created during the 1990 census.
Some of these revisions may have resulted in census tracts or BNAs
that have extremely small land area and may have little or no
population or housing.
Census tracts and BNAs do not cross county boundaries.
AREA_LAND is the land area of the Census block group that the point
represents in square kilometers. Area was calculated from the
boundaries in the TIGER/Line files.
AREA_WATER is the water area of the Census block group that the
point represents in square kilometers. Area was calculated from
the boundaries in the TIGER/Line files.
POP90 is total population.
HU90 is total housing units. A housing unit is a house, apartment,
mobile home or trailer, a group of rooms, or a single room occupied
as separate living quarters. Both occupied and vacant housing
units are included.
The location of each point represents the approximate geographic
center of the block group.
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+uspop90
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
zipped
1
http://water.usgs.gov/GIS/dsdl/uspop90.e00.gz
SDTS
Full coverage
zipped
1
http://water.usgs.gov/GIS/dsdl/uspop90.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+uspop90
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998