Of the various types of thematic maps,
choropleth maps are the most common and
easily interpreted. With a choropleth map
one uses a sequence of shades, colors or
patterns to assign values/classes using
predefined areal units (politically-defined
area or administrative units--census areas
or zip codes). Here we are using dot maps,
as they provide an easily understood pattern
of relative AIDS density.
In this series
of county-based dot-density maps, the data
used are estimated AIDS cases by county, for
the 50 US states, Washington D.C. and Puerto
Rico, cumulative through 2007. The mapped
data excludes cases where the county of
residence at AIDS diagnosis is unknown (but
these cases are accounted for in the title
of each map where the cumulative number is
provided). The dot size and value remain
constant through time; each dot represents
50 cases of AIDS by county. In other words,
if by 2005 a particular county hasn’t
reported more than 49 cumulative cases of
AIDS, then that county would not have a dot
associated with it -- it doesn’t mean that
county doesn’t have any cases of AIDS, only
that it doesn’t have 50 or more.
Additionally, if a county has between 50 and
99 cases of AIDS, it receives 1 dot. In
several areas the dots begin to coalesce as
time passes. Assigning one dot to every 100
cases was considered, but left many areas of
the US erroneously under-represented.
Finally, the dots are randomly placed inside
the counties.
Data source: HIV Incidence and Case
Surveillance Branch, Division of HIV/AIDS
Prevention, Centers for Disease Control and
Prevention. Data have been adjusted for
reporting delays. Data are presented for
AIDS cases reported to CDC through June
2007. All data are provisional.
Instructions for downloading and using
HIV/AIDS surveillance slides.
Download the
complete slide set:
While the content is in the public domain and
no copyright restriction applies,
we do ask that users preserve the slides in
their current format and cite CDC as the
source.
Slide 1
Estimated AIDS Cases in the United
States and Puerto Rico Cumulative
through 1983 N = 4,793
PDF
File
or
PPT
File |
Slide 2
Estimated AIDS Cases in the United
States and Puerto Rico Cumulative
through 1985 N = 23,141
PDF
File
or
PPT
File |
Slide 3
Estimated AIDS Cases in the United States and Puerto Rico Cumulative through 1987 N =
71,189
PDF
File
or
PPT
File |
Slide 4
Estimated AIDS Cases in the United
States and Puerto Rico Cumulative
through 1989 N = 149,528
PDF
File
or
PPT
File |
Slide 5
Estimated AIDS Cases in the United States and Puerto Rico Cumulative through 1991 N =
257,594
PDF
File
or
PPT
File |
Slide 6
Estimated AIDS Cases in the United
States and Puerto Rico Cumulative
through 1993 N = 413,074
PDF
File
or
PPT
File |
Slide 7
Estimated AIDS Cases in the United States and Puerto Rico Cumulative through 1995 N =
552,002 PDF
File
or
PPT
File |
Slide 8
Estimated AIDS Cases in the United
States and Puerto Rico Cumulative
through 1997 N = 660,763
PDF
File
or
PPT
File |
Slide 9
Estimated AIDS Cases in the United States and Puerto Rico Cumulative through 1999 N =
742,557
PDF
File
or
PPT
File |
Slide 10
Estimated AIDS Cases in the United
States and Puerto Rico Cumulative
through 2001 N = 821,566
PDF File
or
PPT
File |
Slide 11
Estimated AIDS Cases in the United States and Puerto Rico Cumulative through
2003 N = 900,883
PDF
File
or
PPT
File |
Slide 12
Estimated AIDS Cases in the United States and Puerto Rico Cumulative through
2005 N = 976,474
PDF
File
or
PPT
File |
Slide 13
Estimated AIDS Cases in the United
States and Puerto Rico Cumulative
through 2007 N = 1,049,714
PDF
File
or
PPT
File |
|