|The 1995 TIGER (Topologically
Integrated Geographic Encoding and Referencing
system) Data is available from ESRI
(Environmental Systems Research Institute,
Inc). Using this data offers several advantages to educators.
Unfortunately, much of this data has
been aggregated. What does this mean? Let's say that you are opening data
on the location of cities. Rather than representing each city with a separate
color, all cities are represented by shapes of the same color. In other
words, the separate cities have been combined (aggregated) to create city
The data can be downloaded free.
Data can be downloaded for every county
in the United States.
The data is already formatted for use
A wide variety of local data is available.
This may be useful in some contexts.
However, it can also be useful to have each city identified by name and
a unique color. To do this, you must disaggregate the data. This
tutorial describes the process of disaggregating the 1995 Census TIGER
Data available from ESRI
For additional information on the
Census TIGER Data, see the Census
at the ESRI Web Site or the U.S.
Census TIGER Web Site.