shrug-l: Mapping ACS Data

Adam Carnow acarnow at
Fri Nov 11 09:44:10 EST 2011

FYI - from a NC listserv:


Hi folks!


As you know the American Community Survey (ACS) has replaced the Census
2000 long form that reported socioeconomic characteristics of the
population such as income, poverty, educational attainment, employment,
occupation, commuting, etc..  ACS samples monthly and reports data
annually as either single year estimates for areas of 65,000 or more,
3-year estimates for areas of 20,000 or more, and 5-year estimates to
the census tract and block group level.  The ACS estimates are published
with margins of error at 90% degree of confidence.


These margins of error present problems when creating maps of the ACS


George Mason University's Dept. of Geography and GeoInformation Science
has developed a mapping extension that makes it possible to incorporate
information on statistical uncertainty into maps featuring ACS
estimates. Currently, instructions are provided in the extension's
documentation for using the mapping extension with AFF 1; In the future,
the extension will include instructions for AFF II.

The extension automates many tasks normally required to use ArcGIS for
this purpose.


The extension works with versions 9.3 and 10.0 of ArcGIS and is
available for downloading free of charge at the following link:


Bob Coats

(919) 807-4781


Governor's Census Liaison

North Carolina State Data Center

Strategic Management

North Carolina Office of State Budget and Management 

20320 Mail Service Center

Raleigh, NC 27699-0320


NOTE: Email correspondence to and from this address may be subject to
the North Carolina Public Records Law (GS 132) and may be disclosed to
third parties by an authorized state official. 


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