The files for the 2008-2010 ACS 3-year estimates are similar to last year's publications (the 2009 ACS 1-, 3-, and 5-year estimates) with the following exceptions. These changes were established starting with the 2010 ACS 3-year release:
- Geography Files Offered in Comma Delimited Format
The geography files are offered in two formats: position based and comma delimited. In previous years, the geography files were only offered in position based format.
- SummaryFileXLS.zip Renamed to SummaryFileTemplates.zip
The zipped "SummaryFileXLS" folder was renamed to "SummaryFileTemplates" to more accurately reflect its contents: templates (or column headers) for each of the sequence files. This folder is located in the "User Tools" folder on the Summary File site: http://www2.census.gov/acs2010_3yr/summaryfile/UserTools/.
- SummaryFileTemplates.zip Includes a Template for the Geography File
A template for the geography file was added in the "SummaryFileTemplates" zipped folder due to popular demand. For more information, visit Chapter 2.4.
- Missing Value Has Been Changed From Dot to Empty Cell
Previously, a dot "." was used to indicate that an estimate was unavailable due to coefficient of variation (CV) filtering or Disclosure Review Board (DRB) restrictions. For the 2010 ACS Summary Files, the dot is being replaced by an empty cell. For more information, visit Appendix C.3.
- Instructions Added on How to Join the Summary File to TIGER/Line Shapefiles
The Summary File Technical Documentation now includes instructions on how to join the ACSSF to TIGER/Line Shapefiles. For more information, visit Chapter 2.6.