Nathan Erlbaum of NYSDOT  sent me an email yesterday with notice that some of the files (Item 2 in my email of Oct 6) have been updated, and if you downloaded file between Oct 6 and 12, you should download the corrected files.

A number of changes have been made to the page and referenced files noted below on the following link on our website.

https://www.nysdot.gov/divisions/policy-and-strategy/darb/dai-unit/ttss/cttp_acs

From: Murakami, Elaine (FHWA)
Sent: Wednesday, October 06, 2010 9:21 AM
To: ctpp-news@chrispy.net
Subject: Miscellaneous info re: CTPP

1. Jane Traynham of the Maryland State Data Center shared their work using the new CTPP 3-year data.  Please see the bar charts that show changes in county-to-county commute flows.

http://planning.maryland.gov/msdc/S1_Census.shtml

2.  Nathan Erlbaum of the New York State DOT has created tables that show the county-to-county flows, using CTPP2000, LEHD 2006, and CTPP 2006-2008.  https://www.nysdot.gov/divisions/policy-and-strategy/darb/dai-unit/ttss/cttp_acs

Because of the very large population in New York City, the 5 boroughs are treated as counties. If you look at the “internal” county flows for Kings, Queens, and New York, you will see major differences between the LEHD and the Census 2000 and CTPP 2006-2008 numbers, and if you ignore the numbers and use % distributions, you will see large differences as well.  Nathan’s web page lists many of the reasons for these differences, including differences in the worker population, survey vs. administrative records, etc.

3.  The CTPP2000 in .ivt format (including the Beyond 20/20 software) are now available in the BTS TranStats as downloadable files.  http://www.transtats.bts.gov/Tables.asp?DB_ID=645&DB_Name=Census%20Transportation%20Planning%20Package%202000%20CD-ROM%20Version%20-%20with%20Beyond%2020/20%20Access%20Tool&DB_Short_Name=CTPP%202000 Previously these were available by ordering CD copies through the BTS Bookstore.  We hope this web-based system makes it easier for everyone. 

The CTPP 3-year (2006-2008) full set of more than 300 tables will be available using web-based software prepared by Beyond 20/20 under contract to AASHTO’s CTPP program.   The software will be in beta-test this month (October). 

4. ACS Workshop at TRB Annual Meeting, Sunday, January 23, 2011.  If you are planning to attend TRB in January, please remember to arrive in time to attend this data workshop on Sunday.  The organizers have requested the morning session (8:30 a.m. until noon).  Topics will include 2010 Census, ACS standard tabs and Public Use Microdata Sample, CTPP (3-year and 5-year tabulations), and TAZ delineation software.

5. And,  just in case you lost the link to the ftp site with the County-to-County and Place-to-Place flows from the CTPP 3-year tabulation, here it is:  ftp://ftp.camsys.com/temp/outgoing/CTPP/New%20CTPP%20ACS/

Please share your work using the new CTPP (2006-2008).

I will be sending another post to the CTPP listserv shortly that addresses TAZ delineation only.

Elaine Murakami

FHWA Office of Planning

206-220-4460