New subject: Miscellaneous info re: CTPP-- Update from NYSDOT

6 Oct 2010

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%20Trans
portation%20Planning%20Package%202000%20CD-ROM%20Version%20-%20with%20Be
yond%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 