11 Oct
2010
11 Oct
'10
9:19 a.m.
Pete,
The information that I have been receiving through the Texas Transportation Institute has
been that the 2005-2009 ACS data will not be good at the block group level, at least not
for places like Abilene, TX (pop. appx. 120,000). If you have been getting different
information, I would very much like to know, as it is very important due to the timetable
for our current travel demand model update.
Robert R. Allen, AICP
Abilene MPO Transportation Planning Director
400 Oak Street, Suite 102, Abilene, TX 79602
Office (325) 676-6243
Fax (325) 676-6398
Cell (325) 513-4615
________________________________
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of
Pete Swensson
Sent: Friday, October 08, 2010 3:36 PM
To: ctpp-news(a)chrispy.net
Subject: RE: [CTPP] RE: TAZ delineation for CTPP (2006-2010) tabulation SCHEDULE
I'll just jump in. I am on the CTPP Oversight Committee that prepared the
"Business Rules" for delineating the TAZs for which Census will report the
data.
Census has been collecting journey to work data through the American Community Survey
nationwide since 2006 that will go into the CTPP 2006-2010 tabulation. They need all of
us FIRST to delineate our TAZs for them to create the tabulation. So you won't be
able to wait to see the data first in order to determine how best to delineate your TAZs.
Sometime around December of this year, the 2005-2009 5-year dataset will come out,
providing data down to the block group level (2000 census block group geography), and you
may find that useful in determining how you want to delineate your TAZs. It won't be
exactly what you are looking for geographically, the standard tables will not be as
specifically tailored to transportation modelers, and the data won't be benchmarked to
this year's decennial census like the 2006-2010 dataset will. But it may give you
some useful data.
Pete Swensson, Senior Planner
Thurston Regional Planning Council
2424 Heritage Ct. SW
Olympia, WA 98502
(360) 741-2530 (direct line)
(360) 956-7575 (main desk)
(360) 956-7815 (fax)
swenssp@trpc.org<mailto:swenssp@trpc.org>
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From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of
Curt Hutchings
Sent: Friday, October 08, 2010 12:20 PM
To: ctpp-news(a)chrispy.net
Subject: [CTPP] RE: TAZ delineation for CTPP (2006-2010) tabulation SCHEDULE
Elaine,
Please excuse my ignorance. I have had questions about how the Census Dept. would collect
TAZ data for the Census. I have been waiting for information like you have provided
below. Can you give me any additional information? We are in the process of modifying
our TAZ structure now and want, If possible to use the new information in this count. Any
thoughts?
Thanks,
[cid:056131314@11102010-208B]
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of
Elaine.Murakami(a)dot.gov
Sent: Wednesday, October 06, 2010 10:32 AM
To: ctpp-news(a)chrispy.net
Subject: [CTPP] TAZ delineation for CTPP (2006-2010) tabulation SCHEDULE
At our monthly CTPP Technical meeting last week, April Avnayim of the Census Bureau
Geography Division, gave us an update on the TAZ delineation software schedule.
November 2010: agencies verify contact names by reviewing file at Cambridge Systematics
ftp site, and report any changes to Liang Long.
December 2010: final delivery of software by Caliper to CB
February 2011: web-based training coordinated with FHWA
January thru March 2011: delivery of software and Census 2010 data and geographic files
on a rolling basis.
Each state will get 3 - 4 months to delineate their TAZ and TADs and return the files to
the Census Bureau.
July 2011: all files MUST be returned to CB Geography Division.
Please note: TAZs for CTPP tabulation do not necessarily match the TAZs for your travel
demand model. Because the ACS sample is small, some agencies are planning to make the
TAZs for CTPP LARGER than their model TAZs, e.g. combining their model TAZs together.
Also, TAZs for CTPP are census block equivalencies. You will NOT be able to modify the
TIGER segments (which was possible in the CTPP2000). Finally, agencies are NOT required
to define TAZs or TADs. If you do not define TAZs, then census tracts will be used as the
default geography for CTPP (2006-2010) tabulation. However, even if you do not define
TAZs, we recommend that you create TADs (population threshold of 20,000) by combining
census tracts together.
The TAZ business rules are posted on the FHWA webpage:
http://www.fhwa.dot.gov/ctpp/tazddbrules.htm<http://console.mxlogic.com/…
