As Ed well knows, no future CTPP 3 year tabulation is planned, the future of the CTPP
program is uncertain itself.
The census bureau is not accepting TADs of less than 20,000 so the rest of the questions
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From: "Ed Christopher" <edc(a)berwyned.com>
Date: Tue, 28 Jun 2011 14:42:16
Subject: RE: [CTPP] RE: TAZ delineation update
Does this mean that there will be another 3-year CTPP special tabulation?
If so, when is due to come out?
What if I have TADS smaller than 20,000? Will I get the 5-year CTPP data
tabulated for my smaller than 20K TADs?
Or put another way, can I delineate TADs that have less than 20,000
residents and still get 5-year CTPP tables reported for them?
The reasoning behind TADs at 20,000 is so there will
be a full layer
coverage of three year ACS data. The ACS is released at specific
geographies depending on how many years are being released. For 3 - year
ACS data, the population threshold for smallest geography is 20,000. If
you delineate your TADs smaller than 20,000, data will not be reported for
them in three year data sets and we will have the "swiss cheese" coverage
we currently have.
From: ctpp-news-bounces(a)chrispy.net on behalf of John M. Sharp - ACOG
Sent: Tue 6/28/2011 1:37 PM
Subject: [CTPP] RE: TAZ delineation update
Being a little slow on the TAZs.
However, a question on the TADs. What do we lose (data wise) if we have
some TADs that total only 15,000, rather than the 20,000?
From: ctpp-news-bounces(a)chrispy.net [mailto:firstname.lastname@example.org]
On Behalf Of Elaine.Murakami(a)dot.gov
Sent: Thursday, June 16, 2011 2:49 PM
Subject: [CTPP] TAZ delineation update
Over 100 agencies have ALREADY submitted their files to the Census Bureau
Geography Division, with at least 10 agencies submitting files today (June
The CB GEO staff have found that the TAZ files look pretty good, and
although there are some TAZs that look "too small" these are often in
areas with parks or water areas. They also said that the TADs look VERY
good, with very good adherence to the 20,000 population threshold.
Thank you to everyone! I know the rest of you who are participating in
the program are working very hard to complete this task. Getting the TAZ
and TAD into Census TIGER is one step for the CTPP 5-year tabulation.
This tabulation will use ACS records from 2006-2010. AASHTO is expected
to submit the 5-year table list to the Census Bureau's Disclosure Review
Board this July.
Re: TAZ, don't call me :), please call the Census Bureau Geography
Division at 301-763-1099. Email:
FHWA Office of Planning
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FHWA Resource Center Planning Team
4749 Lincoln Mall Drive, Suite 600
Matteson, IL 60443
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