20 Feb
2013
20 Feb
'13
9:24 a.m.
Thanks Penelope. Hope all is well.
Hi to Rachel.
Steve
Steven Farber, Ph.D
Assistant Professor
Department of Geography
University of Utah
----- Reply message -----
From: "Weinberger, Penelope" <pweinberger(a)aashto.org>
To: "ctpp-news(a)chrispy.net" <ctpp-news(a)chrispy.net>
Subject: [CTPP] TAZs and rural areas
Date: Wed, Feb 20, 2013 8:12 am
Welcome,
We are expecting the small area geography to be available for flows for the following
geography pairs:
Tract Tract
TAD TAD
TAZ (Base) TAZ (Base)
TAD TAZ (Base)
TAZ (Base) TAD
State-Place TAZ (Base)
TAZ (Base) Place
So yes, is the answer. The data should be less spotty than the 2000 data for several
reasons, one is that the matrix is for all geos of the given level (i.e., you can ask for
a flow from a tract in CA to one in KS - and if there is sufficient data you will get it),
and another reason is that there is a methodology to privacy protect the data so it can be
produced without so much suppression. Some of the data will be perturbated - it will be
abundantly clear which, and the totals will not match for data of a similar area, but
there will be data.
The data is expected in Mid-2013
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of
Steven Farber
Sent: Tuesday, February 19, 2013 5:20 PM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] TAZs and rural areas
First time poster here.
Will Part 3 of the 5-year CTPP be available at the Census tract level of geography for all
MPO's? Or will the data only be available at the TAZ level specified by each MPO. I am
doing comparative research across MPO's and will need to create OD matrices at the CT
level for many different regions. I was able to do this using CTPP 2000, but it's
time for an update. On that note, will Part 3 coverage be spotty? Using the CTPP 2000
data, my impression was that I was able to create matrices without a lot of
"missing" or suppressed values. Can I expect the same after the migration to ACS
5 year data?
Thanks for your response.
Steve
Steven Farber, PhD
Assistant Professor
Department of Geography
University of Utah
http://stevenfarber.wordpress.com
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of
liang.long(a)dot.gov
Sent: Tuesday, February 19, 2013 2:51 PM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] TAZs and rural areas
Hi, Jason
For the purpose of CTPP 2006-2010 data, CTPP program asked MPOs and State DOTs delineated
TAZs for their responding areas. For counties that were not claimed by MPOs and State
DOTs, Census Tracts are the default geographies. This process was completed in the year
of 2011. The Census Bureau has released TAZ boundaries without data in their ftp site:
ftp://ftp2.census.gov/geo/tiger/TIGER2010/TAZ/2010/
You can obtain more information of TAZ/TAD delineation on this AASHTO website.
http://ctpp.transportation.org/Pages/taz.aspx
Liang
________________________________________
From: ctpp-news-bounces(a)chrispy.net [ctpp-news-bounces(a)chrispy.net] on behalf of Jason
Gillow [jason.gillow(a)ovrdc.org]
Sent: Tuesday, February 19, 2013 4:13 PM
To: ctpp-news(a)chrispy.net
Subject: [CTPP] TAZs and rural areas
Hello
I am new to idea of TAZs (traffic analysis zones).
I was wondering if there has been any release of a new TAZs boundaries for the country?
How are TAZs delineated for rural areas? (Non-MPO area) What is the best source in
understanding TAZs and in relation to census data?
Thank you
Jason
Jason Gillow
Research/Planning Specialist II
Ohio Valley Regional Development Commission P.O. Box 149 Waverly, OH 45690 Phone
740-947-2853 or 800-223-7491 (In Ohio) and Fax 740-947-3468
Website: www.ovrdc.org<http://www.ovrdc.org>
E-mail- jgillow(a)ovrdc.org
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