Mark et al:
I may have responded hastily. Elaine Murakami has pointed out correctly that what Census most needs is a correspondence table that tells them which Census blocks to assign to which TAZs (i.e., a “Block Equivalency File” or BEF). The BEFs for the TAZ and TAD plans are the outputs of the TAZ delineation software that go to Census. So maybe you can send in a BEF directly generated from your GIS (look at all these acronyms!).
In reviewing the draft software, I see that there is an option to import your own BEFs generated from your own GIS in a choice of formats (as a text file, or dbf, etc.,) and then to use the TAZ software to check it for overlapping TAZs (a block gets counted in more than one TAZ), gaps where a block wasn’t included in any TAZ, and various other tests. So even if you do most of your analysis outside the TAZ delineation software, there would still be some value in using it to do some quality control checks on the work.
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)
This e-mail and any attachments are for the use of the addressed individual. If you have received this e-mail in error, please notify our systems manager. TRPC has taken responsible precautions to ensure no viruses are present in this e-mail, however we do not accept responsibility for loss or damage arising from the use of this e-mail or attachments.
From: ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Pete Swensson
Sent: Wednesday, January 19, 2011 4:01 PM
To: ctpp-news@chrispy.net
Subject: RE: [CTPP] RE: TAZ software training vs. not using the TAZ software
Mark:
I am on the AASHTO CTPP committee, and I can answer part of your question: You can create your own shape files, you can import them into the TAZ delineation software for viewing, BUT you cannot submit them directly to Census as your desired TAZ delineation. Census needs the delineations from all the MPOs and DOTs from across the land in a single uniform file format, which is the format of the output of the TAZ software.
The software will allow you to import your shape files so that you can construct the TAZs with the shapes from your other software as a background layer.
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)
This e-mail and any attachments are for the use of the addressed individual. If you have received this e-mail in error, please notify our systems manager. TRPC has taken responsible precautions to ensure no viruses are present in this e-mail, however we do not accept responsibility for loss or damage arising from the use of this e-mail or attachments.
From: ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Flinner, Mark (DOT)
Sent: Wednesday, January 19, 2011 2:46 PM
To: ctpp-news@chrispy.net
Cc: jonathan ehrlich; Tom Faella; mark.filipi@metc.state.mn.us
Subject: [CTPP] RE: TAZ software training vs. not using the TAZ software
Is there anything to prevent an MPO from creating their own shape files for Census TAZ or Census TAD boundary/ Block Equivalencies assuming they have already obtained 2010 TIGER boundary sets?
Also, we am planning a Census TAZ delineation workshop on February 7th to discuss issues associated with nesting model TAZs within Census TAZs given the relatively low populations of most of our MPO model TAZs. I had hoped to acquaint people with the software environment prior to the training sessions at the end of the month but understand that we are not a testing state. I also expect a discussion of the complexities of obtaining CTPP special tabulation data then needing to reallocate the data to model TAZ geographies. Is there anything you can share with us to assist in these areas? I have also received a question of what other uses (besides the one-time use of obtaining CTPP data) the census TAZ and TAD geographies have beyond the census year. LEHD On the Map comes to mind… other uses?
Thank you.
From: ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Elaine.Murakami@dot.gov
Sent: Thursday, January 13, 2011 5:25 PM
To: ctpp-news@chrispy.net
Subject: [CTPP] TAZ software training: WEB ONLY scheduled for Friday, Feb 25 and Monday, Feb 28
As you know, TAZ delineation by State DOTs and MPOs will occur very soon, with software distribution in March/early April and files returned to the CB by mid-July. The software is being tested by volunteer State DOTs and MPOs starting from Friday, Jan 14 thru Feb 2. Thank you to all the volunteers! We do not need any additional software testers.
We have two web training events scheduled. REGISTRATION IS REQUIRED. Please make sure that you capture the full http:// address, in case the listserv breaks it up. You need the address including webconfid=22433, or webconfid=21975
I have reserved 300 spaces for each day, so there should be enough room for everyone. If you are unavailable on those days, the sessions will be recorded and available for later viewing. The same training will occur on each day, so please sign up for only one.
The web meeting software has been upgraded, therefore, the email with the confirmation of your registration will have a link to check the functionality on your computer.
Friday, 2/25/2011, from 10 a.m. – noon EASTERN:
Registration URL: https://www.nhi.fhwa.dot.gov/resources/webconference/web_conf_learner_reg.aspx?webconfid=22433
Monday, 2/28/2011, from 2 - 4 p.m. EASTERN:
Registration URL: https://www.nhi.fhwa.dot.gov/resources/webconference/web_conf_learner_reg.aspx?webconfid=21975
Question: why is the time to do this only 3 months?
Answer: For the TAZ and TAD delineation, it is important to be able to use the TIGER files with the 2010 geography and 2010 population counts. The 2010 population counts will be released to the public on a flow basis starting in March 2011, so we have to wait until these data are available to begin TAZ and TAD delineation. If the 5-year CTPP using 2006-2010 ACS records will be tabulated for TAZs and TADs, the TAZ and TAD delineations need to be completed quickly and returned to the CB Geography Division (GEO) 3 months after the agencies receive their files (no later than July 2011).
This provides GEO with sufficient time to QC the submissions, produce the necessary files so that ACS records will get TAZ/TAD identifiers, and create TIGER/Line shapefiles for TAZ/TAD geography. If the TAZs and TADs
are not delineated within this time frame, the CTPP tabulation could be delayed for another year, that is, Fall 2013.
Question: are there strict thresholds on either residential population or workplace population?
Answer: No. The software will give a warning message, but will still allow you to define TAZs below the recommended “threshold.” (The FAQ will include more discussion about this topic.)
We are working on an FAQ document on TAZs and will post it on the AASHTO CTPP page.
http://ctpp.transportation.org/Pages/taz.aspx
Elaine Murakami
FHWA Office of Planning
206-220-4460