CTPP August 2009

ctpp@listserv.transportation.org

22 participants
19 discussions

by Sabula

I am passing on a question from one of our strategic planners. "Where can I find data on Mode of transportation for work trips by county, travel time to work by county, number of commuters by community/city, and carpool commuter activity by community/city?" If anyone knows where to find this information (state of Utah), please let me know. Thank you! Julianne Sabula Utah Transit Authority Engineering and Construction Planner II 669 West 200 South Salt Lake City, UT 84101 w. (801) 237-1973 c. (801) 867-5203 jsabula(a)rideuta.com

15 years, 3 months

Re: [CTPP] Documentation on using LEHD OnTheMap files

by Mark Flinner

Thanks Elaine. I haven't actually used OnTheMap other than to explore the web application and try some downloads but I thought that I would forward the caveats that I have run across. Re: Version 3 OTM...(see: http://www.vrdc.cornell.edu/onthemap/data/v3/notes-otm-v3.0.pdf ) V3 Caveats: •QWI numbers are drawn from QWI release R2008Q2. Stable jobs and statistics related to 'stable jobs' have a bug which has been fixed in QWI release R2008Q4. An update to the data is expected later this year. Consult the LEHD site for more details. •Current QWI numbers are considered experimental. Since they are computed using the same confidentiality protection technology as the general QWI numbers, but using much finer geographic cells, there are more suppressions (more smaller numbers to protect). Users should be aware that when aggregating numbers to levels that are comparable to the general QWI data, the numbers they generate will be systematically lower. •Only one implicate has been released at this point. Future updates should be counted (and used) as additional implicates. Additional implicates may be released in the future as well. •WAC, OD, and QWI files are only available for states participating in the LEHD program. RAC files are available for all states, even those not actively participating in the LEHD program, but coverage is limited. For example, a worker of a NJ company (NJ participates in LEHD) may live in NY (which not yet been integrated). Thus, a residence area for this and other workers is defined, and available here for download. However, the residence area information will NOT include information on workers of NY companies, since that information was not available at the time that OnTheMap v3.0 was created. (This applies for v3.0 to: CT, DC, MA, NY, NY, OH, PR, VI). These RAC files can be accessed through the links in the OD AUX files of states where these workers are tabulated. It appears that only one implicate has been released in Version 3. Version 2 documentation from section 1.2.3 at http://www.vrdc.cornell.edu/onthemap/doc/otm_public_master.pdf indicates that three implicates were available and adds the following warning: This version of the data provides 3 implicates (independent draws in the synthesizing algorithm) for the OD matrix and the Residence Area Characteristics (RAC) files. This is reflected in the filenames, see Sections 1.4.3 and 1.4.4. For further information on how to properly analyze multiply synthesized or imputed datasets, see Raghunathan et al. (2003); Reiter (2004b) and Reiter (2004a), or consult Sessions 8a and 8b of the online INFO 747 class at Cornell University's CISER at http://vrdc.ciser.cornell.edu/info747/. A note of warning is in order, though: It is statistically incorrect to use the average of the 3 implicates unless the aggregator function is strictly linear. Adding geographic areas is linear, and forming ratios from two linearly aggregated quantities (earnings over employment, for example) can be done correctly as long as the numerator and the denominator are averaged separately.

15 years, 11 months

[CTPP] Documentation on using LEHD OnTheMap files

by Elaine.Murakami＠dot.gov

We (the royal "we") are interested in personal travel patterns, for a variety of transportation planning applications. The CTPP program will provide home-to-work origin-destination tables using multiple years of surveys from the American Community Survey. But, other data sources should be examined for their potential to augment the CTPP, for small area origin-destination matrices. For example, many of you are aware of my interest in using multi-day GPS. Each data source, including ACS and the CTPP, has its own benefits and limitations. One of the datasets of interest is the LEHD OntheMap "home-to-work" flows. We would like to encourage more analysis and evaluation of the LEHD OnTheMap data. While the LEHD OnTheMap interface is a user-friendly web-based software http://lehd.did.census.gov/led/ , we believe that transportation planners will be more interested in the potential of the synthetic block data records (10 implicates are created in the data synthesis process) to examine the origin/destination flow results. These data are available for download on the Cornell University Virtual Data Center. I asked Laura McWethy at Cambridge Systematics to prepare some documentation on the files, to make it easier for others to examine this data. It is attached. Caveats: The files are large since they represent block-to-block pairs. The data are synthetic. This is the first synthetic data product approved by the Census Bureau's Disclosure Review Board. Data synthesis is used to protect individual confidentiality. The universe of workers (workers covered by unemployment insurance) differs from "all workers" You should take the time to understand the data sources and synthetic data processes used to generate these results. We are interested in your tests of the LEHD OnTheMap block level data. I hope that Nathan Erlbaum and Aaron Westcott of New York State DOT will share the results of their work on county-to-county flows. Introductory material on LEHD OnTheMap is available through a recorded presentation from the TRB Planning Applications conference in Houston http://teachamerica.com/APP09/ (go to the Sunday session and look for DATA), and also at the LEHD OnTheMap home page http://lehd.did.census.gov/led/ . Elaine Murakami FHWA Office of Planning (Wash DC) 206-220-4460 (in Seattle)

15 years, 11 months

[CTPP] automated response

by Douglas Bell

I will be out of the office until Monday, August 31. I will reply to your message when I return.

15 years, 11 months

[CTPP] Tools of the Trade 2010 Call for Abstracts

by Everett

Hello all (Please forgive me if you have already received this information from another source.) Attached is a Call for Abstracts for the next Tools of the Trade Conference. The Conference focuses on transportation planning topics and tools for small and medium-sized areas. The conference will be held in September 2010, in historic Williamsburg, VA. Please review the topics listed in the Call and consider submitting an abstract about work conducted in your area or by your agency that would be of interest to others across the country. In addition, please forward this Call to anyone that you think might be interested in submitting an abstract or in attending the conference. Our committee website has additional information and can be accessed at the following link: http://www.trbtoolsofthetrade.org/conference.html. Jerry Everett Research Director Center for Transportation Research Suite 309 Conference Building 600 Henley Street University of Tennessee Knoxville, TN 37996 (865) 974-8275

15 years, 11 months

[CTPP] Alison K Fields/POP/HQ/BOC is out of the office.

by alison.k.fields＠census.gov

I will be out of the office starting 08/07/2009 and will not return until 08/24/2009. If you need immediate assistance please see one of the following people during my absence. August 7 Melissa Chiu 7H484F 3-2421. August 10 -August 14 Kin Koerber 7H486E 3-7620 August 17-August 21 Melissa Chiu 7H484F 3-2421 For all CTPP-related matters please see Melissa Chiu.

15 years, 11 months

[CTPP] RE: ctpp-news Digest, Vol 66, Issue 7

by Patricia Tice

The full white paper on TAZ guidelines from the FDOT systems planning office is here: http://www.fsutmsonline.net/images/uploads/reports/FDOT_TAZ_White_Paper.pdf A power point presentation based on this is here: http://www.google.com/url?sa=t&source=web&ct=res&cd=1&url=http%3A%2F%2Fwww.… Patricia C. Tice, PE, AICP, LEED AP Glatting Jackson Kercher Anglin, Inc.

15 years, 11 months

[CTPP] AUTO: Harvey Michaels (returning 08/17/2009)

by Michaels.Harvey＠epamail.epa.gov

I am out of the office until 08/17/2009. I will respond to your message when I return. Note: This is an automated response to your message "RE: [CTPP] TAZ Development" sent on 8/11/2009 9:28:39 AM. This is the only notification you will receive while this person is away.

15 years, 11 months

[CTPP] TAZ Development

by Paddock

I must admit that, of late, I have gotten lost in the woods while trying to see all the trees. During these past months I have been engaged in developing a new TAZ system for the Minneapolis - St. Paul MPO area that will both serve the needs of travel demand modeling here at the Metropolitan Council AND provide us with the information we want from a 2010 CTPP-like product. This new TAZ system is substantially more refined than those of the past and should result in reasonable travel loadings on our arterial roadway network. However, certain issues have been raising their knobby heads regarding zone size that probably will clash with Census Disclosure Board rules. Does anyone have a reasonable idea as to what minimum population or household levels a TAZ will need to attain in order to circumvent large numbers of "blank" cells? I suspect that there is not an easy, uncomplicated answer but would like to hear one nonetheless. Bob Paddock Transportation Planning Metropolitan Council Bob.paddock(a)metc.state.mn.us 651 / 602-1340

15 years, 11 months

[CTPP] Re: ctpp-news Digest, Vol 66, Issue 5

by Jorge Argote

I will be on vacation from August 10 through Sept 3, 2009. If you need immediate help please contact: Tanya Rodriguez at 212-383-2516 (trodriguez(a)dot.state.ny.us) Munnesh Patel at 212-383-2528 (mpatel(a)dot.state.ny.us) Jorge Argote, P.E. Manager, Travel Surveys Unit Technical Group NY Metropolitan Transportation Council 199 Water Street, New York, NY 10038 Tel: (212) 383-2527; Fax: (212) 383-2418 jargote(a)dot.state.ny.us

15 years, 12 months

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CTPP August 2009