CTPP October 2007

ctpp@listserv.transportation.org

6 participants
6 discussions

Re: [CTPP] 2006 ACS Data

by Chuck Purvis

Paul: The simple answer is no. No data from the ACS is currently available at the block group or block level. You will need to use Census 2000 (SF1, PL 94-171) to get any kind of data at the block level. For the block group level, you can use almost any Census 2000 product (SF1, PL 94-171, SF3, CTPP-Part 1). The ACS will never, ever produce or publish data at the block level. The ACS is a sample survey, and the Census Bureau will never release sample data at the block level of geography. Block *group* data could or should be published by the Census Bureau based on five-years of ACS data (2005-2009) as early as Fall 2010(?). Then, the Census 2010 data will start kicking in with the PL94-171 data released by the spring of 2011. For aggregate travel model validation, on the other hand, the mid-decade ACS data can be very, very useful. Right now, you can get validation tables such as households by household size; households by number of workers in the household; and households by number of vehicles available in the household. I think these are quite useful for your "demographic model" validation. Also, the journey-to-work data is being published, so that you can produce "observed home-based work trip ends by means of transportation" by area-of-residence as well as area-of-work. Depending on the size of your region, you may be stuck with county (as long as the county's total population is > 65,000); or you may be able to use the data published at the Public Use Microdata Area (PUMA) level. These are the Census 2000 PUMAs, and are "standard census geographic areas" that were defined by the state data center network, and are all 100,000+ in total population. If you're working with smaller counties (20,000-65,000 population) then you'll have to wait for the 3-year ACS data products, based on the 2005-2007 period, which will be released as early as Fall 2008. cheers, Chuck Purvis ************************************************************** Charles L. Purvis, AICP Principal Transportation Planner/Analyst Metropolitan Transportation Commission 101 Eighth Street Oakland, CA 94607-4700 (510) 817-5755 (office) (510) 817-7848 (fax) cpurvis(a)mtc.ca.gov (e-mail) www: http://www.mtc.ca.gov/ ************************************************************** >>> "Flavien, Paul H" <PHFlavien(a)pbsj.com> 10/18/07 12:27 PM >>> Hi all, We are about to undertake a model validation. As part of the validation, the socio-economic inputs (housing, population, etc.) will be updated. We've searched the Census website for data, but so far we've only been able to find ACS data at the county level. Is there any ACS data available at the block group or block level? Paul H Flavien PBS&J Planner- Transportation Planning 1901 Commonwealth Lane Tallahassee, FL 32301 (850) 575-1800 ext: 7884 Fax: (850) 575-1083 phflavien(a)pbsj.com

16 years, 6 months

[CTPP] 2006 ACS Data

by Flavien

Hi all, We are about to undertake a model validation. As part of the validation, the socio-economic inputs (housing, population, etc.) will be updated. We've searched the Census website for data, but so far we've only been able to find ACS data at the county level. Is there any ACS data available at the block group or block level? Paul H Flavien PBS&J Planner- Transportation Planning 1901 Commonwealth Lane Tallahassee, FL 32301 (850) 575-1800 ext: 7884 Fax: (850) 575-1083 phflavien(a)pbsj.com

16 years, 6 months

[CTPP] Census Nerws Brief

by ed christopher

Terri Ann has sent along her latest Census News Brief (attached). It discusses the status of funding for 2010 census preparations, the 2007 Economic Census, and other key milestones on the road to Census 2010. Needless to say as long as Congress continues to put the federal agencies (Commerce and the Census Bureau) under continuing resolutions preparations for the next census will be threatened. ----------------- Ed Christopher Resource Center Planning Team Federal Highway Administration 19900 Governors Drive Olympia Fields, Illinois 60461 708-283-3534 (V) 708-574-8131 (cell) 708-283-3501 (F)

16 years, 6 months

RE: [CTPP] 1990 TAZ boundaries - Question for the Listserv

by Nanda.Srinivasan＠dot.gov

Lance: Census TAZs in 1990 (and in 2000) were a function of census blocks, not tracts. You will need to find a Tract shape file for 1990, and perform aa geographic equivalency (using operations such as "intersect" etc...) to create an "equivalence" file. 1990 Census TAZ shapefile is posted at http://transtats.bts.gov/DL_SelectFields.asp?Table_ID=1258&DB_Short_Name=CT…. Select state = Missouri, and MPO = St.Louis. You should get a zipped file of all the geographies used in the 1990 CTPP for the "urban element." There was a CBD definition in 1990 data, and those shape files are also posted at the same URL. Thanks Nanda ________________________________ From: ctpp-news-bounces(a)chrispy.net on behalf of Huntley, Lance Sent: Mon 10/8/2007 11:53 AM To: ctpp-news(a)chrispy.net Subject: [CTPP] 1990 TAZ boundaries - Question for the Listserv Hi, I have been asked to find out if there is an equivalency file for 1990 TAZ geography to 1990 Census tract geography. I am not aware of anything like this but thought this listserv would be a good place to ask. Essentially the person asking the question has 1990 TAZ data and wants to link it to corresponding 1990 Census Tract boundaries. He comments in his request that there is something called a "Commuting Zone" in the 1990 geographies he has looked at, but isn't quite sure if this is a TAZ. Thanks in advance for any help received on this request. Lance Huntley East-West Gateway Councils of Government St. Louis, Missouri _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news

16 years, 6 months

[CTPP] HUD / USPS vacancy data

by Jonathan Lupton

Like Ms. Bousefield in Chicago, I find the HUD vacancy figures running very low. The ACS county-level vacancy data appear far more accurate in our area, but they are not available at the tract level yet. However, the HUD data do appear to reflect different characteristics of tracts - they correctly identify areas of generally higher vacancy. Therefore, I may be able to use the HUD figures to identify changes in vacancy by tract over time. The HUD figures do not separate businesses from residences. Therefore, like so many other sources, they are useful but not fully compatible with other data sets. Jonathan Lupton Metroplan - Little Rock AR

16 years, 6 months

[CTPP] Re: TAZs, TAZs Everywhere

by Sam.Granato＠dot.state.oh.us

70 pages?? It takes only one sentence to say zone boundaries need to be based on access to the network being modeled, period. Sam Granato Ohio DOT, Office of Technical Services 1980 W. Broad Street, Columbus, OH 43223 Phone: 614-644-6796, Fax: 614-752-8646 "You will be flogged for being right and flogged for being wrong, but it hurts less when you're right." - Hunter S. Thompson The Florida DOT has just posted a 70 page report discussing TAZs and their construction. While the information is for the model users community in Florida there is a wealth of information in the report that those who think about such things will find of interest. The document is well worth adding to any list of TAZs references that you may have. The report can be found on the Florida Transportation Modeling web site at http://www.fsutmsonline.net/index.php?/site/directory/model_docs The direct link to the report is http://www.fsutmsonline.net/images/uploads/reports/FDOT_TAZ_White_Paper.pdf

16 years, 6 months

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CTPP October 2007