The CTPP Working Group is currently developing summary levels for reporting CTPP 2000 data. A summary level in CTPP 2000 is a geographic unit of reporting. For example, urban TAZ is a reporting summary level. The hierarchy of reporting TAZs will be State-County-TAZ (meaning that State level totals, County level Totals will be present as separate records).
We want your inputs on two reporting issues. Attached is a document (listservsumlev.doc) that explains these issues.
Please send your suggestions to Nanda Srinivasan (Email: ctpp(a)fhwa.dot.gov, Phone: 202-366-5021)
Call for Poster Session Papers/Presentations
The Subcommittee on Census Data for Transportation Planning (A1D08-1) is
interested in developing a poster session for the 81st TRB Annual
Meetings in January 2002. The subject of the poster session will center
on the innovative and creative ways, in which census related data is
being presented, displayed or delivered.
Under the TRB guidelines, a poster session is a series of presentations
on vertical display boards with direct interaction between the presenter
and attendees. The entire presentation is placed on a display board and
should be considered the equivalent to the conventional paper or
Typically, a TRB Poster Session is made up of reviewed papers. However,
due to the evolving nature of the subject and the fact that the US
Census related data is just now being released--time is
short--presentations will be considered.
Individuals interested in sharing some of the innovative and creative
ways in which they are displaying and making Census data available
within their transportation community are encouraged to "show their
work". Those seeking publication as part of the TRB Research Record
series need to have their paper submitted, according to TRB guidelines
no later than August 1, 2001. For more information on the paper
submittal process or the Annual meeting refer to;
For those wishing to present their materials without seeking full
publication may submit an abstract by August 1, 2001 to Ed Christopher,
Chair of the Subcommittee on Census Data for Transportation Planning at
the address and phone number below.
More detailed information and general instructions for a TRB Poster
Session can be found at
Should you have any questions please contact either Ed Christopher,
Subcommittee Chair, or Chuck Purvis Chair of the Urban Data and
Information Systems Committee (A1D08).
Transportation Industry Analyst
Bureau of Trans. Statistics K-30
400 Seventh Street, SW
Washington D.C. 20590
Chuck Purvis, AICP
Senior Transportation Planner Metropolitan Trans. Commission
101 Eighth Street
Oakland, CA 94607
The Census Bureau started release of Summary File 1 (SF1) data from June 13, 2001 on a state-by-state basis.
SF1 contains the 100-percent data, which is the information compiled from
the questions asked of all people and about every housing unit. Most of the SF1 data is reported at the Census Block level. Since the Transportation Analysis Zones defined in TIGER/Line 2000 are aggregations of Census Blocks, transportation planning agencies can assemble SF1 data for their TAZs.
Attached is a note on SF1 data and a process to convert SF1 data to your TAZs.
Note to SAS and SPSS users: A code to automate the data transfer is posted at:
Agencies have written to the CTPP Working Group asking:
If TAZs defined in TIGER/Line 2000 can be altered/changed.
Can an agency submit new TAZs in Urban areas based on TIGER/Line 2000 geography for CTPP 2000?
The CTPP Working Group met on June 14, 2001 to discuss these issues. We decided that agencies could define new TAZs or alter TAZs in TIGER/Line 2000 and obtain CTPP 2000 data reported for the new TAZs. However, agencies must use Census 2000 tabulation blocks to build new TAZs or alter existing TAZs. In effect, an equivalency file between census blocks and TAZs will be built and used, as was done in previous censuses.
However, due to processing issues and schedule considerations, agencies wishing to do this should note the following:
1. Cost: To change TAZs or define new TAZs, agencies must separately contract with the Census Bureau, Journey to Work Branch, and work out a process and cost for defining and obtaining CTPP 2000 data based on the new TAZs.
2. Schedule: CTPP data will be processed for those agencies after the Standard CTPP 2000 products are released for the whole country. Currently, the expected completion date for CTPP 2000 is June 2003.
3. Exclusion of the changes from TIGER/Line database: There are no plans or processes in place to include new TAZs in the TIGER/Line database. Thus, the changes will not be reflected in TIGER/Line 2000 and it is unlikely that new TAZs will be inserted into TIGER until the next round of TAZ updating, the date of which has not been scheduled.
For more information, please contact Phillip Salopek, Census Bureau, Population Division (Journey to Work Branch) at 301-457-2454 (e-mail: phillip.a.salopek(a)census.gov).
We have been working on defining the proposed urbanized area for our
However, we are encountering some issues with the "hop" step -- namely,
is there a quicker way in ArcView to identify eligible blocks or other
unconnected densely populated areas (BG cores + blocks) not contiguous
to the "core" (and their corresponding connecting paths), rather than
manually determining the shortest qualifying path between the block and
the core for each individual instance?
Haila R. Maze, Senior Planner
Berkeley Charleston Dorchester Council of Governments
5290 Rivers Avenue, Suite 400
North Charleston, SC 29406
(843) 529-0305 fax
From: Elaine Murakami [mailto:Elaine.Murakami@igate.fhwa.dot.gov]
Sent: Monday, April 09, 2001 12:31 PM
Subject: [CTPP] INFORMATION: Urbanized Area Proposed Definition
This information (probably in revised form) will be sent to the FHWA
field offices within the next day. However, I am sending this along to
the CTPP listserv to get it out as soon as possible.
Attached is a document to assist those areas which may want to evaluate
what the impact of the proposed definition of Urbanized Areas may be for
their area. You will need to know how to use GIS to conduct this
evaluation. While we conferred with the Census Bureau staff to assure
that these notes are correct, we cannot guarantee them. You will want
to print this in COLOR to be able to read the maps. Technical questions
should be addressed to ua(a)geo.census.gov. You may also call the Census
Bureau Geography Division at 301-457-1099.
Comments to the Federal Register notice (posted at
www.census.gov/geo/www/ua/ua_2k.html) are due by April 27, 2001.
Comments should be submitted to Director, U.S. Census Bureau, Room 2049,
Fedral Building 3, Washington, D.C. 20233-0001.
The FHWA Office of Metropolitan Planning prepared these notes to assist
local areas, however, we will not be checking individual areas against
these proposed criteria, and will not be able to provide technical
assistance in operating ArcView or ArcInfo.
The Census Bureau makes a distinction between special places and group
quarters. It's kind of arcane, and in cases where it's just one facility
where the administration takes place at the same address that houses the
residents, it doesn't really matter. But in the case of multiple college
dorms it can matter a lot.
In the case of a college, the special place is the contact point for the
enumeration, most likely the college housing office.
The individual dorms are each a separate group quarters.
It sounds to me like they geocoded all the GQ facilities to the address of
the special place. I'd be willing to bet that the block where all the
Cornell students are enumerated is where the housing office is located.
This is sloppy, sloppy work and yes, they should fix it before SF3!
Patricia C. (Patty) Becker 248/354-6520
APB Associates/SEMCC FAX 248/354-6645
28300 Franklin Road Home 248/355-2428
Southfield, MI 48034 pbecker(a)umich.edu
It looks like SF (Summary File) 1 data is starting to be released on a
flow basis. Delaware is now out and Vermont appears to be right
behind. Below is a link to a weekly release schedule that is posted on
a special page on the Census Bureau's Web site.
Bureau of Transportation Statistics
U.S. Department of Transportation
400 Seventh Street SW
Washington DC 20590
We are looking for a way to geocode addresses in our 7 county region using Arcview and TIGER. Our problem is street addresses with similar address ranges that occur in several civil divisions. We have built a file containing all the TIGER data for each of our 7 counties. We are looking for information on how to incorporate the civil division name in the address coding process. Our experience to date has been that Arcview selects the first address range it encounters and assigns that geocode.
Does anyone have any suggestions?
Southeastern Wisconsin Regional Planning Commission
916 N. East Avenue
Waukesha, WI 53186
would someone be able to send me a link to the spot where one can download
ZCTA geography? I had it once but cant seem to find it or get back there..
Transportation Planner/GIS Coordinator
AVCOG, 125 Manley RD, Auburn, ME 04210
Phone (207) 783-9186
Faxx (207) 783-5211
I found that if you change the extension of the unzipped files to a .csv
extension, then you can use ACCESS 2000. ACCESS 97 will work as well, but
it does have a few more kinks.
City of Tyler
Metropolitan Planning Organization
Off: (903) 531-1175
Fax: (903) 531-1170