Dear Everyone –
We are awaiting the delivery of the first 3-year CTPP using
2006-2008 ACS records. This CTPP is restricted to large geography (county,
places with 20,000 population and over). Our goal was to have web-accessible
data in September 2010, but today we learned that the CB now has a delay of 2
weeks, which MAY impact the delivery schedule from Beyond 2020 and Citygate,
the CTPP data access software vendors. We will keep you updated.
In the meantime, you are probably putting together your annual
workplans and I want to remind everyone who plans to submit TAZ (and TADs) for
the 5-year CTPP tabulation to include labor hours for Spring and Summer 2011
for this task.
For a copy of the TAZ delineation business rules:
Q.
Do you have to define TAZs or TADs?
A.
No, you can still get CTPP tabulations for Census
tracts or Census block groups if you do not want to delineate TAZs.
Q. What is a TAZ and what is
a TAD?
A. A TAZ is a Transportation
Analysis Zone and is the smallest geographic unit for which the CTPP
tabulations will be provided. A TAD is a Transportation Analysis
District, and will either be an accumulation of TAZs, or accumulation of
tracts, to total approximately 20,000 population. This will provide a
geographic unit that is smaller than a PUMA (100,000 population), and larger
than a census tract (4,000 population). The TAD is larger geographic unit
which has the potential to be used in nation-wide tabulations for 3-year ACS
tabulations in the future.
Q. What process will be used
to submit TAZs?
A. some of you probably saw
the Caliper announcement that they will be developing the software for the
Census Bureau’s Geography Division for this part of the CTPP.
It will be a GIS-based application and will not require you to purchase or
license any additional software. It will be a block-equivalency
program. That is, you are restricted to existing Census-defined blocks.
This means that your agency’s TAZ for your forecasting model may not
exactly match the TAZ submitted for the CTPP tabulation.
Elaine Murakami
FHWA Office of Planning
206-220-4460