Census Transportation Planning Products
(CTPP)
Penelope Weinberger
CTPP Program Manager - AASHTO
Oregon SDC Meeting
(November 4, 2010)
1
What is the CTPP Program
Today?
The CTPP is an umbrella program of data
products, custom tabulations, training,
technical assistance, and research for the
transportation community.
CTPP uses American Community Survey
(ACS) data from U.S. Census Bureau.
WARNING!
Decennial Census has no Long Form – No
JTW data in Decennial Census!
2
History of CTPP
1960
1970
1980
Buyers/Users
Direct Cost
Tables
OMB
???
$0.6 M
???
43
$2.0 M
82
$2.5 M
$3.0 M
$5.8 M
120
203
200*
Individual
contracts (112)
Individual
contracts (152)
1990
Nationwide
2000
covering all States
today
and MPOs
CTPP Then and Now
CTPPackage
CTPProducts
Program
The CTPP program now includes:
– Data products
– Training and technical assistance
• On-call user support
• Training classes and web seminars
– Research
• Integration of data sources
• Disclosure avoidance
4
CTPP Program
Activities and Costs
Develop specialized
data products
63%
Conduct research,
training and outreach
21%
Manage the program
3%
Unallocated balance
12%
Total Program Costs
$5,844,332
5-Year Program: 2008 ~ 2012
5
CTPP Basics
• Planning Support for over 20 federal planning
requirements
• Data for supporting a wide variety of transportation
planning tasks
–
–
–
–
–
–
–
–
–
–
Policy studies
Travel demand modeling
Congestion management
Emergency preparedness
Corridor and project studies
Transit new start and service planning
Environmental justice studies
Air quality conformity
Environmental justice reviews
Trends analyses
CTPP Accomplishments
To Date
• State, Local and County Profiles for 2005-2007 are
completed and posted at the AASHTO website
• CTPP based on 3-Year ACS list finalized and Special
Tabulations delivered to FHWA and AASHTO in late
June/early July, with web-based delivery to practitioners
expected October/November 2010
• Data access software development underway – Beta
testing in November– Final in December
• Plans for a TRB Census Conference in fall 2011 are
underway
• CTPP based on 5-Year ACS (2006 – 2010) table list
developed as part of NCHRP 8-79 Disclosure Proofing
Research Project
Products and Things
3-year CTPP Data Product
CTPP 3-Year
September 2010
Oct/Nov 2010
2006, 2007, 2008
20,000 Pop. Areas
(County, Place, PUMAs)
Actual Flows
http://trbcensus.com/products
The 3-year Product Design
2000 Geography
Product Structure
Nation (US Total)
3-Parts
State
State-County
State-County-MCD
Part 1- Place of Residence
Part 2- Place of Work
State-Place
State-PUMA
State-POW PUMA
Metropolitan Statistical Area
MSA – EACH Principal City
Part 3- Flows between
Home and Work
with On-Line
Extraction Software
http://ctpp.transportation.org/Documents/CTPP_custom_tabulations_based_on_3yracs2006_2008.xls
3-year CTPP Product Summary
Highlights
Low Lights
Based on CTPP2000 Tables
Incomplete Coverage
Many NEW Univariate
Tables
Rounded
Reduced Number of
Crosstabs with Mode
More Age Tables
Streamlined Race Tables
More HH and HH Lifecycle
Tables
More English Proficiency
Tables
Way more Flows Tables
-- Travel time
-- Household income
-- Vehicle availability
-- Age
-- Time leaving home
Tables will have
Suppression
-- Means based on 3 values
-- 3 records in Flow
MOEs
Some Issues to be aware of
3-year ACS (2006, 2007, 2008)
What year is the
data?
Period Estimate
brought forward
to year of release
What Data to
use?
Reliability vs.
Currency
Significance Testing--Why do it?
MOE, MOE,
MOE
Source: CTPP Data Profiles http://ctpp.transportation.org/Pages/overview.aspx
http://www.edthefed.com/presentations/significance%20testing.ppt
Working with ACS
A Compass for
Understanding And
Using ACS Data
l Set of user-specific
handbooks
l Train-the trainer
materials
l E-learning ACS
Tutorial
http://www.census.gov/acs/www/UseData/Compass/compass_series.html
Quick Overview of ACS
•
•
•
•
•
Period Estimate, not Point in Time
~ 1 in 9 sample for 5-year data
Household based
Collected monthly and accumulated
One year
– Data released for areas 65,000 or greater
• Three Year
– Data released for areas 20,000 or greater
• Five Year
– Data released for All Geographies
• Subject to Disclosure Rules, of course
A word about Collapsing
3 unweighted records for each Mode
Collapsing
CTPP products collapsing schema
Accessing the
3-year data
• All available on a single easy-to-use free
website
– Free to use, but you do need to register
– Online help and tutorials help users along the way
• Create “sessions”, which are groups of tables
with a common geography selection
– Select geography using a map and/or drill down
through the geographic hierarchy
• Search for tables by dimension name or any
relevant word
– Either within one of the parts or across all parts
Viewing the data
• Open any table, either in your “session” or from the
public view.
• From there, you can customize your view of the data:
–
–
–
–
–
Rearrange dimensions
Make selections on any dimension
View charts
View the data on a thematic map
Aggregate items using standard functions or provide a formula
(margin of error will be recalculated for you for simpler formulas)
– Save your report for future use
– Save your selections and aggregations for use in other tables
Exporting the Data
• Once you have set up the table you want
to see, you can export it:
– Export the data in CSV, XLS or Beyond 20/20
(IVT) format for use in your own analysis tools
– Export SHP files for viewing maps in your own
GIS engine
• Entire “sessions” can be exported in a
single operation.
Products and Things
TAZ
• Software being developed by Caliper at
CB
• TAZ Delineation Business Rules
TAZ Size
• The Census Bureau recommends
– approximately 600 persons
• This minimum corresponds to the minimum threshold
allowable for 2010 Census block groups.
– threshold is guideline not a requirement.
– Base TAZ may be defined with fewer than 600
residents or workers
– as a general rule, data reliability and availability
improves as population size or number of workers
increases.
“NEW” TAZs Traffic Analysis Zones
• Developed in Summer 2011
• TAZs will nest with TADs
• GIS equivalency process
• Funded under Consolidated
Purchase
TAZ
Traffic Analysis Zone
TAD
Traffic Analysis
District
Traditional
Size
20,000
population
• FHWA is contacting state
DOTs to set up contacts
http://download.ctpp.transportation.org/TAZ_Rules/TAZ%2
0Delineation%20Business%20Rules_CTPP%20Final.pdf
Products and Things
Why are PUMAs Important?
NE Illinois (2008 pop estimate)
Let’s Look at Annual Data
●
●
●
●
Annual Data
65K+
Note the areas in gray
We call this
Swiss Cheese
Chicago
Why are PUMAs Important?
NE Illinois (PUMAs)
Tabulation Area for ACS
●
●
●
●
Represent 100K
Complete Coverage
Smaller than Counties
NO Swiss Cheese
How many PUMAs should this area have?
City of Chicago 2000 PUMAs
Why are PUMAs
Important?
- Defines areas for analysis
- Tabulation Area for ACS
Who Defines Them?
- The Community
- Led by State Data Center
When are They Defined?
- Summer 2011
- Criteria out Spring 2010
2,896,016 (2000 Pop)
http://www.census.gov/geo/www/maps/puma5pct.htm
Products and Things
5-year CTPP Data Product
New
Geography
Requires implementation of new disclosure avoidance
(“masking”) techniques
DRB rules for the CTPP 5-year tab
•
•
•
Cell Means and
aggregates require 3
unweighted records
For Pt 3 Flow Tables:
3 unweighted records
for each table, each cell, with the exception
of the 1-way Means of Trans. table
3 unweighted records for the marginal's in
any cross-tabulation with Means of Trans.
5-year CTPP Data Product
NCHRP 08-79 ($550K)
Producing Transportation Data Products from
the ACS that Comply With Disclosure Rules
NCHRP is funded by State DOTs SP&R
Project schedule: Jan 2010-July 2011
Fast-track with final report due in July 2011
Need results to be applied to 2006-2010 ACS for the
5-year CTPP (delivery to software vendor in
summer 2012)
http://rip.trb.org/browse/dproject.asp?n=22349
CTPP Oversight Board
17 Voting Members – 9 States, 8 MPOs
10 Ex-Officio Members
• Jennifer Finch,
Chair, CO
• Jonette Kreideweis,
Vice Chair, MN
• Laine Heltebridle, PA
• Nathan Erlbaum, NY
• Hui Wei Shen, FL
• Paul Agnello, VA
• Phillip Mescher, IA
• Ahmad Jaber, UT
• Ayalew Adamu, CA
•
•
•
•
•
Kuo-Ann Chiao, NYMTC
Mell Henderson, MARC
Arash Mirzaei, NCTCOG
Guy Rousseau, ARC
Clara Reschovsky,
MWCOG
• Pete Swensson, TRPC
• Vacancy*
• Penelope Weinberger,
AASHTO, CTPP
Program Manager
33
CTPP Oversight Board
Ex-Officio Members
• Ed Christopher, FHWA
• Alison Fields, Census
Bureau
• Rich Denbow, AMPO
• Elaine Murakami, FHWA
• Melanie Rapino, Census
Bureau
• Erika Young, NARC
• Alan Pisarski,
Consultant
• Steven Polzin, USF.
CUTR
• Nanda Srinivasan, TRB
• Ken Cervenka, FTA
AASHTO Census Data Work Group With 30+ Members
CTPP Federal Technical Advisory Group
TRB Subcommittees– List Serve (830 Members) & Quarterly Newsletters
34
CTPP Key Contacts
• Penelope Weinberger • Brian McKenzie
AASHTO
Census Bureau
CTPP Program
JTW & Migration
Manager
Statistics
202-624-3556
301-763-6532
pweinberger@aashto.org
brian.mckenzie@census.gov
http://ctpp.transportation.org
35