AMPO Travel Modeling Work Group November 5, 2010 Ed Christopher Resource Center Planning Team Federal Highway Administration 4749 Lincoln Mall Dr. Rm 600 Matteson, IL 60443 708-283-3534 [email protected]Topics • Boundaries • 3-year CTPP/ACS • 5-year CTPP • TAZs/TADs • PUMS/PUMAS Update on Census Info and Planning Products/ Getting Ready for TAZ Delineation
AMPO Travel Modeling Work Group November 5, 2010. Update on Census Info and Planning Products/ Getting Ready for TAZ Delineation. Topics Boundaries 3-year CTPP/ACS 5-year CTPP TAZs/TADs PUMS/PUMAS. Ed Christopher Resource Center Planning Team Federal Highway Administration - PowerPoint PPT Presentation
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AMPO Travel Modeling Work GroupNovember 5, 2010
Ed Christopher Resource Center Planning TeamFederal Highway Administration
oo Reducing Jumps from 2.5 miles to 1.5oo Use of a National Land Cover Data Baseoo Changing Airport threshold from 10K to
2,500 enplanementsoo Eliminating the Central Place Conceptoo Establishing Minimum pop living
outside of group quartersoo Splitting Large Areasoo Naming Criteria
Highlights of Federal Register Notice
Comments due November 22, 2010
ACS Data Releases
Tract and Block Group
5-year Period
20,000+3-year Period
65,000+Annual
Data for the Previous Year Released in: 2006 2007 2008 2009 2010 2011 2012+
PopulationSize of Area
DataType
And then the CTPP
Census Transportation PlanningProducts (CTPP) Program
The CTPP is an umbrella program of Census related data products, custom tabulations, training, technical assistance, and research for the transportation community
Based on CTPP2000 TablesMany NEW Univariate TablesMore Age TablesStreamlined Race TablesMore HH and HH Lifecycle TablesMore English Proficiency TablesWay more Flows Tables
Incomplete CoverageRoundedReduced Number of Crosstabs with Mode
-- 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
What year is the data? Period Estimate brought forward to year of releaseWhat Data to use? Reliability vs. Currency
Take the map at the right and using the states boundaries make 9 contiguous regions
It’s the same for TAZsBlocks
cluster into TAZs
A real world example
● Census Blocks will make up TAZs
● TAZs will nest with TADs
● TADs will nest in Counties
●Nesting with Tracts is optional
TAZ Size
CB recommends~600 persons
corresponds to the minimumthreshold for 2010 Census Block Groups
Threshold is guideline not a requirementTAZs may be defined with fewer than 600 residents or workers Data reliability and availability improves as population size increases
Bigger is Better
The Schedule
Nov 2010 - Agencies verify contact names (AASHTO Website)
Jan 2011 - Final delivery of Software by CaliperFeb 2011 - Web-based training
Feb 25 and Feb 28
March through April 2011 - Delivery of software and Census 2010 data and geographic files (Rolling basis)
3- Months to delineate TAZ/TADs
June through July 2011 - Files returned to CB Geography
• Asymmetrical Flows• Small Areas defined by MPOs in MPO areas and States Elsewhere• Tracts are Defaults for Small Areas• Default TADs under discussion
PUMAs? -- What are they?
PUMAs are the zones used from PUMS data
Public Use Microdata Sample
PUMS data is based on individual census records and is available only at large geographic areas. Think of the PUMS dataset as the raw, disaggregate census sample data, at a large enough geographic level necessary to protect the confidentiality of the census respondent.
ACSSample
Standard Tabs
PUMS Records
Why are PUMAs Important?
Let’s Look at Annual Data● Annual Data● 65K+● Note the areas in gray● We call this
Swiss Cheese
NE Illinois (2008 pop estimate)
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?
http://www.census.gov/geo/www/maps/puma5pct.htm
City of Chicago 2000 PUMAs
2,896,016 (2000 Pop)
Why are PUMAs Important?
- Defines areas for analysis - Tabulation Area for ACS - Custom Tabulation
Who Defines Them? - The Community - Led by State Data Center
When are They Defined? - Summer 2011 - Criteria out Spring 2010