Transportation leadership you can trust.

presented to

Southeast Florida FSUTMS Users Group

presented by

Krishnan Viswanathan and Capton SiluvairajanCambridge Systematics, Inc.

February 8, 2008

Development of Journey to Work FlowsData and Visualization Tool

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Outline

CTPP Description

Project Objective

Data Development

Dynamic Visualization of Journey to Work (JTW) Flows

Summary and Future Work

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CTPP Description

The Census Transportation Planning Products (CTPP) provides tabulations of households, persons and workers

CTPP is a set of special tabulations from the decennial census designed for transportation planners

The data are tabulated from answers to the Census 2000 long form questionnaire, mailed to one in six U.S. households

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CTPP Description

Evaluate existing conditions

Develop or update travel demand models

Analyze demographic and travel trends

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Project Objective

CTPP Part 3 flow data good source for validating HBW trip tables

Geographic coverage of Part 3 data

• County

• Census Tracts

• TAZs (State and MPOs)

Compile TAZ-to-TAZ Journey-to-Work (JTW) tabulation from Census 2000, using the latest regional TAZ structures for Brevard, Indian River, St. Lucie, Martin, Palm Beach, Broward, and Miami-Dade Counties.

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Data DevelopmentModel Area

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Data DevelopmentProcess

Merge model areas

Universe is workers who live and work in the region

Area ratio at work end

Weighted population ratio at residence end

Worker flows that are equal to four are converted to five

Ratios less than one percent ignored

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Data Development Results

  FLOWS

Residence County Work County CTPP MODEL

Brevard Brevard 189,056 45,017

Brevard Indian River 3,445 2,752

Indian River Brevard 1,192 912

Indian River Indian River 39,072 35,120

Indian River St. Lucie 2,907 2,644

Martin Martin 34,150 29,294

Martin Palm Beach 9,926 9,548

Martin St. Lucie 3,703 3,333

St. Lucie Indian River 4,577 4,161

St. Lucie Martin 15,166 13,006

St. Lucie Palm Beach 4,248 3,755

St. Lucie St. Lucie 49,979 46,094

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Data Development Results

  FLOWS

Residence County Work County CTPP MODEL

Broward Broward 565,812 551,367

Broward Miami Dade 115,044 100,027

Broward Palm Beach 52,712 49,573

Miami Dade Broward 60,096 55,480

Miami Dade Miami Dade 823,642 702,066

Miami Dade Palm Beach 3,843 3,164

Palm Beach Broward 37,685 36,057

Palm Beach Martin 2,289 2,132

Palm Beach Miami Dade 5,560 3,962

Palm Beach Palm Beach 421,811 391,823

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Dynamic Visualization of JTW Flows

Dynamic visualization of flows between residence and workplace TAZs

ARCGIS desktop platform

Database is flow data developed for model TAZ structure

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Dynamic Visualization of JTW Flows

Four classes of Scenarios

• One residence TAZ to One workplace TAZ

• One residence TAZ to Many workplace TAZs

• Many residence TAZs to Many workplace TAZs

• Internal Trips

Can aggregate to County or State level

Export results to text file

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Summary and Future Work

CTPP Data provided at same geography as Travel Demand models

• Helpful to validate HBW trip tables

Visualization tool provides richer understanding of the flow between residence and workplace areas

Next iteration of tool will include mode shares of JTW flow

• Drive Alone

• Shared Ride

• Transit

Migrate to web based GIS platform

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Acknowledgements

Min-Tang Li

Shi-Chiang Li

Nanda Srinivasan