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Activity-Based Models and ACS Data. D. Niemeier University of Califonia, Davis. Introduction. Overview of primary data products Overview of activity-based models Key data needs for emerging models Advantages and disadvantages of ACS. Primary Data Products. Census Microdata Sources

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Activity based models and acs data

Activity-Based Models and ACS Data

D. Niemeier

University of Califonia, Davis


Introduction
Introduction

  • Overview of primary data products

  • Overview of activity-based models

  • Key data needs for emerging models

  • Advantages and disadvantages of ACS


Primary data products
Primary Data Products

  • Census Microdata Sources

    • Decennial Census PUMS

    • ACS PUMS

  • Census STF3A (SF3, 2000)

  • CTPP

  • NHTS

  • ACS Tables


Current practice
Current Practice


Activity based models
Activity-Based Models

  • In general, key step in which census or “other than travel survey” data plays a role:

    • Generation of synthetic households/population

      • TAZ using socio-economic variables (PUMS)

  • Other steps similar for both 4-step and activity-based (e.g., calibration/validation)


Population synthesis
Population Synthesis

MORPC Pop. Synthesis Model



Practical issues research needed
Practical Issues/Research Needed

  • Geographic resolution

  • How to map between or fuse data sources

  • Need for demog. data at HH and person-level

  • ACS defining HH characteristics may not match census information

  • Finally, more research and information on control variables, use and affect within ACS


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