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Adding Value to Travel Behavior Surveys:. The Network Analyst Approach. Presentation by: Kearey L. Smith Stella Wotherspoon Metropolitan Transportation Commission San Francisco Bay Area, CA. August 10, 2006. ESRI User Conference 2006 San Diego, CA. Bay Area Travel Survey 2000.

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Adding Value to Travel Behavior Surveys:

The Network Analyst Approach

Presentation by:

Kearey L. Smith

Stella Wotherspoon

Metropolitan Transportation Commission

San Francisco Bay Area, CA

August 10, 2006

ESRI User Conference 2006

San Diego, CA


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Bay Area Travel Survey 2000

  • Regional household travel survey of the nine-county SF Bay Area

    • Activity-based reporting to capture all trips during study period

    • ~15,000 household respondents

    • ~ 229,000 intra-regional trips

  • Used for travel demand modeling and forecasting


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Goal for Extended GIS Analysis

  • To derive several new variables based upon precise home and work locations of survey respondents.

    • Move away from past analyses which are zone-based

    • Network Analyst 9.1 adds important tools to assist analysts with the development of new travel behavior models

    • New variables add significant value to the travel survey


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Primary Objectives for Extended GIS Analysis

  • Geocode all household and trip end locations from the survey

  • Append Standard Census Bureau and MTC Geography

  • Build Multi-modal Network Dataset

  • Derive Door to Door distances and time

  • Derive the walk distance to the closest transit stop(s)


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Primary Objectives for Extended GIS Analysis

  • Find stops that are within ¼, ½, and 1 mile walking distance from all households

  • Derive population and employment characteristics of all households and transit stops used in the study


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Primary GIS Tools Used to Conduct the Analyses

  • Arcmap Tools

    • Geocoding

    • Spatial Joins

  • Network Analyst Tools

    • Build Network & Calculate Network Locations

    • Find Best Route

    • Origin and Destination Cost Matrix

    • Service Area Tool

  • Spatial Analyst Tools

    • Zonal Statistics


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Build Network Dataset

  • A network dataset is the file set used by Network Analyst 9.1 to calculate routes and service areas, to locate closest facilities, and to produce origin-destination matrices

  • Used the TeleAtlas North America (TANA) Dynamap Transportation Database

  • Added Pedestrian Facilities for areas where none exist in the TANA Dynamap database

  • Can be as a shapefile or geodatabase feature class


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Build Network Dataset

  • Topology is crucially important


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Calculate Network Locations

  • Once this is done, tools will load locations quickly to the analysis layer

  • Ensure that locations are assigned to pedestrian accessible line segments


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Make Route Layer

  • Derive the door to door distance and estimated time for over 229,000 trip records

  • Developed a custom visual basic script that automates the calculation of each origin and destination trip pair


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Origin and Destination Cost Matrix

  • Derive the walk distance to the closet transit stop and the drive distance to the nearest transit park and ride facility

  • Very large Matrices require preprocessing of data


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Find Service Area

  • Create pedestrian buffers for all rail and ferry stops in the region

  • The result of this process was used in a spatial model to estimate total population and jobs


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Estimating Population and Employment Characteristics

  • A method had to be devised that accommodates the different shapes of the census tracts and the pedestrian buffers.

  • The Zonal function tools in Spatial Analyst can summarize a value raster based upon a zone defined by a polygon feature class.

  • The value raster is created using Census Tract data and Existing Land Use


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Zonal Statistics

  • Determine Population and Employment characteristics for each household and transit stop location in the survey

  • Developed a spatial model using Python scripting to automate the zonal statistic tabulation process


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Next Steps

  • Add Transit System as a Mode Choice

  • Measure Pedestrian Accessibility of each transit stop

  • Classify Transit Stops based upon the General Land Use Characteristics around each station location


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Adding Value to Travel Behavior Surveys

More Information

Download this presentation and report, as well as other info. from our Website @

http://www.mtc.ca.gov/maps_and_data/GIS/soundbytes.htm

Check out the Network Modeling and Analysis Section


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Adding Value to Travel Behavior Surveys

Contact Information

Mr. Kearey Smith

[email protected]

510-817-5738

Ms. Stella [email protected]

510-817-5969

Metropolitan Transportation Commission

101 Eighth Street

Oakland, CA 94607

www.mtc.ca.gov


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