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GIS Applications for Origin-Destination Surveys

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GIS Applications for Origin-Destination Surveys Greg Spitz and John Lobb Resource Systems Group gspitz_at_rsginc.com jlobb_at_rsginc.com Daniel Jacobs – PowerPoint PPT presentation

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Title: GIS Applications for Origin-Destination Surveys


1
GIS Applications for Origin-Destination Surveys
Greg Spitz and John Lobb Resource Systems
Group gspitz_at_rsginc.com jlobb_at_rsginc.com Daniel
Jacobs MTA Bridges Tunnels Wayne
Bennion Wasatch Front Regional Council
2
Origin-Destination (OD) Data
  • Critical basis of knowledge for transportation
    operations, modeling, and future planning
  • Essential for all transportation modes
  • Often collected by DOTs and transit agencies, but
    not (yet) often analyzed with GIS
  • OD data are inherently spatial, and visualization
    is key to understand them, thus the need for GIS

3
Origin Destination Surveys
  • Provide insights to
  • Who the customers are
  • Why customers are traveling
  • How long they are traveling, and
  • Where they are traveling, etc.
  • Labor intensive data collection efforts
  • Used to understand current demand and plan for
    future demand
  • Critical data for calibrating travel models

4
GIS Tools in action
  • MTA Bridges and Tunnels largest toll agency in
    US
  • Wasatch Front Regional Council Utah Transit
    Authority transit on-board survey
  • Two different agencies, modes, and application
    purposes
  • GIS the common denominator to solve issues for
    these different purposes

5
2004 MTA BT Origin Destination Survey
  • Conducted roughly every 8-10 years
  • 2004 Study
  • 304,000 surveys distributed in CASH lanes
  • 329,000 surveys mailed to E-ZPass customers
  • Control Data collected in both CASH and E-ZPass
    lanes with Pocket-PCs
  • E-ZPass sample from BT, PANYNJ, NYSTA, NYSBA,
    and NJRSC comprising 99 of all transactions
  • Survey period 6AM to Midnight Weekday, Saturday,
    and Sunday

6
MTA BT Survey TAZ Structure
  • All zones are based on zip codes
  • Geocoding of survey data only necessary to the
    zip code level
  • Aggregations of zones used to form super zones

7
GIS using static maps
  • Static analysis with better presentation
  • Easy to put together quickly
  • Becoming more and more typical

8
Survey Zone Map Close-up
DRAFT
9
Super Zone Map
10
Example of Static Map using super
zonesBronx-Whitestone Bridge Bronx Bound
11
GIS Tool Purpose
  • Take geospatial data and make it easier to
    visualize, analyze, and interpret
  • Allow more in depth analyses beyond static
    reports
  • Make the tool easy to use, so even a (skilled)
    monkey can use it
  • Leverage GIS experts skills without taking too
    much of their time

12
How was the tool made?
  • ArcMap extension
  • Access DB backend
  • Currently developed to be a stand alone tool
    (could be made to be network/web enabled)
  • Simple user interface created using VB
    development environment

13
Income Distributions by Origin Zones
14
Vehicle Occupancy by Origin Zone
15
Specific Trip Analysis
16
Travel Pattern Analysis
17
2006 WFRC On-Board Transit Survey
  • 3 surveys conducted in last 15 years
  • Data primarily used for travel model development
    and forecast refinement
  • 2006 survey
  • Surveyed riders on 90 bus routes and the TRAX
    rail system
  • Collected 5,600 surveys

18
OD Data Mining is Cumbersome
  • Survey database has over 100 columns and 5600
    rows (difficult to view all relevant variables at
    once)
  • TAZ number and/or address text may not be
    immediately recognizable (data is spatial)

19
GIS Tool Purpose (WFRC)
  • Preliminary review of the data suggested that the
    2006 survey transfer rates were unreasonable
  • Interest in examining individual survey records
    efficiently

20
GIS tool (WFRC)
  • Goals
  • Local QA/QC
  • Efficiently examine each record
  • Easy data editing/entry
  • Gain confidence in the data used for model
    calibration (e.g. transfer rates)
  • Features
  • Custom ArcGIS application
  • Visualize transit path details for one record at
    a time
  • Routes
  • Origin/Destination
  • Boarding/Alighting
  • Data viewing/editing window

21
Screen capture of GIS Tool
Reported data
22
Survey Errors Identified
  1. People reported multiple paths they sometimes
    take, rather than simply their current path
    (question 7)
  2. Inconsistency between routes and OD pair
  3. Geocoding errors
  4. Illogical route sequence

23
Example of Multiple Paths between same OD Pair
24
Another example of multiple paths between same OD
pair
25
Summary
  • Application clearly identified obvious
    inconsistencies and errors, resulting in a more
    reliable database.
  • Visualization of these records would also be
    extremely helpful in assessing survey design and
    reducing respondent error.

26
User-friendly GIS tools developed for planners
and analysts
  • GIS tools allow planners and others to drill down
    on the data
  • Tool interface confines the problem (both a good
    and bad thing)
  • Interface makes analysis much easier and doesnt
    require in-depth software/data knowledge
  • Tools allow analysts to get more out of their
    data collection investment

27
Questions ?
  • Please use the Microphone.
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