KY Module 3: Geocoding and GPS - PowerPoint PPT Presentation

1 / 20
About This Presentation
Title:

KY Module 3: Geocoding and GPS

Description:

Complete it on 'their' time, not when the phone rings. ... reported trips (phone retrieval) to ... Tracking cell phone users in Germany and in Japan (Dokomo) ... – PowerPoint PPT presentation

Number of Views:39
Avg rating:3.0/5.0
Slides: 21
Provided by: Murak
Category:

less

Transcript and Presenter's Notes

Title: KY Module 3: Geocoding and GPS


1
KY Module 3 Geocoding and GPS
2
What is the single hardest information to get
from a travel survey?
  • Location, location, location
  • What is the address of YOUR grocery store?
  • Easiest to report are home and work location.
    Even school addresses are often difficult for
    respondents to report.

3
Difficulties in location reporting
  • Interviewer and processing difficulties
  • CATI interviewers not familiar with local
    landmarks
  • Multiple matches to GIS basefile (Main Street,
    Washington Street).
  • Respondent difficulties
  • Street suffix (St, Ave, Blvd)
  • Directionals (N, S, E, W, NE, SW, etc)
  • Difficult street names
  • CATI interviewers not familiar with local
    landmarks

4
Why do we need this geographic detail?
  • Attempt to code origins and destinations to
    latitude longitude.
  • Previously code to TAZs, but TAZs keep getting
    smaller, as computer technology allows for larger
    O/D matrices.
  • By coding to lat/long, TAZs can be modified in
    the future and the data can be summarized for new
    TAZ definition.
  • Want to link detailed geographic info to model,
    e.g. slope, sidewalks, distance to bus stop.

5
Better location information
  • How to make it easier on respondents to provide
    location information?

6
Can web-response play a role?
  • Complete it on their time, not when the phone
    rings.
  • Sample bias, but high income hhlds and young
    males are also part of non-respondents, and this
    method is useful for reaching these hhlds.

7
Geocoding on Internet
  • Interactive Yellow Pages look-up
  • Who knows the address of their grocery store or
    barber shop/beauty salon?
  • Point and click on a map to identify a location
  • Type in an address or intersection and have the
    GIS interface locate it on the map

8
GPS may be more accurate and complete, by relying
of passive data collection.
  • GPS equipment is small and getting less expensive
    everyday.
  • A new Trimble GPS receiver is the size of a
    pencil eraser! But, you still need an antenna.

9
GPS in Household Travel SurveysStudies in the
U.S.
  • 1995 Lexington, KY proof of concept (100
    vehicles)
  • 2001 CalTrans 3 counties in CA
  • 2001 SCAG (Ben Pierce)
  • 2001 Ohio DOT (Ben Pierce)
  • 2002 Smartraq Atlanta
  • TYPICALLY 200-500 HOUSEHOLDS, with up to 3
    vehicles equipped per hhld.

10
(No Transcript)
11
Example from Geostats
  • Comparison of self-reported trips (phone
    retrieval) to GPS recorded data
  • Estimated 25-30 of trips are unreported, but
    still working to determine impact on VMT, cold
    starts, trips by purpose

12
Example from Geostats
  • GPS generated maps as a recallmechanism.
    People may be able to recall what they did a week
    ago if provide a map with numbering sequence and
    time-stamp. Use of internet to pass Map to the
    respondent.
  • Test in Louisiana, continued work in Australia
    (Peter Stopher)

13
Other approaches
  • Equipping sample of taxis with vehicle navigation
    service in Japan
  • Tracking cell phone users in Germany and in Japan
    (Dokomo)
  • Activity Motivation and re-scheduling Sean
    Doherty

14
GPS in truck surveys
  • Very difficult to get good response rates from
    commercial vehicle surveys
  • One GPS survey in California (CARB and FHWA),
    conducted by Battelle
  • Only fleets were included, not independent
    truckers who make up 50 of the CA fleet.

15
GPS in truck surveys
  • Large fleets may already have GPS for fleet
    management, but not likely to share data with
    public sector, cuz it is considered proprietary
    information.

16
GPS for travel speed studies
  • Ability to cover large number of miles
  • Only need one person per vehicle (old fashion
    method with stop watches needed 2 people)
  • College students, working part-time, very
    comfortable with using palm-tops and laptops for
    data entry and data uploading.

17
Sample of digital video image, georeferenced to
GPS data
18
(No Transcript)
19
GPS for travel speed studies
  • Travel Speed along links
  • Travel speed compared to posted speed
  • Travel speed by functional class
  • Examine recurring congestion
  • Examine queuing length (defined when speed falls
    below 5 mph or less for 5 seconds)

20
Show 2 .jpg from Steves CD
Write a Comment
User Comments (0)
About PowerShow.com