Note: This metadata was prepared by the CRAWDAD team and verified by the data set (or tool) authors. We have made every effort to ensure its accuracy, but urge all users to consider the metadata and data carefully and be sure that their use in research is consistent with the nature and limitations of the data. We welcome any corrections.
This metadata was prepared based on the following reference(s):
|
version
| v. 2009-02-24 |
|
changes
| the initial version |
|
bibtex
|
@MISC{epfl-mobility-2009-02-24,
author = {Michal Piorkowski and Natasa Sarafijanovic-Djukic and Matthias Grossglauser},
title = {{CRAWDAD} data set epfl/mobility (v. 2009-02-24)},
howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/epfl/mobility},
month = feb,
year = 2009
}
|
| metadata last modified | 2009-02-19 |
| summary | This dataset contains mobility traces of taxi cabs in San Francisco, USA.
It contains GPS coordinates of approximately 500 taxis collected over 30 days
in the San Francisco Bay Area. |
| release date | 2009-02-24 |
| measurement start | 2008-05-17 |
| measurement end | 2008-06-10 |
| authors | Michal Piorkowski
Natasa Sarafijanovic-Djukic
Matthias Grossglauser
|
| license | If you intend to publish your results based on this data set, we appreciate if you cite the following publication in which we extensively use this data set:
@InProceedings{comsnets09piorkowski,
title = "{A Parsimonious Model of Mobile Partitioned Networks with Clustering}",
author = "Michal Piorkowski and Natasa Sarafijanovoc-Djukic and Matthias Grossglauser",
booktitle = "The First International Conference on COMmunication Systems and NETworkS (COMSNETS)",
location = "Bangalore, India",
year = "2009",
month = "January",
url = "http://www.comsnets.org",
details = "http://infoscience.epfl.ch/record/130383"
} |
|
web site
| http://cabspotting.org |
|
wiki
|
go to the wiki page for this data set
|
| keyword | GPS, MANET, location, vehicular network |
| measurement purposes | User Mobility Characterization
Location-aware Computing
Human Behavior Modeling
|
| network type | Vehicular network |
| network type | GPS (Global Positioning System) |
| environment | This data set contains mobility traces of taxi cabs in San Francisco, USA.
It contains GPS coordinates of approximately 500 taxis collected over 30 days
in the San Francisco Bay Area.
Cab mobility traces are provided by the Exploratorium - the museum of science,
art and human perception through the cabspotting project: http://cabspotting.org .
Cabspotting is designed as a living framework to use the activity of commercial
cabs as a starting point to explore the economic, social, political and cultural
issues that are revealed by the cab traces. Where do cabs go the most?
Where do they never turn up? Cab Projects are vehicles for artists, writers, or
researchers to explore these issues in the form of a small experiment,
investigation or observation. |
| network | Cab mobility traces are provided by the Exploratorium - the museum of science,
art and human perception through the cabspotting project: http://cabspotting.org .
"Each San Francisco based Yellow Cab vehicle is currently outfitted with a GPS
tracking device that is used by dispatchers to efficiently reach customers.
The data is transmitted from each cab to a central receiving station, and then
delivered in real-time to dispatch computers via a central server. This system
broadcasts the cab call number, location and whether the cab currently has a fare."(*)
You can use this data set of cab mobility traces that were collected in May 2008.
(*) http://cabspotting.org/about.html |
| collection | Each taxi is equipped with a GPS receiver and sends a location-update
(timestamp, identifier, geo-coordinates) to a central server.
The location-updates are quite fine-grained - the average time interval between
two consecutive location updates is less than 10 sec, allowing us to accurately
interpolate node positions between location-updates. |
| sanitization | Out of respect for the privacy of cab drivers and customers, no direct access
to cab data with identifiable cab numbers is provided to the public. The project
emphasizes the analysis of aggregate data and data patterns, with most of this
analysis happening on historic data and larger data patterns using scrambled cab numbers. |
|
tracesets included
| epfl/mobility/cab (v. 2009-02-24)
|
|
version
| v. 2009-02-24 |
|
changes
| the initial version. |
|
bibtex
|
@MISC{epfl-mobility-cab-2009-02-24,
author = {Michal Piorkowski and Natasa Sarafijanovic-Djukic and Matthias Grossglauser},
title = {{CRAWDAD} trace set epfl/mobility/cab (v. 2009-02-24)},
howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/epfl/mobility/cab},
month = feb,
year = 2009
}
|
| metadata last modified | 2009-02-19 |
| summary | This traceset contains mobility traces of taxi cabs in San Francisco, USA.
It contains GPS coordinates of approximately 500 taxis collected over 30 days
in the San Francisco Bay Area. |
| release date | 2009-02-24 |
| measurement start | 2008-05-17 |
| measurement end | 2008-06-10 |
| measurement purposes | User Mobility Characterization
Location-aware Computing
Human Behavior Modeling
|
| methodology | The cab locations are not stored by Yellow Cab, but only used in real-time
to aid dispatch. Our system talks to the Yellow Cab server and stores the data
in a database, encoding the call number for privacy. Server-side processes
computer the aggregate map at various time intervals
(10 minute, 1 hour, 8 hours, etc.) and store these frames as Postscript and
bitmap images. These are subsequently combined into movies for every day, week, etc.
Images and movies can be queried by visitors to the site in the Time Lapse area.
A sample of real-time data overlaid on the most recent map can be seen in the
Cab Tracker client.
You can collect your own cab mobility traces following the instructions from
http://cabspotting.org/api . |
| download url | Download (91MB gz)
(MD5 Hash: 8891f0bc3b2128ee903e9f9cb3018ce1) from US UK AU |
| parent data | epfl/mobility (v. 2009-02-24)
|
|
traces included
| epfl/mobility/cab/may_2008 (v. 2009-02-24)
|
|
version
| v. 2009-02-24 |
|
changes
| the initial version |
|
bibtex
|
@MISC{epfl-mobility-cab-may_2008-2009-02-24,
author = {Michal Piorkowski and Natasa Sarafijanovic-Djukic and Matthias Grossglauser},
title = {{CRAWDAD} trace epfl/mobility/cab/may_2008 (v. 2009-02-24)},
howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/epfl/mobility/cab/may_2008},
month = feb,
year = 2009
}
|
| metadata last modified | 2009-02-19 |
| summary | Mobility traces of taxi cabs in San Francisco, USA |
| derived | false |
| release date | 2009-02-24 |
| measurement start | 2008-05-17 |
| measurement end | 2008-06-10 |
| configuration | This archive contains file '_cabs.txt' with the list of all cabs and
for each cab its mobility trace in a separate ASCII file, e.g. 'new_abboip.txt'. |
| format | The format of each mobility trace file is the following - each line contains
[latitude, longitude, occupancy, time], e.g.: [37.75134 -122.39488 0 1213084687],
where latitude and longitude are in decimal degrees, occupancy shows if a cab has
a fare (1 = occupied, 0 = free) and time is in UNIX epoch format. |
| parent data | epfl/mobility/cab (v. 2009-02-24)
|
