先進網際服務系統

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The document describes ParkNet, a system that uses vehicles equipped with GPS and ultrasonic sensors to detect available parking spaces as they drive by. The sensors can identify parked and vacant spaces, which are sent to a central server along with location data. The server collects this information to generate up-to-date maps of parking availability across a city to help drivers more easily find parking. The system was tested in two areas of San Francisco and was able to accurately detect parking spaces 95% of the time and generate occupancy maps that were over 90% accurate.

PARKNET：DRIVE-BY SENSING OF ROAD-SIDE
PARKING STATISTICS

先進網際服務系統
HOMEWORK 9-17-2011

PURPOSE
 因應現今汽車量產及
使用的普及，且停車
位供不應求的情況，
駕駛者在都會地區找
尋停車位麻煩且耗
時。筆者定義了一套
「ParkNet」系統，透
過車輛行駛中收集停
車位的資訊，並提供
欲停車的駕駛者可以
容易的找到停車位，
以節省時間及燃料的
耗費

METHOD & TOOLS
 GPS
Each ParkNet vehicle is equipped with a
GPS receiver.
Using environmental fingerprinting to
achieve
the location accuracies

 Ultrasonic rangefinder
cost-effective.
water-proof.
mount the side of a vehicle.

 Central Server
information collected.
parking space counts.
assign

VACANT SPOT DETECTED

Detecting parked cars and vacant space by ultrasonic sensor
fitted on the side of a car

STRUCTURE OF PARKNET

. Parking space
Unslotted
Slotted
. Map
. Navigation devices
. Parking enforcement

BOTTLENECK

A moving and fixed objects will produce dips in the sensor trace
that were classified incorrectly as parked cars

MOBILITY STUDY

. Two areas of San Francisco where to monitor the
movements of 536 taxicabs over a stretch of one month.
. The areas with highest presence are also the busiest areas
with most street –parking.

CONCLUSION

Achieve about 95% accurate parking space counts and
generate over 90% accurate parking occupancy maps

Using environmental references points to correct GPS errors
correlated with over time and space even with WAAS
support

The density of taxicabs in an urban area will be strongly
correlated with the presence of street parking spaces

REFERENCE

Suhas Mathur, Tong Jin, Nikhil Kasturirangan, Janani
Chandrasekaran, Wenzhi Xue, Marco Gruteser, Wade Trappe
ParkNet: drive-by sensing of road-side parking statistics
International Conference On Mobile Systems, Applications And
Services
Proceedings of the 8th international conference on Mobile
systems, applications, and services San
Francisco, California, USA
SESSION: Automotive applications
Pages: 123-136
Year of Publication: 2010

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1. PARKNET：DRIVE-BY SENSING OF ROAD-SIDE PARKING STATISTICS 先進網際服務系統 HOMEWORK 9-17-2011

2. PURPOSE  因應現今汽車量產及使用的普及，且停車位供不應求的情況，駕駛者在都會地區找尋停車位麻煩且耗時。筆者定義了一套「ParkNet」系統，透過車輛行駛中收集停車位的資訊，並提供欲停車的駕駛者可以容易的找到停車位，以節省時間及燃料的耗費

3. METHOD & TOOLS  GPS Each ParkNet vehicle is equipped with a GPS receiver. Using environmental fingerprinting to achieve the location accuracies  Ultrasonic rangefinder cost-effective. water-proof. mount the side of a vehicle.  Central Server information collected. parking space counts. assign

4. VACANT SPOT DETECTED Detecting parked cars and vacant space by ultrasonic sensor fitted on the side of a car

5. STRUCTURE OF PARKNET . Parking space Unslotted Slotted . Map . Navigation devices . Parking enforcement

6. STUCTURE OF PARKNET

7. BOTTLENECK A moving and fixed objects will produce dips in the sensor trace that were classified incorrectly as parked cars

8. MOBILITY STUDY . Two areas of San Francisco where to monitor the movements of 536 taxicabs over a stretch of one month. . The areas with highest presence are also the busiest areas with most street –parking.

9. CONCLUSION Achieve about 95% accurate parking space counts and generate over 90% accurate parking occupancy maps Using environmental references points to correct GPS errors correlated with over time and space even with WAAS support The density of taxicabs in an urban area will be strongly correlated with the presence of street parking spaces

10. REFERENCE Suhas Mathur, Tong Jin, Nikhil Kasturirangan, Janani Chandrasekaran, Wenzhi Xue, Marco Gruteser, Wade Trappe ParkNet: drive-by sensing of road-side parking statistics International Conference On Mobile Systems, Applications And Services Proceedings of the 8th international conference on Mobile systems, applications, and services San Francisco, California, USA SESSION: Automotive applications Pages: 123-136 Year of Publication: 2010

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