A Smart Work Performance Measurement System for Police Officers
A Smart Work Performance Measurement System for Police Officers
Global
Positioning System (GPS) was developed by theUnited States in the 1960s, and it
was put into use in 1994 [1].It uses 24 satellites distributed in 6 orbits.
Once a receiverreceives signals from more than 3 satellites, the specific
posi-tion can be identified [2]. Up till now, GPS is the most suc-cessful
satellite positioning system in the world. In practice,many applications and
experiments use GPS, and it plays akey role [3]–[5]. The entire world benefits
from this advancedand powerful product in both military affairs and dailylife.
Gradually, more and more products have been devel-oped based on the utility of
GPS, for instance, navigationsystems that use GPS technology to guide travelers
and bustracking systems that use GPS technology to track specificbus locations.
Two popular and widely used applications,Google Map [6] and Yelp [7], adopt GPS
as well. Moreover,almost all cell phones currently have an installed GPS
device.Obviously, GPS use is everywhere. The service it provideshelp change the
world and make it a better place foreveryone.For many types of outdoor work,
such as road construction,policing traffic, oil exploration, railway work and
gardenmaintenance, the work schedule and location are planned inadvance and
vary frequently, even daily, and often, workersmay be given last-minute tasks
requiring a change in worklocation. For instance, a traffic officer often
receives someurgent tasks to address a traffic jam or traffic accident assoon
as possible to ensure smooth traffic and safe travel.Generally, the situation
where an employee does not workin his normally assigned area is referred to as
‘‘away fromwork location’’. The working areas planned in advance arearbitrary
polygons on a map, so we can judge whetherthe user is ‘‘away from work
location’’ by determiningwhether the employee’s location is in the polygon [8]
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