Reference Work Entry

Encyclopedia of GIS

pp 1161-1168

Top-k Retrieval Techniques in Distributed Sensor Systems

  • Song LinAffiliated withDepartment of Computer Science and Engineering, University of California
  • , Demetrios Zeinalipour-YaztiAffiliated withSchool of Pure and Applied Sciences, Open University of Cyprus
  • , Dimitrios GunopulosAffiliated withDepartment of Computer Science and Engineering, University of California

Synonyms

Top-k query processing; Spatio-temporal similarity search

Definition

Fast developments in wireless technologies and microelectronics made it feasible to develop economically viable embedded sensor systems for monitoring and understanding the physical world [5]. Traditional monitoring approaches, like passive sensing devices, transmit their readings to a centralized processing unit for storage and analysis. Wireless Sensor Devices (WSDs) on the other hand, are tiny computers on a chip that is often no bigger than a coin or credit card. These devices, equipped with a low frequency processor (≈ 4–58 MHz) and a wireless radio, can sense parameters such as, light, sound, temperature, humidity, pressure, noise levels, movement, and many others at extremely high resolutions. The applications of sensor networks range from environment monitoring (such as atmosphere and habitant monitoring, seismic ...

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