Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Probabilistic Spatial Queries

  • Reynold Cheng
  • Jinchuan Chen
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_276

Synonyms

Imprecise spatial queries

Definition

An uncertain item is defined as a range-limited probability density function (pdf) in a multi-dimensional space, which can model the uncertainty of location, sensor and biological data. Given a set of uncertain items, a probabilistic spatial query returns results augmented with probabilistic guarantees for the validity of answers. The impreciseness of query answers is an inherent property of these applications due to data uncertainty, unlike the techniques for approximate processing that trade accuracy for performance. New query definitions, processing and indexing techniques are required to handle these queries.

Historical Background

Data uncertainty is an inherent property in a number of important and emerging applications. Consider, for example, a habitat monitoring system used in scientific applications, where data such as temperature, humidity, and wind speed are acquired from a sensor network. Due to physical imperfection of the...

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Computer ScienceThe University of Hong KongHong KongChina
  2. 2.Key Laboratory of Data Engineering and Knowledge Engineering, Ministry of EducationRenmin University of ChinaBeijingChina