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Indexing the Imprecise Positions of Moving Objects

object environments, it is rarely possible for the database to record the exact positions of moving objects at all times. Very often, the database does not have the objects' precise positions due to update delay, sampling error, or limitation of measuring equipments. Information retrieval directly based on uncertain data is meaningless, since the result does not have any quality guarantee. Current database management systems with the exception of ORION do not provide a convenient means for representing or manipulating this type of uncertainty. In this paper, along with the concept of qualification probability and probability density function about moving objects, we introduce a general framework of monitoring and indexing moving objects with uncertainty region. Our goal is to quantify the query answer validity by efficiently computing the qualification probability of an object for satisfying kinds of queries.