12 e 13 de junho de 2000, Centro Anhembi, São Paulo, SP
Movement is change in location over time. A geospatial lifeline model movement as a time-stamped record of locations that an individual has occupied over a period of time. This paper distinguishes three types of geospatial lifelines. Lifeline steps capture discrete movement associated, for example, with modeling residential histories. Lifeline threads model the likely locations that an object might pass through while continuously moving between two locations. Lifeline necklaces offer different semantics as they describe the set of all possible locations that an individual might pass through when moving between A and B. We demonstrate the rich set of methods to query lifeline necklaces and their elementary building blocks, lifeline beads, through analytical geometry operations upon cones.
Oracle Spatial: Experiences with Extensible Databases
Object relational databases have become the new standard for addressing the growing data management and analysis needs of non-traditional database applications such as Spatial Information Systems. Two critical issues must be resolved in order to effectively meet the requirements of these applications. They are: (i) representation and (ii) content based search of spatial data. Oracle Spatial addresses these issues by providing a spatial data type (SDO_GEOMETRY), an indexing mechanism, and functions/operators on the spatial data type. It enables spatial data to be stored, accessed, indexed, and nalyzed quickly and efficiently in an Oracle8i database. This gives application developers the facility to store all locational information within an ndustry standard database server without having to resort to custom-built external indexes and functions to get the performance they need. Users of spatial data also gain access to standard Oracle8i features such as bigger database size limits, faster backup and recovery, and Java in the database.