Visualization of streaming trajectories

One of the basic requirements when managing moving objects in data stream management systems (DSMS) is visualization of continuous queries results on the map. In most cases, the result of a continuous query is data stream whose elements contains information about locations of moving objects so that we are talking about visualization of streaming trajectories. Such visualization involves redrawing the location of moving objects for each new arriving element of data stream that represents the result of a continuous query. In this paper we present an application that allows you to pose continuous queries and visualize their results in OCEANUS DSMS prototype for managing spatio-temporal data streams. The application is based on the Java programming language, swingx-ws library for interacting with web services and OpenStreetMap web service that provides free maps of the world. The application allows users familiar with CSQL to pose queries directly using this query language, while beginners can pose a query through creating the conditions by selecting one or more operations from a set of basic operations on moving objects. In addition to presenting current positions of each moving object which satisfies the condition of continuous query it is also enabled to view the entire trajectory of a moving object.