Trajectory data visualization : the visualhermes tool

Abstract

Composition of time and space in a unified data framework results into spatio-temporal databases. Spatiotemporal Database Management Systems (STDBMS) are able to process, manage and analyze spatiotemporal data. HERMES provides spatio-temporal functionality to Oracle 10g Object-Relational Database Management System (ORDBMS). It introduces time-varying geometries that change their position and/or extend in space and time dimension either discretely or continuously, extending PL/SQL, the data definition and manipulation language of Oracle 10g, with spatio-temporal semantics. Currently, its main use is for representing moving objects (cars, trucks, people etc.) trajectories. The problem of geospatial data interoperability has been an issue throughout the Geographic Information Systems (GIS) industry for a long time. This thesis is focused on two domains:in designing and implementing a wrapper for transforming raw HERMES’s data into GML entities and process specialized GML queries sent to the database and transforming these GML results into KML files for visualization purposes, via third-party projection engines.