Aggregation and analysis of spatial data by means of materialized aggregation tree

In this paper we present a system of spatial data warehouse designed for aggregating and analyzing a wide range of spatial information. The data is generated by media meters working in a telemetric system. The data warehouse is based on a new model called the cascaded star model. The cascaded star is the spatial development of a standard star schema. We decided to use an indexing structure called aggregation tree. The aggregation tree materialization and integrated mechanism of available memory estimation highly improve the efficiency of the system. The theoretical aspects are confirmed by the presented tests results.