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Trajectory Databases, Trajectory Mining, Popularity Estimation, Region of Interest.

The mining of the user GPS trajectories and identifying the interesting places have been well studied based on the visitor’s frequency. However, every user is given the same importance in the majority of the trajectory mining methods. In reality, the popularity of the place also depends on the category of the visitor i.e. international vs local visitors etc. We are proposing user category based location popularity estimation using the trajectories databases. It includes mainly three steps. First , pre-processing – the error correction and the graph connection establishment in the road network in order to be able to carry the graph based computations. Second , find the stay regions where the travelers spent some time off-the-road. The visitors can be easily categorized for each POI based on the travel distance from the home location. Finally , normalization and popularity estimation – measure the frequency and stay time of the visitors of each category in the places in question. The weighted sum of the frequency and stay time for each category of the visitors is calculated. The final popularity of the places is computed with values of the pre-configured range. We have implemented and evaluated the proposed method using a large real road GPS trajectory of 182 users that was collected in a period of over three years by Microsoft Asia Research group.