Selection of Optimal Measurement Point Density in Travel Time Mapping: Warsaw Airport Case Study

In the study, a selection of an optimal density of measurement points in travel time mapping was undertaken. The study was related to the territory of Warsaw and travelling to the Warsaw Frederic Chopin Airport with the use of public transportation. The measurement points from which travel times were calculated, were selected using the self-acting method and the jakdojade.pl online service. They were automatically arranged in three different grids with a mesh of 500 m, 1000 m and 2000 m. Travel times were calculated for each measurement point. The measurement data was current on March 2016. The estimated travel time was evaluated by computing absolute error, as well as by creating a model of travel times differences between different grids. The optimal results were obtained using data with a mesh of 1000 m. The accuracy was as good as in a mesh of 500 m, but the travel time procured was much shorter.