With the increased use of GPS sensors in several everyday devices, persons trip data are be- coming very abundant. Many opportunities for exploration of the wealth GPS data and in this paper, we inferred, the geometry of road maps in Tunisia and the connectivity between them. This phenomenon is known as map generation and also map inference procedure. For that, we gathered big GPS data from about ten thousands of vehicles equipped with GPS receivers and circulating in Tunisia, which does not have a road map like other developing countries. We collected a big database with approximately 100 gigabytes. After preprocessing it, we were obliged to partition data in order to facilitate handling an unstructured database with a such size. In fact, we used for that K-means with its sequential mode and the parallel mode based on Mapreduce, which is one of the most famous proposed solution to analyse the rapidly growing data. The proposed parallel k-means algorithm was tested with our GPS data and the results are efficient in processing large datasets. It is a parallel data processing tool which is gathering significant importance from industry and academia especially with appearance of a new term to describe massive datasets having large-volume, high-complexity and growing data from different sources, “big data”.
