ABSTRACT
Mobile devices are widely used nowadays, and their popularity is spreading. Communication, applications, functionalities, and challenges of these devices are increasing every year. Users deal with mobile devices to do many activities under many circumstances. Geographic information systems (GIS) are information system that handle, manage, and examine spatial data. GIS are used to create information that is important for decision-making purposes, traditionally in the natural resource controlling area, but increasingly for health, marketing, and other fields. Coordinate systems are location-based reference systems for spatial data on the Earth. Whereas GIS work with geospatial information, the coordinate system acts as the main key in the projects of GIS. Users recorded their trips by mobile devices. Each track may represent a movement within a day or less than a day. Tracks are read repeatedly by scanning all track files for all users to create a data structure that represents all user histories.
