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Geodata Sources in Mobile Devices

Keywords:

A.A. Golovkov – Post-graduate Student, Assistant, Department «Computer systems and networks»,  Bauman Moscow State Technical University
E-mail: aagolovkov@bmstu.ru


One of the promising IT directions is the development of monitoring complexes for mobile employees based on geoinformation systems (GIS). Such complexes are most in demand in the fields of automation of transport logistics, maintenance and repair of equipment (MRO) to reduce costs, increase customer loyalty, reduce planning time, increase labor productivity, etc. The integration of these solutions has made it possible to expand the capabilities of employees, usually working outside the office. The key features of GIS are the automatic formation of optimal routes considering various criteria, for example, minimizing transport costs and unplanned downtime. The practical implementation of the complexes is closely connected with the collection, processing, storage and visualization of geolocation data obtaining from mobile devices, which in general is a complex technical task.
Within the development of GIS, engineers are faced with the need to obtain correct geo-coordinates from raw information received from different sources. The high-quality requirements for the mobile applications oblige us to use all available processing capabilities, combine a low-level and high-level API (Application Programming Interface) of various data sources. The challenge is complicated by the need for typing, unifying and comparing geodata. It should also be noted that proprietary mobile operating systems, in which the internal implementation of processing is completely closed from the developer, make it significantly hard to study the specifics of the domain.
In the paper, we consider main and additional geo-data sources used in mobile devices, features of their operation, specificity of usage and data format. A comparative analysis of geo-data sources is performed, the most prioritized sources for utilize are determined. The analysis of the tracks constructed in real time by geo-coordinates obtained from moving mobile devices is performed, the causes and nature of the deviations of tracks from real routes are revealed:
coordinates with low accuracy when navigating inside buildings, due to re-reflections, refractions and attenuations of radio signals in-doors;
«wandering» coordinates at zero speed;
deviation of the track near high-rise buildings;
delay of geo-coordinates;
random deviations of coordinates from all sources of geodata, due to internal processing errors and various external factors affecting the system.
As a result, we determine the ratios for bringing diverse data from different sources to a single form. This allows us to synthesize a geolocation data model, by use of which further processing of geo-coordinates could be simplified in order to obtain tracks of movement of mobile devices with a high degree of accuracy.

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