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5 Driving Range Polygon One of the goals this thesis is to draw driving range in the map as a polygon. This goal was chosen because today’s vehicle market provides, in most cases, only a circle to show driving range. This radius does not provide an accurate solution. It is computed as great-circle distance and it does not account for the diversity of the roads, so by using the help of the Google APIs there could be obtained a more accurate solution. The first thing need to be obtained is the current location using the satellite navigation and using Network. There will be described how to obtain this location in Android application and how to draw it in the Google Map. There will be explained a couple of approaches how to get a distance between two geo- graphical points in this chapter. Due to the Google API limitation mentioned in chapter 4, I was forced to get distances by another way. For this purpose, there will be described a great-circle [Rodrigue] and Haversine formula [Rick, 1999] approach. There will be de- scribed also World Geodetic System 1984 known as WGS84 [Verheijen, 2016] to get the more accurate distance in computation. After this assumption mentioned above there will be described an algorithm’s approach how to solve driving range polygon problem. At the end of this chapter, there will be summarized API limitation in the designed algorithm. 5.1 Satellite Navigation Satellite navigation is a system that allows us to get the current location, given by the receiver, in our case Android tablet. From satellite navigation, there could be obtained longitude, latitude and elevation level with an accuracy of meters. There could be obtained the current local time with high precision as well. The signals from the satellite are ob- tainable anytime and anywhere on the earth. There is only one requirement for obtaining the location. The device must be placed outdoors to obtain a position. It can take a while to get the location fix. If an internet connection is available, there is the ability to obtain location much faster using Assisted GPS which improves TTFF. The position can be obtained from the Network provider as well. This provider determines location based on WiFi access points and cell tower with lower accuracy compared with satellite location. The TTFF is much faster in this case. In summary, there are used both providers to get the device’s location. If the location cannot be obtained from the satellite then it is taken coarse location from the Network 10PDF Image | Driving Range Estimation and Trajectory Planning
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