Research On Application Of LBS Based On Android

With the rapid development of the Internet and communications technology, as well as the widespread of cellphones and PDAs, the demand for new service markets has become higher and higher. All these have caused LBS settled down as a new mobile service sector with the greatest potential for growth. Nowadays LBS is closely related to our daily life. It is widely applied in lots of domains. For example, logistics control, navigation and telematics. What's more, LBS can also be seen in the field of public safety, such as police patrol, firefighting and so on. At this time, quickly and precisely obtaining the location becomes quite important.etc.an accident occurred somewhere, if the service center cannot locate the point at once, one or two minutes may cause more casualties and damages. Time is life. The mainstream positioning methods are GNSS positioning and base station positioning. GNSS is more precise but responses slowly. Base station positioning is fast, however, less precise than the previous one. That is why some other positioning method appears. Such as A-GPS and GPSOne and so on. Their essences are all satellite positioning. Just combining wireless network and other technologies to assist GPS to locate. Different method has different characteristics and applications.LBS (Location Based Service)is a kind of value-added service, which obtains the longitude and latitude of the end-user through satellite and wireless network, after that, with the support of the electronic map, provide the location-based service for users. Broadly speaking, a service is classified as LBS as long as it is related to location. For Example, if you want to find out the restaurants nearby, or inquiring the weather of your city, all these deeds belong to the category of LBS. LBS is a tool, and it is not qualified for being a complete commercial model. Only to establish a link with businesses, and bring different experience from the old ones to customers, can capture users'heart and acquire grater space for development. The core of LBS is service, location is just a qualifications. In recent years, as scenarios become increasingly complex, indoor navigation and location privacy has drawn people's attention. These technologies all deserve our research and investigation.This essay discusses the architecture of LBS and techniques to realize LBS in GIS at first, analyzing map matching, electronic map, then introducing the key techniques those are used in police patrol system in detail, which is based on grid management. Realizations of the function modules are also included. Problems exist in the traditional police patrol, such as location of the police cannot be known in time, the low efficiency, and the error-prone. In addition, this system also use many multimedia means such as camera and recorder. Map browsing, locating polices, display of all policies' real time location, rapidly reporting of cases. All these are all achieved. Finally, it is the summary and outlook of all the research.