Method for regulating map scale automatically and dynamically for mobile terminal

Abstract

The invention discloses a method for regulating a map scale automatically and dynamically for a mobile terminal, comprising the steps of: obtaining a geographic coordinate of the located position through a GPS (Global Positioning System) in the mobile terminal in real time, and transforming the geographic coordinate into a screen coordinate through projection transformation. If the transformed screen coordinate is within a map display range before the regulation of the mobile terminal, an amplification algorithm is adopted, and whereas a reduction algorithm is adopted, thereby figuring out an ideal map scale value desired by regulation. According to the ideal map scale value, a map of which the map scale value is most approximate to the ideal map scale value is checked in a network map service or a local map database, and the map display effect is adjusted. The method provided by the invention can regulate the map scale of a mobile terminal in a movement condition automatically and dynamically according to the real time position of the mobile terminal, thereby avoiding the inconvenience that a user regulates the map scale manually.

Description

technical field [0001] The invention relates to a method for automatically and dynamically adjusting the scale of a map by a mobile terminal, and belongs to the technical field of location services. Background technique [0002] The essence of the automatic and dynamic adjustment of the map scale by the mobile terminal is that the map scale in the mobile terminal automatically adjusts the display scale of the map on its screen as the mobile terminal changes its motion state, so as to achieve the goal of providing users with geographical information that meets their needs. Automatically and dynamically adjusting the map scale is one of the important applications of location-based service technology, and it is also one of the emerging applications of navigation technology, which is widely used in mobile terminal devices such as car navigators, smart phones, and PDAs. [0003] How the mobile terminal automatically and dynamically adjusts the map scale is a very practical proble...

AI Technical Summary

Problems solved by technology

At this stage, the existing methods cannot automatically and dynamically adjust the map scale to the size required by the user in real time and effectively, such as: the method of automatically and dynamically adjusting the map scale according to the speed, this method cannot obtain the user's speed in real time, and can only be approximated by the average speed Instantaneous speed can easily cause approximation errors; another example is the method of automatically and dynamically adjusting the map scale according to special points. This method selects the positions of special points such as intersections, traffic lights or corner points on the map. , the map scale is automatically adjusted, but when the user is between two specific points, the map scale cannot be adjusted, and it is difficult to achieve real-time performance

Due to the limitations of their own conditions, these methods cannot automatically adjust the map scale in real time and effectively, which brings a lot of inconvenience to practical applications.

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