Client terminal and server terminal of navigation system, and map updating method

Abstract

The invention discloses a client terminal and a service terminal of a navigation system as well as a method for updating a map thereof; wherein, the method for the client terminal to ask for map updating to the service terminal includes: the client thermal obtains the current area needing to be updated and transmits the updating request of an appointed area to the service terminal as well as the version information which can reflect the current updating state of the required area; the client terminal receives the data returned by the service terminal and analyzes the data to obtain the map factor data of the corresponding area which is updated in the service terminal, and updates the map data and version information of the corresponding area in the client terminal according to the map data factor. As the client terminal of the invention transmits the updating request and the version information of the appointed area to the appointed area, the service terminal only transmits the updated information which is confirmed according to the version information in the appointed area to the client terminal and updates the map data of the client terminal according to the information after being resolved by the client, the updating process is simpler and the updating speed is improved.

Description

technical field [0001] The present invention relates to the field of GPS navigation, and more specifically, relates to a navigation system client, a server, and a method for the navigation system client to request a map update from the server, and the corresponding navigation system server to respond to the update of the client The requested method. Background technique [0002] At present, the global positioning system (Global Positioning System, GPS) for vehicles is one of the important application directions of GPS navigation. The GPS antenna of the car GPS navigation system receives the data information transmitted by at least 3 of the 24 GPS satellites around the earth, combined with the electronic map stored in the car navigation terminal, the position coordinates determined by the GPS satellite signal and this match to determine the exact position of the navigation object in the electronic map. [0003] figure 1 Shows the structural composition of the existing navi...

AI Technical Summary

Problems solved by technology

However, because the granularity of each map element is too small, and usually the number of map elements that need to be changed is too large, this makes it necessary to repeatedly communicate with the server in order to determine the map elements when actually performing an update, and update the required network. Compared with the network traffic and time required to determine the update range, the traffic and time spent are almost the same. A lot of time is spent on determining the map elements that need to be updated, resulting in a waste of network resources.

[0029] In the common navigation electronic map data structure, the map element ID will be subdivided into each POI information point, road, link and other information, then, first download the map elements such as points of interest, roads, and links from the server to reflect The update status information of the update status of the map data on the server is sent to the client to determine which map elements the client needs to request for update, and then further perform the actual update operation of each map element. Since the number of map elements is large, this The process of downloading the update status information of the server-side map and determining the map elements to be updated will be very time-consuming

In addition, since the update status information of small-grained map elements needs to be downloaded to the local, for comparison, and then ask the server for the updated map elements, in this way, after downloading the update information of the map element ID on the server to the local, The map elements on the server side may have new updates, which may cause the problem that the update information downloaded locally is not synchronized with the update information on the server side. It is necessary to keep the update information of the map elements on the server side and the map element ID downloaded by the client completely. Synchronization, the development technology required for it is extremely complex, the key robustness of the application becomes fragile, and the update process is more complicated

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