Road network shape point data loading method and device, and navigation method and device
A loading device and shape point technology, applied in the navigation field, can solve problems such as large amount of calculation, affecting user navigation experience, and heavy load of the navigation system, so as to speed up the loading speed and improve the performance of loading and use
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[0047] Example one
[0048] In this embodiment, the loading of shape point data of the navigation path in the car navigation system is taken as an example for description. The electronic map is specifically a navigation electronic map, and the displayed path is specifically a navigation path obtained after path calculation based on a navigation request. . In other embodiments, the electronic map may also be map software provided by other terminal devices, such as map software running in terminal devices such as mobile phones, computers, handheld multimedia players, etc., and it may not necessarily be based on navigation requirements. It only queries the path from one location to another, and displays the path on the display screen of the terminal device.
[0049] When a user needs a navigation service, by triggering a navigation request, after receiving the navigation request, the car navigation system performs path calculation based on the navigation request (including the inform...
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[0074] Example two
[0075] In the first embodiment, according to the different display scales of the electronic map, the corresponding road network shape point data is extracted to improve the performance of loading and using the shape point data. However, since the path is displayed on the electronic map, in order to see clearly For the details of a local road section or to understand the location of the path in a large range, the display scale needs to be adjusted. At this time, it is necessary to extract the shape points of the displayed path according to the adjusted display scale, and then load the analysis The shape point data corresponding to the shape point obtained later requires a certain amount of calculation time due to the extraction process, which will cause a delay when the user switches the display scale, which affects the user experience. For this reason, the inventor considers that when the displayed path is obtained, the shape points of the displayed path can ...
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