Cutting method for map vector data in mobile phone network navigation
A vector data and cutting method technology, which is applied in the field of map vector data cutting in mobile network navigation, can solve the problems of increasing map server processing efficiency, large data flow, and complicated program algorithms, so as to improve the speed of drawing and the efficiency of transmission speed, effect of reduced traffic
Active Publication Date: 2012-06-13
XIAMEN YAXON NETWORKS CO LTD
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Among them, the static cutting is to pre-cut the map into a fixed size and a variety of specifications according to the fixed scale size and the size of the mobile phone screen. When the user requests, the corresponding data is directly transferred to the terminal for display. The advantage is that the implementation of the program algorithm is relatively simple, and the map server has high efficiency in processing the display data. The disadvantage is that the data flow generated during the transmission of the display data is large; the dynamic cutting is based on the needs of mobile phone users, and the dynamic cutting meets the needs of users. The map vector data is sent to the mobile terminal for display. The advantage is that the data flow is reduced during the data transmission process. The disadvantage is that the program algorithm is more complicated, which slightly increases the processing efficiency of the map server.
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[0021] A specific example of the map vector data cutting method in a kind of mobile phone network navigation of the present invention, comprises the following steps:
[0022] 1) National map grid division
[0023] The rectangular range of the national map area is that the horizontal coordinates range from 73.381041° to 135.129819°, and the vertical coordinates range from 18.080491° to 53.584553°. —GB / T 13989-92", select the framing standard of 1:100,000 (longitude difference 7′30″, latitude difference 5′), and divide the nationwide rectangular area into 426 行 ×496 列 Each map frame is equal in size, and these map frames are numbered in a "top-to-bottom, left-to-right" manner.
[0024] 2) Map vector data storage method
[0025] Read the vector data of each city in the country according to the principle of framing and numbering, and store them in the memory, and store the vector data of each data type in each city in the country in accordance with the order of the map frame n...
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The invention relates to a cutting method for the vector data of mobile phone network navigation map, comprising: dividing a national map into a plurality of map sheets of same area, using the map sheets as units to store the vector data of the national map; determining a map region needed to be cut; calculating all grids covered by the cutting region and storing each grid number; determining thedata type displayed in the prior region and the displayed object level of each data type; selecting actual map display objects in the determined region, judging if the display objects are crossed with region boundary, if they are crossed, processing object cutting. The invention can transmit map data after obtaining the request message of mobile phone terminal and satisfying the map display requirements of mobile phone terminal, to reduce the transmission of unnecessary map data, thereby reducing data transmission flux in wireless network, improving transmission speed, and improving map plotting speed on the screen of terminals.
Description
technical field [0001] The invention relates to a method for cutting map vector data in mobile phone network navigation. technical background [0002] Mobile phone GPS navigation systems are now basically divided into two types: mobile phone autonomous navigation systems and mobile phone network navigation systems. In the mobile phone network navigation system, since the operator's charge is associated with the transmitted data flow, the flow control of the map vector data transmission is a difficult point. [0003] The cutting of map vector data is divided into static and dynamic cutting. Among them, the static cutting is to pre-cut the map into a fixed size and a variety of specifications according to the fixed scale size and the size of the mobile phone screen. When the user requests, the corresponding data is directly transferred to the terminal for display. The advantage is that the implementation of the program algorithm is relatively simple, and the map server has ...
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IPC IPC(8): G01C21/00G01C21/26
Inventor 陈青溪陈从华时宜许宁季刚
Owner XIAMEN YAXON NETWORKS CO LTD