A method and device for accessing an electronic map
A technology of electronic map and access method, applied in the direction of electronic digital data processing, geographic information database, instrument, etc., can solve the problems of low accuracy of map access, affect monitoring application, and inability to realize map access, etc., so as to improve the accuracy Effect
Active Publication Date: 2018-11-13
ZHEJIANG UNIVIEW TECH CO LTD
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Problems solved by technology
The above processing involves the mutual conversion between pixel coordinates and latitude and longitude coordinates, which needs to be based on the conversion relationship between the two provided by the data provider. When the data provider cannot provide the conversion relationship due to data confidentiality, it is impossible to determine The scheduling rules of the tile map, that is, it is not known which tile map to transfer to the center of the monitoring platform, and the map access cannot be realized; even if the map access is realized through a certain method at present, the accuracy of the map access is relatively low. The latitude and longitude coordinate conversion corresponding to the pixel coordinates is inaccurate, which affects the monitoring application
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[0025] figure 1 An application scenario of an electronic map access method is illustrated, such as figure 1 As shown, the electronic address provided by the data provider should be Figure 11 When connected to the monitoring platform 12, the data provider may be a customer who needs the monitoring platform to provide monitoring services. For example, after the data provider connects its own electronic map to the monitoring platform, the preset latitude and longitude in the map accessed by the platform By setting surveillance cameras at the location, the data provider can visually check the spatial location of each camera and retrieve surveillance video through the platform.
[0026] The electronic map provided by the current data provider can be in the form of tiles, such as figure 1 As shown, the map is composed of multiple tile maps, such as tile map 13, tile map 14 and tile map 15, etc., which are tile maps in the form of boxes ( figure 1 Just for illustration), each til...
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The invention provides an electronic map accessing method and device. The method includes the steps that center pixel coordinates corresponding to center longitude and latitude coordinates are obtained according to the center longitude and latitude coordinates and a preset first conversion relation, tile maps corresponding to the center pixel coordinates are called, an accessed electronic map composed of the adjacent tile maps is displayed, and the first conversion relation is used for showing the conversion from the longitude and latitude coordinates to the pixel coordinates; longitude and latitude coordinates corresponding to the pixel coordinates are obtained according to all pixel coordinates in the electronic map and a preset second conversion relation, monitoring application is conducted according to the longitude and latitude coordinates, the second conversion relation is used for showing the conversion from the pixel coordinates to the longitude and latitude coordinates, and the first conversion relation and the second conversion relation are obtained through mathematical calculation according to the pixel point coordinates in the electronic map. The electronic map accessing precision is improved.
Description
technical field [0001] The invention relates to monitoring technology, in particular to an electronic map access method and device. Background technique [0002] At present, the development of network-based video surveillance technology enables a large number of video surveillance resources to be integrated, and the surveillance videos of each camera can be retrieved from the electronic map of the monitoring platform. At the same time, the application of the electronic map can make the spatial position of each camera intuitively displayed. . The realization of the monitoring platform based on the electronic map above needs to connect the electronic map provided by the data provider to the monitoring platform. [0003] At present, many electronic maps are provided in the form of tile maps. When connecting the electronic map to the platform, it is necessary to determine the pixel coordinates of the tile map corresponding to the longitude and latitude coordinates of the screen...
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IPC IPC(8): G06F17/30
CPCG06F16/29
Inventor 叶敏挺方国伟王秋丁立新徐炜洪婷婷
Owner ZHEJIANG UNIVIEW TECH CO LTD