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Device and method for calculating tiles in electronic map visual area

An intra-area, map technology, applied in the direction of multi-program installation, program startup/switching, etc., can solve the problems of poor tile accuracy and operation speed, large server processing capacity, etc. good effect

Active Publication Date: 2014-04-02
BEIJING QIHOO TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method for the client to request the tiles in the visible area of ​​the electronic map is to send a download tile request to the server by using the pixel coordinates, and the server gets the tiles according to the pixel coordinates and returns the tiles to the client. However, this method , not only the processing capacity of the server is large, but also the accuracy and operation speed of the tile acquisition operation are not good

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  • Device and method for calculating tiles in electronic map visual area
  • Device and method for calculating tiles in electronic map visual area
  • Device and method for calculating tiles in electronic map visual area

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Embodiment Construction

[0029] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0030] It should be noted that the electronic map tiles are the pictures in the grid map. These pictures are spliced ​​into a complete electronic map according to certain rules, and the electronic map is enlarged (see Baidu map, Tencent map and other electronic map network clients, Click the zoom-in button, which is the "+" button, it can be seen that in the field of electronic map technology, zooming in on the map means that the ge...

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Abstract

The invention discloses a device and a method for calculating tiles in an electronic map visual area. The method includes: converting to obtain the pixel coordinates of a central point according the geographic position coordinates of the central point of the map visual area and the current map display level; obtaining the pixel size of a signal tile at the current display level according to the current map display level; obtaining the pixel coordinates of two opposite peaks of the map visual area according to the pixel size of the map visual area and the pixel coordinates of the central point; obtaining the number of the tile in the visual area according to the pixel coordinates of the two opposite peaks of the map visual area and the pixel size of the signal tile at the current display level. The method has the advantages that the number of the tile in the visual area is obtained by calculation according to the geographic position coordinates and the display level, the number of the tile in the visual area can be calculated accurately, and the problem that tile acquisition is poor in accuracy and speed is solved.

Description

technical field [0001] The invention relates to the technical field of electronic maps, in particular to a device for calculating tiles in a visible area of ​​an electronic map and a method for calculating tiles in a visible area of ​​an electronic map. Background technique [0002] In the current application of electronic maps, the specific storage form of storing tiles by the server is to store the tiles with pixel coordinates as indexes. The method for the client to request the tiles in the visible area of ​​the electronic map is to send a download tile request to the server by using the pixel coordinates, and the server gets the tiles according to the pixel coordinates and returns the tiles to the client. However, this method , not only the processing capacity of the server is large, but also the accuracy and operation speed of the tile acquisition operation are not good. Contents of the invention [0003] In view of the above problems, the present invention is propos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/48
Inventor 杨新明
Owner BEIJING QIHOO TECH CO LTD