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A method for downloading offline maps based on tile technology

A technology of offline maps and tiles, applied in geographic information databases, data processing input/output processes, instruments, etc., can solve problems such as lack of science and waste of resources, and reduce downloads, traffic resources and storage space resources The effect of saving and saving terminal storage space

Active Publication Date: 2019-05-21
SHENZHEN 2BULU INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To sum up, the purpose of the present invention is to solve the problem of lack of scientificity and waste of resources in the current offline map download method of tile maps, and propose a method for downloading offline maps based on tile technology

Method used

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  • A method for downloading offline maps based on tile technology
  • A method for downloading offline maps based on tile technology

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Embodiment Construction

[0019] The method of the present invention will be further described below in conjunction with the accompanying drawings and preferred specific embodiments of the present invention.

[0020] refer to figure 1 As shown in , the existing tile map is a pyramid model structure, and the number of tiles at each level is 2 2n , the level index n starts counting from 0, the 0th level is 1 tile, which can usually be regarded as the root node, the 1st level is 4 tiles, the 2nd level is 16 tiles...and so on. This can just be used to describe a regular division of map scale and display resolution. At level 0, it is assumed that a tile can see the map of the entire area. At level 1, each picture can only display a map of 1 / 4 of the area. At level 2, only 1 A map of the / 16 area. From the top layer to the bottom layer of the pyramid, the scale of the map display is getting larger and higher, and the resolution is getting higher and higher, but the total map range represented by all the t...

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Abstract

An offline map downloading method based on the tile map technology relates to the field of mobile phone maps and comprises the following steps: (1) obtaining a circumscribing rectangle entirely including track routes to be used by a going-out user; (2) expanding the circumscribing rectangle according to the specified peripheral range to form a target rectangle; (3) sequentially judging whether tiles in the target rectangular area is within the peripheral specified range of the track routes, making the request of downloading the tiles within the peripheral specified range to a server, and caching all the successfully downloaded tiles in the local terminal for later offline use. According to the method for downloading map tiles according to the trip route, only the map tiles within the specified range (distance) around the trip route, instead of unnecessary map tiles, are downloaded, so that the downloads are reduced, the downloading flow and the terminal memory space are saved, and accordingly, the benefit of saving both flow resources and memory space resources is achieved.

Description

technical field [0001] The present invention relates to the field of mobile phone maps, in particular to a mobile phone map based on a WebGIS (Network Geographic Information System) architecture built in the form of tiled maps, and more specifically relates to a method for downloading offline maps based on tiled technology. Background technique [0002] At present, many mobile phone maps are based on tile maps, especially for satellite maps that are convenient for outdoor travel, tile maps must be used. The principle of this type of map is to set the map to multiple scales. For each scale, the map is divided into several small slices in advance and stored on the server. When the terminal requests, it directly obtains the required small pictures and stitches them into a map instead of by The server temporarily generates a map as needed and transmits it to the terminal, which greatly reduces the server's access to geographic data and improves the access speed. At the same tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F16/29G06F16/9538G06F16/957G06F3/0484
CPCG06F3/0484G06F16/29G06F16/9537G06F16/9574
Inventor 曾胜群郝英华罗亮富陈士强
Owner SHENZHEN 2BULU INFORMATION TECH CO LTD