Electrodeless zoom display method of tile map

A tile map and zoom display technology, applied in the field of image processing, can solve problems such as cross display efficiency, increased computing and storage overhead, and tile map levels that cannot meet the display requirements, so as to avoid loading, reduce computing overhead, and improve display The effect of efficiency and experience effect

Active Publication Date: 2020-03-06
CHENGDU ZHONGKE HEXUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the limitation of the tile map level, the display range of this method changes too much after some adjacent map levels are switched, and the existing tile map level cannot meet the display requirements.
Re-dividing the level of the tile map to meet the needs of the display range will bring greater pressure on the performance and memory of the virtual application, increase computing and storage overhead, and increase the display efficiency.

Method used

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  • Electrodeless zoom display method of tile map
  • Electrodeless zoom display method of tile map
  • Electrodeless zoom display method of tile map

Examples

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Embodiment Construction

[0039] 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.

[0040] It should be noted that the tiles in the original tile map are spliced ​​into a complete tile map according to certain rules, and the tile map is enlarged (see Baidu map, Tencent map and other electronic map network clients, the motor zoom button That is, the "+" button, it can be known that the enlarged map in the field of electronic map technology indicates that the geographical range displayed in the same electronic map di...

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Abstract

The invention provides a stepless zoom display method of a tile map. The method comprises the following steps: S1, setting the actual pixel size of a single tile of each level of an original tile mapand the longitude and latitude range of a tile area needing to be displayed; initializing a tile level FZ needing to be displayed; S2, obtaining a hierarchy Z of an original tile map closest to a tilehierarchy FZ needing to be displayed; S3, calculating the size of a single tile pixel of the tile level FZ according to the distance between the nearest level Z of the original tile map and the tilelevel FZ; S4, tiles in the longitude and latitude range of the tile area needing to be displayed on the tile hierarchy FZ are spliced and cut out. According to the method, local stepless zooming is carried out between the nearest adjacent tile map hierarchy for the hierarchy needing to be displayed to refine the map stretching and zooming levels, loading of redundant full-original tile maps is avoided, and the display efficiency and experience effect of the virtual map are improved.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method for infinitely zooming and displaying a tile map. Background technique [0002] The tiled map is stored on the server side by a pre-generated method, and then according to the different requests submitted by the user, the map tiles within the corresponding display range are sent to the client. It is a multi-resolution hierarchical model, from the bottom to the top of the tile pyramid, the resolution is lower and lower, but the geographical extent of the representation remains the same. First, determine the number z of zoom levels to be provided by the map service platform, and use the map image with the highest zoom level and the largest map scale as the bottom layer of the pyramid, that is, layer 0, and divide it into blocks, starting from the upper left corner of the map image, Cut from left to right and from top to bottom, and divide into square map ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/0484G06T3/40
CPCG06F3/04845G06F2203/04806G06T3/4023
Inventor 郭滨
Owner CHENGDU ZHONGKE HEXUN TECH CO LTD
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