Tile map storage method based on aggregation files

A technology of tile map and tile map, which is applied in the direction of file system, file/folder operation, geographic information database, etc., can solve the problems of large data volume tile map occupying a large amount of space, and the pressure of the main node is large, so as to reduce the The response time of the map, the effect of improving the indexing speed and reducing the storage space

Active Publication Date: 2014-04-23
SPACE STAR TECH CO LTD
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Problems solved by technology

[0004] The problem solved by the technology of the present invention is: A large amount of data tile map occupies a large amount of space in storage, time consumption caused by frequent I / O operations in retrieval, when using distributed file storage, the number of files is too large to cause the master node The problem of high pressure, the present invention mainly solves the problems in the above three aspects, and improves the map response performance of the network server

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  • Tile map storage method based on aggregation files
  • Tile map storage method based on aggregation files
  • Tile map storage method based on aggregation files

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[0071] Taking the map of China as an example, under the WGS84 coordinates, the geographic scope of my country extends to 73°40'00”E on the left, 135°2’30”E on the right, 53°33’30”N at the top, and 3°51’33” at the bottom N, under the WEB Mercator projection, the projected range is left (unit: meter) 8200906.89, right 15032806.67, upper 3077959.0, and lower 186754.6. According to the resolution of 96DPI, the implementation process of tile maps and aggregated files with scales of 1:4096, 1:16328, and 1:65536 is realized.

[0072] (1) Layer the nationwide map according to the tile pyramid model, and determine the scale of the 0th layer pyramid as 1:4096. Taking the 2nd and 4th layers as examples, calculate the number of tile maps in each layer and the number of tiles in each layer. The number of tilemap groupings within the layer aggregation file.

[0073] (1.1) Calculate the actual distance of each layer map

[0074] Length Y=Ymax-Ymin=3077959.0-186754.6=2891204.4;

[0075] wid...

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Abstract

A tile map storage method based on aggregation files includes the steps that (1) a measuring scale of the bottommost map is determined and a map to be stored is layered on the basis of the measuring scale; (2) at least one layer is selected from the 0th layer and the middle layer as an analysis object, the total number of obtained tile images in the map on each layer is calculated, and a measuring scale of the selected layer is determined according to the measuring scale of the bottommost layer; (3) the selected tile images in the map of each layer are grouped in sequence, and each group of the tile images generates one aggregation file; (4) a folder is built for the map of each layer, all aggregation files of the layer are stored in the folder, and the name of the folder can represent the number of layers of a pyramid; (5) the number of the layers selected in the step (2), the name of the folder built in the step (4), resolution corresponding to each layer, the geographic range of the map of each layer and the number of the aggregation files of each layer are stored in the XML format.

Description

technical field [0001] The present invention relates to a storage mechanism for cached maps in a network map server, and in particular to a tile map data organization method and storage method based on aggregation files. The use of the method can improve the indexing speed of network map data with a large amount of data. Thereby improving the efficiency of the network map server. Background technique [0002] Map tile technology is a map pre-caching technology. The map tile technology cuts the configured map with a certain coordinate range into square pictures in several rows and columns according to several fixed scales (tile levels) and specified picture sizes, and stores them in the In the directory system or database system, a static map cache of the pyramid model is formed, and the map slices obtained by cutting the map are also called tiles. Map tile technology has been widely used in WebGIS and map services. [0003] The advantage of a tile map is that it caches da...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
CPCG06F16/16G06F16/29
Inventor 李亚平石郡儒唐宜彬郭学武
Owner SPACE STAR TECH CO LTD
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