Storage method for map tile file

A map tile, tile technology, applied in geographic information databases, special data processing applications, instruments, etc., can solve problems such as increasing the number of small files

Active Publication Date: 2015-12-02
SUZHOU ZHONGKE IMAGE SKY REMOTE SENSING TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the number of index files and aggregation files is equa

Method used

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  • Storage method for map tile file
  • Storage method for map tile file
  • Storage method for map tile file

Examples

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Example Embodiment

[0017] figure 1 It is the file structure diagram of the tile package. Each tile package file stores the tile data of the level, and the number of storage is fixed. In actual applications, it is packaged in 512*512 according to the size of a single tile, and the size of each tile file is 256KB as a benchmark. The file size of the post-tile package is within the range of [0GB, 64GB+3MB], and the file size of the multiple-packed tile package is within the range supported by the file system. In the specific implementation manner, the packing rule of 512*512 is taken as an example for description. The conversion rule of Row and Column before and after packing is shown in the following table:

[0018]

[0019] Packing can effectively reduce the number of tile files. The tile packet structure is divided into an index area and a data area. The index area uses a fixed length of 8*512*512 bytes to record the data offset of its physical location corresponding to the tile. The data area p...

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Abstract

The invention discloses a storage method for a map tile file. The method comprises the following steps: (1) for each layer, packaging tile data according to a fixed structure and quantity to form tile package files, wherein each tile package file comprises an index area with fixed length and an arbitrarily extendable data area, the index area records offset positions of the tile data according to a [Row, Column] sequence of the tile data, and the tile data in the corresponding [Row, Column] is stored in the offset positions recorded by indexes. For the situations of rapid increase in number of tiles generated when a measuring scale is enlarged, increment in storage space, frequent I/O operation of a disk, high time complexity and excessively high main node management pressure, the storage method for the map tile file can reduce storage space, improve retrieval efficiency, facilitate migration of lots of small files, effectively improve copy and deletion efficiency of the map tile data, and provide packaging, updating and reading operations of the tile data.

Description

technical field [0001] The invention relates to a method for storing tile data in a Web map service; it aims to pack massive tile data into a large-space tile package file for management and reading, and specifically relates to the insertion of map tile data into a tile package file , updating and reading operations; the present invention is applicable to the cache organization and management of the tile data of the server and the client in the Web map service. 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 ...

Claims

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Application Information

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IPC IPC(8): G06F17/30
CPCG06F16/29
Inventor 胡晓东骆剑承黄方红张章史志明吴春苗袁烨诚王博夏列钢雷一鸣黄启厅杨明宁凯李成丁青
Owner SUZHOU ZHONGKE IMAGE SKY REMOTE SENSING TECH CO LTD
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