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
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[0017] figure 1 It is the tile package file structure diagram. Each tile package file stores the tile data of this level, and the number of storage is fixed. In practical applications, it is packaged according to the size of a single tile in 512*512. The size of each tile file is 256KB as a benchmark, and it is packaged once. The size of the final tile package file is within the range of [0GB, 64GB+3MB], and the size of the multi-packed tile package file is within the range that the file system can support. In the specific implementation, the packaging rule of 512*512 is used as an example to illustrate. The conversion rules of Row and Column before and after packaging are shown in the following table:
[0018]
[0019] The number of tile files can be effectively reduced by packaging. The tile package structure is divided into an index area and a data area. The index area records the data offset of the tile corresponding to its physical location with a fixed length of 8*5...
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