Rapid caching method for network level map data

A technology of map data and hierarchy, applied in the field of fast caching of network-level map data, can solve the problems of large number, trivial acquisition of hierarchical map data files, time-consuming and laborious generation and reading, etc.
CN110427345AActive Publication Date: 2019-11-08武汉星源云意科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
武汉星源云意科技有限公司
Publication Date
2019-11-08

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Abstract

The invention discloses a rapid caching method for network level map data. The rapid caching method comprises the following steps: calculating the total number of cut images of map data of all layers,dividing the total number of cut images into a plurality of subtasks according to the number of CPU cores of a computer, and enabling each subtask to be in one-to-one correspondence with the CPU coreof each computer; and establishing an index code for each cut graph; setting the number of repeated bytes and the size of a sliding window, enabling a CPU core of a computer to read a corresponding cut image, traversing all rows of data of the cut image through the sliding window, and compressing repeated byte segments. According to the rapid caching method, the efficiency of generating and reading the hierarchical map data is improved by adopting a multi-thread cache compression method, a self-created cut map compression method and a decompression method.
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Description

technical field

[0001] The invention relates to the technical field of hierarchical maps and map compression, in particular to a fast caching method for network hierarchical map data. Background technique

[0002] With the rapid development of satellite positioning technology, Internet location service and other technologies, the demand for map data from all walks of life and the general public continues to grow, and hierarchical map data is indispensable as a background map. However, obtaining hierarchical map data files is trivial and the number is huge, and it takes time and effort to generate and read them. How to efficiently generate and read hierarchical map data has become a hot issue in map data processing. Contents of the invention

[0003] In order to solve the above problems in the prior art, the present invention provides a fast caching method for network-level map data.

[0004] To achieve the above object, the present invention takes the following technical...

Claims

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