Vector tile real-time slicing and updating method based on multi-layer cache

Abstract

The invention discloses a vector tile real-time slicing and updating method based on multi-layer cache, which comprises the following steps of: retrieving in a spatial database according to an input map range, judging whether data updating is involved or not, and returning a complete geometrical shape of updated data to a minimum bounding rectangle to generate a corresponding vector tile; establishing a retrieval identifier according to the request range for generating the vector tiles, retrieving the memory database through the retrieval identifier, returning a retrieval result if the retrieval identifier exists, and retrieving the non-relational database if the retrieval identifier does not exist; if the search result exists in the non-relational database, loading the search result intoa cache and returning the search result; and if not, calling a vector tile slicing tool to generate vector tiles in real time, storing the generated vector tiles into a memory database or a non-relational database, establishing a file index, and returning the vector tiles. The publishing efficiency of the vector tile data is effectively improved, and the requirements of a user for instant generation and updating of mass data are met.

Description

technical field [0001] The invention relates to the technical field of digital maps, in particular to a method for real-time slicing and updating of vector tiles based on multi-layer cache. Background technique [0002] With the geometric progression of spatial measured data, and in the case of limited network bandwidth, it is a common practice for mainstream WebGIS platforms to use tile technology to realize online release of spatial data. This method is to pre-cut the remote sensing image and map vector data into fixed-size tiles by pre-slicing the image slice and vector slice. When the data is loaded, only the visible area is displayed by calculating the current browser view range The tiles in the domain range can greatly reduce the amount of data loading and improve the display efficiency of spatial data. However, in the existing technology, the tile efficiency of spatial data is greatly affected by the amount of data. When the amount of data reaches terabytes, the proc...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a real-time slicing and updating method for vector tiles based on multi-layer cache. In the storage and extraction of vector tiles, multiple Layer caching mechanism to solve the problems of low update efficiency, complex operation and inability to release real-time vector tiles with a large amount of data

Images