A real-time slicing and updating method for vector tiles based on multi-layer cache

Abstract

The invention discloses a method for real-time slicing and updating of vector tiles based on multi-layer cache, comprising the steps of: searching in a spatial database according to the input map range, judging whether it involves data updating, and updating the complete geometric shape of the data Return the smallest outsourcing rectangle and generate corresponding vector tiles; establish a search identifier according to the request range for generating vector tiles, and use the search identifier to search the memory database. If it exists, return the search result; If it exists in the relational database, load it into the cache and return the search result; if none exists, call the vector tile slicing tool to generate vector tiles in real time, store the generated vector tiles in the memory database or non-relational database, and Build a document index and return vector tiles at the same time. It effectively improves the release efficiency of vector tile data, and meets the needs of users for real-time generation and update of massive data.

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