Electronic map spatial query method and system

Abstract

The present invention discloses an electronic map spatial query method. The electronic map spatial query method is applied to an electronic map spatial query system comprising a client and a server. The method comprises: a client receiving to-be-queried POIs input by a user, and obtaining a query aera selected by the user in an electronic map; the client building up a quadtree corresponding to the query area by decomposing the query area, and determining whether each decomposed quadtree mesh grid is within an index value in the corresponding level of the quadtree; the server querying POI coordinate information of all the to-be-queried POIs in the quadtree mesh grids corresponding to the index value in a database, and sending the POI coordinate information to the client; and the client displaying the corresponding to-be-queried POIs in the query area according to the received POI coordinate information.

Description

technical field [0001] The invention relates to the technical field of electronic maps, in particular to an electronic map space query method and system. Background technique [0002] An electronic map is a digital map, which is a map that is stored and consulted digitally using computer technology. Electronic maps are stored on media such as computer hard disks, floppy disks, CDs, or magnetic tapes. The content of the map is represented by numbers, and these numbers need to be displayed, read, retrieved, and analyzed by special computer software. The method of storing information in electronic maps generally uses vector image storage. The scale of the map can be enlarged, reduced or rotated without affecting the display effect. In the early days, bitmap storage was used, and the scale of the map cannot be enlarged or reduced. Modern electronic map software generally uses geographical information systems to store and transmit map data, and other information systems. The am...

AI Technical Summary

Problems solved by technology

However, the existing spatial query method only supports the query of the surrounding range of a certain point, that is, the query of the circular area. This query method has many inconveniences. It is a polygon, and the circular area query cannot satisfy the query of restaurants in the second ring road

It can be seen that the existing spatial query technology only supports circular area query and does not support other graphic queries, which causes inconvenience to users for spatial query

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