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Spatial-keyword query method and system based on spatial distance constraints

A technology of spatial distance and query method, which is applied in the field of information query, can solve the problems of low query and update efficiency and high tree maintenance time, and achieve the effect of improving efficiency and reducing maintenance time

Active Publication Date: 2018-09-18
SHIJIAZHUANG TIEDAO UNIV
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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a spatial keyword query method and system based on spatial distance constraints, to solve the problem that the existing spatial keyword query method has low efficiency of query and update when the amount of data is large. Problems with high maintenance time for the tree

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  • Spatial-keyword query method and system based on spatial distance constraints
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  • Spatial-keyword query method and system based on spatial distance constraints

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Embodiment Construction

[0030] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0031] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude one or more other features. , whole, step, operation, element, component and / or the presence or addition of a collection thereof.

[0032] It shou...

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Abstract

The invention discloses a spatial-keyword query method and system based on spatial distance constraints. The method and system are suitable for use in the field of information query technology. The method includes: acquiring spatial keywords, the spatial distance constraints and a target number input by a user, wherein the spatial keywords include a to-be-queried geographic location and a to-be-queried text keyword set; acquiring a set of spatial text objects in a preset spatial range, wherein the spatial text objects include geographic locations and a text keyword set; dividing the spatial range into grids according to a preset rule, and carrying out coding for each grid; establishing an inverted table for the set of the spatial text objects according to the text keywords, and establishing an aggregate linear quadtree for each text keyword; and obtaining a query result set according to the to-be-queried geographic location, the to-be-queried text keyword set, the spatial distance constraints, the grids, corresponding codes of the grids, the inverted table and the target number. According to the method, query and updating efficiency can be effectively improved, and maintenance timefor the tree can be reduced.

Description

technical field [0001] The invention belongs to the technical field of information query, and in particular relates to a spatial keyword query method and system based on spatial distance constraints. Background technique [0002] With the widespread popularity of smart phones and mobile terminals, more and more applications have shown the integration of geographic location information and text information. On the one hand, more and more places, such as shops, restaurants, playgrounds, etc., have added text description information related to geographical location; on the other hand, text information is also associated with geographic information through features such as place names and street addresses. . Research shows that about one-fifth of Internet searches are related to geographic location, including place names, zip codes, etc. Spatial text query (referred to as spatial keyword query) on objects containing both spatial and textual information has become one of the ho...

Claims

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Application Information

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IPC IPC(8): G06F17/30
Inventor 潘晓吴雷
Owner SHIJIAZHUANG TIEDAO UNIV
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