CN111427983A - Service method, system, device and storage medium based on geographic information retrieval - Google Patents
Service method, system, device and storage medium based on geographic information retrieval Download PDFInfo
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- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
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Abstract
The invention provides a service method, a system, equipment and a storage medium based on geographic information retrieval, wherein the method comprises the following steps: acquiring user information, wherein the user information comprises user identification information and user geographic information; determining a first CellID of the position where the user is located through a Google S2 algorithm according to the geographic information of the user; searching a plurality of first target geographic interest points of which the geographic fence information covers the first CellID; and determining whether to trigger a callback event according to the user identification information and the service configuration rule of each first target geographical interest point. The service method of the invention improves the speed of user retrieval or geographic interest point retrieval service by establishing the CellID prestorage of each geographic interest point and corresponding geographic interest point, and enables a large number of callback functions to be possible, thereby supporting the rapid online geographic correlation function of an OTA related production line.
Description
Technical Field
The invention relates to the technical field of information search of electronic maps, in particular to a service method, a system, equipment and a storage medium for accurate and efficient geographic information retrieval based on Google S2.
Background
The existing geographic position algorithm is based on map projection, is a simple function of mapping points on the earth surface onto a plane map, and has larger scale distortion at high latitude. And the Googles2 improves the data processing precision through spherical projection and solves the problem of processing the fence data of irregular polygons.
Services based on geographic information retrieval in Online Travel services (OTA) are an important conventional service. The existing conventional service architecture places all Point of interest (POI) Information into a database, and when the POI data is more, the retrieval speed is slow. How to greatly increase the retrieval speed, so that the service is suitable for large-batch POI retrieval scenes, and can combine various OTA service scenes to add a callback function to support the rapid development of large-scale OTA services is a problem to be solved urgently.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a service method, a system, equipment and a storage medium based on geographic information retrieval.
The embodiment of the invention provides a service method based on geographic information retrieval, which comprises the following steps:
acquiring user information, wherein the user information comprises user identification information and user geographic information;
determining a first CellID of the position where the user is located through a Google S2 algorithm according to the geographic information of the user;
searching a plurality of first target geographic interest points of which the geographic fence information covers the first CellID;
and determining whether to trigger a callback event according to the user identification information and the service configuration rule of each first target geographical interest point.
According to an example of the present invention, the finding geo-fence information covers a plurality of first target geo-interest points of the first CellID, comprising the steps of:
searching a mapping relation table of each pre-established geographic interest point and the corresponding second CellID;
comparing the first CellID of the position where the user is located with the second CellID corresponding to each geographic interest point;
and if the first CellID is matched with a second CellID corresponding to the geographic interest point, the geographic interest point is considered as a first target geographic interest point.
According to an example of the present invention, the mapping relation table is established by the following method:
receiving service requests of a plurality of geographic interest point management systems, wherein the service requests comprise geographic fence information and service configuration rules corresponding to the geographic interest points, and the geographic fence information comprises position information and distance thresholds of the corresponding geographic interest points;
determining a second CellID corresponding to each geographical interest point through a Google S2 algorithm according to the position information and the distance threshold of each geographical interest point;
and establishing a mapping relation table of each geographic interest point and the corresponding second CellID.
According to an example of the present invention, the business configuration rule of the geographic interest point includes one or more of a business type of the geographic interest point, a user requirement and an instruction content of a required callback.
According to an example of the present invention, the service type of the geographic interest point includes a geographic interest point corresponding to a specific user and a geographic interest point corresponding to a non-specific user;
and if the service type of the geographic interest point corresponds to a specific user, the service configuration rule further comprises a specific user list.
According to an example of the present invention, the determining whether to trigger a callback according to the user identification information and the service configuration of each first target geographic interest point includes the following steps:
identifying the service type and the user identification information of each first target geographic interest point;
and if the user belongs to the user corresponding to the service type of the first target geographical interest point, obtaining the instruction content of the first target geographical interest point needing to be recalled, and executing a callback step according to the instruction content.
According to an example of the present invention, the method further comprises a geographic interest point retrieval method, the geographic interest point retrieval method comprises the following steps:
the method comprises the steps of obtaining user information and simultaneously obtaining a geographic interest point retrieval request of a user, wherein the request comprises fence information to be retrieved;
searching a plurality of second target geographical interest points covered by the fence information to be retrieved according to the position information of each geographical interest point in the mapping relation table;
and sending a plurality of second target geographical interest points to a user in a generating list.
According to an example of the present invention, the searching for a plurality of second target geographic interest points covered by the fence information to be retrieved according to the location information of each geographic interest point in the mapping relationship table includes the following steps:
determining a third CellID to be retrieved through a Googles2 algorithm according to the fence information to be retrieved;
determining a fourth CellID to be retrieved through a Googles2 algorithm according to the position information of each geographic interest point in the mapping relation table;
comparing the fourth CellID to the third CellID;
and if the fourth CellID is matched with the third CellID, the geographic interest point is considered as a second target geographic interest point.
The embodiment of the invention also provides a service system based on geographic information retrieval, which is used for realizing the service method based on geographic information retrieval, and comprises a user module, an algorithm module, a query module and a callback module, wherein:
the user module is used for acquiring user information, and the user information comprises user identification information and user geographic information;
the algorithm module determines a first CellID of the position where the user is located through a Google S2 algorithm according to the user geographic information;
the query module is used for searching a plurality of target geographic interest points of which the geographic fence information covers the first CellID;
and the callback module determines whether to trigger callback according to the user identification information and the service configuration of each target geographical interest point.
An embodiment of the present invention further provides an order generating device, including:
a processor;
a memory having stored therein executable instructions of the processor;
wherein the processor is configured to perform the steps of the geographic information retrieval based service method via execution of the executable instructions.
An embodiment of the present invention also provides a computer-readable storage medium storing a program that, when executed, implements the steps of the geographic information retrieval-based service method.
According to the method, the mapping relation table is established, the geographic interest points register related geographic fence information in advance and set corresponding business configuration rules, the service system based on geographic information retrieval can uniformly collect geographic position information of users and execute callback business in real time according to business types and the like of the geographic interest points, so that the internal computing cost of the system is reduced, and network communication pressure and server computing pressure caused by active query of a business party are avoided.
Drawings
Other features, objects, and advantages of the invention will be apparent from the following detailed description of non-limiting embodiments, which proceeds with reference to the accompanying drawings and which is incorporated in and constitutes a part of this specification, illustrating embodiments consistent with the present application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a flow chart of a service method based on geographic information retrieval according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a service system based on geographic information retrieval according to an embodiment of the present invention;
fig. 3 is a flowchart of the steps of finding a plurality of first target geographic interest points whose geo-fence information covers the first CellID according to an embodiment of the present invention;
FIG. 4 is a flowchart of establishing a mapping table according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a service device based on geographic information retrieval according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a computer-readable storage medium according to an embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
Fig. 1 is a flowchart of a service method based on geographic information retrieval according to an embodiment of the present invention, and specifically, the service method includes the following steps:
s100: acquiring user information, wherein the user information comprises user identification information and user geographic information;
s200: determining a first CellID of the position where the user is located through a Google S2 algorithm according to the geographic information of the user, defining a frame for decomposing a unit sphere into a cell hierarchical structure in the Google S2 algorithm, wherein the first CellID in the step S200 is the number of the area where the user is located;
s300: searching a plurality of first target geographic interest points of which the geographic fence information covers the first CellID;
s400: and determining whether to trigger a callback event according to the user identification information and the service configuration rule of each first target geographical interest point.
As shown in fig. 2, an embodiment of the present invention further provides a service system based on geographic information retrieval, for implementing the service method based on geographic information retrieval, where the system includes a user module M100, an algorithm module M200, a query module M300, and a callback module M400, where:
the user module M100 is configured to obtain user information, where the user information includes user identification information and user geographic information;
the algorithm module M200 determines the first CellID of the position where the user is located through the Google S2 algorithm according to the user geographic information;
the query module is used for searching a plurality of target geographic interest points of which the geographic fence information covers the first CellID;
and the callback module determines whether to trigger callback according to the user identification information and the service configuration of each target geographical interest point.
The function implementation manner of each functional module in the service system based on geographic information retrieval in this embodiment can be implemented by adopting a specific implementation manner of each step in the service method based on geographic information retrieval. For example, the user module M100, the algorithm module M200, the query module M300, and the callback module M400 may respectively implement their functions by using the specific implementation manners of the steps S100 to S400, which are not described herein again.
As shown in fig. 3, in this embodiment, the step S300: searching a plurality of first target geographic interest points of which the geographic fence information covers the first CellID; also comprises the following steps:
s310: searching a mapping relation table of each pre-established geographic interest point and the corresponding second CellID;
s320: comparing the first CellID of the position where the user is located with the second CellID corresponding to each geographic interest point;
s330: and if the first CellID is matched with a second CellID corresponding to the geographic interest point, the geographic interest point is considered as a first target geographic interest point.
In step S310, a mapping table between each geographic interest point and the corresponding second CellID may be pre-established, as shown in fig. 4, and the mapping table is established by the following method:
s311: receiving service requests of a plurality of geographic interest point management systems, wherein the service requests comprise geographic fence information and service configuration rules corresponding to the geographic interest points, and the geographic fence information comprises position information and distance thresholds of the corresponding geographic interest points; the location information of the geographic interest point in this step can be regarded as the physical location of the geographic interest point, and the distance threshold defines the desired coverage of the fence range of the geographic interest point.
The business configuration rule of the geographic interest point comprises one or more of the business type of the geographic interest point, the requirement of a user and the instruction content of the required call back.
The service types of the geographic interest points mainly comprise a specific user corresponding to one geographic interest point and a non-specific user corresponding to one geographic interest point; and if the service type of the geographic interest point corresponds to a specific user, the service configuration rule further comprises a specific user list.
The method for establishing the mapping relation table further comprises the following steps:
s312: determining a second CellID corresponding to each geographical interest point through a Google S2 algorithm according to the position information and the distance threshold of each geographical interest point;
s313: and establishing a mapping relation table of each geographic interest point and the corresponding second CellID. Generally, the callback service required by a geographic interest point usually covers a range, so that a geographic interest point in this step corresponds to a plurality of cellids, which form the second CellID.
According to the invention, the mapping relation table is established, each geographic interest point registers related geographic fence information in advance and sets a corresponding service configuration rule, and the service system based on geographic information retrieval can implement callback service in real time according to the service type and the like of each geographic interest point by uniformly collecting the geographic position information of the user, so that the internal calculation cost of the system is reduced. The method of the invention can avoid the network communication pressure and the server calculation pressure caused by the active query of the service party.
The service method based on geographic information retrieval improves the speed of user retrieval or geographic interest point retrieval service by establishing the CellID prestorage of each geographic interest point and corresponding geographic interest point, enables a large number of callback functions to be possible, and supports the rapid online geographic correlation function of an OTA related production line.
In another embodiment, S400: determining whether to trigger a callback according to the user identification information and the service configuration of each first target geographic interest point, and may further specifically include the following steps:
s410: identifying the service type and the user identification information of each first target geographic interest point;
s420: and if the user belongs to the user corresponding to the service type of the first target geographical interest point, obtaining the instruction content of the first target geographical interest point needing to be recalled, and executing a callback step according to the instruction content.
Taking an application scenario that a hotel arrival reminding in the OTA service is that a geographic interest point corresponds to a specific user as an example, at this time, a hotel is a first target geographic interest point, and the service type of the hotel is that a geographic interest point corresponds to a specific user. When the service system based on geographic information retrieval obtains the user geographic information of the user, judges that the user is in the geographic fence information range set by the hotel, and compares the geographic information range with a specific user list in the hotel business configuration rule of the user, a reminder such as a notice of being sent to the hotel is sent to the user, the instruction content needing to be recalled is different according to each business scene, and in the scenes, the hotel can also set businesses such as releasing the deposit. In a scene that a geographic interest point corresponds to a non-specific user, the geographic interest point can be a tourist attraction, and as long as a user enters a geofence information range set by the tourist attraction, callback operations such as introduction of the tourist attraction are sent to the user.
In step S300, for a user who usually finds a plurality of first target geographic interest points, still taking the above scenario as an example, after the user arrives at a predetermined hotel, the user may receive a reminder of the hotel arriving, and may also receive related information sent by a tourist attraction, a restaurant, etc. attached to the hotel.
The service method based on geographic information retrieval of an embodiment of the invention also comprises a geographic interest point retrieval method, and the geographic interest point retrieval method comprises the following steps:
s500: the method comprises the steps of obtaining user information and simultaneously obtaining a geographic interest point retrieval request of a user, wherein the request comprises fence information to be retrieved;
s600: searching a plurality of second target geographical interest points covered by the fence information to be retrieved according to the position information of each geographical interest point in the mapping relation table;
s700: and sending a plurality of second target geographical interest points to a user in a generating list.
Further, S600: the searching for a plurality of second target geographic interest points covered by the retrieved fence information according to the location information of each geographic interest point in the mapping relationship table may include the following steps:
s610: determining a third CellID to be retrieved through a Googles2 algorithm according to the fence information to be retrieved; the fence information to be searched in this step corresponds to a plurality of cellids, which constitute the third CellID.
S620: determining a fourth CellID to be retrieved through a Googles2 algorithm according to the position information of each geographic interest point in the mapping relation table;
s630: comparing the fourth CellID to the third CellID;
s640: and if the fourth CellID is matched with the third CellID, the geographic interest point is considered as a second target geographic interest point.
The effect of large numbers of POI searches is not ideal due to the performance bottleneck of traditional databases. In the service method based on geographic information retrieval, a redis data layer can be added on the basis of the existing infrastructure, and the geographic interest point retrieval speed is improved by pre-establishing a mapping relation table of each geographic interest point and corresponding CellID and storing the mapping relation table in a redis database. Further, on the basis of increasing the redis data layer, a memory data layer can be added, and data in the redis is placed into different machine memories for storage. And the requests belonging to the same CellID can be placed on the same machine, so that resource waste caused by the storage of the same data on different machines is avoided, the access pressure on a redis data layer is reduced, the network communication cost is reduced, the quick retrieval of geographical interest point data can be realized, and the user experience is improved.
An electronic device 600 according to this embodiment of the invention is described below with reference to fig. 5. The electronic device 600 shown in fig. 5 is only an example and should not bring any limitation to the functions and the scope of use of the embodiments of the present invention.
As shown in fig. 5, the electronic device 600 is embodied in the form of a general purpose computing device. The components of the electronic device 600 may include, but are not limited to: at least one processing unit 610, at least one memory unit 620, a bus 630 connecting the different platform components (including the memory unit 620 and the processing unit 610), a display unit 640, etc.
Wherein the storage unit stores program code which can be executed by the processing unit 610 such that the processing unit 610 performs the steps according to various exemplary embodiments of the present invention as described in the above-mentioned method section of the present specification. For example, processing unit 610 may perform the steps as shown in fig. 5.
The storage unit 620 may include readable media in the form of volatile memory units, such as a random access memory unit (RAM)6201 and/or a cache memory unit 6202, and may further include a read-only memory unit (ROM) 6203.
The memory unit 620 may also include a program/utility 6204 having a set (at least one) of program modules 6205, such program modules 6205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
An embodiment of the present invention further provides a computer-readable storage medium for storing a program, where the program is executed to implement the steps of the service method for sorting based on geographic information retrieval. In some possible embodiments, the various aspects of the invention may also be implemented in the form of a program product comprising program code means for causing a terminal device to carry out the steps according to the various exemplary embodiments of the invention described in the method part above of this description when said program product is run on the terminal device.
Referring to fig. 6, a program product 800 for implementing the above method according to an embodiment of the present invention is described, which may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited in this regard and, in the present document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
A computer readable storage medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable storage medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including AN object oriented programming language such as Java, C + +, or the like, as well as conventional procedural programming languages, such as the "C" language or similar programming languages.
In summary, the present invention provides a service method, system, device and storage medium based on geographic information retrieval, the method includes the following steps: acquiring user information, wherein the user information comprises user identification information and user geographic information; determining a first CellID of the position where the user is located through a Google S2 algorithm according to the geographic information of the user; searching a plurality of first target geographic interest points of which the geographic fence information covers the first CellID; and determining whether to trigger a callback event according to the user identification information and the service configuration rule of each first target geographical interest point. According to the invention, the mapping relation table is established, each geographic interest point registers related geographic fence information in advance and sets a corresponding service configuration rule, and the service system based on geographic information retrieval can implement callback service in real time according to the service type and the like of each geographic interest point by uniformly collecting the geographic position information of the user, so that the internal calculation cost of the system is reduced. The method of the invention avoids the network communication pressure and the server calculation pressure caused by the active query of the service party.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the apparatus claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (11)
1. A service method based on geographic information retrieval is characterized by comprising the following steps:
acquiring user information, wherein the user information comprises user identification information and user geographic information;
determining a first CellID of the position where the user is located through a Google S2 algorithm according to the geographic information of the user;
searching a plurality of first target geographic interest points of which the geographic fence information covers the first CellID;
and determining whether to trigger a callback event according to the user identification information and the service configuration rule of each first target geographical interest point.
2. The geographic information retrieval-based service method of claim 1, wherein the step of searching for the geographic fence information covering a plurality of first target geographic interest points of the first CellID comprises the steps of:
searching a mapping relation table of each pre-established geographic interest point and the corresponding second CellID;
comparing the first CellID of the position where the user is located with the second CellID corresponding to each geographic interest point;
and if the first CellID is matched with a second CellID corresponding to the geographic interest point, the geographic interest point is considered as a first target geographic interest point.
3. The service method based on geographic information retrieval as recited in claim 2, wherein the mapping relation table is established by the following method:
receiving service requests of a plurality of geographic interest point management systems, wherein the service requests comprise geographic fence information and service configuration rules corresponding to the geographic interest points, and the geographic fence information comprises position information and distance thresholds of the corresponding geographic interest points;
determining a second CellID corresponding to each geographical interest point through a Google S2 algorithm according to the position information and the distance threshold of each geographical interest point;
and establishing a mapping relation table of each geographic interest point and the corresponding second CellID.
4. The geographic information retrieval-based service method as claimed in claim 3, wherein the business configuration rule of the geographic interest point comprises one or more of a business type of the geographic interest point, a user requirement and an instruction content of a required callback.
5. The service method based on geographic information retrieval as recited in claim 4, wherein the service type of the geographic interest point comprises a geographic interest point corresponding to a specific user and a geographic interest point corresponding to a non-specific user;
and if the service type of the geographic interest point corresponds to a specific user, the service configuration rule further comprises a specific user list.
6. The geographic information retrieval-based service method according to claim 5, wherein the step of determining whether to trigger a callback according to the user identification information and the service configuration of each first target geographic interest point comprises the following steps:
identifying the service type and the user identification information of each first target geographic interest point;
and if the user belongs to the user corresponding to the service type of the first target geographical interest point, obtaining the instruction content of the first target geographical interest point needing to be recalled, and executing a callback step according to the instruction content.
7. The geographic information retrieval-based service method according to claim 3, further comprising a geographic interest point retrieval method, the geographic interest point retrieval method comprising the steps of:
the method comprises the steps of obtaining user information and simultaneously obtaining a geographic interest point retrieval request of a user, wherein the request comprises fence information to be retrieved;
searching a plurality of second target geographical interest points covered by the fence information to be retrieved according to the position information of each geographical interest point in the mapping relation table;
and sending a plurality of second target geographical interest points to a user in a generating list.
8. The geographic information retrieval-based service method according to claim 3, wherein the step of searching for a plurality of second target geographic interest points covered by the fence information to be retrieved according to the location information of each geographic interest point in the mapping relationship table comprises the following steps:
determining a third CellID to be retrieved through a Googles2 algorithm according to the fence information to be retrieved;
determining a fourth CellID to be retrieved through a Googles2 algorithm according to the position information of each geographic interest point in the mapping relation table;
comparing the fourth CellID to the third CellID;
and if the fourth CellID is matched with the third CellID, the geographic interest point is considered as a second target geographic interest point.
9. A service system based on geographic information retrieval, for implementing the service method based on geographic information retrieval of any one of claims 1 to 8, characterized by comprising a user module, an algorithm module, a query module and a callback module, wherein:
the user module is used for acquiring user information, and the user information comprises user identification information and user geographic information;
the algorithm module determines a first CellID of the position where the user is located through a Google S2 algorithm according to the user geographic information;
the query module is used for searching a plurality of target geographic interest points of which the geographic fence information covers the first CellID;
and the callback module determines whether to trigger callback according to the user identification information and the service configuration of each target geographical interest point.
10. A service device based on geographic information retrieval, comprising:
a processor;
a memory having stored therein executable instructions of the processor;
wherein the processor is configured to perform the steps of the geographic information retrieval based service method of any one of claims 1 to 8 via execution of the executable instructions.
11. A computer-readable storage medium storing a program, wherein the program is executed to implement the steps of the service method based on geographical information retrieval of any one of claims 1 to 8.
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| CN112866992A (en) * | 2021-01-22 | 2021-05-28 | 湖南大学 | Position privacy protection method and system |
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