Storage method and device of beidou grid data model in database

Abstract

The present disclosure provides a storage method of a Beidou grid data model in a database, comprising: obtaining two-dimensional coordinate information or three-dimensional coordinate information in a relational database; determining a corresponding hierarchical level of a Beidou subdivision grid code according to an actual application scenario of the two-dimensional coordinate information or the three-dimensional coordinate information, and generating a corresponding hierarchical level field level; converting the two-dimensional coordinate information or the three-dimensional coordinate information into the corresponding hierarchical level of the Beidou subdivision grid code, and generating a corresponding latitude-longitude subdivision code field code and an elevation subdivision code field zcode; encapsulating the hierarchical level field level, the latitude-longitude subdivision code field code and the elevation subdivision code field zcode into the same field grid, and storing the field grid in a tb_location table corresponding to the two-dimensional coordinate information or the three-dimensional coordinate information in the relational database, and generating a grid cell gridcell. In this way, data encapsulation and consistency can be ensured, data management is convenient, and the parallel computing capability of the database can be fully utilized.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure generally relate to the technical field of geographic information processing, and more particularly, to a storage method and device of a Beidou grid data model in a database. BACKGROUND

[0002] With the rapid development of information technology, the cost of satellite remote sensing and satellite navigation data acquisition is reduced, and the storage, management and retrieval of massive spatial data are increasingly required.

[0003] Spatial databases have developed rapidly in the past 20 years, and many excellent relational spatial database products have emerged at home and abroad, such as Oracle Spatial and PostGIS. These databases generally use Geometry geometric data model composed of coordinates or coordinate sequences, and the spatial index generally uses R-Tree index. The traditional spatial geometric data model and spatial index have many problems in data precision and massive data retrieval performance.

[0004] In the existing database, the grid encoding and hierarchical field storage cannot guarantee data encapsulation and consistency; the non-point feature and the grid are in a one-to-many relationship, and the data management is not convenient; the data is stored in the database and calculated outside the database, and the data is in and out of the database multiple times, resulting in a large amount of redundant IO; the calculation outside the database cannot fully utilize the parallel computing capability of the database. SUMMARY

[0005] According to embodiments of the present disclosure, a storage scheme of a Beidou grid data model in a database is provided, which can guarantee data encapsulation and consistency, convenient data management, and full utilization of the parallel computing capability of the database.

[0006] In a first aspect of the present disclosure, a storage method of a Beidou grid data model in a database is provided, comprising:

[0007] Obtaining two-dimensional coordinate information or three-dimensional coordinate information in a relational database, wherein the two-dimensional coordinate information or three-dimensional coordinate information is stored in the form of a tb_location table in the relational database;

[0008] According to the actual application scene of the two-dimensional coordinate information or three-dimensional coordinate information, determining the level of the corresponding Beidou subdivision grid encoding, and generating a corresponding level field level;

[0009] Converting the two-dimensional coordinate information or three-dimensional coordinate information into the corresponding level of the Beidou subdivision grid encoding, and generating a corresponding longitude and latitude subdivision encoding field code and an elevation subdivision encoding field zcode;

[0010] The level field level, the latitude-longitude subdivision encoding field code, and the elevation subdivision encoding field zcode are packaged into the same field grid, and the field grid is stored in the tb_location table corresponding to two-dimensional coordinate information or three-dimensional coordinate information in the relational database, to generate a grid cell gridcell.

[0011] In some embodiments, the method further comprises:

[0012] A type flag field dim is defined in the grid cell gridcell, and the type flag field dim is used to distinguish the grid cell gridcell corresponding to the two-dimensional coordinate information and the three-dimensional coordinate information.

[0013] In some embodiments, the latitude-longitude subdivision encoding field code in the grid cell gridcell is that the longitude encoding and the latitude encoding are combined into one-dimensional binary encoding by Morton encoding and stored in the latitude-longitude subdivision encoding field code.

[0014] In some embodiments, the relational database stores a grid encoding algorithm;

[0015] The two-dimensional coordinate information or the three-dimensional coordinate information is converted into the Beidou subdivision grid code corresponding to the level, including:

[0016] The grid encoding algorithm stored in the relational database is called to convert the two-dimensional coordinate information or the three-dimensional coordinate information into the Beidou subdivision grid code corresponding to the level.

[0017] In some embodiments, the two-dimensional coordinate information or the three-dimensional coordinate information in the relational database is obtained, including:

[0018] The tb_location table in the relational database is obtained, and the longitude and the latitude of the current coordinate information are determined according to the lng field and the lat field in the tb_location table;

[0019] The height of the current coordinate information is determined according to the height field in the tb_location table.

[0020] In some embodiments, the method further comprises:

[0021] The non-point feature in the relational database is packaged together with the corresponding plurality of grid cells gridcell to generate a grid set geomgrids including the non-point feature and the grid cell set.

[0022] In some embodiments, the grid set geomgrids includes a plurality of different levels of grid cells gridcell, and a plurality of different grid cells gridcell of the same level.

[0023] In a second aspect of the present disclosure, a storage device of a Beidou grid data model in a database is provided, comprising:

[0024] An information acquisition module is configured to acquire two-dimensional coordinate information or three-dimensional coordinate information in a relational database, wherein the two-dimensional coordinate information or three-dimensional coordinate information is stored in the relational database in the form of a tb_location table;

[0025] A level determination module is configured to determine a level of a corresponding Beidou subdivision grid code according to an actual application scenario of the two-dimensional coordinate information or three-dimensional coordinate information, and generate a corresponding level field level.

[0026] An encoding module is configured to convert the two-dimensional coordinate information or three-dimensional coordinate information into a Beidou subdivision grid code of a corresponding level, and generate a corresponding latitude-longitude subdivision encoding field code and an elevation subdivision encoding field zcode.

[0027] A data storage module is configured to encapsulate the level field level, the latitude-longitude subdivision encoding field code, and the elevation subdivision encoding field zcode into a same field grid, and store the field grid in a tb_location table corresponding to the two-dimensional coordinate information or three-dimensional coordinate information in the relational database, and generate a grid cell gridcell.

[0028] In a third aspect of the present disclosure, an electronic device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the method described above when executing the program.

[0029] In a fourth aspect of the present disclosure, a computer readable storage medium is provided, which stores a computer program, and the program is executed by a processor to implement the method described above.

[0030] Through the storage method of the Beidou grid data model in the database of the present disclosure, data encapsulation and consistency can be ensured, data management is convenient, and the parallel computing capability of the database can be fully utilized.

[0031] It should be understood that the content described in the summary section is not intended to limit the key or important features of the embodiments of the present disclosure, nor to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. In the drawings:

[0033] Figure 1 A flow chart of a storage method of a Beidou grid data model in a database according to an embodiment of the present disclosure is shown;

[0034] Figure 2 A structural schematic diagram of a storage device of a Beidou grid data model in a database according to an embodiment of the present disclosure is shown;

[0035] Figure 3 A structural schematic diagram of a storage device of a Beidou grid data model in a database according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0037] In addition, the term "and / or" herein merely describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0038] The storage method of the Beidou grid data model in the database according to the embodiments of the present disclosure can guarantee data encapsulation and consistency, facilitate data management, and fully utilize the parallel computing capability of the database. Specifically, as shown in Figure 1 A flow chart of a storage method of a Beidou grid data model in a database according to an embodiment of the present disclosure is shown. As can be seen from Figure 1 The storage method of the Beidou grid data model in the database according to the embodiments of the present disclosure can include the following steps:

[0039] S101: Obtain two-dimensional coordinate information or three-dimensional coordinate information in a relational database, wherein the two-dimensional coordinate information or the three-dimensional coordinate information is stored in the relational database in the form of a tb_location table.

[0040] The method of the embodiment is used for processing in and out of coordinate information in a relational database. The storage type of the coordinate information in the relational database is usually Geometry (a latitude and longitude coordinate implementation model). In Geometry, one coordinate represents one ground point, and multiple coordinate sequences represent a line, a surface, or a body. Since a general spatial database does not have a Beidou grid subdivision code special data model, nor does it provide generation, conversion, calculation, and analysis functions for the grid subdivision code model, nor does it provide a spatial index based on the grid subdivision code model. Based on this, the embodiment converts the coordinate information in the relational database into Beidou subdivision codes. The Beidou subdivision code consists of two parts: a grid code and a grid level. The grid code is used to represent a geographic location, and the grid level is used to express the grid granularity. The general relational spatial database does not have a special storage model for Beidou subdivision codes. In actual application, the grid code and the grid need to be stored separately. For lines and polygons, one Geometry corresponds to multiple grid codes, and the relationship between multiple grid codes and one Geometry needs to be maintained in the database.

[0041] First, two-dimensional coordinate information or three-dimensional coordinate information needs to be obtained from the relational database, wherein the two-dimensional coordinate information or the three-dimensional coordinate information is stored in the relational database in the form of a tb_location table.

[0042] S102: According to the actual application scenario of the two-dimensional coordinate information or the three-dimensional coordinate information, the level of the corresponding Beidou subdivision grid code is determined, and a corresponding level field level is generated.

[0043] After obtaining the two-dimensional coordinate information or the three-dimensional coordinate information in the relational database, the level of the corresponding Beidou subdivision grid code needs to be further determined, and a corresponding level field level is generated.

[0044] S103: The two-dimensional coordinate information or the three-dimensional coordinate information is converted into the Beidou subdivision grid code of the corresponding level, and a corresponding latitude and longitude subdivision code field code and an elevation subdivision code field zcode are generated.

[0045] Specifically, a user-defined coding algorithm in the relational database can be called, that is, the database of the embodiment supports a user-defined coding algorithm.

[0046] S104: The level field level, the latitude and longitude subdivision code field code, and the elevation subdivision code field zcode are encapsulated into the same field grid, and the field grid is stored in the tb_location table corresponding to the two-dimensional coordinate information or the three-dimensional coordinate information in the relational database, and a grid cell gridcell is generated.

[0047] Specifically, a composite type gridcell is defined in the relational database to represent a 2D or 3D unit grid in Beidou subdivision, that is, coordinate information in the relational database. The Beidou subdivision grid is divided into a 2D grid and a 3D grid. The 2D grid is divided into latitude and longitude respectively, and then combined into a one-dimensional binary code through Morden coding. The grid level is from 1-32, and each level is expressed by 2 binary bits. A 64-bit unsigned long can store 32 levels of 2D codes. The 3D grid adds an elevation subdivision code on the basis of the 2D grid. The range of elevation subdivision is also 1-32, and one binary bit is used to represent one-level subdivision. A 32-bit unsigned integer can store 32 levels of elevation codes. The level range is 1-32, which can be stored by unsigned char. Since gridcell is compatible with 2D / 3D, a type flag dim is needed to distinguish between 2D and 3D grids.

[0048] In summary, the structure of the gridcell data type is as follows:

[0049]

[0050] The variables in the structure are as follows:

[0051]

[0052] Regardless of 32-bit or 64-bit operating systems, after memory alignment, a gridcell object occupies a memory space of 16 bytes.

[0053] The two- and three-dimensional gridcell generation functions are implemented respectively, and their prototypes are as follows:

[0054] gridcell ST_AsGridcell(double lng, double lat, integer level)

[0055] gridcell ST_AsGridcell3D(double lng, double lat, double height, integer level) Taking ST_AsGridcell3D as an example, the calculation steps are as follows:

[0056] 1. tb_location is a table in the relational database, and lng, lat, and height are coordinate longitude, latitude, and elevation, respectively.

[0057] 2. Add a field named grid in the tb_location table, and the field type is gridcell

[0058] 3. Determine the level of the grid according to the business requirements

[0059] 4. Update the grid field in tb_location by update statement.

[0060] Update tb_location set grid=st_AsGridcell(lng,lat,height,level).

[0061] 5. In st_AsGridcell, for each set of lng, lat, height, level passed in, generate the corresponding longitude and latitude subdivision code, height subdivision code zcode by the Beidou grid subdivision algorithm, and encapsulate them as a gridcell object together with level.

[0062] 6. The update statement writes each gridcell object sequence into the grid field after serialization.

[0063] 7. Loop until all rows in the table are executed.

[0064] Through the above method, the coordinate information in the relational database can be converted into the form of Beidou subdivision grid code storage. The coordinate information in the form of Beidou grid code and the original coordinate information in the relational database are encapsulated together to ensure data encapsulation and consistency, making data management convenient. At the same time, the conversion technology of coordinate information coding form is completed in the database, so as to fully utilize the parallel computing capability of the database.

[0065] As an optional embodiment of the present disclosure, in the above embodiment, the non-point feature in the relational database and the corresponding plurality of grid cells gridcell can also be encapsulated together to generate a grid set geomgrids including non-point features and grid cell set.

[0066] Specifically, a composite type geomgrids is defined in the relational database, which is a set type of Beidou subdivision grid, composed of one or more unit grids with the same or different levels. It can be used to represent non-point geometric features, so as to realize one-to-one correspondence between Geometry object and GeomGrids object.

[0067] There may be unit grids of different levels in a geomgrids, and the level of the highest grid unit is the level of the geomgrids object, called detailLevel.

[0068] Geomgrids support 2D / 3D grid cells, but not both 2D and 3D at the same time. It is required that the grid cells are either all 2D or all 3D. There is also a dim member in Geomgrids that stores the dimension information.

[0069] The storage structure of Geomgrids is as follows:

[0070]

[0071] The variables in the structure are as follows:

[0072]

[0073] Cells is an offset that stores the grid cells in a geomgrids object. The length of Cell depends on the number of grid cells and the dimension type of the grid cells. The storage structure is different in 2D / 3D cases. In order to save storage space, when geomgrids is 2D, the zcode value of the grid cell is not stored.

[0074] Internal structure of Cells (2D)

[0075] code1 level1 code2 level2 …… Code_n Level_n

[0076] Internal structure of Cells (3D)

[0077] code1 zcode1 level1 code2 zcode2 level2 …… Code_n zcode_n Level_n

[0078] The method of the embodiment can store non-point elements in a relational database in the form of Beidou subdivision grid encoding, and establish an association between the latitude and longitude coordinate storage mode and the Beidou subdivision grid encoding storage mode of the non-point elements, thereby ensuring data encapsulation and consistency and facilitating data management.

[0079] It should be noted that, for each of the foregoing method embodiments, in order to simply describe, it is expressed as a combination of a series of actions, but those skilled in the art should understand that the disclosure is not limited by the order of the described actions, because according to the disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the disclosure.

[0080] The above is the introduction of the method embodiment, and the following will further illustrate the scheme of the disclosure through the device embodiment.

[0081] As Figure 2As shown, it is a structural schematic diagram of a storage device of a Beidou grid data model in a database according to Embodiment Two of the present disclosure. The storage device of the Beidou subdivision grid code of the present embodiment comprises:

[0082] The information acquisition module 201 is configured to acquire two-dimensional coordinate information or three-dimensional coordinate information in a relational database, wherein the two-dimensional coordinate information or three-dimensional coordinate information is stored in the relational database in the form of a tb_location table.

[0083] The level determination module 202 is configured to determine the level of the corresponding Beidou subdivision grid code according to the actual application scenario of the two-dimensional coordinate information or three-dimensional coordinate information, and generate a corresponding level field level.

[0084] The encoding module 203 is configured to convert the two-dimensional coordinate information or three-dimensional coordinate information into the Beidou subdivision grid code of the corresponding level, and generate a corresponding latitude-longitude subdivision encoding field code and an elevation subdivision encoding field zcode.

[0085] The data storage module 204 is configured to encapsulate the level field level, the latitude-longitude subdivision encoding field code, and the elevation subdivision encoding field zcode into the same field grid, and store the field grid in the tb_location table corresponding to the two-dimensional coordinate information or three-dimensional coordinate information in the relational database, and generate a grid cell gridcell.

[0086] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the described modules can refer to the corresponding process in the foregoing method embodiments, which will not be described herein.

[0087] Figure 3 A schematic block diagram of an electronic device 300 that can be used to implement embodiments of the present disclosure is shown. As shown, the device 300 includes a central processing unit (CPU) 301, which can perform various appropriate actions and processes according to computer program instructions stored in a read-only memory (ROM) 302 or loaded from a storage unit 308 into a random access memory (RAM) 303. In the RAM 303, various programs and data required for the operation of the device 300 can also be stored. The CPU 301, the ROM 302, and the RAM 303 are connected to each other through a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0088] A number of the components in device 300 are connected to I / O interface 305, including an input unit 306, such as a keyboard, mouse, etc.; an output unit 307, such as various types of displays, speakers, etc.; a storage unit 308, such as a disk, a CD, etc.; and a communication unit 309, such as a network card, a modem, a wireless communication transceiver, etc. Communication unit 309 allows device 300 to exchange information / data with other devices over a computer network, such as the Internet, and / or various telecommunication networks.

[0089] Processing unit 301 performs various methods and processes described above, which are tangibly embodied in a machine-readable medium, such as storage unit 308. In some embodiments, portions or all of a computer program can be loaded onto device 300 via ROM 302 and / or communication unit 309. When a computer program is loaded onto RAM 303 and executed by CPU 301, one or more steps of the methods described above can be performed. Alternatively, in other embodiments, CPU 301 can be configured to perform the above methods by any other suitable means, such as by means of firmware.

[0090] The functionality described herein above can be performed, at least in part, by one or more hardware logic components. For example, and without limitation, illustrative types of hardware logic components that can be used include Field-programmable Gate Arrays (FPGAs), Application-specific Integrated Circuits (ASICs), Application-specific Standard Products (ASSPs), System-on-a-chip systems (SOCs), Complex Programmable Logic Devices (CPLDs), etc.

[0091] Program code for carrying out methods of the present disclosure can be written in any combination of one or more programming languages. The program code can be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the program code, when executed by the processor or controller, produces a means for implementing the functions / operations specified in the flowchart and / or block diagram block or blocks. The program code can execute entirely on a machine, partly on a machine, as a stand-alone software package, partly on a machine and partly on a remote machine or entirely on a remote machine or server.

[0092] In the context of this disclosure, a machine-readable medium can be a tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include but is not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium will include one or more lines of electrical connections, portable computer disks, hard disk drives, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or Flash memory), optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the foregoing.

[0093] Moreover, while operations have been depicted in a particular order, this should not be understood as requiring such order nor that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing can be advantageous. Likewise, while several specific implementation details have been discussed, these should not be construed as limitations on the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination.

[0094] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A method for storing a Beidou grid data model in a database, characterized in that, The method comprises the following steps: Obtaining two-dimensional coordinate information or three-dimensional coordinate information in a relational database, wherein the two-dimensional coordinate information or three-dimensional coordinate information is stored in the relational database in the form of a tb_location table; specifically comprising: Obtaining the tb_location table in the relational database, and determining the longitude and latitude of the current coordinate information according to the lng field and the lat field in the tb_location table; Determining the elevation of the current coordinate information according to the height field in the tb_location table; According to the actual application scene of the two-dimensional coordinate information or the three-dimensional coordinate information, the corresponding hierarchical Beidou subdivision grid code is determined, and the corresponding level field is generated; the relational database stores a grid code algorithm; Calling the grid code algorithm stored in the relational database, converting the two-dimensional coordinate information or the three-dimensional coordinate information into the corresponding hierarchical Beidou subdivision grid code, and generating the corresponding latitude-longitude subdivision code field code and the elevation subdivision code field zcode; The level field level, the latitude-longitude subdivision code field code and the elevation subdivision code field zcode are packaged into the same field grid, and the field grid is stored in the tb_location table corresponding to the two-dimensional coordinate information or the three-dimensional coordinate information in the relational database, to generate a grid cell gridcell; the latitude-longitude subdivision code field code in the grid cell gridcell is one-dimensional binary code stored in the latitude-longitude subdivision code field code by combining the longitude code and the latitude code through Morden code.

2. The method of claim 1, wherein the storage of the Beidou grid data model in the database is characterized by, The method further comprises: Defining a type flag field dim in the grid cell gridcell, wherein the type flag field dim is used to distinguish the grid cell gridcell corresponding to the two-dimensional coordinate information and the three-dimensional coordinate information.

3. The method of claim 1, wherein the method further comprises: determining a plurality of grid cells of the plurality of grid cells that are within a predetermined distance of the location; and determining a plurality of grid cells of the plurality of grid cells that are within a predetermined distance of the location. The method further comprises: Packaging the non-point feature in the relational database together with the corresponding plurality of grid cells gridcell, to generate a grid set geomgrids comprising a non-point feature and a grid cell set.

4. The method of claim 3, wherein the BeiDou grid data model is stored in the database. The grid set geomgrids comprises a plurality of grid cells gridcell of different levels and a plurality of different grid cells gridcell of the same level.

5. A storage device of a Beidou grid data model in a database, characterized in that, The information acquisition module is configured to obtain two-dimensional coordinate information or three-dimensional coordinate information in a relational database, wherein the two-dimensional coordinate information or three-dimensional coordinate information is stored in the relational database in the form of a tb_location table; specifically comprising: Obtaining the tb_location table in the relational database, and determining the longitude and latitude of the current coordinate information according to the lng field and the lat field in the tb_location table; Determining the elevation of the current coordinate information according to the height field in the tb_location table; ​ A hierarchy determining module is configured to determine a hierarchy of a corresponding Beidou subdivision grid code according to an actual application scenario of the two-dimensional coordinate information or the three-dimensional coordinate information, and generate a corresponding hierarchy field level; and the relational database stores a grid code algorithm; An encoding module is configured to call the grid code algorithm stored in the relational database, convert the two-dimensional coordinate information or the three-dimensional coordinate information into the Beidou subdivision grid code of the corresponding hierarchy, and generate a corresponding latitude-longitude subdivision code field code and an elevation subdivision code field zcode; A data storage module is configured to encapsulate the hierarchy field level, the latitude-longitude subdivision code field code, and the elevation subdivision code field zcode into a same field grid, store the field grid in a tb_location table corresponding to the two-dimensional coordinate information or the three-dimensional coordinate information in the relational database, and generate a grid cell gridcell; the latitude-longitude subdivision code field code in the grid cell gridcell is one-dimensional binary code obtained by combining a longitude code and a latitude code through Morden coding and stored in the latitude-longitude subdivision code field code. 6.An electronic device comprising a memory and a processor, the memory having stored thereon a computer program, characterized in that, The processor executes the program to implement the method in any one of claims 1-4.

7. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the method in any one of claims 1-4.

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