CN109241216A - The method for realizing grid-based management using power grid hierarchical storage database schema - Google Patents
The method for realizing grid-based management using power grid hierarchical storage database schema Download PDFInfo
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Abstract
The invention discloses provide a kind of method for realizing grid-based management using power grid hierarchical storage database schema, first, according to the natural characteristic of electric network composition, to classified using the contents of a project as the project volume data of separate storage body, data base administration in subregional, and store and transmit project volume data using densification format；Later, each project volume data includes the operational management parameter and geographic information data of the predefined various power grid elements of data base management system, and the associated calculation method of project volume data is automatically performed the electric topology of project needs, electrical parameter statistics and geometric parameter and calculates；Based on the present invention is according to power grid grade, operational management unit, using power grid project as the data base administration framework of basic unit of storage, by conventional GIS system with power grid element be management granularity be promoted to power grid project be management granularity, the storage unit that power grid element is opened up in project, greatly improves data management efficiency.
Description
Technical field
The present invention relates to the technical fields of power grid grid-based management, use power grid hierarchical storage data more particularly, to a kind of
The method of library framework realization grid-based management.
Background technique
Currently, the background data base of electric power GIS application system is substantially relevant database, such as: Oracle,
The classical relations type data base management system such as SQLserver, DB2, is stored in different record sheets by power grid element classification, number
When less according to storage size, efficiency is not problem, and when forming mass data, the retrieval of project objective data will be seriously affected
The efficiency of foreground application system, many systems seriously affect functionization because of the high speed expansion of database in practical application
It is horizontal；Gridding planning, management and service are the important ideas that management is unfolded in each Utilities Electric Co. the present and the future, are grid
The information system that change theory provides data supporting will have the technical capability of power grid element in quick, dynamic performance grid.
However, prior art frame is often manual retrieval and the integrated data for calculating grid interior element, inefficiency, number
According to the problems such as inaccuracy than more serious.Relational data storage is due to constitution reasons in structure building quickly steady gridding support
Framework is realized upper extremely difficult in informationization technology.
Application publication number is that the patent application of 108182194 A of CN discloses a kind of gridding division based on power grid GIS
Management method, step 1: in power grid GIS geographical map press occupied area grid division；Step 2: calculating separately in a period of time
Quantifiable indicator of each key business visual angle in each grid in range, and the power distributed according to each key business visual angle
Weight ratio calculates the distribution operation trend overall performane in each grid；Step 3: by degree of concern that distribution operation trend is total
Index is divided into 5 grades, with from shallowly filling grid to deep color.The patent application, will be multiple by ZOOM analysis unit
The data of operation system carry out horizontal integrating, are effectively analyzed key business data and depth is excavated, and formation one can be with
The achievement data of quantization, and it is weaker to combine power grid GIS figure with different colors intuitively to indicate which block region, according to face
The operation trend situation of distribution is grasped in the variation of color in time, guarantees the healthy and stable operation of distribution.However, the patent application can only
The management for carrying out operation of power networks parameter, can not realize the management of geographic information data.
Application publication number is that the patent application of CN105069703A discloses a kind of electrical network mass data management method, the party
Method includes: building power grid user data management system, and each collected data of power grid subsystem are integrated, and using simultaneously
Row Computational frame is excavated and is analyzed to the data of power grid user；Management system based on the data utilizes distributed terminator
Prediction algorithm realizes parallel load prediction.The invention proposes a kind of electrical network mass data management method, is respectively by power grid user
The data of system are merged and are integrated, and traditional data calculation method is moved in distributed platform, meet mass data
Operation requirement.However, the invention can not be suitable for grid automation management of computing.
Summary of the invention
In view of this, using power grid hierarchical storage number in view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of
It is basic with power grid project based on power grid grade, operational management unit according to the method that library framework realizes grid-based management
Conventional GIS system with power grid element is that management granularity is promoted to and is with power grid project by the data base administration framework of storage unit
Granularity is managed, the storage unit of power grid element is opened up in project, data management efficiency is greatly improved, with this data service frame
The gridding tenability provided based on frame, can automatically, accurately calculate grid contents, reach the various applications of gridding
Real time implementation operation level.
In order to achieve the above objectives, the invention adopts the following technical scheme:
The method for realizing grid-based management using power grid hierarchical storage database schema, comprising the following steps:
Step 1, the natural characteristic according to electric network composition, to being carried out point using the contents of a project as the project volume data of separate storage body etc.
Grade, data base administration in subregional, and project volume data is stored and transmitted using densification format；
Step 2, each project volume data include the operational management parameter of the predefined various power grid elements of data base management system
And geographic information data, the associated calculation method of project volume data are automatically performed the electric topology of project needs, electrical parameter statistics
It is calculated with geometric parameter；
Step 3, the mesh-managing parameter that various types and rank are defined according to regulatory requirement, calculate grids at different levels automatically
The geometric parameter of nested management attribute and grid；
Step 4, the geometric parameter in conjunction with grid and data base management system mean terms purpose mesh-managing parameter utilize geometrical plane
Enter option in Collision Detection mass-election grid, to greatly improve the rapidity, validity and overall efficiency of grid computing；
Project carries out intersection in step 5, the grid being selected in mass-election and comprising calculating, accurate calculation goes out the power grid for including in grid
Project and electrical elements carry out statistics calculating to a variety of mesh parameters.
Further, in the step 1, the natural characteristic of electric network composition includes grade and operational management.
Further, in the step 1, the storage scheme of project volume data is as follows:
Data base management system manages multiple entity Grids simultaneously, and each entity Grid forms a partition holding,
Each partition holding is a unit service example of data base management system, and is responsible for account in this subregion, status project, rule
Project, whole management roles of grid system are drawn, opens up different storage sub-districts respectively according to item types in each subregion, respectively
Project memory bank uses file densification storage format, and file name associated item meaning, and extension name is unified to use " .geplan "
Suffix.
Further, in the step 3, the calculating of mesh-managing parameter includes the geometric area in geographical face domain, geometry packet
Enclose box, geometric center, radius of electricity supply and profile set of vertices parameter.
Further, the profile set of vertices gain of parameter method is as follows:
A. the geometric coordinate scatter plot arrangement of project interior element is marked；
B. a border element is arbitrarily extracted as first starting point, then makees horizontal/vertical ray to right/left, later the inverse time
Needle/rotate clockwise ray is then first element with the element of ray intersection；
C. using first element as second starting point, then obtain second element in the method for step b, and so on circulation
Operation terminates operation when being first starting point with the element of ray intersection, then each starting point obtained in cycle operation process
The as profile set of vertices in project geometric surface domain.
Further, in the step 2, it includes grid bounding box, profile set of vertices that the geometric parameter of grid, which calculates,
Parameter calculates.
Further, in the profile set of vertices in the project geometric surface domain of acquisition, with continuous toe-in in four sides
Square surrounds profile set of vertices, and each side stops convergence when encountering vertex for the first time, and square when all terminating convergence is institute
Grid bounding box is stated, the angle steel joint coordinate of square is the grid bounding box coordinate.
Further, in the step 4, the side for entering option in geometrical plane Collision Detection mass-election grid is utilized
Method is as follows: assuming that grid bounding box top-left coordinates parameter is (Wj_min, Ww_max), lower right coordinate parameter is (Wj_max, Ww_
Min), any project bounding box top-left coordinates parameter is (Xj_min, Xw_max), and lower right coordinate parameter is (Xj_max, Xw_
Min), the algorithm criterion of crash type detection are as follows:
It 1) include criterion
[(Wj_min<Xj_min<Wj_max)and(Wj_min<Xj_max<Wj_max)]and[(Ww_min<Xw_min<Ww_
max)and(Ww_min<Xw_max<Ww_max)]；
2) mutually from criterion
[(Xj_min>Wj_maxorXj_min<Wj_min)and(Xj_max>Wj_maxorXj_max<Wj_min)]or[(Xw_
min>Ww_maxorXw_min<Ww_min)and(Xw_max>Ww_maxorXw_max<Ww_min)]；
3) intersection criterion: while the calculating event being unsatisfactory for comprising criterion and phase from criterion is judged as intersection.
Further, the step 5 further includes judge polygonal region that a certain element and profile set of vertices are constituted several
What relationship, the judgment rule of the geometrical relationship are as follows:
1) it is located at the outer criterion of polygonal region: makees horizontally or vertically ray from target point, calculates cumulative ray in two directions
With the intersection point number of zone boundary, determine target point outside region if intersection point number is all even number；
In polygonal region 2) (criterion: making horizontally or vertically ray from target point, calculate cumulative ray in two directions with area
The intersection point number on domain boundary determines target point in region if intersection point number is all odd number；
3) criterion on the boundary of polygonal region: can be judged as comprising target point on side in ray and the intersection point of zone boundary
In boundary.
The beneficial effects of the present invention are:
The present invention seriously affects foreground application system when forming mass data for power grid GIS tradition backstage relevant database
Efficiency, provide one kind according to power grid grade, operational management unit based on, using power grid project as basic unit of storage
Data base administration framework, by conventional GIS system with power grid element be management granularity be promoted to power grid project be management granularity, pipe
The increase of reason granularity makes the extraction efficiency of power grid project data improve manyfold, reaches data management efficiency in practical applications
Practical level is arrived；Using manual retrieval and the presence of grid integrated data is calculated for existing grid-based management and project planning
The problem of, propose a set of gridding solution, can automatically, accurately calculate grid contents, make the various applications of gridding
Reach real time implementation operation level, grid of solving over handles the problems such as human cost height, the low, poor reliability of accuracy.
In addition, the retrieval scheme of project cluster uses business administration level attribute, power grid topological relation attribute, geographical relationship in the present invention
A variety of index technologies such as attribute (gridding), administrative region attribute, make the data retrieval speed of project cluster be greatly improved.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by written explanation
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is power grid hierarchical storage database schema schematic diagram in the present invention；
Fig. 3 is the preparation method schematic diagram of profile set of vertices parameter in the present invention；
Fig. 4 is the acquisition schematic diagram of grid bounding box in the present invention；
Fig. 5 is to realize the algorithm schematic diagram that project mass-election is shortlisted for and is eliminated in grid using Collision Detection in the present invention；
Fig. 6 is the schematic diagram that precisely geometrical relationship calculates in the present invention.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention
Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or coupling.Wording used herein
"and/or" includes one or more associated any cells for listing item and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, it will not be explained in an idealized or overly formal meaning.It should manage
Solution, in order to enable technical solution is definitely, " front, back, left, right, up, down " used herein etc. indicates that the term in orientation is
Relative to the term position of Fig. 1, not because of the conversion changing location form of presentation of view.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
Attached drawing, the technical solution of the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on described the embodiment of the present invention, ordinary skill
Personnel's every other embodiment obtained, shall fall within the protection scope of the present invention.
As shown in Figure 1, the method for realizing grid-based management using power grid hierarchical storage database schema, including following step
It is rapid:
Step 1, the natural characteristic according to electric network composition, to being carried out point using the contents of a project as the project volume data of separate storage body etc.
Grade, data base administration in subregional, and project volume data is stored and transmitted using densification format；
Step 2, each project volume data include the operational management parameter of the predefined various power grid elements of data base management system
And geographic information data, the associated calculation method of project volume data are automatically performed the electric topology of project needs, electrical parameter statistics
It is calculated with geometric parameter；
Step 3, the mesh-managing parameter that various types and rank are defined according to regulatory requirement, calculate grids at different levels automatically
The geometric parameter of nested management attribute and grid；
Step 4, the geometric parameter in conjunction with grid and data base management system mean terms purpose mesh-managing parameter utilize geometrical plane
Enter option in Collision Detection mass-election grid, to greatly improve the rapidity, validity and overall efficiency of grid computing；
Project carries out intersection in step 5, the grid being selected in mass-election and comprising calculating, accurate calculation goes out the power grid for including in grid
Project and electrical elements carry out statistics calculating to a variety of mesh parameters.
In the step 1, the natural characteristic of electric network composition includes grade and operational management.
As shown in Fig. 2, being power grid hierarchical storage database schema schematic diagram, in the step 1, project volume data is deposited
Storage scheme is as follows:
Data base management system manages multiple entity Grids simultaneously, and each entity Grid forms a partition holding,
Each partition holding is a unit service example of data base management system, and is responsible for account in this subregion, status project, rule
Project, whole management roles of grid system are drawn, opens up different storage sub-districts respectively according to item types in each subregion, respectively
Project memory bank uses file densification storage format, and file name associated item meaning, and extension name is unified to use " .geplan "
Suffix.
As shown in figure 3, be the preparation method schematic diagram of profile set of vertices parameter, in the step 3, mesh-managing parameter
Calculate geometric area, geometry bounding box, geometric center, radius of electricity supply and profile set of vertices parameter including geographical face domain.
The profile set of vertices gain of parameter method is as follows:
A. the geometric coordinate scatter plot arrangement for marking project interior element, is YS0-YS7；
B. a border element YS0 is arbitrarily extracted as first starting point, then horizontal rays to the right, later rotary irradiating counterclockwise
Line is then first element with the element YS3 of ray intersection；
C. using first element YS3 as second starting point, second element YS4 then is obtained in the method for step b, with such
Cycle operation is pushed away, to terminate operation when first starting point YS0, is then obtained during cycle operation until with the element of ray intersection
Each starting point (YS0YS3YS4YS7YS6) be project geometric surface domain profile set of vertices.
In the step 2, the geometric parameter of grid calculates the parameter including grid bounding box, profile set of vertices and calculates.
As shown in figure 4, being the acquisition schematic diagram of grid bounding box, oabcd is polygon vertex group, several in the project of acquisition
In the profile set of vertices in what face domain, profile set of vertices is surrounded with the square of a continuous toe-in in four sides, each side is for the first time
Stop convergence when encountering vertex, all terminating square when convergence is the grid bounding box, the angle steel joint coordinate of square
The as described grid bounding box coordinate using upper left (JWmin_Max) and bottom right (JWmax_min) set of coordinates is of the invention in figure
The bounding box parameter used；Shape changeable is decomposed into △ 1, △ 2, △ 3 ... △ n by vertex of o in figure and forms triangle sector.Benefit
Calculate each edge lengths with point-to-point transmission length formula (see Practical Formula 1), using edge lengths each known to triangle quadrature formula (see
Practical Formula 2) each triangle area is calculated, finally calculate gross area Sz=∑ △ s1 ... △ sn.
Practical Formula 1: ((lat1, lng1), B (lat2, lng2) two o'clock latitude and longitude coordinates calculate distance Lab to known A
Enabling R is earth radius constant R=6378.137
π/180 r1=lat1* are enabled to enable π/180 r2=lat2*
A=π/180 (lat1-lat2) * are enabled to enable b=π/180 (lng1-lng2) *
Enable c=2*Sin (Sqrt (Pow (Sin (a/2), 2)+Cos (r1) * Cos (r2) * Pow (Sin (b/2), 2)))
Then Lab=c*R；
Practical Formula 2: known each side length a of triangle, b, c quadrature Sabc
Enable a2=a*a that b2=b*b is enabled to enable c2=c*c
Enable d=a2+c2-b2
Then Sabc=0.25*Sqrt (Abs (4*a2*c2-d*d)).
As shown in figure 5, for the algorithm schematic diagram be shortlisted for and eliminated using project mass-election in Collision Detection realization grid；
It is as follows using the method for entering option in geometrical plane Collision Detection mass-election grid: assuming that grid packet in the step 4
Enclosing box top-left coordinates parameter is (Wj_min, Ww_max), and lower right coordinate parameter is (Wj_max, Ww_min), and any project is surrounded
Box top-left coordinates parameter is (Xj_min, Xw_max), and lower right coordinate parameter is (Xj_max, Xw_min), crash type detection
Algorithm criterion are as follows:
It 1) include criterion
[(Wj_min<Xj_min<Wj_max)and(Wj_min<Xj_max<Wj_max)]and[(Ww_min<Xw_min<Ww_
max)and(Ww_min<Xw_max<Ww_max)]；
2) mutually from criterion
[(Xj_min>Wj_maxorXj_min<Wj_min)and(Xj_max>Wj_maxorXj_max<Wj_min)]or[(Xw_
min>Ww_maxorXw_min<Ww_min)and(Xw_max>Ww_maxorXw_max<Ww_min)]；
3) intersection criterion: while the calculating event being unsatisfactory for comprising criterion and phase from criterion is judged as intersection.
As shown in fig. 6, realizing the original that accurate geometrical relationship calculates for geometric surface domain and element ray intersection odd-even symmetry method
Reason figure, the step 5 further includes the geometrical relationship for the polygonal region for judging that a certain element and profile set of vertices are constituted, described several
The judgment rule of what relationship is as follows:
Irregular polygon is the polygonal region that grid or project profile set of vertices are constituted in figure, A, B, C, D be to judge with
The element apex coordinate of polygon geometrical relationship, the judgment rule of geometrical relationship are as follows: 1) polygon outer (A, D point in figure) is sentenced
According to making horizontally or vertically ray from target point, the cumulative ray intersection point number with zone boundary in two directions calculated, if handing over
Point number is all that even number (noticing that 0 is even number) then determines target point outside region；2) (C point in figure) criterion in polygon, from mesh
Punctuate makees horizontally or vertically ray, the cumulative ray intersection point number with zone boundary in two directions is calculated, if intersection point number
All then determine target point in region for odd number；3) it is wrapped in the intersection point of (B point in the figure) criterion on boundary, ray and zone boundary
It can be judged as on boundary containing target point, the present invention is in order to improve the accuracy comprising content, and element is used as on boundary
It is handled in region.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, this field is common
Other modifications or equivalent replacement that technical staff makes technical solution of the present invention, without departing from technical solution of the present invention
Spirit and scope, be intended to be within the scope of the claims of the invention.
Claims (9)
1. the method for realizing grid-based management using power grid hierarchical storage database schema, which comprises the following steps:
Step 1, the natural characteristic according to electric network composition, to being carried out point using the contents of a project as the project volume data of separate storage body etc.
Grade, data base administration in subregional, and project volume data is stored and transmitted using densification format；
Step 2, each project volume data include the operational management parameter of the predefined various power grid elements of data base management system
And geographic information data, the associated calculation method of project volume data are automatically performed the electric topology of project needs, electrical parameter statistics
It is calculated with geometric parameter；
Step 3, the mesh-managing parameter that various types and rank are defined according to regulatory requirement, calculate grids at different levels automatically
The geometric parameter of nested management attribute and grid；
Step 4, the geometric parameter in conjunction with grid and data base management system mean terms purpose mesh-managing parameter utilize geometrical plane
Enter option in Collision Detection mass-election grid, to greatly improve the rapidity, validity and overall efficiency of grid computing；
Project carries out intersection in step 5, the grid being selected in mass-election and comprising calculating, accurate calculation goes out the power grid for including in grid
Project and electrical elements carry out statistics calculating to a variety of mesh parameters.
2. the method according to claim 1 for realizing grid-based management using power grid hierarchical storage database schema, special
Sign is: in the step 1, the natural characteristic of electric network composition includes grade and operational management.
3. the method according to claim 2 for realizing grid-based management using power grid hierarchical storage database schema, special
Sign is, in the step 1, the storage scheme of project volume data is as follows:
Data base management system manages multiple entity Grids simultaneously, and each entity Grid forms a partition holding,
Each partition holding is a unit service example of data base management system, and is responsible for account in this subregion, status project, rule
Project, whole management roles of grid system are drawn, opens up different storage sub-districts respectively according to item types in each subregion, respectively
Project memory bank uses file densification storage format, and file name associated item meaning, and extension name is unified to use " .geplan "
Suffix.
4. the method according to claim 1 for realizing grid-based management using power grid hierarchical storage database schema, special
Sign is: in the step 3, it includes the geometric area in geographical face domain, geometry bounding box, in geometry that mesh-managing parameter, which calculates,
The heart, radius of electricity supply and profile set of vertices parameter.
5. the method according to claim 4 for realizing grid-based management using power grid hierarchical storage database schema, special
Sign is that the profile set of vertices gain of parameter method is as follows:
A. the geometric coordinate scatter plot arrangement of project interior element is marked；
B. a border element is arbitrarily extracted as first starting point, then makees horizontal/vertical ray to right/left, later the inverse time
Needle/rotate clockwise ray is then first element with the element of ray intersection；
C. using first element as second starting point, then obtain second element in the method for step b, and so on circulation
Operation terminates operation when being first starting point with the element of ray intersection, then each starting point obtained in cycle operation process
The as profile set of vertices in project geometric surface domain.
6. the method according to claim 5 for realizing grid-based management using power grid hierarchical storage database schema, special
Sign is: in the step 2, the geometric parameter of grid calculates the parameter including grid bounding box, profile set of vertices and calculates.
7. the method according to claim 6 for realizing grid-based management using power grid hierarchical storage database schema, special
Sign is: in the profile set of vertices in the project geometric surface domain of acquisition, being surrounded with the square of a continuous toe-in in four sides
Profile set of vertices, each side stop convergence when encountering vertex for the first time, terminate square when convergence all as grid encirclement
Box, the angle steel joint coordinate of square are the grid bounding box coordinate.
8. the method according to claim 7 for realizing grid-based management using power grid hierarchical storage database schema, special
Sign is: as follows using the method for entering option in geometrical plane Collision Detection mass-election grid in the step 4: false
If grid bounding box top-left coordinates parameter is (Wj_min, Ww_max), lower right coordinate parameter is (Wj_max, Ww_min), any
Project bounding box top-left coordinates parameter is (Xj_min, Xw_max), and lower right coordinate parameter is (Xj_max, Xw_min), collides class
The algorithm criterion of type detection are as follows:
It 1) include criterion
[(Wj_min<Xj_min<Wj_max)and(Wj_min<Xj_max<Wj_max)]and[(Ww_min<Xw_min<Ww_
max)and(Ww_min<Xw_max<Ww_max)]；
2) mutually from criterion
[(Xj_min>Wj_maxorXj_min<Wj_min)and(Xj_max>Wj_maxorXj_max<Wj_min)]or[(Xw_
min>Ww_maxorXw_min<Ww_min)and(Xw_max>Ww_maxorXw_max<Ww_min)]；
3) intersection criterion: while the calculating event being unsatisfactory for comprising criterion and phase from criterion is judged as intersection.
9. the method according to claim 8 for realizing grid-based management using power grid hierarchical storage database schema, special
Sign is: the step 5 further includes the geometrical relationship for the polygonal region for judging that a certain element and profile set of vertices are constituted, described
The judgment rule of geometrical relationship is as follows:
1) it is located at the outer criterion of polygonal region: makees horizontally or vertically ray from target point, calculates cumulative ray in two directions
With the intersection point number of zone boundary, determine target point outside region if intersection point number is all even number；
In polygonal region 2) (criterion: making horizontally or vertically ray from target point, calculate cumulative ray in two directions with area
The intersection point number on domain boundary determines target point in region if intersection point number is all odd number；
3) criterion on the boundary of polygonal region: can be judged as comprising target point on side in ray and the intersection point of zone boundary
In boundary.
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| CN111415346A (en) * | 2020-03-23 | 2020-07-14 | 河海大学 | Particle model damage characterization method based on gridding |
| CN112596814A (en) * | 2020-12-24 | 2021-04-02 | 北京百度网讯科技有限公司 | Method, apparatus, device, medium and program product for integrated packaging of items |
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