CN113535686A - Global geography grid system based on differential geometry principle and model construction method - Google Patents
Global geography grid system based on differential geometry principle and model construction method Download PDFInfo
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Abstract
The invention relates to the technical field of data processing, in particular to a global geogrid network system based on a differential geometry principle, which comprises the following components: the system comprises a core model module, a data management module, a progressive transmission module and a visualization module; the core model module is used for realizing an SQT subdivision model and a UEC coding model of the regular twenty-face triangular grid, realizing an adjacency relation search algorithm and a grid element hierarchical relation search algorithm among grid elements through the UEC coding model, and constructing a global geography gridding object model based on the adjacency relation search algorithm and the grid element hierarchical relation search algorithm; the data management module is used for providing a related management function of data of the global geography gridding object model, realizing the integration of GIS traditional vector data on the gridding object model through a rapid conversion algorithm of geography coordinates and grid codes and vector data gridding of the maintained topological relation, and storing the gridding object model data into a document type database for management. The problem that the global geogrid network model is easy to have slow response is solved.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a global geography grid system based on differential geometry principle and a model construction method.
Background
The global geography grid system is an effective frame which directly divides the earth surface, avoids various deformation generated by map projection, and carries out unified standard expression, management and analysis on the geography space data of any range and scale of the world and integrates multi-element heterogeneous data. However, expressing and managing relatively independent geoentity object data has been a difficult problem in the field of global geography grid system research. At present, the geographic data organization and management in the GIS field generally describes geographic entities or phenomena in the real world on the basis of some spatial data model, and macroscopically considers that the geographic space is formed by the spatial data model. The object conceptual model for abstract expression of the geographic entity can be mainly divided into two categories, namely an object model based on lattice enumeration and an object model based on a space coordinate, in a logic layer according to different description modes of space geometric information.
An object model based on cell enumeration discretizes geographic entities into a mesh, using enumeration of the cells of the mesh to directly express the geographic entities. The model can perform correlation calculation of the geographic entity from an algebraic level by virtue of the characteristics of the lattice coding, is high in calculation efficiency, supports multiple resolutions, and therefore the geographic entity is generally discretized into the global discrete grid for representation. But because all cell codes expressing the geographic entity are stored, the occupied storage space is large. The object model based on the space coordinates uses the space coordinate set to represent the geometric characteristics of the geographic entity, only the position coordinates of the key end points are stored, the storage space is saved, and the data precision is high. However, when performing the related calculation on the spherical surface, a large amount of spherical trigonometric functions are required, the calculation is complex, the oscillation is easy to occur, and the method is inconvenient, and a large amount of time is required for converting the object model based on the space coordinates into the object model based on the lattice enumeration in real time. Therefore, in the global discrete grid system, how to consider the storage space and the calculation efficiency to express relatively independent geographic entity objects is a dilemma.
Through analysis, the root cause of the problem is that the object model based on cell enumeration does not utilize the multi-resolution hierarchical characteristics of the global grid system when expressing and storing the geographic entity objects, so that the storage volume is huge. In addition, when the object model based on the spatial coordinates is converted into the object model based on the cell enumeration, the efficiency is low, various distortions may occur in the conversion result, the conversion result does not conform to the geographical law, and the erroneous recognition of the geographical space is easily caused.
Under these circumstances, a vector data gridding method that considers a multi-resolution gridded object model, a fast conversion algorithm of geographic coordinates and grid coding, and a maintained topological relationship is disclosed in a document entitled "geographic object model and key technology research based on global discrete grids" (jiffy). And on the basis, a prototype system for realizing the technology is also disclosed. The prototype system comprises: the model comprises a core model module, a data management module, a progressive transmission module and a visualization module, wherein the core model module is the basis of a prototype system, the module realizes an SQT subdivision model and a UEC coding model of a regular twenty-face triangular grid, realizes an adjacency relation search algorithm and a grid element hierarchical relation search algorithm among grid elements through the UEC coding model, and reconstructs a gridded object model based on the adjacency relation search algorithm and the grid element hierarchical relation search algorithm. The data management module provides the related management function of the gridding object model data, realizes the integration of GIS traditional vector data on the gridding object model through the rapid conversion algorithm of geographic coordinates and grid codes and the gridding of vector data maintaining topological relation, and stores the gridding object model data into a document database for management. The progressive transmission module provides a network on-demand progressive transmission function of the gridding object model data, and comprises a server and a client, wherein the client requests the gridding object model data from the server according to the user demand, and the server acquires the corresponding data from the database and returns the corresponding data to the client according to the demand sent by the client. The visualization module browses scenes of any scale in any global range by using a three-dimensional image rendering engine and provides a visualization display function of gridding object model data in related scene areas.
When the three-dimensional image rendering engine is used specifically, the progressive transmission module provides a network on-demand progressive transmission function of gridding object model data, and then the visualization module utilizes the three-dimensional image rendering engine to browse scenes in any scale in any range around the world. In the process, the data provided by the server to the user each time is based on the requirements of the user, the user has a long waiting time in the using process, the user directly feels that the jamming is serious, and particularly, under the condition that the server is in a heavy load, the model in the visualization module cannot respond to the operation after the user performs the relevant operation. However, there is a certain continuity of operation in the use process of the actual user, for example, when scaling is performed, repeated instructions are usually provided, but in the above system, the slow response of the model is very easy to occur due to the limitation of server load and network load.
Disclosure of Invention
The invention provides a global geography grid system based on differential geometry principle and a model construction method thereof, which are used for solving the problem that a global geography grid model is easy to have slow response.
In order to solve the technical problem, the present application provides the following technical solutions:
a global geographic mesh system based on differential geometry principles, comprising: the system comprises a core model module, a data management module, a progressive transmission module and a visualization module;
the core model module is used for realizing an SQT subdivision model and a UEC coding model of the regular twenty-face triangular grid, realizing an adjacency relation search algorithm and a grid element hierarchical relation search algorithm among grid elements through the UEC coding model, and constructing a global geography gridding object model based on the adjacency relation search algorithm and the grid element hierarchical relation search algorithm;
the data management module is used for providing a related management function of data of the global geography gridding object model, realizing the integration of GIS traditional vector data on the gridding object model through a rapid conversion algorithm of geographic coordinates and grid codes and vector data gridding keeping topological relation, and storing the gridding object model data into a document type database for management;
the progressive transmission module comprises a server and a client, the client is used for determining an extensibility requirement according to the type of a user requirement, combining the user requirement and the extensibility requirement into a request requirement and then sending the request requirement to the server, the server is used for acquiring first data corresponding to the user requirement from a database according to the request requirement sent by the client and returning the first data to the client, and after feedback of the first data is successfully received and fed back by the client, second data corresponding to the extensibility requirement is sent to the client;
the visualization module is used for browsing scenes of any scale in any range of the world by using a three-dimensional image rendering engine and providing a visualization display function of the global geography gridding object model in the scene area corresponding to the first data;
the client is further used for judging whether the data corresponding to the new demand is contained in the second data or not when the new demand proposed by the user is received, and if the judgment result is yes, directly calling third data corresponding to the new demand from the second data and sending the third data to the visualization module to be displayed as a result; and if the judgment result is negative, sending the new demand to the server, calling fourth data similar to the new demand trend from the second data, and sending the fourth data to the visualization module to be used as transition animation display.
Further, the user requirement is one of a data set name request, an object geometric information request or an operation request of the global geographic grid model; when the user requirement is a data set name request, the extensibility requirement is a data set name which is similar to the data set name and is adjacent to the data set; when the user requirement is an object geometric information request, the ductility requirement is that an object adjacent to the object is similar; when the user requirement is an operation request of the global geogrid network model, the extensibility requirement is repetition of the operation request or vice versa.
Further, the server sends data to the client in a json file form.
Further, the client sends data to the server in an HTTP request mode.
Further, the three-dimensional image rendering engine takes a triangular patch as a basic primitive for drawing.
The method for constructing the global geography grid model based on the differential geometry principle comprises the following steps:
s1, acquiring a SQT subdivision model and a UEC coding model of the regular twenty-face triangular grid, realizing an adjacency relation search algorithm and a grid element hierarchical relation search algorithm among grid elements through the UEC coding model, and constructing a global geography gridding object model based on the adjacency relation search algorithm and the grid element hierarchical relation search algorithm;
s2, integrating GIS traditional vector data on a gridded object model through a rapid conversion algorithm of geographic coordinates and grid codes and vector data gridding keeping topological relation, and storing gridded object model data into a document database for management;
s3, the client determines the extensibility requirement according to the type of the user requirement, combines the user requirement and the extensibility requirement into a request requirement and sends the request requirement to the server, then the server obtains first data corresponding to the user requirement from the database according to the request requirement sent by the client and returns the first data to the client, and after feedback of the first data is successfully received and fed back by the client, second data corresponding to the extensibility requirement is sent to the client;
s4, browsing scenes in any scale in any range around the world by using a three-dimensional image rendering engine, and providing a visual display function of the global geography gridding object model in the scene area corresponding to the first data;
s5, when a new requirement proposed by a user is received, judging whether the data corresponding to the new requirement is contained in the second data, if so, directly calling third data corresponding to the new requirement from the second data and utilizing a three-dimensional image rendering engine to display the third data as a result; and if the judgment result is negative, sending the new demand to the server, calling fourth data similar to the new demand trend from the second data, and using a three-dimensional image rendering engine to serve as transition animation display.
Further, the user requirement is one of a data set name request, an object geometric information request or an operation request of the global geographic grid model; when the user requirement is a data set name request, the extensibility requirement is a data set name which is similar to the data set name and is adjacent to the data set; when the user requirement is an object geometric information request, the ductility requirement is that an object adjacent to the object is similar; when the user requirement is an operation request of the global geogrid network model, the extensibility requirement is repetition of the operation request or vice versa.
Further, the three-dimensional image rendering engine takes a triangular patch as a basic primitive for drawing.
The principle and the advantages of the scheme are as follows: in the aspect of model construction, the rapid conversion algorithm of the geographic coordinates and the grid codes can improve the integration efficiency. Multi-resolution representation of the geobody object can be realized, and the storage space required by the geobody object is effectively reduced.
On the other hand, the method and the device can generate the ductility requirement based on the original requirement of the user, and ensure that the data corresponding to the original requirement can be timely corresponding when the server feeds back information to the client. When the user views the data corresponding to the original requirement, the server can feed back the data corresponding to the ductility requirement to the client side, so that the user can conveniently display the data when performing the next operation. The method can realize the prediction of user requirements under the condition of a certain probability, is timely and corresponding, and can be used as a transition animation after a user puts forward a new requirement when the prediction is not successful, thereby ensuring the fluency of a user perception level, ensuring the user experience, and solving the problem that the global geography grid model is easy to have slow response.
Drawings
Fig. 1 is a front/cross-sectional view of a first embodiment of a differential geometry-based global geographic grid system and model construction method.
Detailed Description
The following is further detailed by way of specific embodiments:
example one
The global geographic grid system based on differential geometry principle of the present embodiment (as shown in fig. 1) comprises: the system comprises a core model module, a data management module, a progressive transmission module and a visualization module;
the core model module is used for realizing an SQT subdivision model and a UEC coding model of the regular twenty-face triangular grid, realizing an adjacency relation search algorithm and a grid element hierarchical relation search algorithm among grid elements through the UEC coding model, and constructing a global geography gridding object model based on the adjacency relation search algorithm and the grid element hierarchical relation search algorithm;
the data management module is used for providing a related management function of data of the global geography gridding object model, realizing the integration of GIS traditional vector data on the gridding object model through a rapid conversion algorithm of geographic coordinates and grid codes and vector data gridding keeping topological relation, and storing the gridding object model data into a document type database for management;
the progressive transmission module comprises a server and a client, the client is used for determining an extensibility requirement according to the type of a user requirement, combining the user requirement and the extensibility requirement into a request requirement and then sending the request requirement to the server, the server is used for acquiring first data corresponding to the user requirement from a database according to the request requirement sent by the client and returning the first data to the client, and after feedback of the first data is successfully received and fed back by the client, second data corresponding to the extensibility requirement is sent to the client;
the visualization module is used for browsing scenes of any scale in any range of the world by using a three-dimensional image rendering engine and providing a visualization display function of the global geography gridding object model in the scene area corresponding to the first data;
the client is further used for judging whether the data corresponding to the new demand is contained in the second data or not when the new demand proposed by the user is received, and if the judgment result is yes, directly calling third data corresponding to the new demand from the second data and sending the third data to the visualization module to be displayed as a result; and if the judgment result is negative, sending the new demand to the server, calling fourth data similar to the new demand trend from the second data, and sending the fourth data to the visualization module to be used as transition animation display. Specifically, the three-dimensional image rendering engine is a basic primitive which takes a triangular patch as drawing
The method for constructing the global geography grid model based on the differential geometry principle comprises the following steps:
s1, acquiring a SQT subdivision model and a UEC coding model of the regular twenty-face triangular grid, realizing an adjacency relation search algorithm and a grid element hierarchical relation search algorithm among grid elements through the UEC coding model, and constructing a global geography gridding object model based on the adjacency relation search algorithm and the grid element hierarchical relation search algorithm;
s2, integrating GIS traditional vector data on a gridded object model through a rapid conversion algorithm of geographic coordinates and grid codes and vector data gridding keeping topological relation, and storing gridded object model data into a document database for management;
s3, the client determines the extensibility requirement according to the type of the user requirement, combines the user requirement and the extensibility requirement into a request requirement and sends the request requirement to the server, then the server obtains first data corresponding to the user requirement from the database according to the request requirement sent by the client and returns the first data to the client, and after feedback of the first data is successfully received and fed back by the client, second data corresponding to the extensibility requirement is sent to the client;
s4, browsing scenes in any scale in any range around the world by using a three-dimensional image rendering engine, and providing a visual display function of the global geography gridding object model in the scene area corresponding to the first data;
s5, when a new requirement proposed by a user is received, judging whether the data corresponding to the new requirement is contained in the second data, if so, directly calling third data corresponding to the new requirement from the second data and utilizing a three-dimensional image rendering engine to display the third data as a result; and if the judgment result is negative, sending the new demand to the server, calling fourth data similar to the new demand trend from the second data, and using a three-dimensional image rendering engine to serve as transition animation display.
The user requirement is one of a data set name request, an object geometric information request or an operation request of the global geographic grid model; when the user requirement is a data set name request, the extensibility requirement is a data set name which is similar to the data set name and is adjacent to the data set; when the user requirement is an object geometric information request, the ductility requirement is that an object adjacent to the object is similar; when the user requirement is an operation request of the global geogrid network model, the extensibility requirement is repetition of the operation request or vice versa.
In specific use, the prototype system selects C + + as a basic development language in consideration of the operation efficiency of the system. In terms of hardware development environment, the main hardware configuration of the prototype system is as follows: the CPU is Intel (R) core (TM) i7-7700, 3.60GHz, and the display card is GeForceGTX960, 8GB memory, 1TB mechanical hard disk. In the aspect of software development environment, an operating system is Windows10 enterprise edition 64 bit, integrated development environments are Microsoft visual studio Community2017 and visual C + +2017, and a GUI (graphical user interface) interface is realized based on a cross-platform Qt development framework.
The core model module is realized, and under a longitude and latitude coordinate system, a continuous spherical space on the earth surface is torn, and the problem of crossing 180-degree longitude lines is not beneficial to the construction of a global discrete grid system. Therefore, in the core model module, the geometric position on the spherical surface is expressed in a three-dimensional rectangular coordinate system with the sphere center as the origin, so that the problems of pole singularity and 180-degree-crossing longitude are avoided.
Under the three-dimensional rectangular coordinate, after determining the vertex of the initial grid, the SQT subdivision model sequentially determines the midpoints of the great arcs through the geometric calculation of a three-dimensional space to perform spherical recursive subdivision, and then the implementation can be realized. Meanwhile, in the recursive subdivision process of constructing the grid, all the constituent elements in the grid system are coded and marked by using a coding method of a UEC coding model, so that the one-to-one correspondence relationship between the UEC coding and the grid constituent elements is realized.
And the data management module is used for realizing the two-way rapid conversion algorithm of the geographic coordinates and the UEC grid codes, and realizing the vector data grid method for keeping the topological relation based on the rapid conversion algorithm, thereby realizing the integration of the GIS traditional vector data on the grid object model. The reading and analysis of the original vector data are realized through a GDAL library, and the query of the topological relation among the original vector data is realized through a GEOS library.
And selecting a typical document type database MongoDB for persistent storage of the integrated gridding object model data. And according to the physical storage document structure of the grid-like model in the second chapter, combining a C + + interface provided by MongoDB to realize persistent storage of data. Meanwhile, in order to improve the query and retrieval efficiency of data, a more common R tree spatial index method in a spatial database is used for organizing and indexing the gridded object model data stored in the MongoDB database.
In a specific use, if a user makes an operation request for enlarging the global geography gridding object model through the client, and the operation request is defined as an original request, the client simultaneously generates an extensibility requirement, and the extensibility requirement is based on the repetition of the original request or the opposite, and the extensibility requirement continues to be enlarged or reduced (similarly, the original request can be translated left and right, etc.). When a user puts forward a new demand, if the new demand of the user is amplification, the embodiment can directly call the local data to complete timely response. If the new demand is left translation, the new demand trend is close to amplification (the amplification can bring the result after the left translation into the display), and at the moment, the change of the global geography gridding object model corresponding to the request for amplification is displayed to the user as transition animation, so that the fluency of the user perception level is ensured, and the user experience is ensured.
The above are merely examples of the present invention, and the present invention is not limited to the field related to this embodiment, and the common general knowledge of the known specific structures and characteristics in the schemes is not described herein too much, and those skilled in the art can know all the common technical knowledge in the technical field before the application date or the priority date, can know all the prior art in this field, and have the ability to apply the conventional experimental means before this date, and those skilled in the art can combine their own ability to perfect and implement the scheme, and some typical known structures or known methods should not become barriers to the implementation of the present invention by those skilled in the art in light of the teaching provided in the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. A global geographic mesh system based on differential geometry principles, comprising: the system comprises a core model module, a data management module, a progressive transmission module and a visualization module;
the core model module is used for realizing an SQT subdivision model and a UEC coding model of the regular twenty-face triangular grid, realizing an adjacency relation search algorithm and a grid element hierarchical relation search algorithm among grid elements through the UEC coding model, and constructing a global geography gridding object model based on the adjacency relation search algorithm and the grid element hierarchical relation search algorithm;
the data management module is used for providing a related management function of data of the global geography gridding object model, realizing the integration of GIS traditional vector data on the gridding object model through a rapid conversion algorithm of geographic coordinates and grid codes and vector data gridding keeping topological relation, and storing the gridding object model data into a document type database for management;
the progressive transmission module comprises a server and a client, the client is used for determining an extensibility requirement according to the type of a user requirement, combining the user requirement and the extensibility requirement into a request requirement and then sending the request requirement to the server, the server is used for acquiring first data corresponding to the user requirement from a database according to the request requirement sent by the client and returning the first data to the client, and after feedback of the first data is successfully received and fed back by the client, second data corresponding to the extensibility requirement is sent to the client;
the visualization module is used for browsing scenes of any scale in any range of the world by using a three-dimensional image rendering engine and providing a visualization display function of the global geography gridding object model in the scene area corresponding to the first data;
the client is further used for judging whether the data corresponding to the new demand is contained in the second data or not when the new demand proposed by the user is received, and if the judgment result is yes, directly calling third data corresponding to the new demand from the second data and sending the third data to the visualization module to be displayed as a result; and if the judgment result is negative, sending the new demand to the server, calling fourth data similar to the new demand trend from the second data, and sending the fourth data to the visualization module to be used as transition animation display.
2. The differential geometry principles-based global geography grid system and model construction method according to claim 1, wherein: the user requirement is one of a data set name request, an object geometric information request or an operation request of the global geographic grid model; when the user requirement is a data set name request, the extensibility requirement is a data set name which is similar to the data set name and is adjacent to the data set; when the user requirement is an object geometric information request, the ductility requirement is that an object adjacent to the object is similar; when the user requirement is an operation request of the global geogrid network model, the extensibility requirement is repetition of the operation request or vice versa.
3. The differential geometry principles-based global geography grid system and model construction method according to claim 2, wherein: and the server sends data to the client in a json file mode.
4. The differential geometry principles-based global geography grid system and model construction method according to claim 3, wherein: and the client sends data to the server in an HTTP request mode.
5. The differential geometry principles-based global geography grid system and model construction method according to claim 4, wherein: the three-dimensional image rendering engine takes a triangular patch as a basic primitive for drawing.
6. The method for constructing the global geography grid model based on the differential geometry principle comprises the following steps:
s1, acquiring a SQT subdivision model and a UEC coding model of the regular twenty-face triangular grid, realizing an adjacency relation search algorithm and a grid element hierarchical relation search algorithm among grid elements through the UEC coding model, and constructing a global geography gridding object model based on the adjacency relation search algorithm and the grid element hierarchical relation search algorithm;
s2, integrating GIS traditional vector data on a gridded object model through a rapid conversion algorithm of geographic coordinates and grid codes and vector data gridding keeping topological relation, and storing gridded object model data into a document database for management;
s3, the client determines the extensibility requirement according to the type of the user requirement, combines the user requirement and the extensibility requirement into a request requirement and sends the request requirement to the server, then the server obtains first data corresponding to the user requirement from the database according to the request requirement sent by the client and returns the first data to the client, and after feedback of the first data is successfully received and fed back by the client, second data corresponding to the extensibility requirement is sent to the client;
s4, browsing scenes in any scale in any range around the world by using a three-dimensional image rendering engine, and providing a visual display function of the global geography gridding object model in the scene area corresponding to the first data;
s5, when a new requirement proposed by a user is received, judging whether the data corresponding to the new requirement is contained in the second data, if so, directly calling third data corresponding to the new requirement from the second data and utilizing a three-dimensional image rendering engine to display the third data as a result; and if the judgment result is negative, sending the new demand to the server, calling fourth data similar to the new demand trend from the second data, and using a three-dimensional image rendering engine to serve as transition animation display.
7. The differential geometry principles-based global geography grid system and model construction method according to claim 6, wherein: the user requirement is one of a data set name request, an object geometric information request or an operation request of the global geographic grid model; when the user requirement is a data set name request, the extensibility requirement is a data set name which is similar to the data set name and is adjacent to the data set; when the user requirement is an object geometric information request, the ductility requirement is that an object adjacent to the object is similar; when the user requirement is an operation request of the global geogrid network model, the extensibility requirement is repetition of the operation request or vice versa.
8. The differential geometry principles-based global geography grid system and model construction method according to claim 7, wherein: the three-dimensional image rendering engine takes a triangular patch as a basic primitive for drawing.
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