CN111354084A - Network geographic information service system based on three-dimensional model tiles - Google Patents
Network geographic information service system based on three-dimensional model tiles Download PDFInfo
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- CN111354084A CN111354084A CN202010126252.4A CN202010126252A CN111354084A CN 111354084 A CN111354084 A CN 111354084A CN 202010126252 A CN202010126252 A CN 202010126252A CN 111354084 A CN111354084 A CN 111354084A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/05—Geographic models
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/26—Visual data mining; Browsing structured data
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/29—Geographical information databases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention discloses a network geographic information service system based on a three-dimensional model tile, which comprises a client, a structure database, a file database, a web server and a local cache server, wherein the client is connected with the structure database; the client is connected with the web server; the web server is connected to a structure database, a file database and a local cache server. According to the method, various visual data containing the three-dimensional model to be displayed are divided into tiles according to the organization structure through a slicing technology, address information is stored in the structure database, and the tile is connected with the file database and is combined with the local cache server when being called, so that the three-dimensional model in the view range can be loaded rapidly, the loading speed and efficiency of the three-dimensional model are improved, and meanwhile, a user group of the network geographic information service system has better user experience.
Description
Technical Field
The invention relates to the field of map service, in particular to a network geographic information service system based on a three-dimensional model tile.
Background
The Geographic Information System (GIS) is a comprehensive subject, has been widely used in various fields in combination with geography, cartography, remote sensing, and computer science, and is a computer System for inputting, storing, querying, analyzing, and displaying Geographic data, and in recent years, the GIS is also called "Geographic Information service". The three-dimensional GIS is used for representing and displaying data after collection, operation and analysis. Three-dimensional data can show objective reality more than two-dimensional data, because the display of spatial information is more intuitive, and the multi-dimensional spatial analysis function is also more powerful.
WebGL (Web Graphics library) is a 3D drawing protocol, the drawing technical standard allows JavaScript and OpenGL ES 2.0 to be combined together, and by adding one JavaScript binding of OpenGL ES 2.0, WebGL can provide hardware 3D accelerated rendering for HTML5 Canvas, so that Web developers can more smoothly display 3D scenes and models in a browser by means of a system display card, and complicated navigation and data visualization can be created. The WebGL technical standard eliminates the trouble of developing web page-specific rendering plug-ins, and can be used to create web site pages with complex 3D structures.
The three-dimensional model Tiles (3D Tiles) are three-dimensional model tile data structures that are built in conformity with the Open Geospatial Consortium (OGC) standard and based on the glTF model definition. The purpose of the 3D files is to transmit massive heterogeneous three-dimensional geospatial data sets. However, from a practical application perspective, the use of 3D Tiles is much greater than originally expected; the definition of the three-dimensional model Tiles by the 3D Tiles can be used for tiling any three-dimensional data. Currently, in addition to geospatial datasets, 3D Tiles can also represent tiled BIM (Building Information Model) data via LOD (level of detail Model). The potential application of 3D Tiles in GIS is as follows: massive buildings (appearance), massive three-dimensional terrains, BIM with complex structure, repeatable model examples (trees, facilities and the like), massive point clouds and massive vector data on three-dimensional spheres.
Disclosure of Invention
The invention aims to provide a network geographic information service system based on a three-dimensional model tile, and solves the problems that in the prior art, a 3D model is slow to load, low in efficiency and few in loading data types.
In order to solve the technical problems, the invention adopts the following technical scheme:
a network geographic information service system based on three-dimensional model tiles comprises a client, a structure database, a file database, a web server and a local cache server; the client is connected with the web server and used for sending a display request of the model data to the web server and receiving data information from the web server; the web server is connected with the structure database, the file database and the local cache server and used for receiving the request of the client, sending the request to the structure database and the file database according to the request of the client, receiving the network geographic information data in the structure database and the file database, sending the acquired network geographic information data to the client and caching the network geographic information data on the local cache server.
Preferably, the network geographic information data comprises terrain data, image data, point cloud data, oblique photography data, three-dimensional model data, refined model BIM and vector data.
Preferably, the network geographic information data is sliced by adopting a slicing technology and then stored in a structure database and a file database.
Preferably, the structure database is used for storing tile file addresses of terrain data, image data, point cloud data, oblique photography data, three-dimensional model data, refined model BIM and vector data after slicing through a slicing technology; the file database is used for storing the sliced tile set data and the tile files.
Preferably, the tile set data stores the spatial organization structure of all tile files; the tile file stores three-dimensional geographic information data for individual tiles, including model data and attribute data.
Preferably, the step of the system displaying the visualization model is:
s1: determining a storage mode according to the data model:
s2: slicing the data model by using a slicing technology;
s3: storing the tile data structure in a structure database;
s4: storing the tile file in a file database;
s5: loading slices according to the user view range;
s6: the model slice loaded in step S5 is cached locally.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by adopting a slicing technology, a plurality of data models such as terrain data, image data, point cloud data, oblique photography data, three-dimensional models, refined models BIM and vector data are sliced and stored in a database, and when a client needs to be called, the data are cached on a local cache server, so that the loading speed and efficiency of the model data are improved, and the user experience is increased.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a block diagram of the present invention, with reference to fig. 1: a three-dimensional model tile-based network geographic information service system, comprising: client, structure database, file database, web server, local cache server. The client is connected with the web server, the web server is connected with the structure database, the file database and the local cache server, the structure database is connected with the web server, and the file database is connected with the web server.
The structure database is used for slicing terrain data, image data, point cloud data, oblique photography data, three-dimensional models, refined models BIM, vector data and other models with various data types according to a space organization structure and storing tile file addresses by using a slicing technology. Upon receiving a request from the web server side, address information of the desired tile is returned. The spatial organization structure of the Data Model is divided into three levels, specifically, the first level is a tile type and comprises b3dm (Batched3D Model, batch 3D Model), i3dm (instant 3D Model, instance 3D Model), pnts (Point Cloud ), vctr (Vector Data), cmpt (Composite, Composite Data) and the like, the second level is a Model ID for calling, and the third level is a tile file corresponding to the Model.
And the file database stores the tile file according to an organization structure by utilizing the sqlite database. When a request from a web server side is received, a spatial organization structure of the tile files stored in the tile set data is found, and then the required tile files are returned according to the content in the tile set data.
The client side is responsible for sending model data display requests to the web server and receiving information from the web server side.
The web server side is responsible for receiving a client side request, sending the request to the structure database after processing and receiving tile address information returned by the structure database, then sending the request to the file database and receiving tile file information returned by the file database, sending the obtained data to the client side and caching the data on a local cache server.
The local cache server is responsible for caching data from the web server side, and displaying the data faster in later calling so as to improve the data loading speed and efficiency.
The system displays the visualization model by the steps of:
s1: determining a storage mode according to the data model: the data model comprises terrain data, image data, point cloud data, oblique photography data, three-dimensional model data, refined model BIM data and vector data. Determining a data model to be stored, slicing the data model, storing each sliced file (such as tile set data-tileset. json, tile data-b 3dm, i3dm, pnts, vctr, cmpt and the like) in a file database, and storing the address of each file in a structure database;
s2: slicing the data model by using a slicing technology; the method comprises the steps that a slicing technology is utilized, models of various data types are sliced according to model characteristics, binary elevation point information is stored in terrain tiles (such as three-dimensional terrain, three-dimensional point cloud data, BIM with a complex structure and the like), the data storage type is a hash format, folders are organized according to level/x/y.terrain, each slice stores an independent terrain file, a layer.json file is stored in a root directory, and image data (such as a vector model and the like) stores sliced pictures. The organization structure and the tile file address of each tile are stored in a structure database, and the tile files are stored in a sqlite file database according to the organization structure.
S3: storing the tile data structure in a structure database;
s4: storing the tile file in a file database;
s5: loading slices according to the user view range; during loading, an OOC (out Of core) algorithm is adopted to load tile data, only when data are loaded in a scene needing to be rendered, the tiles with the most recent requests are loaded firstly, the tiles with the least recent requests are removed preferentially, tiles around the current view are loaded in advance, and the required map tiles are cached on a local high-speed environment server, so that the processing efficiency and the processing speed Of model loading are improved.
S6: the model slice loaded in step S5 is cached locally.
While loading data, determining the scale level of model display according to the sight distance range: when the range of sight is more than 50km, the terrain elements are large-scale DEM data, when the range of sight is 5km-50km, the terrain elements are medium-scale DEM data, and when the range of sight is 1km-5km, the terrain elements are small-scale DEM data; when the sight distance interval is greater than 50km, the road elements are large-scale image data, when the sight distance interval is 5km-50km, the road elements are medium-scale DLG data, and when the sight distance interval is 1km-5km, the road elements are small-scale inclination model data; when the visual distance interval is greater than 50km, the residential area elements are large-scale image data, when the visual distance interval is 5km-50km, the residential area elements are mesoscale inclined model data, and when the visual distance interval is 1km-5km, the residential area elements are small-scale fine model data; when the sight distance interval is 200m-5km, the park site elements are medium-scale DOM and POI data, and when the sight distance interval is 10m-200m, the park site elements are small-scale tilt models, fine models and laser point cloud data; and when the sight distance interval is 2km-10km, the building elements are medium-scale POI data, and when the sight distance interval is 50m-2km, the building elements are small-scale tilt models and fine model data.
According to the transformation of the three-dimensional view field, the angle and the details of the model are automatically adjusted, and according to the height change of the view angle, the height view angle of the model is automatically adjusted: the specific implementation is that the spatial range, the visual angle height and the data precision are quantized into scale control factors to limit the scheduling of a scene to data, when the scene is initialized, the visual distance range is set through an editor, or a proper visual distance range is collected in a scene container through scene interaction, the plane boundary of a special scene is defined through the editor, the data exceeding the range are transmitted to business services in a coordinate mode in the spatial range, the data are refused to be scheduled or cut, and when the spatial range caused by three-dimensional visual field conversion and the visual angle height caused by visual angle adjustment are changed, the data are rescheduled.
The invention provides a web loading service for three-dimensional model tiles, and during loading, OOC (out Of core) algorithm is adopted to load tile data, so that elevation data which do not participate in drawing are eliminated before being loaded into a memory. And loading data only in a scene needing rendering, loading the tiles with the most recent requests, preferentially removing the tiles with the least recent requests, pre-loading the tiles around the current view, and caching the required map tiles on a local high-speed environment server, so that the processing efficiency and speed of model loading are improved.
According to the method, the scale level of model display is determined according to the sight distance range while data are loaded; automatically adjusting the angle and the details of the model according to the transformation of the three-dimensional view field; and automatically adjusting the height visual angle of the model according to the height change of the visual angle. And the grid is positioned through the view range, the index is determined, the tile data can be quickly searched, positioned and called, the fusion is carried out, and the model is integrally displayed. While calling data, if the local cache server has the needed data, the corresponding speed can be further accelerated. When the database is updated with tile data, the local cache server related data is updated when called. Thus, when a user needs a large amount of data to call, the pressure of the network and the client can be relieved.
According to the invention, by adopting a slicing technology, a plurality of data models such as terrain data, image data, point cloud data, oblique photography data, three-dimensional models, refined models BIM and vector data are sliced and stored in a database, and when a client needs to be called, the data are cached on a local cache server, so that the loading speed and efficiency of the model data are improved, and the user experience is increased.
Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (6)
1. A network geographic information service system based on three-dimensional model tiles is characterized in that: the system comprises a client, a structure database, a file database, a web server and a local cache server;
the client is connected with the web server and used for sending a display request of the model data to the web server and receiving data information from the web server;
the web server is connected with the structure database, the file database and the local cache server and used for receiving the request of the client, sending the request to the structure database and the file database according to the request of the client, receiving the network geographic information data in the structure database and the file database, sending the acquired network geographic information data to the client and caching the network geographic information data on the local cache server.
2. The three-dimensional model tile-based network geographic information service system of claim 1, wherein: the network geographic information data comprises terrain data, image data, point cloud data, oblique photography data, three-dimensional model data, a refined model BIM and vector data.
3. The three-dimensional model tile-based network geographic information service system of claim 2, wherein: and slicing the network geographic information data by adopting a slicing technology and storing the sliced data in a structure database and a file database.
4. The three-dimensional model tile-based network geographic information service system of claim 3, wherein: the structure database is used for storing tile file addresses of terrain data, image data, point cloud data, oblique photography data, three-dimensional model data, refined model BIM and vector data after slicing through a slicing technology; the file database is used for storing the sliced tile set data and the tile files.
5. The three-dimensional model tile-based network geographic information service system of claim 4, wherein: the tile set data stores the spatial organization structure of all tile files; the tile file stores three-dimensional geographic information data for individual tiles, including model data and attribute data.
6. The three-dimensional model tile-based network geographic information service system of claim 5, wherein: the system displays the visualization model by the steps of:
s1: determining a storage mode according to the data model:
s2: slicing the data model by using a slicing technology;
s3: storing the tile data structure in a structure database;
s4: storing the tile file in a file database;
s5: loading slices according to the user view range;
s6: the model slice loaded in step S5 is cached locally.
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| CN112905731A (en) * | 2021-03-29 | 2021-06-04 | 中国电建集团昆明勘测设计研究院有限公司 | IMU-GPS assisted linkage method for 360-degree panoramic photo and three-dimensional GIS scene |
| CN112966041A (en) * | 2021-02-02 | 2021-06-15 | 苍穹数码技术股份有限公司 | Data processing method, device, equipment and storage medium |
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| CN111986306A (en) * | 2020-08-11 | 2020-11-24 | 北京瑞晟成科技发展有限公司 | Integrated data display and simulation platform |
| CN112966041B (en) * | 2021-02-02 | 2024-04-26 | 苍穹数码技术股份有限公司 | Data processing method, device, equipment and storage medium |
| CN112966041A (en) * | 2021-02-02 | 2021-06-15 | 苍穹数码技术股份有限公司 | Data processing method, device, equipment and storage medium |
| CN112905731A (en) * | 2021-03-29 | 2021-06-04 | 中国电建集团昆明勘测设计研究院有限公司 | IMU-GPS assisted linkage method for 360-degree panoramic photo and three-dimensional GIS scene |
| CN112905731B (en) * | 2021-03-29 | 2022-07-19 | 中国电建集团昆明勘测设计研究院有限公司 | IMU-GPS assisted linkage method for 360-degree panoramic photo and three-dimensional GIS scene |
| CN113096006A (en) * | 2021-04-19 | 2021-07-09 | 上海跃影科技有限公司 | File synchronization method and system applied to holographic scene |
| CN113449162A (en) * | 2021-06-28 | 2021-09-28 | 广州极飞科技股份有限公司 | Point cloud data display system, method and device, storage medium and electronic equipment |
| CN113742505A (en) * | 2021-08-30 | 2021-12-03 | 武汉数趣信息科技有限公司 | Mass synthetic aperture radar interferometric measurement (InSAR) data online visualization method |
| CN114820967B (en) * | 2022-04-28 | 2022-09-27 | 四川见山科技有限责任公司 | Layered image data real-time drawing method and system |
| CN114820967A (en) * | 2022-04-28 | 2022-07-29 | 四川见山科技有限责任公司 | Layered image data real-time drawing method and system |
| CN116340368A (en) * | 2023-05-30 | 2023-06-27 | 壹仟零壹艺网络科技(北京)有限公司 | Cache optimization method for BIM data visualization |
| CN116340368B (en) * | 2023-05-30 | 2023-07-21 | 壹仟零壹艺网络科技(北京)有限公司 | Cache optimization method for BIM data visualization |
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