CN102142155A - Three-dimensional (3D) terrain model data organization method oriented to network interactive visualization - Google Patents
Three-dimensional (3D) terrain model data organization method oriented to network interactive visualization Download PDFInfo
- Publication number
- CN102142155A CN102142155A CN2010101076476A CN201010107647A CN102142155A CN 102142155 A CN102142155 A CN 102142155A CN 2010101076476 A CN2010101076476 A CN 2010101076476A CN 201010107647 A CN201010107647 A CN 201010107647A CN 102142155 A CN102142155 A CN 102142155A
- Authority
- CN
- China
- Prior art keywords
- dimensional
- network
- model
- dimensional model
- models
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Processing Or Creating Images (AREA)
Abstract
The invention provides a three-dimensional (3D) terrain model data organization method oriented to network interactive visualization. The method comprises the following steps: effectively decomposing the externally generated 3D model data, extracting terrain center points from the decomposed 3D model individuals with independent attributes, and taking the points as origins of coordinates for coordinate system conversion; establishing grid indexes the grid spacing of which is consistent with that of terrain grids for all the terrain center points of the 3D models; and when a 3D client side loads the model data in a network environment, loading the 3D models at corresponding LODs (level of detail) from a network, wherein, the center points of the models meet the visual condition. In the method, by adopting the loading mode, the one-time loaded data volume of the network models can be reduced maximally, the 3D terrain models at the corresponding LODs can be called based on the visual condition, and the loading and rendering efficiency of the large-scale 3D models in a network-based 3D visualization system can be greatly improved, thus promoting the deep application of the network-based 3D visualization system in various industries.
Description
Technical field
The invention belongs to computer realm, particularly the extensive ground three-dimensional modeling data method for organizing of the mutual three-dimensional visualization of network-oriented.
Background technology
Extensive ground three-dimensional model is based on important visual content in the three-dimensional geographical environment visualization system of network, drafting by extensive ground three-dimensional model, can utilize computing machine to make up the three-dimensional environment of regional area true to nature, can be applicable to fields such as city planning and assessment, is critical technical problems in the three-dimensional geographical environment visualization system of current network.
At present, in usual way, generally adopt the client terminal local load mode, promptly three-dimensional modeling data is present in this locality, is written into extensive ground three-dimensional modeling data and draws in three-dimension visible sysem by client.Describe the parameter of three-dimensional model and carry out Network Transmission and in GoogleEarth, mainly be based on the KML mode, load at three-dimension visible sysem by client then by the method that network loads three-dimensional model.Can load three-dimensional model from network effectively though load the method for three-dimensional model by network, but it is the same with the shortcoming of client load mode, do not utilize the characteristics of three-dimensional visualization scheduling to carry out the effective tissue and the scheduling of model, low for the loading efficiency of extensive ground three-dimensional model.
Summary of the invention
Problem to be solved by this invention is: the ground three-dimensional modeling data method for organizing that a kind of network-oriented interactive visual is provided, so that when keeping the model complicacy, can utilize the characteristics of terrain data scheduling, carry out effective index and scheduling, the network that improves extensive three-dimensional model loads and visual efficient.
Technical scheme provided by the invention is a kind of ground three-dimensional modeling data method for organizing of network-oriented interactive visual, may further comprise the steps:
Step 1, carry out pre-service for original ground three-dimensional modeling data file, be about to original ground three-dimensional modeling data three-dimensional modeling data that file provides and be decomposed into a plurality of three-dimensional model individualities, described three-dimensional model individuality is corresponding to the actual individuality that has independent attribute in the real world; Extract the ground central point of three-dimensional model individuality, the coordinate conversion of three-dimensional model individuality is the relative coordinate that is the coordinate center origin with its ground central point;
Step 2 is carried out index organization to the ground central point of all three-dimensional model individualities, sets up three-dimensional model graticule mesh index, and the size of mesh spacing is consistent with the mesh spacing of terrain data in the three-dimensional model graticule mesh index;
Step 3 provides the graticule mesh data to do optimization process and scheduling demonstration three-dimensional model individuality by network three-dimensional visualization client to three-dimensional model graticule mesh index.
Method provided by the present invention will effectively be decomposed based on the three-dimensional modeling data that the outside generates, and to individual its ground central point that extracts of the three-dimensional model with independent attribute after decomposing, and to put with this be that true origin is carried out coordinate system and transformed; All three-dimensional model ground central points are set up the graticule mesh index consistent with the landform mesh spacing; Under the network environment during three-dimensional client stress model data, can load the graticule mesh index data of correspondence earlier according to the scheduling of landform, model ground central point in drawing according to visual field cutting condition plaid matching rete cord then carries out observability to be judged, and loads the three-dimensional model that corresponding other central point of LOD level meets visual condition according to the drafting condition from network.Therefore, the present invention can be under the situation of data that do not change model and organizational form, and foundation meets network data scheduling and visual model index, effectively the LOD multi-stage scheduling and the drafting of implementation model.In the network loading and visualization process of whole three-dimensional model, owing in the early stage the graticule mesh index data based on three-dimensional model has been carried out effective visual cutting, reduced in a large number simultaneously from the disposable data volume that loaded multi-model of network, accurately be carried in the model in the visual condition and range, thereby improved the loading efficiency of model, improved the speed of playing up of scene, simultaneously, based on index stress model individuality, help when loading, calling the model individuality of different stage according to correlated condition selectivity such as viewpoints, the LOD hierarchical loading and the demonstration of model have been realized, it is optimum that effect of visualization can reach, it has great importance to improving the visual efficient of based on network extensive ground three-dimensional model, and will make network three-dimensional spatial information visualization system have significant values in the extensive popularization in other industry, this also is an important meaning of the present invention.
Description of drawings
Fig. 1 divides synoptic diagram for the quaternary tree form.
Embodiment:
Describe technical solution of the present invention in detail below in conjunction with embodiment.
Step 1, original ground three-dimensional modeling data file pre-service.Embodiment comprises following concrete steps:
Step 1.1 is created two arrays, is used for Template Information and model information in the storage file respectively.
Step 1.2 is created a figure container, is used for storing material information, and the material title is made as the key word of figure container.
Step 1.3 is read in original .x file, and this document is the big file that comprises a plurality of single models, as all models in the scene.The present invention is called the three-dimensional model individuality with single model, and each three-dimensional model individuality is corresponding to the actual individuality with independent attribute, for example house, a road in the real world.
Step 1.4 deposits Template Information and each single model information of big file in two arrays, material information is deposited in the figure container, and be called the key word of figure container with the material name.
During the single model .x file of step 1.5 output, directly export the Template Information and the single model information of big file.By searching the key word in the figure container, material information is inserted in the .x file of single model afterwards.
Step 1.6 is extracted the ground central point (being called for short the model center point) of three-dimensional model individuality, and the coordinate conversion of three-dimensional model is the relative coordinate that is the coordinate center origin with this point;
Step 2: the piecemeal of model data.Embodiment comprises following concrete steps:
Step 2.1.1: the latitude and longitude coordinates that from the subsidiary model attributes file of master pattern data, reads each model.This process needs model file is carried out pre-service, when model file is not to be a file with single model, but file is when having comprised a plurality of model in the scene, then need the three-dimensional model file pre-service of step 1, it is decomposed into corresponding to a plurality of three-dimensional model files that have the independent attribute individuality in the real world.
Step 2.1.2: with global range is a square, and this square is successively carried out the quadrisection branch.As accompanying drawing 1.The square central point is a true origin, i.e. 0 ° of longitude and 0 ° of latitude, and bottom is respectively 90 ° of north latitude and 90 ° in south latitude on the square, and limit, the square left and right sides is respectively 180 ° in west longitude and 180 ° of east longitudes.Square is successively carried out the quadrisection branch, each piece that is syncopated as is encoded, the coded system that sets up on their own is: the number of plies-line number-columns.For example, after the cutting of ground floor square secondary, four block encodings are respectively 2-1-1,2-1-2,2-2-1,2-2-2 in the second layer; After three cuttings, the block encoding in the upper left corner is 3-1-1 in the 3rd layer.This cutting method is identical with the terrain data cutting method, and promptly the terrain data of same point has identical block encoding with model data.
Step 2.1.3: because model data is to be configured in earth surface, so model data is appointed as the 14th layer of above-mentioned piecemeal, according to the global slit mode of step 2.1.2, this one deck is divided into 214 * 214 with the face of land.With the model latitude and longitude coordinates is parameter, and calculating this longitude and latitude point is the line number and the columns of single model center point place piecemeal.
The line number computing formula is:
The columns computing formula is:
Wherein:
N: line number;
M: columns;
X: model longitude coordinate;
Y: model latitude coordinate;
P: pixel resolution;
Above-mentioned pixel resolution P is meant that in institute's piecemeal, the width on the true ground that each pixel is expressed, unit are " rice ".In processing, P is made as 18m with the first floor, then P=18/2 in the formula
14(m).
2.2 generate the three-dimensional model description document: may further comprise the steps,
Step 2.2.1: create file and be used for storing the three-dimensional model descriptor.
Step 2.2.2: obtain model center point latitude and longitude coordinates information respectively by step 1.6.
Step 2.2.3: with each three-dimensional model individuality is a unit, and the latitude coordinate with title, this model longitude coordinate and this model of this model deposits file in respectively.
2.3 generate piecemeal information index file: may further comprise the steps,
Step 2.3.1: obtain the branch block message of each three-dimensional model individuality by step 2.1.3, i.e. the piecemeal that belongs to of each model center point longitude and latitude coordinate.
Step 2.3.2: with each piece is a unit, the first ranks of this piece of record number, and record belongs to the model file title of this piece again.
Step 3:
When network three-dimensional visualization client (existing display technique) is called three-dimensional modeling data and is shown, call three-dimensional model graticule mesh index earlier, after three-dimensional model graticule mesh index provided the graticule mesh data to carry out visual cutting to realize optimization process, it is individual and draw accordingly to load the three-dimensional model meet display condition (for example modal position is in the client visible scope, and the level of detail of model satisfies the client display requirement) from network again.
Claims (1)
1. the ground three-dimensional modeling data method for organizing of a network-oriented interactive visual, may further comprise the steps: step 1, carry out pre-service for original ground three-dimensional modeling data file, be about to original ground three-dimensional modeling data three-dimensional modeling data that file provides and be decomposed into a plurality of three-dimensional model individualities, described three-dimensional model individuality is corresponding to the actual individuality that has independent attribute in the real world; Extract the ground central point of three-dimensional model individuality, the coordinate conversion of three-dimensional model individuality is the relative coordinate that is the coordinate center origin with its ground central point; Step 2 is carried out index organization to the ground central point of all three-dimensional model individualities, sets up three-dimensional model graticule mesh index, and the size of mesh spacing is consistent with the mesh spacing of terrain data in the three-dimensional model graticule mesh index; Step 3 provides the graticule mesh data to do optimization process and scheduling demonstration three-dimensional model individuality by network three-dimensional visualization client to three-dimensional model graticule mesh index.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101076476A CN102142155A (en) | 2010-02-02 | 2010-02-02 | Three-dimensional (3D) terrain model data organization method oriented to network interactive visualization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101076476A CN102142155A (en) | 2010-02-02 | 2010-02-02 | Three-dimensional (3D) terrain model data organization method oriented to network interactive visualization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102142155A true CN102142155A (en) | 2011-08-03 |
Family
ID=44409636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101076476A Pending CN102142155A (en) | 2010-02-02 | 2010-02-02 | Three-dimensional (3D) terrain model data organization method oriented to network interactive visualization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102142155A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412959A (en) * | 2013-08-30 | 2013-11-27 | 天津市测绘院 | Method for quickly displaying monomer model in massive geographical information three-dimensional models |
| CN105741349A (en) * | 2016-01-29 | 2016-07-06 | 北京京能高安屯燃气热电有限责任公司 | Loading method and device of complex three-dimensional model in three-dimensional virtual simulation |
| CN110677325A (en) * | 2019-10-14 | 2020-01-10 | 中国人民解放军32039部队 | Network connection state display method and device and electronic equipment |
| CN111651369A (en) * | 2020-08-05 | 2020-09-11 | 浙江欣奕华智能科技有限公司 | Method, device and equipment for carrying out simulation test on intelligent equipment |
-
2010
- 2010-02-02 CN CN2010101076476A patent/CN102142155A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412959A (en) * | 2013-08-30 | 2013-11-27 | 天津市测绘院 | Method for quickly displaying monomer model in massive geographical information three-dimensional models |
| CN105741349A (en) * | 2016-01-29 | 2016-07-06 | 北京京能高安屯燃气热电有限责任公司 | Loading method and device of complex three-dimensional model in three-dimensional virtual simulation |
| CN110677325A (en) * | 2019-10-14 | 2020-01-10 | 中国人民解放军32039部队 | Network connection state display method and device and electronic equipment |
| CN111651369A (en) * | 2020-08-05 | 2020-09-11 | 浙江欣奕华智能科技有限公司 | Method, device and equipment for carrying out simulation test on intelligent equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106547853B (en) | Forestry big data construction method based on one graph | |
| CN101963996B (en) | Global raster data storing method | |
| CN110222445A (en) | Based on BIM and the integrated of design information, collaborative design and delivery method and system | |
| CN103049549B (en) | A kind of island data management method and system | |
| CN106407408A (en) | A spatial index construction method and device for mass point cloud data | |
| CN111008422A (en) | Building live-action map making method and system | |
| Zhao | Application of 3D CAD in landscape architecture design and optimization of hierarchical details | |
| CN104408564A (en) | Digital water resource system | |
| CN112184908A (en) | 3D Tiles format model bounding box data generation method for realizing oblique photography model based on Cesum | |
| CN103065361A (en) | Three-dimensional (3d) island sandbox achieving method | |
| CN103440682A (en) | Method and system for rapid three-dimensional mapping | |
| CN104504742A (en) | Three-dimensional military mark plotting method based on electronic sand table system | |
| CN105354882A (en) | Method for constructing big data architecture based three-dimensional panoramic display platform for large-spatial-range electricity transmission | |
| CN110287508A (en) | A kind of visualization emerging system of multi-source D Urban model | |
| Hu et al. | Design smart city based on 3S, internet of things, grid computing and cloud computing technology | |
| CN102142155A (en) | Three-dimensional (3D) terrain model data organization method oriented to network interactive visualization | |
| Zhou et al. | Three‐Dimensional Reconstruction of Huizhou Landscape Combined with Multimedia Technology and Geographic Information System | |
| CN107391745A (en) | Extensive spatial data classification fast indexing method and device | |
| Borisov et al. | An automated process of creating 3D city model for monitoring urban infrastructures | |
| WO2018196214A1 (en) | Statistics system and statistics method for geographical influence on vernacular architectural form | |
| CN101763659B (en) | Method for automatically generating large-scale digitization altitude data model based on image set | |
| Le Hoang Son et al. | Developing JSG framework and applications in COMGIS project | |
| Kumar et al. | A CityGML extension for handling very large TINs | |
| Qiao et al. | A rapid visualization method of vector data over 3D terrain | |
| CN114490907A (en) | Method and device for constructing famous city management database and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110803 |