CN104200506B - Three-dimension GIS massive vector data rendering intent and device - Google Patents

Three-dimension GIS massive vector data rendering intent and device Download PDF

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CN104200506B
CN104200506B CN201410379401.2A CN201410379401A CN104200506B CN 104200506 B CN104200506 B CN 104200506B CN 201410379401 A CN201410379401 A CN 201410379401A CN 104200506 B CN104200506 B CN 104200506B
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vector data
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multithreading
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CN104200506A (en
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林良辉
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Vtron Group Co Ltd
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Vtron Technologies Ltd
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Abstract

The present invention provides a kind of three-dimension GIS massive vector data rendering intent and device, the described method comprises the following steps:Piecemeal, and the region set up after piecemeal and the spatial index of vector data are carried out according to order to three-dimension GIS massive vector data;Vector data is combined according to the attribute of the vector data after piecemeal, multiple vectors is constituted and renders batch;Set up with the multiple vector multithreading model system that to render batch corresponding, and the vector data progress multithreading of each batch is rendered according to the spatial index in the multithreading model system.A kind of three-dimension GIS massive vector data rendering intent and device of the present invention, can real-time rendering go out vector data dynamical state change, and temporally, zone sequence carry out visualization render, the effect that massive vector data after rendering shows compares gradual change, drastically increases the rendering speed and efficiency of massive vector data.

Description

Three-dimension GIS massive vector data rendering intent and device
Technical field
The present invention relates to GIS-Geographic Information System, more particularly to a kind of three-dimension GIS massive vector data rendering intent and A kind of three-dimension GIS massive vector data rendering device.
Background technology
Virtual reality technology fully utilize computer graphics, emulation technology, multimedia technology, artificial intelligence technology, Computer networking technology, parallel processing technique and multi-sensor technology, simulate the sense organ work(such as vision, the sense of hearing, the tactile of people Can, a kind of virtual environment is created, enables a person to be immersed in the virtual word of computer generation, and natural mode can be passed through Real-time, interactive is carried out therewith.
At present, three-dimension GIS (Geographic Information System, GIS-Geographic Information System) visualization technique is ground Study carefully and achieved certain achievement, but improving the roam speed of mass data, improving the sense of reality and aesthetic feeling, landscape number of scene According to still needing further further investigation in terms of the foundation in storehouse.
What comes into a driver's body is a rectangular pyramid for meeting perspective projection principle, for simulating the vision system of human eye.What comes into a driver's body Interior landform is the visibility region of Computerized three-dimensional scene.
Visualized in magnanimity vector in actual application system, there is a lot of other data, such as road, river, lake With the data such as building, it is the target studied from now on that how these mass datas are carried out with effective integrated management and scheduling.
Vector data, which is rendered, refers to that the three dimensions of vector data is shown so that it is special that vector data retains it in three dimensions Levy, such as spatial information and attribute information, and suitable for roaming on a large scale, scaling and the authenticity for keeping data.One three Rendering for scene is tieed up, the raising of rendering efficiency is a difficult point, want to obtain efficient scene rendering, handle mass data, Current difficulty is still than larger.
In traditional vector data rendering intent, by the way that three-dimension GIS vector data is integrally read in into video card and all over readding once, Do not pre-process, to obtain real rendering result.But in this way, when vector data than it is larger when, it is especially extra large When measuring vector data, the time consumed can be long, causes the speed rendered slow.
The content of the invention
Based on this, it is necessary to for the above-mentioned speed for rendering massive vector data it is slow the problem of there is provided a kind of three-dimensional GIS massive vector datas rendering intent and device.
To achieve the above object, the present invention is adopted the following technical scheme that:
A kind of three-dimension GIS massive vector data rendering intent, comprises the following steps:
Piecemeal is carried out according to order progress piecemeal according to order to three-dimension GIS massive vector data, and set up after piecemeal Region and the spatial index of vector data;
Vector data is combined according to the attribute of the vector data after piecemeal, multiple vectors is constituted and renders batch;
Set up with the multiple vector multithreading model system that to render batch corresponding, and in the multithreading model system It is middle that the vector data progress multithreading of each batch is rendered according to the spatial index.
A kind of three-dimension GIS massive vector data rendering device, including:
Piecemeal module, for carrying out piecemeal according to order progress piecemeal according to order to three-dimension GIS massive vector data, and The region set up after piecemeal and the spatial index of vector data;
Secondary module, for being combined according to the attribute of the vector data after piecemeal to vector data, is constituted multiple in batches Vector renders batch;
Multithreading rendering module, for setting up and the multiple vector multithreading model system that to render batch corresponding, And the vector data progress multithreading of each batch is rendered according to the spatial index in the multithreading model system.
A kind of three-dimension GIS massive vector data rendering intent and device of the present invention, passes through it can be seen from above scheme The carry out multithreading of three-dimension GIS massive vector data piecemeal in batches rendered, it is to avoid need to wait all in conventional method Can just be carried out after data render is complete it is another it is a batch of render brought elapsed time length, the problem of rendering speed is slow, can Real-time rendering go out vector data dynamical state change, and temporally, zone sequence carry out visualization render, the magnanimity after rendering The effect that vector data shows compares gradual change, drastically increases the rendering speed and efficiency of massive vector data.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of three-dimension GIS massive vector data rendering intent of the present invention;
Fig. 2 is a kind of structural representation of three-dimension GIS massive vector data rendering device of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.
Shown in Figure 1, a kind of three-dimension GIS massive vector data rendering intent comprises the following steps:
Step S101, piecemeal is carried out to three-dimension GIS massive vector data according to order, and the region set up after piecemeal and The spatial index of vector data, subsequently into step S102.
It should be noted that above-mentioned vector data, can be the isomery vector number of different data format, separate sources According to.In addition, the order in above-mentioned steps can be the order of regional space, for example from left to right, or from the inside to surface etc..
In wherein one embodiment, the piecemeal of vector data can be carried out by the way of quaternary tree, and set up sky Between index.
Step S102, is combined according to the attribute of the vector data after piecemeal to vector data, constitutes multiple vector wash with watercolours Batch is contaminated, subsequently into step S103.For example, can be by same or analogous attribute (such as serious vector number of signal contamination According to) be classified as a vector and render batch.
Step S103, set up with the multiple vector multithreading model system that to render batch corresponding, it is and multi-thread at this Multithreading is carried out in journey model system to the vector data of each batch according to the spatial index to render.
So-called multithreading is rendered, i.e., by multithreading model system, and a batch vector number is rendered using a thread According to mode, while carrying out rendering for multiple batch vector datas.
As a preferable embodiment, multithreading wash with watercolours is being carried out to the vector data of each batch according to the spatial index Before dye, also including step:
It will be stored per batch vector data, including the elementary field such as basic ID sequence number fields, geometric figure collection is believed Cease, wherein the geometry entity shape of geometric figure collection field storage vector element, such as the geometric data such as point, line, surface.Due to this In invention the vector data of batch can dynamic creation come out, preserve batch vector data so as to quick modification, read arrow Data are measured, rendering efficiency can be so improved;
Spatial index table corresponding with any batch vector data is set up in database, and carries out vector data storage.
In addition, as a preferable embodiment, the process that progress multithreading is rendered in step s 103 can specifically be wrapped Include following steps:
Step S1031, according to the multithreading model system Real-Time Scheduling vector data, puts each batch vector data Into render-ahead queue, to handle every batch vector data;
Step S1032, Mobile state drafting is entered to region VectorLayer, to each batch vector number in the render-ahead queue Caching is put into according to generation memory bitmap;
Step S1033, the memory bitmap that batch vector data is taken out in the buffer zone stored in vector data is drawn, Corresponding vector data entity set is obtained by the spatial index table;
Step S1034, obtains the pre-set vector render style configuration information of each batch, and according to time or thing Part developing state, enters Mobile state to the vector data of association according to the vector render style configuration information and renders.
It should be noted that event developing state is the influence factor effect lasting to vector data.
In the solution of the present invention, multithreading can be carried out according to the spatial order of vector data and be rendered, and can be according to Region carries out intersection and rendered.For example, using thread 1,2,3 to be rendered to region 1,2,3 when, after the completion of thread 1,2, line Journey 3 is also being rendered, now, and thread 1,2 continues to render region 4,5, is completed without waiting for region 3;In another example, adopt When being rendered with thread 1,2,3 pairs of a collection of sub-regions 1,2,3, after the completion of thread 1,2, thread 3 is also being rendered, now, line Journey 1,2 continues to render next batch region 1,2, is completed without waiting for previous batch region 3;This phenomenon is that wave is rendered, one The ripple of ripple one, which is rendered, to come.
In wherein one embodiment, after one batch vector data of completion is rendered, the batch vector data is entered immediately It is capable to refresh, and without waiting whole to refresh again after the completion of rendering;And proceed the vector data of next batch in current thread Render, rendered until completing all vector datas in visible scene areas.
In the solution of the present invention, due to vector data piecemeal in batches, is rendered so as to carry out dynamic in order and intersect, is used in combination Multithreading effectively draws vector data by batch, and real-time rendering goes out the change of vector data dynamical state, temporally, zone sequence Visualization is carried out to render, therefore the effect that the massive vector data after rendering is showed compares gradual change, substantially increases Batch dynamic smoothing renders vector data efficiency;Also, due to being retrieved, being divided to complicated magnanimity geography information in the present invention Analysis, so as to be beneficial to arrange data, orderly, to have emphasis progress is shown.In addition, the present invention presses batch with multinuclear thread Drafting vector data is effectively carried out, computer hardware level can be made full use of, the vector data of magnanimity is drawn efficiency maximum Change.
The present invention solves extensive massive vector data and dynamically renders real-time visual by batch, it is ensured that scene walkthrough When scene real-time, the smoothly and continuously property that show, and keep vector equalization to render the continuity of transition.
Several concrete applications of the present invention program are described below:
First, when accident, accident geographical position is switched to, 3 time ranges are sequentially drawn successively Interior accident influence diffusion zone, and distinguished with different colours.Each batch vector area is entered Mobile state according to the time Render, and in chronological order rendering effect is rendered;
2nd, display Frequent Accidents region is counted, realized using bubble diagram, Air Bubble Size and accident quantity pair Should.By being counted to display accident pattern, using segmentation column diagram, section color represents type of fault, and segment length represents quantity.Press Carry out dynamically changing to render coming according to the accident statistics in month;
3rd, visualization is carried out to vector data by region to render.Assuming that nexine is red, influence is represented serious;Middle level is Huang, Represent influence general;Outer layer is green, represents influence slightly, and according to the extension of real-time time prediction coverage, real-time wash with watercolours Contaminate the change rendering effect of influence;
4th, the data of a corresponding session information were write in database every 0.5 second, this is the message registration of most original Information;Then maximum boundary rectangle, split by 100*100 meters of small lattice, can probably generate 4,000,000 faces;Finally All call-informations are concluded into 100*100 meters of lattice, different face are then rendered according to value in each lattice Color, by different expressions in the eyes render can intuitively give user's display area call scenarios.
Embodiment two
In the scheme of above-described embodiment one, by vector data piecemeal and multi-thread data dynamic dispatching, effectively subtracting The data volume that system is disposably handled is lacked.In the present embodiment, using the simplification algorithm based on quad-tree structure to calling in internal memory In vector data carry out Rational Simplification, by the movement tendency when three-dimensional scenic is roamed according to viewpoint calculate prediction area Domain, to improve the efficiency and effect of visualization of scene walkthrough.I.e. in the present embodiment, a kind of three-dimension GIS massive vector data wash with watercolours Dyeing method, can also comprise the following steps:
In three-dimension GIS scene walkthrough, prediction region, and criticizing the prediction region are calculated according to the movement tendency of viewpoint Secondary vector data is loaded into caching.
When three-dimensional scenic is roamed, the movement tendency of viewpoint is random, it is therefore foreseen that the selection in region will include different motion The scope that trend may be shown.If prediction region it is too big or it is too small can all have influence on the continuity and real-time of roaming, pass through The batch vector data for predicting region is loaded into caching in advance, the effect for rendering massive vector data can be further improved Rate.It is further explained below:
Step S201, by different data format, the isomery vector data of separate sources, according to appropriate region, using four forks The mode of tree carries out vector data piecemeal, and sets up spatial index;
The multiple vectors of the composition that combined after step S202, massive vector data piecemeal render batch;
Step S203, initializes three-dimensional scenic, reads in initial visible batch vector data;
Step S204, starts scene walkthrough;
Step S205, starts vector data scheduling thread;
Step S206, judges visible lot data whether all in internal memory, if it did not, into step S209.If Have, directly perform next step;
Step S207, batch vector data, which updates, arrives three-dimensional scenic;
Step S208, if visibility region changes, calculates current visual angle and suitably predicts region, into step S205;
Step S209, calls in visible batch vector data not in the buffer;
Step S210:Calculate the current pre- visible batch vector data in scene visual angle;
Step S211, backstage loads pre- visual data and cached to batch vector data;
Step S212, deletes invisible batch vector data in scene buffering;
Step S213, judges whether to stop roaming, step S205 is returned to if not.
In addition, corresponding with a kind of above-mentioned three-dimension GIS massive vector data rendering intent, the present invention also provides a kind of three-dimensional GIS massive vector data rendering devices, as shown in Fig. 2 including:
Piecemeal module 101, for carrying out piecemeal according to order to three-dimension GIS massive vector data, and sets up after piecemeal Region and the spatial index of vector data;
Secondary module 102, for being combined according to the attribute of the vector data after piecemeal to vector data, are constituted many in batches Individual vector renders batch;
Multithreading rendering module 103, for setting up and the multiple vector multithreading model that to render batch corresponding System, and the vector data progress multithreading of each batch is rendered according to the spatial index in the multithreading model system.
As a preferable embodiment, the three-dimension GIS massive vector data rendering device can also include:
Memory module, for that will be stored per batch vector data;
Concordance list sets up module, for setting up spatial index table corresponding with any batch vector data in database, And carry out vector data storage.
As a preferable embodiment, the multithreading rendering module can include:
Scheduler module, for according to the multithreading model system Real-Time Scheduling vector data, each batch vector number According to being put into render-ahead queue;
Cache module, for being put into caching to each batch vector data generation memory bitmap in the render-ahead queue;
Drafting module, the memory bitmap that batch vector data is taken out in the buffer zone for being stored in vector data is painted System, corresponding vector data entity set is obtained by the spatial index table;
Dynamic rendering module, the vector render style configuration information pre-set for obtaining each batch, and according to Time or event developing state, enter Mobile state to the vector data of association according to the vector render style configuration information and render.
As a preferable embodiment, the three-dimension GIS massive vector data rendering device can also include:
Refresh module, for after one batch vector data of completion is rendered, the batch vector data to be refreshed immediately, And proceed the vector data of next batch in current thread and render, until completing all vectors in visible scene areas Data render.
As a preferable embodiment, the three-dimension GIS massive vector data rendering device can also include:
Data load-on module is predicted, in three-dimension GIS scene walkthrough, prediction area to be calculated according to the movement tendency of viewpoint Domain, and the batch vector data in the prediction region is loaded into caching.
A kind of other technical characteristics of above-mentioned three-dimension GIS massive vector data rendering device and one kind of the present invention are three-dimensional GIS massive vector data rendering intents are identical, and it will not go into details herein.
By above scheme as can be seen that a kind of three-dimension GIS massive vector data rendering intent and device of the present invention, lead to Cross the carry out multithreading of three-dimension GIS massive vector data piecemeal in batches is rendered, it is to avoid need to wait complete in conventional method Can just be carried out after portion's data render is complete it is another it is a batch of render brought elapsed time length, the problem of rendering speed is slow, energy Enough real-time renderings go out the dynamical state change of vector data, and temporally, zone sequence carry out visualization and render, the sea after rendering The effect that amount vector data shows compares gradual change, drastically increases the rendering speed and efficiency of massive vector data.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (8)

1. a kind of three-dimension GIS massive vector data rendering intent, it is characterised in that comprise the following steps:
Piecemeal, and the region set up after piecemeal and the sky of vector data are carried out according to order to three-dimension GIS massive vector data Between index;
Vector data is combined according to the attribute of the vector data after piecemeal, multiple vectors is constituted and renders batch;
Set up and the multiple vector multithreading model system that to render batch corresponding, and the root in the multithreading model system Multithreading is carried out according to the spatial index to the vector data of each batch to render;
The process that the progress multithreading is rendered includes:
According to the multithreading model system Real-Time Scheduling vector data, each batch vector data is put into render-ahead queue;
Caching is put into each batch vector data generation memory bitmap in the render-ahead queue;
The memory bitmap that batch vector data is taken out in the buffer zone stored in vector data is drawn, and passes through the Spatial Cable Draw the corresponding vector data entity set of acquisition;
The pre-set vector render style configuration information of each batch is obtained, and according to time or event developing state, root Enter Mobile state to the vector data of association according to the vector render style configuration information to render.
2. three-dimension GIS massive vector data rendering intent according to claim 1, it is characterised in that according to the sky Between index and the vector data of each batch carried out before multithreading renders, also including step:
It will be stored per batch vector data;
Spatial index table corresponding with any batch vector data is set up in database, and carries out vector data storage.
3. three-dimension GIS massive vector data rendering intent according to claim 2, it is characterised in that also including step:
Complete after a batch vector data renders, immediately to be refreshed the batch vector data, and in current thread after The continuous vector data for carrying out next batch is rendered, and is rendered until completing all vector datas in visible scene areas.
4. the three-dimension GIS massive vector data rendering intent according to claims 1 to 3 any one, it is characterised in that also Including step:
In three-dimension GIS scene walkthrough, prediction region is calculated according to the movement tendency of viewpoint, and the batch in the prediction region is sweared Amount data are loaded into caching.
5. a kind of three-dimension GIS massive vector data rendering device, it is characterised in that including:
Piecemeal module, for carrying out piecemeal according to order to three-dimension GIS massive vector data, and the region set up after piecemeal and The spatial index of vector data;
Secondary module, for being combined according to the attribute of the vector data after piecemeal to vector data, constitutes multiple vectors in batches Render batch;
Multithreading rendering module, for setting up and the multiple vector multithreading model system that to render batch corresponding, and Multithreading is carried out in the multithreading model system to the vector data of each batch according to the spatial index to render;
The multithreading rendering module includes:
Scheduler module, for according to the multithreading model system Real-Time Scheduling vector data, each batch vector data to be put Into render-ahead queue;
Cache module, for being put into caching to each batch vector data generation memory bitmap in the render-ahead queue;
Drafting module, the memory bitmap that batch vector data is taken out in the buffer zone for being stored in vector data is drawn, Corresponding vector data entity set is obtained by the spatial index;
Dynamic rendering module, the vector render style configuration information pre-set for obtaining each batch, and according to the time Or event developing state, Mobile state is entered to the vector data of association according to the vector render style configuration information and rendered.
6. three-dimension GIS massive vector data rendering device according to claim 5, it is characterised in that also include:
Memory module, for that will be stored per batch vector data;
Concordance list sets up module, for setting up spatial index table corresponding with any batch vector data in database, goes forward side by side Row vector data is put in storage.
7. three-dimension GIS massive vector data rendering device according to claim 6, it is characterised in that also include:
Refresh module, for after one batch vector data of completion is rendered, the batch vector data to be refreshed immediately, and The vector data for proceeding next batch in current thread is rendered, until completing all vector datas in visible scene areas Render.
8. the three-dimension GIS massive vector data rendering device according to claim 5 to 7 any one, it is characterised in that also Including:
Data load-on module is predicted, in three-dimension GIS scene walkthrough, prediction region to be calculated according to the movement tendency of viewpoint, And the batch vector data in the prediction region is loaded into caching.
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