CN103035164B - Rendering method and system of geographic information system - Google Patents
Rendering method and system of geographic information system Download PDFInfo
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- CN103035164B CN103035164B CN201210568359.XA CN201210568359A CN103035164B CN 103035164 B CN103035164 B CN 103035164B CN 201210568359 A CN201210568359 A CN 201210568359A CN 103035164 B CN103035164 B CN 103035164B
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Abstract
The invention discloses a rendering method of a geographic information system. The rendering method comprises dividing a map layer needing to be displayed into a plurality of sublayers which comprise bottom layers and more than one hot spot layers, respectively creating display lists based on an Open graphics library (GL) for the bottom layers and each hot spot layer, and drawing the bottom layers and the hot spot layers by invoking the display lists corresponding to the bottom layers and the hot spot layers when a map needs to be rendered. The invention further provides a corresponding system. When the map is displayed or renewed, only changed sublayers need to be processed, not all sublayers need to be processed, and therefore the consumed time in mapping is reduced, mapping efficiency is improved, and display effect is further improved.
Description
Technical field
The present invention relates to Cartographic Technique field, be specifically related to a kind of GIS-Geographic Information System rendering intent and system.
Background technology
The rendering system of GIS-Geographic Information System (Geographic Information System, GIS) for showing base map on combination, vector, icon, the various map elements such as word.GIS rendering system in current industry carrys out management data according to map layer, contains the map elements that various needs are played up in map layer.
Each Data Update of map layer all may trigger redrawing of rendering system, again processes all data of map layer.When the combination that resolution ratio is larger carries out GIS display, if need the map layer drawn more, when each map layer comprises again a large amount of map elements, drawing process is consuming time very long, and efficiency is very low, has a strong impact on display effect.
Summary of the invention
The embodiment of the present invention provides a kind of GIS-Geographic Information System rendering intent and system, to solve prior art length consuming time when carrying out GIS and playing up, inefficient technical problem.
The technical scheme that the embodiment of the present invention adopts is as follows:
A kind of Distribution GIS rendering intent, is characterized in that, comprising:
The map partitioning that will need display be several sublayers, and described sublayer comprises a base map layer and more than one focus layer, is respectively base map layer and the establishment of each focus layer based on the display list of OpenGL;
When needing to play up map, by calling the display list of base map layer and focus layer correspondence, draw base map layer and focus layer.
A kind of Distribution GIS rendering system, comprising:
Data management module, for the map layer of display will be needed to be divided into several sublayers, described sublayer will comprise a base map layer and more than one focus layer, be respectively base map layer and each focus layer and create display list based on OpenGL;
Rendering module, for the display list by calling base map layer and focus layer correspondence, draws base map layer and focus layer.
It is several sublayers by map partitioning in advance that the embodiment of the present invention adopts, and the base map layer be respectively wherein and each focus layer create the display list based on OpenGL, subsequently through calling display list, draw the technical scheme of base map layer and focus layer, when making carry out map denotation or upgrade, only need to process the vicissitudinous sublayer of data, and all sublayers need not be processed, thus it is consuming time to reduce drawing, improve drawing efficiency, and then improve display effect.
Accompanying drawing explanation
Fig. 1 is the flow chart of the GIS rendering intent that the embodiment of the present invention provides;
Fig. 2 is the schematic diagram of the GIS rendering system that the embodiment of the present invention provides.
Detailed description of the invention
The embodiment of the present invention provides a kind of GIS-Geographic Information System rendering intent, can reduce the mapping time, solves prior art length consuming time when carrying out GIS and playing up, inefficient technical problem.The embodiment of the present invention also provides corresponding system.Below be described in detail respectively.
Embodiment one,
Please refer to Fig. 1, the embodiment of the present invention also provides a kind of GIS rendering intent, comprising:
110, the map layer of display will be needed to be divided into several sublayers, described sublayer comprises a base map layer and more than one focus layer, is respectively base map layer and each focus layer and creates display list based on OpenGL.
In the present embodiment, will the map layer of display be needed to be divided into several sublayers, said sublayer at least comprises base map layer and this two type of focus layer, optionally, can also comprise the third type dynamic layer.Base map layer comprises the base map slice of data of the map layer of needs display; Focus layer comprises metastable map elements, specifically comprises the key elements such as point, line, surface, icon and label character; Dynamic layer comprises the map elements needing frequent updating, specifically can comprise point, line, surface, icon and word.Once display task at most and only have a base map layer, several focus layers, and zero or a dynamic layer.
Each sublayer contains some map elementses needing display, and system is each base map layer and focus layer application establishment display list based on OpenGL, and in this display list, draw all map elementses of this sublayer.Because the frequency of dynamic layer more new data is very high, redraws at every turn and all need to repaint map elements, so be not that dynamic layer creates display list.It should be noted that, said OpenGL(Open GraphicsLibrary) be the graphic package interface of specialty, be one powerful, call underlying graphics storehouse easily; Said display list is the object of OpenGL, can identify after this Object Creation with the ID of shaping number.
When 120, needing to play up map, by calling the display list of base map layer and focus layer correspondence, draw base map layer and focus layer.
In embody rule, when needing to play up map, draw each sublayer according to following flow process:
First call the display list of base map layer correspondence, draw base map layer; Then call the display list of each focus layer correspondence, draw each focus layer; Last each map elements directly drawing dynamic layer.
When needs upgrade map, more new technological process is as follows:
First determine to need the sublayer of renewal and the type judging this sublayer; If need the sublayer upgraded to be base map layer or focus layer, then delete the display list that this sublayer is corresponding, re-create the display list of this sublayer according to the map elements after renewal; If need the sublayer upgraded to be dynamic layer, then repaint dynamic layer according to the map elements after renewal.
Wherein, when re-creating the display list of certain sublayer, first for this sublayer creates new display list, in the display list that this is new, draw all map elementses of this sublayer, comprise the map elements after renewal.New display list after renewal identifies with new ID, does not have the ID of the display list upgraded to remain unchanged.
Visible, renewal rewards theory only processes drafting again to the map elements of some sublayer of system, and does not have vicissitudinous sublayer, then without the need to reprocessing, which improves the efficiency that GIS plays up.
To sum up, embodiments provide a kind of GIS-Geographic Information System rendering intent, organising data in units of sublayer, for each sublayer creates display list, this display list is in fact the set of a render instruction, when system refreshes, for the set not having the sublayer of data variation directly to call this render instruction, to the set that the sublayer of data variation should be had then to upgrade this render instruction.Thus technical solution of the present invention, when carrying out map denotation or upgrading, only needs to process the vicissitudinous sublayer of data, and need not process all sublayers, thus it is consuming time to reduce drawing, improves drawing efficiency, thus improve display effect.
Embodiment two,
Please refer to Fig. 2, the embodiment of the present invention also provides a kind of GIS rendering system, comprising:
Data management module 210, for the map layer of display will be needed to be divided into several sublayers, described sublayer will comprise a base map layer and more than one focus layer, be respectively base map layer and each focus layer and create display list based on OpenGL;
Rendering module 220, for the display list by calling base map layer and focus layer correspondence, draws base map layer and focus layer.
Optionally, described sublayer can also comprise dynamic layer; Described rendering module 220 can also be used for each map elements directly drawing dynamic layer.
Optionally, in other embodiment, described system can also comprise: more new module;
Described more new module, for determining to need the sublayer of renewal and the type judging this sublayer;
Described data management module, if also for needing the sublayer upgraded to be base map layer or focus layer, delete the display list that this sublayer is corresponding, re-creates the display list of this sublayer according to the map elements after renewal;
Described rendering module, if also for need upgrade be dynamic layer, according to upgrade after map elements repaint dynamic layer.
To sum up embodiments provide a kind of GIS rendering system, map partitioning is several sublayers by this system in advance, and the base map layer be respectively wherein and each focus layer create the display list based on OpenGL, subsequently through calling display list, draw base map layer and focus layer, when making carry out map denotation or upgrade, only need to process the vicissitudinous sublayer of data, and all sublayers need not be processed, thus it is consuming time to reduce drawing, improve drawing efficiency, thus improve display effect.
Below for an embody rule scene, GIS rendering system of the present invention is described further.
In this application scene, GIS rendering system specifically can comprise: functional interface module, data management module, rendering module.Wherein: functional interface module is power function disclosed in system external, calls for external application.The data of functional interface function to sublayer each in system that data management module calls according to external application manage, and upgrade corresponding Data Elements in sublayer.The function of rendering module is all sublayers in Ergodic Theory, and order draws each sublayer.
In an embody rule, system modules performs an action can be as described below:
First, external application calls " adding map base map layer " function of GIS rendering system;
The instruction that data management module sends according to external application, creates OpenGL display list MapLayer_render_id, and draw base map layer data in this display list.
Secondly, external application calls " adding focus layer " function and other function are to create focus layer;
The instruction that data management module sends according to external application, creates Opengl display list HotSrcLayer_render_id, and draw point, line, surface, icon and lteral data in this display list;
Finally, external application calls " interpolation dynamic layer " function, and other function is to create dynamic layer, and this sublayer shows point, line, surface, icon and word key element.
So far, GIS rendering system is base map layer, and focus layer and dynamic layer have all shown.
In addition, when the data of dynamic layer or other sublayer need to upgrade, system needs again to show data.Such as, suppose that dynamic layer represents that data comprise the information of 100 GPS points, the position of these GPS points is frequent variations.At this moment, concrete sub-step is as follows:
The data of data management module to dynamic layer upgrade;
Call the display list of base map layer correspondence, because base map layer data does not change, so this sublayer is without the need to upgrading, directly call corresponding display list, thus improve display speed;
Travel through each focus layer, call corresponding display list successively, because each focus layer data does not change, so focus layer is without the need to upgrading, directly call corresponding display list, thus improve display speed;
Each map elements of direct drafting dynamic layer, completes map denotation.
Above, be for embody rule scene, being described in further detail technical solution of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment can have been come by hardware, also can have been come by the hardware that programmed instruction is relevant, this program can be stored in a computer-readable recording medium, and storage medium can comprise: read-only storage, random-access memory, disk or CD etc.
The GIS-Geographic Information System rendering intent provided the embodiment of the present invention above and system are described in detail, but the explanation of above embodiment just understands method of the present invention and core concept thereof for helping, and should not be construed as limitation of the present invention.Those skilled in the art are in the technical scope that the present invention discloses, and the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (6)
1. a Distribution GIS rendering intent, is characterized in that, comprising:
To the map layer of display be needed to be divided into several sublayers, described sublayer comprises a base map layer and more than one focus layer, and wherein, base map layer comprises the base map slice of data of the map layer of needs display, and focus layer comprises metastable map elements;
Be respectively base map layer and each focus layer and create display list based on OpenGL;
When needing to play up map, by calling the display list of base map layer and focus layer correspondence, draw base map layer and focus layer.
2. method according to claim 1, is characterized in that:
Described sublayer also comprises dynamic layer, and dynamic layer comprises the map elements needing frequent updating;
The described display list by calling base map layer and focus layer correspondence, also comprises after drawing base map layer and focus layer: each map elements drawing dynamic layer.
3. method according to claim 2, is characterized in that, also comprises:
When needing to upgrade map, determine to need the sublayer of renewal and the type judging this sublayer;
If need the sublayer upgraded to be base map layer or focus layer, delete the display list that this sublayer is corresponding, re-create the display list of this sublayer according to the map elements after renewal;
If need the sublayer upgraded to be dynamic layer, repaint dynamic layer according to the map elements after upgrading.
4. a Distribution GIS rendering system, is characterized in that, comprising:
Data management module, for will the map layer of display be needed to be divided into several sublayers, described sublayer comprises a base map layer and more than one focus layer, wherein, base map layer comprises the base map slice of data of the map layer of needs display, focus layer comprises metastable map elements, is respectively base map layer and each focus layer and creates display list based on OpenGL;
Rendering module, for the display list by calling base map layer and focus layer correspondence, draws base map layer and focus layer.
5. GIS rendering system according to claim 4, is characterized in that:
Described sublayer also comprises dynamic layer, and dynamic layer comprises the map elements needing frequent updating;
Described rendering module is also for drawing each map elements of dynamic layer.
6. GIS rendering system according to claim 5, is characterized in that, also comprise: more new module;
Described more new module, for determining to need the sublayer of renewal and the type judging this sublayer;
Described data management module, if also for needing the sublayer upgraded to be base map layer or focus layer, delete the display list that this sublayer is corresponding, re-creates the display list of this sublayer according to the map elements after renewal;
Described rendering module, if also for need upgrade be dynamic layer, according to upgrade after map elements repaint dynamic layer.
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