CN1702631A - Method for realizing geographical information system dynamic layers - Google Patents
Method for realizing geographical information system dynamic layers Download PDFInfo
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- CN1702631A CN1702631A CN 200510018877 CN200510018877A CN1702631A CN 1702631 A CN1702631 A CN 1702631A CN 200510018877 CN200510018877 CN 200510018877 CN 200510018877 A CN200510018877 A CN 200510018877A CN 1702631 A CN1702631 A CN 1702631A
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Abstract
This invention relates to a dynamic chart realizing process in geography information system, which makes the content of chart spacing data on sheeted and layered process, and sets the chart display proportion range of each chart and conserve them. This invention doesn't deal with those chart that go beyond the current proportion range in each chart, when the system changes the current proportion or switch the sheet, it opens and closes the chart dynamically to ensure both the occupied space of graph data content and the exchanged quantity of space data are less under each state.
Description
Technical field
The present invention relates to the dynamic layer implementation method in the Geographic Information System.
Background technology
Contradiction between time and the space is ubiquitous, the no exception especially in the Geographic Information System field, and Geographic Information System need be handled a large amount of locus relevant informations on the one hand; Require Geographic Information System haveing breakthrough aspect the real-time processing speed on the other hand again.Present generalized information system has various solutions at this contradiction, can be summarized as preferential solution in space and time priority solution.
The best approach that the space mode of priority realizes is directly disk file to be carried out queried access, but in order to improve system effectiveness, still sacrificed some disk spaces and set up index and preserve redundant data, but be to use disk space more suitable with respect to memory headroom.What adopt in MapInfo and ArcView is exactly this way, and graphic operation speed improves and can realize by setting up efficiently index, and is limited but speed improves, and can not satisfy the requirement of real-time, the situation that each graphic operation all can occur waiting for.
Time priority is data to be deposited in the internal memory to carry out as far as possible, it is the fastest that system directly operates data in EMS memory, the problem here is how fast the data above the disk to be read in internal memory, an other space-time contradiction can appear again here, adopt the memory file mapping can improve speed, it is limited that but this speed improves, require very strong generalized information system for real-time, generally all adopt the method for time priority such as real-time monitoring system, but this mode committed memory space is bigger, and needs to handle disk space data and the quick problem that shifts of memory headroom data.
Summary of the invention
The objective of the invention is in order to overcome the problem and shortage of above-mentioned existence, a kind of implementation method of geographical information system dynamic layers is provided, this method is a kind of solution of time and space compromise, can satisfy the requirement that the preferential requirement in space can be satisfied real-time again.
Map data content is carried out framing in the present invention and layering is handled, and the displaying ratio scope and the preservation of figure layer are set simultaneously.The present invention will not handle the figure layer that exceeds current proportional range in generalized information system, simultaneity factor can be preserved the state of each figure layer, when the current ratio of system changes or carries out the map sheet switching, system can open and close the figure layer dynamically, guarantee that the graph data content under each state takes up room less, guarantee that simultaneously the spatial data exchange capacity is less under each state, so just realized real-time demand.Concrete grammar is as follows:
1, the geographical spatial data that generalized information system is used carries out framing and layering processing, framing is to carry out according to special topic and zone, layering is to carry out according to the level of detail and importance, summary and important atural object displaying ratio are little, detailed and less important atural object displaying ratio is big, will scheme the displaying ratio scope of layer simultaneously and preserve.
When 2, system spread out the map, the figure layer that only will satisfy the displaying ratio scope read in memory headroom from disk space, and the figure layer state that has read in memory headroom is set to open, and other figure layer is made as closes.
Need carry out two judgements when 3, system's displaying ratio changes.At first judge the figure layer of all closed conditions,, and scheme layer to be set to open if the current ratio of system is read in memory headroom with the figure layer data from disk space in figure layer displaying ratio scope the inside; Judge the figure layer of all open modes, if the current displaying ratio of system is deleted the figure layer data from internal memory not in the displaying ratio scope of this figure layer.
Map datum is carried out framing according to the geographic position, carry out layering, the figure layer displaying ratio scope and the preservation of every width of cloth map are set, guarantee that summary and important atural object show earlier, show behind the detailed and less important atural object according to type of ground objects.
The present invention has guaranteed that whatsoever system all can take less memory headroom, simultaneously under the situation, under most of situation exchanges data can not take place, even when exchanges data takes place, system also is provided with by layering and guarantees that exchange capacity is less, thereby has guaranteed graphic operation speed.
Description of drawings
Fig. 1 Geographic Information System time-space relationship figure.
Fig. 2 geographical information system dynamic layers realization flow figure.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing.
Fig. 1 has illustrated generalized information system in several solutions at space and time requirement, the invention belongs to a solution of time and space compromise, and system can handle mass data can guarantee real-time again.The present invention handles by framing and layering, and the spatial information of big data quantity is divided into polylith, exchanges low volume data dynamically on disk space and memory headroom then, and generalized information system is each only to be handled the low volume data above the memory headroom.
Fig. 2 has illustrated concrete treatment scheme of the present invention, at first system need carry out map datum framing and layering processing, every width of cloth map initialization show layers sign and figure layer displaying ratio value range are set simultaneously, the setting of value range can be finished according to actual needs by operating personnel, generally speaking, summary and important atural object show that earlier displaying ratio is little, show that displaying ratio is big behind the detailed and less important atural object.
When the GIS computer system starting, with every width of cloth map initialization show layers be masked as really scheme the layer read in memory headroom from disk space, when if the ratio in map window of the every width of cloth map of system does not change, system only needs handle the data in the internal memory.
When certain width of cloth map being carried out graphic operation and causes that graphics proportion changes, such as amplifying and reduction operation, to in this map sheet all be present in disk space and in the memory headroom non-existent figure layer judge, whether the displaying ratio of judging current system is between the minimum displaying ratio and maximum displaying ratio of this figure layer, if, the data content that needs to scheme layer reads in memory headroom from disk space, and figure layer open Status Flag is set to very, if do not exist, need not handle; Simultaneously all figure layers that are present in memory headroom in this map sheet are judged, whether the displaying ratio of judging current system is between the minimum displaying ratio and maximum displaying ratio of this figure layer, if do not exist, the data content of this figure layer is deleted from memory headroom, figure layer open Status Flag is set to vacation, if, do not handle.
When between system is to different map sheets, switching, system can delete the non-initialization figure layer content of map sheet before switching from memory headroom, when handling the big data quantity map, only preserve the initialization figure layer data of all map sheets and some figure layers of this width of cloth map inside current application drawing amplitude ratio example scope in the Installed System Memory all the time.Guaranteed like this that whatsoever system all can take less memory headroom, simultaneously under the situation, under most of situation exchanges data can not take place, even when exchanges data takes place, system also is provided with by layering and guarantees that exchange capacity is less, thereby has guaranteed graphic operation speed.
Claims (2)
1, a kind of geographical information system dynamic layers implementation method, it is characterized in that: carry out according to the following steps: the geographical spatial data that (1) uses generalized information system carries out framing and layering is handled, and every width of cloth map initialization show layers sign and figure layer displaying ratio value range are set simultaneously; When (2) system spread out the map, the figure layer that only will satisfy the displaying ratio scope read in memory headroom from disk space, and the figure layer state that has read in memory headroom is set to open, and other figure layer is made as closes; Need carry out at first judging the figure layer of all closed conditions when (3) system's displaying ratio changes,, and scheme layer to be set to open if the current ratio of system is read in memory headroom with the figure layer data from disk space in figure layer displaying ratio scope with individual two judgements; Judge the figure layer of all open modes again, if the current displaying ratio of system is deleted the figure layer data from internal memory not in the displaying ratio scope of this figure layer.
2, dynamic layer implementation method according to claim 1, it is characterized in that: map datum is carried out framing according to the geographic position, carry out layering according to type of ground objects, the figure layer displaying ratio scope and the preservation of every width of cloth map are set, guarantee that summary and important atural object show earlier, show behind the detailed and less important atural object.
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| CN 200510018877 CN1702631A (en) | 2005-06-08 | 2005-06-08 | Method for realizing geographical information system dynamic layers |
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| CN 200510018877 CN1702631A (en) | 2005-06-08 | 2005-06-08 | Method for realizing geographical information system dynamic layers |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162152B (en) * | 2006-12-06 | 2012-01-11 | 厦门雅迅网络股份有限公司 | Processing method for realizing map displaying in networking vehicle mounted guidance terminal |
| CN101681566B (en) * | 2007-05-30 | 2012-05-02 | 株式会社纳维泰 | Map display system, map display, and map display method |
| CN102541418A (en) * | 2010-12-30 | 2012-07-04 | 上海博泰悦臻电子设备制造有限公司 | Processing method and device for realizing map display |
| CN101415018B (en) * | 2007-10-17 | 2012-08-29 | 北京灵图软件技术有限公司 | Transmission method and system for geographical message data |
| CN102968497A (en) * | 2012-12-04 | 2013-03-13 | 北京世纪高通科技有限公司 | Method and system for dynamically processing data |
| CN103035164A (en) * | 2012-12-24 | 2013-04-10 | 广东威创视讯科技股份有限公司 | Rendering method and system of geographic information system |
| CN104317917A (en) * | 2014-10-29 | 2015-01-28 | 中国南方电网有限责任公司 | High-capacity coverage based mass diagram implementation method |
| CN105320692A (en) * | 2014-07-31 | 2016-02-10 | 中国电信股份有限公司 | Method, device and system for presenting mass data |
-
2005
- 2005-06-08 CN CN 200510018877 patent/CN1702631A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162152B (en) * | 2006-12-06 | 2012-01-11 | 厦门雅迅网络股份有限公司 | Processing method for realizing map displaying in networking vehicle mounted guidance terminal |
| CN101681566B (en) * | 2007-05-30 | 2012-05-02 | 株式会社纳维泰 | Map display system, map display, and map display method |
| CN101415018B (en) * | 2007-10-17 | 2012-08-29 | 北京灵图软件技术有限公司 | Transmission method and system for geographical message data |
| CN102541418A (en) * | 2010-12-30 | 2012-07-04 | 上海博泰悦臻电子设备制造有限公司 | Processing method and device for realizing map display |
| CN102968497A (en) * | 2012-12-04 | 2013-03-13 | 北京世纪高通科技有限公司 | Method and system for dynamically processing data |
| CN102968497B (en) * | 2012-12-04 | 2015-09-23 | 北京世纪高通科技有限公司 | dynamic data processing method and system |
| CN103035164A (en) * | 2012-12-24 | 2013-04-10 | 广东威创视讯科技股份有限公司 | Rendering method and system of geographic information system |
| CN103035164B (en) * | 2012-12-24 | 2015-03-25 | 广东威创视讯科技股份有限公司 | Rendering method and system of geographic information system |
| CN105320692A (en) * | 2014-07-31 | 2016-02-10 | 中国电信股份有限公司 | Method, device and system for presenting mass data |
| CN104317917A (en) * | 2014-10-29 | 2015-01-28 | 中国南方电网有限责任公司 | High-capacity coverage based mass diagram implementation method |
| CN104317917B (en) * | 2014-10-29 | 2017-08-04 | 中国南方电网有限责任公司 | A kind of magnanimity figure implementation method based on Large Copacity figure layer |
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