CN102968472A - Method and system of data caching for GIS (geographic information system) - Google Patents
Method and system of data caching for GIS (geographic information system) Download PDFInfo
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- CN102968472A CN102968472A CN2012104570819A CN201210457081A CN102968472A CN 102968472 A CN102968472 A CN 102968472A CN 2012104570819 A CN2012104570819 A CN 2012104570819A CN 201210457081 A CN201210457081 A CN 201210457081A CN 102968472 A CN102968472 A CN 102968472A
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Abstract
The invention provides a method and a system of data caching for a GIS (geographic information system). The method comprises the steps of: receiving layer selection information, wherein the layer selection information comprises name information of a thematic layer; determining each concern element according to data of the thematic layer corresponding to the name information; determining the concern area of each concern element respectively according to the geographical coordinate scope of each concern element; and caching data in a buffer area formed by each concern area. The efficiency of displaying electronic maps of the GIS can be improved greatly.
Description
Technical field
The present invention relates to Internet technical field, particularly relate to a kind of data cache method for GIS and system.
Background technology
GIS (Geographic Information System, Geographic Information System) be that a kind of fusion calculation machine graphics and database technology are in one, store and process the new and high technology of spatial information, it organically combines geospatial location and association attributes, accurately true according to actual needs, both pictures and texts are excellent exports to the user, satisfy various users to the requirement of spatial information, simultaneously by its exclusive spatial analysis and Visualization mode, various decision-making functions are provided, the GIS technology is applied to various applications, and setting up a series of application systems is inexorable trends of social informatization development.
Buffer memory is the common practice that the GIS field is used for improving display speed, yet, the cache way of traditional GIS mostly is greatly the zone of the current indication range periphery of buffer memory and the corresponding region of adjacent layer thereof, so, if the user just carries out the translation of less span to map, because the data that need to show are in being buffered in internal memory, so this operation will expend the less time, if but the user needs the large span mobile electronic map when checking the data that some they are concerned about, owing to there are not the data of buffer memory respective regions, and can only these data be processed in real time, therefore needing the more time, this has just restricted the display speed of electronic chart greatly.
Summary of the invention
The object of the present invention is to provide a kind of data cache method for GIS and system, can greatly improve the display efficiency of electronic chart.
Purpose of the present invention is achieved through the following technical solutions:
A kind of data cache method for GIS comprises the steps:
Reception figure layer is chosen information, and described figure layer is chosen the name information that information comprises special layer;
Determine respectively to pay close attention to key element according to the special layer data corresponding with described name information;
Determine respectively the region-of-interest of each described concern key element according to the geographic coordinate scope of each described concern key element;
Buffer memory comprises the data in the buffer area that each described region-of-interest consists of.
A kind of data buffering system for GIS comprises:
Receiver module is used for reception figure layer and chooses information, and described figure layer is chosen the name information that information comprises special layer;
The key element determination module is used for determining respectively to pay close attention to key element according to the special layer data corresponding with described name information;
The zone determination module is for the region-of-interest of determining respectively each described concern key element according to the geographic coordinate scope of each described concern key element;
Cache module is for the data that comprise in the buffer area that each described region-of-interest consists of.
Scheme according to the invention described above, at user selection behind special layer, the present invention program receives the name information of this special layer, can determine respectively to pay close attention to key element according to the special layer data corresponding with this name information, then determine respectively the region-of-interest of each described concern key element according to the geographic coordinate scope of each described concern key element, buffer memory comprises the data in the buffer area that each described region-of-interest consists of again, selected a special layer owing to the user is every, afterwards some operations generally all are relevant with the data of this special layer, and the present invention program is to having carried out buffer memory to the key element of respectively paying close attention to that should special layer, even large span is moved electronic chart, also can the data of paying close attention in region-of-interest corresponding to key element be shown fast, greatly improved display efficiency.
Description of drawings
Fig. 1 is the schematic flow sheet of the data cache method embodiment for GIS of the present invention;
Fig. 2 is line object region-of-interest synoptic diagram;
Fig. 3 is the buffer area synoptic diagram of the line object in the corresponding diagram 2;
Fig. 4 resembles the region-of-interest synoptic diagram for facing;
Fig. 5 is the buffer area synoptic diagram in the face of elephant in the corresponding diagram 4;
Fig. 6 is another synoptic diagram of region-of-interest of the line object in the corresponding diagram 2;
Fig. 7 is the structural representation of the data buffering system embodiment for GIS of the present invention;
Fig. 8 is the structural representation of buffer module among Fig. 7;
Fig. 9 is the structural representation of regional determination module among Fig. 7.
Embodiment
The present invention is further elaborated below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited to this.
Referring to shown in Figure 1, it is the schematic flow sheet of the data cache method embodiment for GIS of the present invention.As shown in Figure 1, the data cache method for GIS among this embodiment comprises step:
Step S101: reception figure layer is chosen information, described figure layer is chosen the name information that information comprises special layer, enter step S102, the present invention program comprises several special layers, such as comprising the special layers such as railway distribution plan layer, highway distribution plan layer, water route distribution plan layer, colliery point distribution plan layer, the user selects first interested special layer before operation, this special layer will be by the present invention program as the buffer memory foundation, because the user pays close attention to the information of this special layer most so;
Step S102: determine respectively to pay close attention to key element according to the special layer data corresponding with described name information, enter step S103, wherein, special layer data can be recorded in the file, the shape information of some figures of the special layer that record is corresponding etc., can determine respectively to pay close attention to key element by traveling through corresponding file, general, the special layer data can use vector file to preserve, this is because vector file preserves is geometric data and the attribute data of geographical entity, the information such as the geographic coordinate of this geographical entity of the Changjiang river and length have been preserved in the special layer such as the only one China river, therefore more convenient to the analysis of polar plot, vector file is traveled through the data that just can get access to each corresponding entity;
Step S103: the region-of-interest of determining respectively each described concern key element according to the geographic coordinate scope of each described concern key element;
Step S104: buffer memory comprises the data in the buffer area that each described region-of-interest consists of, wherein, data cachedly can adopt mode of the prior art, do not repeat them here, in addition, according to actual needs, the data of buffer memory can be the base map data corresponding with the buffer area, also can be data with special layer corresponding to buffer area, also can be the base map data corresponding with the buffer area and the data of each special layer, perhaps other.
Accordingly, according to the scheme in the present embodiment, at user selection behind special layer, the present invention program receives the name information of this special layer, can determine respectively to pay close attention to key element according to the special layer data corresponding with this name information, then determine respectively the region-of-interest of each described concern key element according to the geographic coordinate scope of each described concern key element, buffer memory comprises the data in the buffer area that each described region-of-interest consists of again, selected a special layer owing to the user is every, afterwards some operations generally all are relevant with the data of this special layer, and the present invention program is to having carried out buffer memory to the key element of respectively paying close attention to that should special layer, even large span is moved electronic chart, also can the data of paying close attention in region-of-interest corresponding to key element be shown fast, greatly improved display efficiency.Simultaneously, because of the data of buffer memory for paying close attention to key element, the storage space that takies is also relatively less.
Wherein, the data procedures of buffer memory buffer area, different implementations can be arranged, wherein a kind of implementation is: search respectively the map section that comprises each described region-of-interest, the again cache lookup map section of arriving is because region-of-interest is generally a plurality of, should search respectively corresponding map section, according to actual requirement, the map tangent plane can comprise the base map section, also can comprise section corresponding to each figure layer.
On the other hand, in order to realize better buffering effect, in data corresponding to buffer memory region-of-interest, also can cushion the data of the near zone of region-of-interest, the near zone that is about to each region-of-interest is also as the part of buffer area, wherein, the near zone of each region-of-interest is to determine according to preset rules respectively, when carrying out buffer memory, search respectively first the map section that comprises each region-of-interest and corresponding peripheral region, the again cache lookup map section of arriving; Thereby, carrying out electronic chart when showing, the picture of region-of-interest and corresponding near zone is drawn after can both directly reading in the buffer zone; But, determine that the rule of the near zone of region-of-interest determines according to actual requirement, consider buffering effect and storage size such as needs, this is because the scope of near zone is larger, needs the data of buffering just more, when showing, need the real-time data that read from hard disk just fewer, speed is just than comparatively fast like this, but the scope of near zone is larger, and the storage space that need to take is also just larger.
In addition, foregoing concern key element generally comprise an object, line object, in the face of resembling.The region-of-interest of some object can be the correspondence position of the coordinate figure of this object; The region-of-interest of line object can be the longitude scope of this line object and the square region that latitude scope consists of, as shown in Figure 2, suppose that the curve among the figure is the concern key element, then the region-of-interest of this line object then is the zone shown in the dotted line frame among the figure, accordingly, the map section that needs buffer memory can be the map section in the bold box zone shown in Figure 3, but the size that also can suitably increase this bold box zone is with the raising display effect; The region-of-interest of wanting in the face of picture can be the zone that this each summit of facing picture consists of, as shown in Figure 4, suppose that triangle, rhombus and hexagon among the figure are the concern key element, then triangle, rhombus and hexagonal region-of-interest are respectively the zone that each polygon surrounds, be the dash area among Fig. 4, accordingly, needing the map section of buffer memory can be that map in the bold box zone shown in Figure 5 is cut into slices.
In addition, as shown in Figure 2, the scope of the region-of-interest of the line object of being determined by mode as previously mentioned is larger, there are data corresponding to subregion need not buffer memory, caused the wasting of resources, for this reason, can also first line object be divided into some segments, and then the set of the square region that is made of longitude scope and the latitude scope of these segments is as the region-of-interest of this line object, as shown in Figure 6, adopt this mode, greatly conserve storage, wherein, the mode of segmentation can have different implementations, as keeps every segment to have identical longitude span, perhaps keeps every segment to have identical latitude span, perhaps keep every segment to have identical length etc., do not repeat them here.
Embodiment 2
According to the data cache method for GIS of the invention described above, the present invention also provides a kind of data buffering system for GIS, below is elaborated with regard to the concrete example of the data buffering system for GIS of the present invention.The structural representation of data buffering system embodiment for GIS of the present invention has been shown among Fig. 7, the data buffering system for GIS among this embodiment comprises receiver module 201, key element determination module 202, regional determination module 203, cache module 204, wherein:
Key element determination module 202, be used for determining respectively to pay close attention to key element according to the special layer data corresponding with described name information, wherein, special layer data can be recorded in the file, the shape information of some figures of the special layer that record is corresponding etc., can determine respectively to pay close attention to key element by traveling through corresponding file, general, the special layer data can use vector file to preserve, this is because vector file preserves is geometric data and the attribute data of geographical entity, the information such as the geographic coordinate of this geographical entity of the Changjiang river and length have been preserved in the special layer such as the only one China river, therefore more convenient to the analysis of polar plot, vector file is traveled through the data that just can get access to each corresponding entity;
Accordingly, according to the scheme in the present embodiment, at user selection behind special layer, receiver module 201 receives the name information of this special layer, key element determination module 202 can determine respectively to pay close attention to key element according to the special layer data corresponding with this name information, then regional determination module 203 is determined respectively the region-of-interest of each described concern key element according to the geographic coordinate scope of each described concern key element, cache module 204 again buffer memory comprises data in the buffer area that each described region-of-interest consists of, selected a special layer owing to the user is every, afterwards some operations generally all are relevant with the data of this special layer, and the present invention program is to having carried out buffer memory to the key element of respectively paying close attention to that should special layer, even large span is moved electronic chart, also can the data of paying close attention in region-of-interest corresponding to key element be shown fast, greatly improved display efficiency.Simultaneously, because of the data of buffer memory for paying close attention to key element, the storage space that takies is also relatively less.
Wherein, the data procedures of cache module 204 buffer memory buffer areas can have different implementations, and the structural representation of the cache module 204 that consists of with a kind of implementation wherein as shown in Figure 8, this cache module 204 comprises searches unit 2041 and buffer unit 2042, wherein:
On the other hand, in order to realize better buffering effect, at cache module 204 in order to realize better buffering effect, in data corresponding to buffer memory region-of-interest, also can cushion the data of the near zone of region-of-interest, the near zone that is about to each region-of-interest is also as the part of buffer area, wherein, the near zone of each region-of-interest is to determine according to preset rules respectively, when carrying out buffer memory, search unit 2041 and search respectively the map section of the peripheral region that comprises each region-of-interest and correspondence, the map section that buffer unit 2042 cache lookups are arrived; Thereby, carrying out electronic chart when showing, the picture of region-of-interest and corresponding near zone is drawn after can both directly reading in the buffer zone; But, determine that the rule of the near zone of region-of-interest determines according to actual requirement, consider buffering effect and storage size such as needs, this is because the scope of near zone is larger, needs the data of buffering just more, when showing, need the real-time data that read from hard disk just fewer, speed is just than comparatively fast like this, but the scope of near zone is larger, and the storage space that need to take is also just larger.
In addition, foregoing concern key element generally comprises an object, line object, in the face of resembling, and correspondingly, referring to shown in Figure 9, regional determination module 203 specifically can comprise following several unit:
Point subject area determining unit 2031 is for the region-of-interest of determining the some object;
Line object zone determining unit 2032 is for the region-of-interest of determining line object;
In the face of resembling regional determining unit 2033, be used for determining the region-of-interest of some object.
Point subject area determining unit 2031 can be defined as the correspondence position of the coordinate figure of an object region-of-interest of this object; The square region that line object zone determining unit 2032 can consist of longitude scope and the latitude scope of line object is defined as the region-of-interest of this line object, as shown in Figure 2, suppose that the curve among the figure is the concern key element, then the region-of-interest of this line object then is the zone shown in the dotted line frame among the figure, accordingly, needing the map section of buffer memory can be that map in the bold box zone shown in Figure 3 is cut into slices; Can will be defined as this in the face of the region-of-interest of picture in the face of the zone that consists of as each summit of wanting in the face of resembling regional determining unit 2033, as shown in Figure 4, suppose that triangle, rhombus and hexagon among the figure are the concern key element, then triangle, rhombus and hexagonal region-of-interest are respectively the zone that each polygon surrounds, be the dash area among Fig. 4, accordingly, needing the map section of buffer memory can be that map in the bold box zone shown in Figure 5 is cut into slices.
As shown in Figure 2, region-of-interest scope by the definite line object of aforementioned manner is larger, there are data corresponding to subregion can not carry out buffer memory, caused the wasting of resources, for this reason, corresponding improved procedure can be: line object zone determining unit 2032 is divided into some segments with this line object first, and then the set of the square region that is made of longitude scope and the latitude scope of these segments is as the region-of-interest of this line object, as shown in Figure 6, adopt this mode, can greatly save Installed System Memory, wherein, segmented mode can have different implementations, as keep every segment to have identical longitude span, perhaps keep every segment to have identical latitude span, perhaps keep every segment to have identical length etc., do not repeat them here.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the data cache method for GIS is characterized in that, comprises the steps:
Reception figure layer is chosen information, and described figure layer is chosen the name information that information comprises special layer;
Determine respectively to pay close attention to key element according to the special layer data corresponding with described name information;
Determine respectively the region-of-interest of each described concern key element according to the geographic coordinate scope of each described concern key element;
Buffer memory comprises the data in the buffer area that each described region-of-interest consists of.
2. the data cache method for GIS according to claim 1, it is characterized in that, described buffer memory comprises that the data in the buffer area that each described region-of-interest consists of comprise step: search respectively the map section that comprises each described region-of-interest, the map that cache lookup is arrived is cut into slices.
3. the data cache method for GIS according to claim 1 is characterized in that, described buffer area also comprises respectively the near zone of each described region-of-interest of determining according to preset rules.
4. the data cache method for GIS according to claim 1 is characterized in that, described concern key element comprises an object, line object, in the face of resembling.
5. the data cache method for GIS according to claim 4 is characterized in that: the region-of-interest of described some object is the coordinate figure correspondence position of this object; The region-of-interest of described line object is the square region that the longitude scope of this line object and latitude scope consist of, and perhaps the region-of-interest of described line object be the set with the square region of the longitude scope of each section after this line object segmentation and latitude scope formation; The zone that the described region-of-interest of wanting in the face of picture consists of for each summit in the face of picture.
6. the data buffering system for GIS is characterized in that, comprising:
Receiver module is used for reception figure layer and chooses information, and described figure layer is chosen the name information that information comprises special layer;
The key element determination module is used for determining respectively to pay close attention to key element according to the special layer data corresponding with described name information;
The zone determination module is for the region-of-interest of determining respectively each described concern key element according to the geographic coordinate scope of each described concern key element;
Cache module is for the data that comprise in the buffer area that each described region-of-interest consists of.
7. the data buffering system for GIS according to claim 6 is characterized in that, described cache module comprises:
Search the unit, be used for searching respectively the map section that comprises each described region-of-interest;
Buffer unit is used for that buffer memory is described searches the map section that the unit finds.
8. the data buffering system for GIS according to claim 6 is characterized in that, described buffer area also comprises respectively the near zone of each described region-of-interest of determining according to preset rules.
9. the data buffering system for GIS according to claim 6 is characterized in that, described regional determination module comprises:
Point subject area determining unit is for the region-of-interest of determining the some object;
Line object zone determining unit is for the region-of-interest of determining line object;
In the face of resembling regional determining unit, be used for determining the region-of-interest of some object.
10. the data buffering system for GIS according to claim 9 is characterized in that, the coordinate figure correspondence position that described some subject area determining unit will be put object is defined as the region-of-interest of this object; The square region that described line object zone determining unit consists of longitude scope and the latitude scope of line object is defined as the region-of-interest of this line object, and the set of the square region that perhaps longitude scope and the latitude scope of each section after this line object segmentation is consisted of is defined as the region-of-interest of this line object; Describedly be defined as the region-of-interest that this faces picture in the face of resembling the zone that regional determining unit will consist of in the face of each summit that picture is wanted.
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| CN105278800A (en) * | 2014-07-09 | 2016-01-27 | 方正国际软件(北京)有限公司 | Method, system and equipment for displaying thematic map hotspot |
| 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 |
| CN109981740A (en) * | 2019-02-25 | 2019-07-05 | 湖北金拓维信息技术有限公司 | A kind of distribution image data multi-level buffer method |
| CN111651491A (en) * | 2020-08-04 | 2020-09-11 | 华夏天信（北京）智能低碳技术研究院有限公司 | Data acquisition method based on mine holographic graph |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105278800A (en) * | 2014-07-09 | 2016-01-27 | 方正国际软件(北京)有限公司 | Method, system and equipment for displaying thematic map hotspot |
| 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 |
| CN105320692B (en) * | 2014-07-31 | 2019-08-20 | 中国电信股份有限公司 | A kind of method, apparatus and system that mass data is presented |
| CN109981740A (en) * | 2019-02-25 | 2019-07-05 | 湖北金拓维信息技术有限公司 | A kind of distribution image data multi-level buffer method |
| CN111651491A (en) * | 2020-08-04 | 2020-09-11 | 华夏天信（北京）智能低碳技术研究院有限公司 | Data acquisition method based on mine holographic graph |
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