CN102222065A - Spatial information service system based on geographical index - Google Patents
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Abstract
The invention relates to a spatial information service based on a geographical index, comprising a grid server, a mobile client and a grid agent server; the grid server is provided with a first spatial information local index mechanism; the mobile client is provided with a second information local index mechanism; the grid agent server is provided with a globally distributed index mechanism; the grid server registers on the grid agent server, and simultaneously sends the relevant information of a respective spatial resource to the grid agent server; the grid agent server stores the global index information of the spatial resource of each grid server; the mobile client sends the request of spatial information mobile grid service to the grid agent server; and the grid agent server judges which grid server of requested data to send the request to the owned grid server according to the requested place information. Compared with the prior art, the spatial information service based on the geographical index has the advantages of promoting the locating speed of spatial information resources, and the like.
Description
Technical field
The present invention relates to a kind of spatial Information Service system, especially relate to a kind of spatial Information Service system based on geographical index.
Background technology
In carrying out spatial Information Service, network geographic information system (WebGIS) makes that people can sharing and service based on Internet implementation space information.Yet, tradition Geographic Information System and WebGIS architecture are sealed, be based on the C/S or the B/S structure of triangular web mostly, different WebGIS is cooperation not, make Geographic Information System (GIS) system that people set up with huge cost, just as the deepwater isolated island one by one of data/information, hindered fully sharing and the service of moving of spatial information, caused the situation of " data magnanimity, information deficiency ".Grid (Grid) attempts to realize comprehensive UNICOM of online various resources, finally realizes resource sharing and collaborative work on the network virtual environment, eliminates resource isolated island or information island.The core of grid is exactly grid computing, utilizes the Internet that the various computing machines that wide area distributes are compiled, and forms a virtual supercomputer and carries out finding the solution of problem.
Spatial information moves the very important ingredient of service grid environment as grid GIS, can provide spatial Information Service anywhere or anytime for the public, and move towards daily life gradually.1996, FCC (FCC) requires mobile operator to offer cellphone subscriber 911 (emergent special service number) service, promptly can the locating cellphone caller in time rescue service so that the user to be provided, this is actual to be exactly the beginning that spatial information moves service.Chinese 863 Program in 2002 have been listed the research of " space information grid (SIG) frame system and critical support technology ", " based on the city space information application service system of SIG framework " and projects such as " spatial information move the service colligate technology ", particularly setting up of " spatial information moves the service colligate technology " project played very big facilitation for spatial information moves service in Development in China.
Move in the service grid environment at spatial information, spatial information is mesh services " blood ", and during mobile service client request spatial information, its request efficient mainly depends on the space information-distribution type dispositions method of mesh services.
Traditional spatial information dispositions method generally is " concentrating-distributed ", and promptly all spatial informations are concentrated and are deployed on the station server, and client visits server by distributed way.This method has embodied great superiority at aspects such as spatial information unified management, seamless integrated, macroanalysis.Yet its shortcoming also can not be ignored: (1) spatial information magnanimity makes that server task is heavy, processing speed waits slowly; (2) ignored the distributivity of spatial information itself, made that the trend of the times of spatial information is lower, spatial information upgrades in the administrative area of lower grade, remains not data updated and use in the higher level administrative area; (3) dirigibility is relatively poor, can not walk abreast and distributed work, when carrying out Data Update, can not carry out other work.
Another kind method is exactly the peer host distributed deployment, and so-called peer host just all is being deployed in all spatial informations on a plurality of distributed servers, and each distributed server has identical space information resource, logically is reciprocity therefore.This space information-distribution type dispositions method all has complete spatial information on each distributed server, each distributed server all possesses the ability that all spatial Information Service service logics independently are provided.When the client-access server, a plurality of distributed servers can be alleviated the pressure of a server, thereby improve the efficient of spatial Information Service, and each server can walk abreast and distributed work, a server upgrades, and does not influence other server and continues to provide service.Also there is shortcoming in this mode: (1) each server all needs to retrieve from the spatial information of magnanimity when carrying out the spatial information operation, and efficient is lower, thereby each server stress is all bigger; When (2) spatial information upgrades, need upgrade each server, and the actuality of spatial information is lower.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of spatial Information Service system based on geographical index that has improved the efficient of space information resource locating speed and resource service for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of spatial Information Service system based on geographical index, it is characterized in that, comprise grid service server, mobile client, the grid acting server, described grid service server is provided with the first spatial information local index mechanism, described mobile client is provided with the second information local index mechanism, described grid acting server is provided with overall distributed index mechanism, described grid service server is registered to the grid acting server, space resources relevant information with self sends to the grid acting server simultaneously, the space resources global index information of this each grid service server of grid proxy server stores, described mobile client sends the service of request spatial information mobile grid to the grid acting server, the grid acting server is judged institute's which grid service server of request msg according to the positional information of being asked, and this request is sent on the grid service server under it.
The described first spatial information local index mechanism is as follows:
(1) workspace index set, in the grid service server deployment file, a plurality of workspace objects can be arranged, each workspace object has the attribute of oneself, whether comprise demonstration, LOD coefficient, boundary rectangle, whether utilization shows attribute, filters out the current workspace object that does not show, utilizes the boundary rectangle attribute to filter out not workspace object at current query context, utilize LOD coefficient attribute, filter out not workspace object in the LOD indication range;
(2) geographic grid index set, each workspace object is carried out the division of geographic grid on spatial dimension, and utilize the boundary rectangle of geographic grid and spatial object, spatial data in this grid is set up index according to the data organization mode consistent with the workspace data set, by the boundary rectangle of each geographic grid, filter out not geographic grid at current query context;
(3) geographic grid quaternary tree index set on the basis of geographic grid index, is set up the quaternary tree index of geographic grid index, by recursion cycle, further reduces the geographic grid of practical operation;
(4) figure layer index set, when indexing actual space data sets, demonstration by each figure layer in the figure layer index is attribute, LOD coefficient attribute, boundary rectangle attribute whether, further will not show, not in the LOD indication range, do not fall at the figure of space querying scope layer object filter;
(5) point, line, surface index set by set up the point, line, surface index in each figure layer index, reduces the spatial object scope when carrying out searching by the spatial object type;
(6) R+ tree object indexing when indexing each concrete spatial object, can be judged with the space querying scope according to the boundary rectangle of this spatial object, filters not the spatial object at current query context, further the spatial object scope of reduction operation.
The described second information local index mechanism comprises two classes:
1) when carrying out static state deployment basic space information in mobile client, second information local index mechanism is identical with the first spatial information local index mechanism, when retrieving, spatial information in its internal memory is dynamic, and spatial information physically is the grid blocking organization, take the resource of " not using at most recently " to eliminate mechanism, the index information of spatial information is preserved in internal memory, and mark spatial information pointed is in the internal memory or in storage card;
2) when mobile client is asked spatial information in real time, the second information local index mechanism has been saved the set of geographic grid quaternary tree index, and the spatial information local index mechanism of other index mechanism and grid service server is consistent.
Described grid acting server judges to adopt the algorithm of point in polygon in institute's which grid service server process of request msg according to the positional information of being asked.
Compared with prior art, the present invention has the advantages such as efficient that improved space information resource locating speed and resource service.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the first spatial information local index mechanism structure synoptic diagram of grid service server of the present invention;
Fig. 3 is of the present invention at polygon algorithm synoptic diagram.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of spatial Information Service system based on geographical index, comprise grid service server 3, mobile client 1, grid acting server 2, described mobile client 1 is connected with grid acting server 2 by communication network 4, described grid service server 3 is connected with grid acting server 2 by Internet 5, described grid service server 3 is provided with the first spatial information local index mechanism, described mobile client 1 is provided with the second information local index mechanism, described grid acting server 2 is provided with overall distributed index mechanism, described grid service server 3 is to 2 registrations of grid acting server, space resources relevant information with self sends to grid acting server 2 simultaneously, the space resources global index information of these grid acting server 2 each grid service servers 3 of storage, described mobile client 1 sends the service of request spatial information mobile grid to grid acting server 2, grid acting server 2 is judged institute's which grid service server of request msg 3 according to the positional information of being asked, and this request is sent on the grid service server 3 under it.
It is the spatial data distributed storage method of grid services layer that spatial information is disposed, and mainly is that the spatial data with service grid environment is stored on each distributed grid service server 3.The spatial information index then is the access efficiency that improves the spatial data of these distributed deployments, comprise that not only each spatial information moves service grid environment member local spatial information index, and comprise the global space information-distribution type index of each distributed grid server 3 spatial datas of grid computing node.Therefore spatial information moves service grid environment, not only will consider each grid member local spatial information index, also wants the global space information-distribution type index of considering gridding computing node, mainly contains three class index mechanism:
One, the first spatial information local index mechanism of grid service server 3:
Move in the service grid environment Distribution calculation model at spatial information, grid service server 3 is nodes of disposing concrete space information resource, therefore, its index mechanism is the efficient of the whole mesh services of influence directly, as shown in Figure 2, (1) workspace index set, in the grid service server deployment file, a plurality of workspace objects can be arranged, each workspace object has the attribute of oneself, whether comprise demonstration, the LOD coefficient, boundary rectangle, whether utilization shows attribute, filter out the current workspace object that does not show, utilize the boundary rectangle attribute to filter out, utilize LOD coefficient attribute, filter out not workspace object in the LOD indication range not at the workspace object of current query context;
(2) geographic grid index set, each workspace object is carried out the division of geographic grid on spatial dimension, and utilize the boundary rectangle of geographic grid and spatial object, spatial data in this grid is set up index according to the data organization mode consistent with the workspace data set, by the boundary rectangle of each geographic grid, filter out not geographic grid at current query context;
(3) geographic grid quaternary tree index set on the basis of geographic grid index, is set up the quaternary tree index of geographic grid index, by recursion cycle, further reduces the geographic grid of practical operation;
(4) figure layer index set, when indexing actual space data sets, demonstration by each figure layer in the figure layer index is attribute, LOD coefficient attribute, boundary rectangle attribute whether, further will not show, not in the LOD indication range, do not fall at the figure of space querying scope layer object filter;
(5) point, line, surface index set by set up the point, line, surface index in each figure layer index, reduces the spatial object scope when carrying out searching by the spatial object type;
(6) R+ tree object indexing when indexing each concrete spatial object, can be judged with the space querying scope according to the boundary rectangle of this spatial object, filters not the spatial object at current query context, further the spatial object scope of reduction operation.
Two, the second spatial information local index mechanism of mobile client 1
The first spatial information local index mechanism of grid service server 3 is the fundamental space information index mechanism that spatial information moves service grid environment.In varying environment, the second spatial information local index mechanism of spatial information mobile client is then slightly different.
When carrying out static state deployment basic space information in mobile client 1, the first spatial information local index mechanism of its second spatial information local index mechanism and grid service server is the same, but consider the internal memory restriction of mobile device, its spatial information in internal memory being much smaller than desktop GIS environment, therefore when carrying out index, spatial information in its internal memory is dynamic, and spatial information physically is the grid blocking organization.When internal memory reaches restriction on mobile device, promptly take the resource of " not using at most recently " to eliminate mechanism, the index information of spatial information is still preserved in internal memory, is in the internal memory but want mark spatial information pointed, still in storage card.Eliminate mechanism for realizing resource, can use a chained list to come save mesh data directory relevant information, and most recently used data grids index is placed on linked list head, untapped at most data grids index is placed on the chained list tail, when needs were removed spatial information from internal memory, the pairing spatial information of index information that is about to the storage of chained list tail was removed from internal memory.
When mobile client 1 is asked spatial information in real time, because the spatial information that returns is the workspace data set of grid piecemeal, and workspace data set itself does not comprise grid index and quaternary tree index, think that reducing mobile device is generating the time that the quaternary tree index is consumed, mobile client 1 has been saved this step of quaternary tree index, and the first spatial information local index mechanism of other index mechanism and grid service server 3 is consistent.When returning the workspace data set of grid piecemeal, promptly set up the grid index information corresponding, and to write down this grid be open mode in internal memory with the boundary rectangle of workspace data set.When needs are removed data in the internal memory, adopt the resource replacement policy, spatial information in the internal memory that will remove stores the mobile device storage card into earlier, and this grid data is set in grid index in local resource open mode not, store the physics index information of this grid data simultaneously, in internal memory, remove this grid data then.When visiting this grid data once more, just can directly call this grid data of local resource according to grid index information.
Three, the overall distributed index mechanism of grid acting server 2
When the service of request spatial information mobile grid, grid acting server 2 judges that according to institute's request position information this request msg belongs in which grid service server 3 compasss of competency, and this is sent on the grid service server under it with the spatial information request then.This deterministic process of grid acting server 2 has mainly been used the algorithm of point in polygon, as shown in Figure 3.The thought of this algorithm is a bit to make horizontal rays arbitrarily to the right, intersecting with polygon, if the intersection point number is an even number, this is outside polygon so, if the intersection point number is an odd number, this is in polygon so.This algorithm has versatility, as Fig. 3 (a) (b) shown in the figure.
Claims (4)
1. spatial Information Service system based on geographical index, it is characterized in that, comprise grid service server, mobile client, the grid acting server, described grid service server is provided with the first spatial information local index mechanism, described mobile client is provided with the second information local index mechanism, described grid acting server is provided with overall distributed index mechanism, described grid service server is registered to the grid acting server, space resources relevant information with self sends to the grid acting server simultaneously, the space resources global index information of this each grid service server of grid proxy server stores, described mobile client sends the service of request spatial information mobile grid to the grid acting server, the grid acting server is judged institute's which grid service server of request msg according to the positional information of being asked, and this request is sent on the grid service server under it.
2. a kind of spatial Information Service system based on geographical index according to claim 1 is characterized in that, the described first spatial information local index mechanism is as follows:
(1) workspace index set, in the grid service server deployment file, a plurality of workspace objects can be arranged, each workspace object has the attribute of oneself, whether comprise demonstration, LOD coefficient, boundary rectangle, whether utilization shows attribute, filters out the current workspace object that does not show, utilizes the boundary rectangle attribute to filter out not workspace object at current query context, utilize LOD coefficient attribute, filter out not workspace object in the LOD indication range;
(2) geographic grid index set, each workspace object is carried out the division of geographic grid on spatial dimension, and utilize the boundary rectangle of geographic grid and spatial object, spatial data in this grid is set up index according to the data organization mode consistent with the workspace data set, by the boundary rectangle of each geographic grid, filter out not geographic grid at current query context;
(3) geographic grid quaternary tree index set on the basis of geographic grid index, is set up the quaternary tree index of geographic grid index, by recursion cycle, further reduces the geographic grid of practical operation;
(4) figure layer index set, when indexing actual space data sets, demonstration by each figure layer in the figure layer index is attribute, LOD coefficient attribute, boundary rectangle attribute whether, further will not show, not in the LOD indication range, do not fall at the figure of space querying scope layer object filter;
(5) point, line, surface index set by set up the point, line, surface index in each figure layer index, reduces the spatial object scope when carrying out searching by the spatial object type;
(6) R+ tree object indexing when indexing each concrete spatial object, can be judged with the space querying scope according to the boundary rectangle of this spatial object, filters not the spatial object at current query context, further the spatial object scope of reduction operation.
3. a kind of spatial Information Service system based on geographical index according to claim 1 is characterized in that, the described second information local index mechanism comprises two classes:
1) when carrying out static state deployment basic space information in mobile client, second information local index mechanism is identical with the first spatial information local index mechanism, when retrieving, spatial information in its internal memory is dynamic, and spatial information physically is the grid blocking organization, take the resource of " not using at most recently " to eliminate mechanism, the index information of spatial information is preserved in internal memory, and mark spatial information pointed is in the internal memory or in storage card;
2) when mobile client is asked spatial information in real time, the second information local index mechanism has been saved the set of geographic grid quaternary tree index, and the spatial information local index mechanism of other index mechanism and grid service server is consistent.
4. a kind of spatial Information Service system according to claim 1 based on geographical index, it is characterized in that described grid acting server judges to adopt the algorithm of point in polygon in institute's which grid service server process of request msg according to the positional information of being asked.
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| CN103927933A (en) * | 2013-01-14 | 2014-07-16 | 北京中交兴路信息科技有限公司 | Method and device for rendering mass moving targets |
| CN104239377A (en) * | 2013-11-12 | 2014-12-24 | 新华瑞德（北京）网络科技有限公司 | Platform-crossing data retrieval method and device |
| CN105138560A (en) * | 2015-07-23 | 2015-12-09 | 北京天耀宏图科技有限公司 | Multilevel spatial index technology based distributed space vector data management method |
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| CN110516119A (en) * | 2019-08-27 | 2019-11-29 | 西南交通大学 | A kind of organizational scheduling method, device and the storage medium of natural resources contextual data |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103685380A (en) * | 2012-09-12 | 2014-03-26 | 北京超图软件股份有限公司 | Geographic information data distribution service method and system |
| CN103685380B (en) * | 2012-09-12 | 2017-12-08 | 北京超图软件股份有限公司 | The distribution method of servicing and system of geographic information data |
| CN103927933A (en) * | 2013-01-14 | 2014-07-16 | 北京中交兴路信息科技有限公司 | Method and device for rendering mass moving targets |
| CN103491164A (en) * | 2013-09-22 | 2014-01-01 | 乌鲁木齐新科讯达信息技术有限公司 | Internet same-city community service system |
| CN104239377A (en) * | 2013-11-12 | 2014-12-24 | 新华瑞德（北京）网络科技有限公司 | Platform-crossing data retrieval method and device |
| CN105138560A (en) * | 2015-07-23 | 2015-12-09 | 北京天耀宏图科技有限公司 | Multilevel spatial index technology based distributed space vector data management method |
| CN105554100A (en) * | 2015-12-11 | 2016-05-04 | 中国烟草总公司广东省公司 | Distribution service method of tobacco growing field geographic information data and system |
| CN108009265A (en) * | 2017-12-15 | 2018-05-08 | 中国公路工程咨询集团有限公司 | A kind of space data index method under cloud computing environment |
| CN108009265B (en) * | 2017-12-15 | 2020-06-16 | 中国公路工程咨询集团有限公司 | Spatial data indexing method in cloud computing environment |
| CN109379402A (en) * | 2018-09-11 | 2019-02-22 | 句容市凯特电力电器有限公司 | A kind of location-based mobile service system |
| CN110516119A (en) * | 2019-08-27 | 2019-11-29 | 西南交通大学 | A kind of organizational scheduling method, device and the storage medium of natural resources contextual data |
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Application publication date: 20111019 |