CN103699641A - Method for accessing different raster map services - Google Patents
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Abstract
The invention provides a method for accessing different raster map services. The method includes the steps: firstly, acquiring third-party raster map setting parameters; secondly, building association relations among map parameters in a system and the third-party raster map parameters, building association algorithms for the association relations and storing the association algorithms, calling the association algorithms when third-party raster maps are accessed, and converting the third-party raster map data into data based on the current system. Third-party raster map data services are accessed, so that business application developers do not need to care sources of the raster maps, only need to perform secondary development based on functions of the raster map data services and do not need to perform secondary development based on the functions of a plurality of third-party raster map services, a plurality of different third-party raster map data services can be accessed, repetitive multiple secondary developments are omitted, the method is simple and convenient to use and maintain, subsequent newly-presented third-party raster maps can be simply configured and then accessed, and the extension performance and compatibility of the system are further improved.
Description
Technical field
The present invention relates to a kind of network map service method, specifically a kind of system and method that accesses dissimilar grating map service.
Background technology
Along with the development of geographical information technology, Geographic Information System (GIS) is played a greater and greater role, and is widely used in the services such as location, search, has therefore also occurred the multiple Map Services based on GIS.At present, much there is grating map service in GIS manufacturer, as Baidu's map, Google Maps, high moral map etc., these Map Services manufacturers are also for needing the company of Geographic Information System that map application interface is provided, as ESRI company, hypergraph company, PGIS platform, Baidu's map, Google Maps, day map etc. all provide application programming interfaces (being called for short API).
In Chinese patent application CN1971560A, disclosing a kind of source data of grid electron map generates, the method that tissue and target data generate, realize mating and completing of map and GPS positional information on server, utilize map vector by map vector engine, to generate the grating map file of plurality of specifications, form grating map source data, grating map file usage data storehouse or file index, coordinate and the index-name of storage grating map file, by message mechanism, transmit the specification requirement of target grating map and latitude and longitude information, map generation system will be retrieved from database or file, obtain grating map source data, and cut out splicing generation target grating map and also pack and be delivered to intended application.A kind of method that builds grating map is provided in this scheme.Current grating map is all that each manufacturer researches and develops voluntarily, so the configuration mode of its data message, Data Source etc. are all not identical.
Because the exploitation of each grating map product does not in the market have unified standard, when other developers are when developing other business application systems based on these grating maps, need to develop separately for the application programming interfaces of different grating maps, not only increase cost of development, also increased maintenance and the use cost in later stage.
Summary of the invention
For this reason, technical matters to be solved by this invention is that business application system of the prior art need to develop separately for different grating maps, thereby proposes a kind of system and method that can access a plurality of different grating maps services.
For solving the problems of the technologies described above, the invention provides a kind of method that accesses different grating map services, comprise the steps:
Obtain the parameter of third party's grating map, described parameter comprises cuts figure initial point, every class resolution ratio, coordinate system, projection pattern;
Set up the corresponding incidence relation between the ranks number of the described parameter generating of described third party's grating map, ranks that map rank produces with the parameter configuring in native system number, map rank, and set up association algorithm storage according to this correspondence incidence relation;
When calling third party's grating map, import ranks number, map rank and name map into;
Call the described association algorithm that this third party's grating map is corresponding, the information of this third party's grating map is converted to the information of the rear corresponding native system of its access.
The method of the different grating map services of described access, is stored in described association algorithm in configuration file, and is this name map by the name nominating of configuration file.
The method of the different grating map services of described access, the described process of calling the described association algorithm that this third party's grating map is corresponding, comprise that title reads corresponding configuration file according to the map, rank reads algorithm corresponding to third party's grating map in corresponding configuration file according to the map.
The method of the different grating maps of described access service, the described information by this third party's grating map is converted to the process of the information of corresponding native system after its access, also comprises that type according to the map shows.
The method of the different grating map services of described access, described map style comprises: map vector, photomap or 2.5 dimension maps.
The method of the different grating maps of described access service, described in latitude and longitude coordinates, longitude and latitude (0,0) or the longitude and latitude (180,90) in the upper left corner or the lower left corner when cutting figure initial point and being city full figure.
The method of the different grating map services of described access, described coordinate is WGS84, Xi'an 80, BJZ54, CGCS2000.
The method of the different grating maps of described access service, described projection pattern is that longitude and latitude is delivered directly, Web Mercator, Lambert, Gauss Ke Lvge.
The method of the different grating maps of described access service, the parameter configuring in native system is: longitude and latitude (180,90) coordinate for cutting figure initial point, 0 class resolution ratio is 2, projection pattern is that longitude and latitude is delivered directly, coordinate is WGS84.
The method of the different grating map services of described access, described third party's grating map is PGIS grating map, OGCWMS map, day map, MyGIS map, ArcGIS Server map and other independently developed grating maps.
Technique scheme of the present invention has the following advantages compared to existing technology,
(1) the invention provides a kind of method that accesses different grating map services, first obtain the parameter that third party's grating map arranges, then set up the incidence relation of map parameter and third party's grating map parameter in native system, this incidence relation is set up to association algorithm storage, when access third party grating map, call this association algorithm, these third party's grating map data are converted to the data based on current system, thereby realized the access of third party's grating map data, services, service application developer need not be concerned about the source of grating map like this, only need to the function based on this grating map service carry out secondary development, need to the function based on the service of a plurality of third party's grating map not carry out secondary development, can realize the access of a plurality of different third party's grating map services, do not need to carry out the repeatedly secondary development of repetition, operation and maintenance is all simple and convenient, and for follow-up emerging third party's grating map, also after can realizing easy configuration, access, scalability and the compatible performance of this system are further improved.This scheme can all realize all desktop application, web application, mobile application based on this grating map service, realized the effect of a set of figure of three ends, in addition, the service developer of this scheme does not need to be concerned about source and the docking mode of grating map data, has reduced the technical requirement of developer to GIS.
(2) method of the different grating map services of access of the present invention, described association algorithm is stored in configuration file, and be this name map by the name nominating of configuration file, while making subsequent calls in this way, name is found a great convenience and can be selected easily according to the map, when supporting a plurality of third party's grating map, when setting up, store, calling, all facilitate.
(3) method of the different grating map services of access of the present invention, cut figure initial point, every class resolution ratio, coordinate system, projection pattern according to different grating map types and internal data configuration, select corresponding appropriate mode, the accuracy after the data that improved the grating map of access transform.
Accompanying drawing explanation
For content of the present invention is more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the process flow diagram of an embodiment of the method for the different grating maps of access of the present invention service;
Fig. 2 is the process flow diagram that calls third party's grating map of another embodiment of the method for the different grating map services of access of the present invention;
Fig. 3 is the access block diagram of the method for the different grating map services of access of the present invention.
Embodiment
embodiment 1:
The present embodiment provides a kind of method that accesses different grating map services, based on cutting the technological means such as figure initial point, resolution, coordinate system, projection, by increase adaptation algorithm in the service of third party's grating map, the service of access third party grating map, the convenient raster data source of expanding business application system, solve the problem of the application programming interfaces overlapping development of business application system based on different third party's grating maps, reduced development amount, development cost and the maintenance cost of business application system.
The method of the different grating map services of access in the present embodiment, is mainly divided into according to third party's grating map and sets up two processes of calling after adaptation algorithm and access third party grating map.Process flow diagram as shown in Figure 1.
(1) first, for the service of access third party grating map, what developer need to understand the service of third party's grating map cuts rule map or loading principle, then obtain the configuration parameter of third party's grating map, these parameters comprise cuts figure initial point, every class resolution ratio, coordinate system and projection pattern etc., specific as follows:
1.. cut the initial point of figure: the latitude and longitude coordinates in the upper left corner or the lower left corner when generally cutting figure initial point and being city full figure, also having with longitude and latitude (0,0) coordinate is that initial point or longitude and latitude (180,90) coordinate are for initial point.What don't work as the initial point of cutting figure, developer needs to link up or obtain according to the configuration file of grating map service with third party's grating map service provider the initial point of cutting figure.
2.. every class resolution ratio: map rank refers to this map corresponding rank while zooming in or out, and General maps can have a plurality of ranks, as from 0 grade to 9 grades, the region that map shows dwindles gradually, and the target of demonstration is amplified gradually.General adjacent two-level resolution is all 2 integral multiple, only need to know that certain class resolution ratio just can know the resolution of other grades.No matter what certain class resolution ratio is, developer needs link up or obtain every class resolution ratio according to the configuration file of grating map service with third party's grating map service provider.
3.. the coordinate system of grating map: coordinate system is generally WGS84, Xi'an 80, BJZ54(Beijing 54 Coordinate System), CGCS2000(country earth coordinates 2000) etc., developer needs and third party's grating map service provider is linked up or what coordinate system what according to the configuration file of grating map service, obtain the other side's employing is.
4.. the projection pattern of grating map: the projection pattern of grating map has multiple, as longitude and latitude is delivered directly, Web Mercator, Lambert, Gauss Ke Lvge etc.Developer also needs to link up with third party's grating map service provider or what projection pattern what according to the configuration file of grating map service, obtain that the other side adopts is.
By the provider of third party's grating map or according to its configuration file, obtained the above-mentioned parameter of this third party's grating map.
(2) find out initial point, resolution, the coordinate system of third party's grating map service Yin Qietu, what correspondence incidence relation ranks that the relevant parameter in ranks that the difference of projection produces number, rank and native system produces number, rank have, then write different adaptive association algorithms according to corresponding incidence relation.
As in native system for realize the whole nation figure, the configuration parameter of employing is: longitude and latitude (180,90) coordinate is for cutting figure initial point, and 0 class resolution ratio is 2, employing longitude and latitude deliver directly, coordinate is WGS84.
So, just need to find out initial point, resolution, the coordinate system of third party's grating map service Yin Qietu, ranks that the difference of projection produces number, rank and in order to realize the figure in the whole nation, adopt longitude and latitude (180,90) coordinate is for cutting figure initial point, 0 class resolution ratio is 2, employing longitude and latitude is delivered directly, and coordinate is that what corresponding relation the ranks that produce of WGS84 number, rank have, then write different adaptation algorithm according to corresponding relation.
The parameter that adaptation algorithm is needed leaves in configuration file, and the service of fast and easy access third party grating map, can be this name map by the name nominating of configuration file.
(3), when calling third party's grating map, import ranks number, map rank and name map into.
(4) according to the name map importing into, read corresponding configuration file, rank reads algorithm corresponding to third party's grating map in corresponding configuration file according to the map, so can call the described association algorithm that this third party's grating map is corresponding, the information of this third party's grating map is converted to the information of the rear corresponding native system of its access.Like this, engine map does not need to consider grating map source, only need import the little picture that ranks number, map grade, name map just can obtain a 256*256 into.When showing, type according to the map shows, as be shown as map vector or photomap or 2.5 dimension maps, map vector as the map isovector figure of Baidu, affecting map is the figure that takes photo by plane via satellite, and map style is selected according to the type setting in third party's grating map or obtained according to its corresponding configuration file.The process flow diagram of access third party grating map is shown in Fig. 2.
The method of the different grating map services of access described in the present embodiment, ranks that the engine map of independent research is imported into number, map grade convert ranks that the service of third party's grating map can identify number, map grade to, thus adaptive third party's grating map service and obtain the little picture of a 256*256.Accessed at present the service of the service of PGIS grating map, OGC WMS service, day Map Services, MyGIS service, ArcGIS Server, for other self-defining grating maps, also can realize access, Fig. 3 is shown in by access block diagram, grating map by access number of different types is served, and the service application such as desktop GIS engine, Web GIS engine, mobile GIS engine calling can be provided.
embodiment 2:
The present embodiment provides a kind of method of the PGIS of access grating map service.
PGIS platform is a set of Geographic Information System that each city, each province is freely handed down in the Ministry of Public Security.The service of PGIS grating map externally provides the picture of 256*256 and interface parameters to disclose in Servlet mode.The Ministry of Public Security wishes that the operation system of public security system constituent parts is all based on PGIS platform development, but due to the operation system of company, is not based on PGIS platform development but develops based on ArcGIS.If entirely based on PGIS platform development, the large especially cost of workload is high especially and restricted by PGIS platform, and operation system cannot be generalized to other industry.If PGIS platform is not disposed in some place, need so the operation system before safeguarding, namely Yi Ge company need to safeguard operation systems more than two covers.
For operation system is not subject to the restriction of PGIS platform, developer is at the tile data of bottom access PGIS grating map service rather than do secondary development based on PGIS platform feature.
The method that accesses the service of PGIS grating map in the present embodiment is as follows:
1. according to the reduction formula of engineer's scale, resolution, the resolution that the service of known PGIS grating map is 0 grade is about 2.Resolution=engineer's scale * pixel/(rice degree of turning), 0 grade of engineer's scale is 787996801.319121,1 pixel=0.0254/90 meter, 1 degree approximates 111194.872221777 meters.
2. according to PGIS grating map, cut figure instrument, what known PGIS grating map adopted is WGS84 coordinate system, is projected as longitude and latitude and delivers directly.
3. by the upper left corner-180,90 degree for initial point, are cut the vector data in certain city, by the tile of the ranks of certain point coordinate number and the service of rank request PGIS grating map, find that picture and the service of PGIS grating map that this mode cuts out are not same tile pieces, and differ larger.Through the comparison of different stage, find that X-axis differs 180 degree in the time of 9 grades, y axle differs 90 degree, grade of every increase, value just increases and is twice, so can determine, and PGIS cuts figure with the lower left corner 0,0 for initial point.
4. 0 class resolution ratio of knowing PGIS is 2, and cutting figure initial point is longitude and latitude (0,0), and map grade is also ascending order, therefore, only need write the algorithm that ranks number convert PGIS ranks number to;
Int EHLCol,EHLRow,EHLZoom,PGISCol,PGISRow,PGISZoom,tmpValue;
tmpValue = EHLZoom-9;
double dScale = Math.pow(2, tmpValue);
tmpValue = (int)Math.rint(180 * dScale);
PGISCol= EHLCol- tmpValue;
tmpValue = (int)Math.rint(90 * dScale);
PGISRow = tmpValue – EHLRow。
5. because the address of different cities PGIS grating map service is not identical, but it is identical to cut figure initial point, coordinate system, projection, every class resolution ratio, therefore, for the convenience of docking, developer provides an interface that only configures grating map address of service, and content format is as follows:
Http:// IP: port/PGIS_S_TileMapServer/Maps/default/EzMap.
6. the ranks number of certain grade in certain grade of ranks number replacement PGIS grating map being served.As follows in the address of 18 grades of default services:
Http:// IP: port/PGIS_S_TileMapServer/Maps/default/EzMap
Service=getImage& Type=RGB&Col=MCOL&Row=MROW&Zoom=18& V=0.3
The picture that completes a 256*256 obtains.
embodiment 3:
The present embodiment provides a kind of method of the OGC of access WMS grating map service.
The service of WMS grating map is to obtain map content by body of a map or chart, in order not allow three engine maps (desktop engine, Web engine, mobile engine) differentiate, write the function of calling the service of WMS grating map, we are in grating map service end and WMS docking, and three engine maps still obtain little picture according to the mode of ranks number, grade, name map.
The method of access OCG WMS grating map service is as follows:
1. according to the GetCapabilities method of WMS, obtain the essential information of figure layer, comprise coordinate system, projection, figure layer title etc.
According to the existing rule map of cutting to WMS services request figure layer, namely convert ranks number to corresponding scope;
Double resouletion=2D; The resolution of // corresponding the first order
int EHLZoom,EHLRow,EHLCol;
int tilewidth=256;
double pOriginx=-180D;
double pOriginy=90D;
double dScale = (resouletion / Math.pow(2.0D, this.EHLZoom))*tilewidth;
double dMinX = Math.abs(EHLCol * dScale-Math.abs());
double dMaxX = Math.abs((EHLCol + 1) * dScale-Math.abs(pOriginx));
double dMinY = Math.abs(EHLRow * dScale-Math.abs(pOriginy));
double dMaxY = Math.abs((EHLRow + 1) * dScale-Math.abs(pOriginy));
if(dMinY>dMaxY){
dScale=dMinY;
dMinY=dMaxY;
dMaxY=dScale;
}
if(dMinX>dMaxX){
dScale=dMinX;
dMinX=dMaxX;
dMaxX=dScale;
}
String strMBOX =dMinX + "," + dMinY + "," + dMaxX + "," + dMaxY。
3. because the address of the WMS service of different cities is not identical, but cut figure initial point, every class resolution ratio, coordinate system, projection complete can with we to cut rule map the same, therefore, for the convenience of docking, developer provides an interface that only configures WMS address of service, and content format is as follows:
Http:// IP: port/geoserver/wms LAYERS=bygis%3AAdm_Area & amp;
STYLES=&BGCOLOR=0x000000&TRANSPARENT=TRUE&FORMAT=image%2Fpng&TILED=true&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&SRS=EPSG%3A4326&BBOX=MBOX&WIDTH=MWIDTH&HEIGHT=MHEIGHT。
4. with the MBOX in address in the strMBOX replacement after conversion, picture width, high unity change 256 into.
5. the picture that completes a 256*256 obtains.
The method that accesses different grating map services is provided in the above-described embodiments, first obtain the parameter that third party's grating map arranges, then set up the incidence relation of map parameter and third party's grating map parameter in native system, this incidence relation is set up to association algorithm storage, when access third party grating map, call this association algorithm, these third party's grating map data are converted to the data based on current system, thereby realized the access of third party's grating map data, services, service application developer need not be concerned about the source of grating map like this, only need to the function based on this grating map service carry out secondary development, need to the function based on the service of a plurality of third party's grating map not carry out secondary development, can realize the access of a plurality of different third party's grating map services, do not need to carry out the repeatedly secondary development of repetition, operation and maintenance is all simple and convenient, and for follow-up emerging third party's grating map, also after can realizing easy configuration, access, scalability and the compatible performance of this system are further improved.This scheme can all realize all desktop application, web application, mobile application based on this grating map service, realized the effect of a set of figure of three ends, in addition, the service developer of this scheme does not need to be concerned about source and the docking mode of grating map data, has reduced the technical requirement of developer to GIS.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.And the apparent variation of being extended out thus or change are still among the protection domain in the invention.
Claims (10)
1. a method that accesses different grating map services, is characterized in that, comprises the steps:
Obtain the parameter of third party's grating map, described parameter comprises cuts figure initial point, every class resolution ratio, coordinate system, projection pattern;
Set up the corresponding incidence relation between the ranks number of the described parameter generating of described third party's grating map, ranks that map rank produces with the parameter configuring in native system number, map rank, and set up association algorithm storage according to this correspondence incidence relation;
When calling third party's grating map, import ranks number, map rank and name map into;
Call the described association algorithm that this third party's grating map is corresponding, the information of this third party's grating map is converted to the information of the rear corresponding native system of its access.
2. method according to claim 1, is characterized in that: described association algorithm is stored in configuration file, and is this name map by the name nominating of configuration file.
3. method according to claim 2, it is characterized in that: described in call the process of the described association algorithm that this third party's grating map is corresponding, comprise that title reads corresponding configuration file according to the map, rank reads algorithm corresponding to third party's grating map in corresponding configuration file according to the map.
4. according to the method described in claim 1 or 2 or 3, it is characterized in that: the described information by this third party's grating map is converted to the process of the information of the rear corresponding native system of its access, also comprises the process that type shows according to the map.
5. method according to claim 4, is characterized in that: described map style comprises: map vector, photomap or 2.5 dimension maps.
6. according to the arbitrary described method of claim 1-5, it is characterized in that: described in latitude and longitude coordinates, longitude and latitude (0,0) or the longitude and latitude (180,90) in the upper left corner or the lower left corner when cutting figure initial point and being city full figure.
7. according to arbitrary described method in claim 1-6, it is characterized in that: described coordinate is WGS84, Xi'an 80, BJZ54, CGCS2000.
8. according to arbitrary described method in claim 1-7, it is characterized in that: described projection pattern is that longitude and latitude is delivered directly, Web Mercator, Lambert, Gauss Ke Lvge.
9. according to arbitrary described method in claim 1-8, it is characterized in that: the parameter configuring in native system is: longitude and latitude (180,90) coordinate for cutting figure initial point, 0 class resolution ratio is 2, projection pattern is that longitude and latitude is delivered directly, coordinate is WGS84.
10. according to arbitrary described method in claim 1-9, it is characterized in that: described third party's grating map is PGIS grating map, OGCWMS map, day map, MyGIS map, ArcGIS Server map and other independently developed grating maps.
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| CN109408657A (en) * | 2018-11-13 | 2019-03-01 | 国家基础地理信息中心 | A kind of ultra-large spatial data rapid drafting method and system |
| CN109408657B (en) * | 2018-11-13 | 2021-02-02 | 国家基础地理信息中心 | Method and system for rapidly drawing super-large-scale spatial data |
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