CN105718498A - Mixed loading method and device for network gaps - Google Patents
Mixed loading method and device for network gaps Download PDFInfo
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Abstract
The invention relates to a mixed loading method and device for network gaps. The method comprises the steps as follows: a mixed loading request for the network gaps is received; the mixed loading request for the network gaps comprises requested and obtained position information, proportional scales and requested and loaded various service types; corresponding to-be-processed blocks of the position information under the proportional scales are obtained from corresponding map servers according to the service types; resolutions of the to-be-processed blocks are converted respectively according to the proportional scales of the to-be-processed blocks to obtain converted blocks; and the converted blocks are loaded to the same display interface according to the converted resolutions for display. The to-be-processed blocks can be obtained from different map servers of a plurality of GIS platforms; the resolutions of the to-be-processed blocks are uniformly converted; and the converted map blocks of the plurality of GIS platforms are loaded to the same display interface in a mixed manner for display, so that the compatibility of the network gaps of the plurality of GIS platforms is achieved.
Description
Technical field
The present invention relates to GIS-Geographic Information System (GeographicInformationSystem, GIS) field, the method and apparatus particularly relating to a kind of network map mix-loaded.
Background technology
At present loading online Map Services in client has various modes available, for instance international mainstream GIS platform ArcGIS, for another example domestic main flow GIS platform hypergraph (Supermap), middle ground number, Baidu's map etc..Above GIS platform is typically only capable to loading and meets open geospatial information alliance (OpenGeospatialConsortium, OGC) the network map tile service (OpenGISWebMapTileService of standard, WMTS), it is impossible to enough mix-loaded other producers Map Services.
GIS platform can only load Map Services or a few Map Services of our factory oneself both at home and abroad at present, it does not have a kind of general solution that can simultaneously load multiple manufacturer Map Services.
Summary of the invention
Technical problem
In view of this, the technical problem to be solved in the present invention is, the network map how multiple GIS platform of mix-loaded is issued.
Solution
In order to solve above-mentioned technical problem, according to one embodiment of the invention, it is provided that a kind of method of network map mix-loaded, including:
Receiving the request of network map mix-loaded, the request of described network map mix-loaded includes each COS of the positional information of acquisition request, scale and request of loading；
From corresponding map server, each pending segment that described positional information is corresponding under described scale is obtained according to each described COS；
The resolution of each described pending segment is changed by scale according to each described pending segment respectively, obtains each conversion segment；
According to the resolution after conversion, each described conversion segment is loaded into same display interface to display.
For above-mentioned method, in a kind of possible implementation, the request of described network map mix-loaded also includes the frame of reference, from corresponding map server, obtains, according to each described COS, each pending segment that described positional information is corresponding under described scale, including:
Under the described frame of reference, according to the scale of each described pending segment, resolution, picture precision and conversion parameter, the resolution of each described pending segment is changed respectively.
For above-mentioned method, in a kind of possible implementation, under the described frame of reference, according to the scale of each described pending segment, resolution, picture precision and conversion parameter, the resolution of each described pending segment is changed respectively, including:
The resolution that following formula 1 calculates each described pending segment is adopted to change respectively；
Wherein, Scale is the scale of described pending segment；
Resolution is the resolution of described pending segment；
DPI is the picture precision of described pending segment；
0.0254 is described conversion parameter.
For above-mentioned method, in a kind of possible implementation, the described frame of reference is the earth 2000 coordinate systems or Mercator's coordinate system, and each described COS includes at least two in a day map, ArcGIS, hypergraph map, middle ground map.
For above-mentioned method, in a kind of possible implementation, according to the resolution after conversion, each described conversion segment is loaded into same display interface and displays, including:
According to the resolution after conversion, according to starting point and the body of a map or chart of each described conversion segment, each described conversion segment is loaded under the described frame of reference in same display interface and displays.
In order to solve above-mentioned technical problem, according to another embodiment of the present invention, it is provided that the device of a kind of network map mix-loaded, including:
Request receiver module, is used for receiving the request of network map mix-loaded, and the request of described network map mix-loaded includes each COS of the positional information of acquisition request, scale and request of loading；
Segment acquisition module, for obtaining, according to each described COS, each pending segment that described positional information is corresponding under described scale from corresponding map server；
Resolution converting block, changes respectively the resolution of each described pending segment for the scale according to each described pending segment, obtains each conversion segment；
Load-on module, displays for each described conversion segment being loaded into same display interface according to the resolution after conversion.
For above-mentioned device, in a kind of possible implementation, resolution converting block is additionally operable to, when also including the frame of reference during described network map mix-loaded is asked, under the described frame of reference, according to the scale of each described pending segment, resolution, picture precision and conversion parameter, the resolution of each described pending segment is changed respectively.
For above-mentioned device, in a kind of possible implementation, resolution converting block is additionally operable to adopt the resolution that following formula 1 calculates each described pending segment to change respectively；
Wherein, Scale is the scale of described pending segment；
Resolution is the resolution of described pending segment；
DPI is the picture precision of described pending segment；
0.0254 is described conversion parameter.
For above-mentioned device, in a kind of possible implementation, the described frame of reference is the earth 2000 coordinate systems or Mercator's coordinate system, and each described COS includes at least two in a day map, ArcGIS, hypergraph map, middle ground map.
For above-mentioned device, in a kind of possible implementation, described load-on module is additionally operable to the resolution after according to conversion, according to starting point and the body of a map or chart of each described conversion segment, is loaded under the described frame of reference in same display interface by each described conversion segment and displays.
Beneficial effect
The embodiment of the present invention can obtain pending segment from the map server of different multiple GIS platform, and the resolution of each pending segment is unified conversion, it is thus possible to the map segment mix-loaded by the multiple GIS platform after conversion displays to same display interface, it is achieved that the compatibility of the network map of multiple GIS platform.
According to below with reference to the accompanying drawings to detailed description of illustrative embodiments, further feature and the aspect of the present invention will be clear from.
Accompanying drawing explanation
The accompanying drawing of the part comprising in the description and constituting description together illustrates the exemplary embodiment of the present invention, feature and aspect with description, and is used for explaining principles of the invention.
Fig. 1 illustrates the flow chart of the method for network map mix-loaded according to an embodiment of the invention；
Fig. 2 is the schematic diagram using the WMTS interface accessing sky map of ArcGIS deviation occur；
Fig. 3 is the part sectional drawing of the WMTS metadata of day map；
Fig. 4 is by the design sketch of ArcGIS Yu the mix-loaded of sky map；
Fig. 5 is the design sketch of the Iserver simultaneously loading sky map, the Arcserver of ArcGIS and middle ground；
Fig. 6 illustrates the structured flowchart of the device of network map mix-loaded according to an embodiment of the invention.
Detailed description of the invention
The various exemplary embodiments of the present invention, feature and aspect is described in detail below with reference to accompanying drawing.Accompanying drawing labelling identical in accompanying drawing represents the same or analogous element of function.Although the various aspects of embodiment shown in the drawings, but unless otherwise indicated, it is not necessary to accompanying drawing drawn to scale.
Word " exemplary " special here means " as example, embodiment or illustrative ".Here should not necessarily be construed as preferred or advantageous over other embodiments as any embodiment illustrated by " exemplary ".
It addition, in order to better illustrate the present invention, detailed description of the invention below gives numerous details.It will be appreciated by those skilled in the art that there is no some detail, the equally possible enforcement of the present invention.In some instances, method, means, element and the circuit known for those skilled in the art are not described in detail, in order to highlight the purport of the present invention.
Current main flow GIS both at home and abroad does not all have the map loading scheme that can simultaneously load a day map, ArcServer, SupermapiServer, middle ground Iserver etc., and the main purpose of the embodiment of the present invention is to solve network map loading method and the device of the compatible WMTS map including above manufacturer and the issue of other GIS platform simultaneously.
Embodiment 1
Fig. 1 illustrates the flow chart of the method for network map mix-loaded according to an embodiment of the invention.As it is shown in figure 1, the method for this network map mix-loaded mainly may include that
Step 101, reception network map mix-loaded request, the request of described network map mix-loaded includes each COS of the positional information of acquisition request, scale and request of loading.
Step 102, from corresponding map server, obtain, according to each described COS, each pending segment that described positional information is corresponding under described scale.
The resolution of each described pending segment is changed by step 103, scale according to each described pending segment respectively, obtains each conversion segment.
Step 104, each described conversion segment is loaded into same display interface displays according to the resolution after conversion.
Specifically, after home server receives the network map mix-loaded request that the user terminals such as such as PC, smart mobile phone, panel computer etc. send, the request of network map mix-loaded can be resolved, therefrom obtain the information such as the positional information of user's request, scale, COS, the frame of reference.Wherein, the frame of reference can be the coordinate system of the earth type such as 2000 coordinate systems, Mercator's coordinate system, and each COS can include at least two in a day map, ArcGIS, hypergraph map, middle ground map.It is only example to the frame of reference and enumerating of COS above, it is also possible to having other coordinate system and COS, this is not limited by the embodiment of the present invention.
Such as, user's request is by scale mix-loaded under the earth 2000 coordinate systems (i.e. national 2000 coordinate systems) with 1:20 ten thousand of Beijing's map of sky map and arcGIS.Positional information is east longitude 115.7 ° 117.4 ° in the request, north latitude 39.4 ° 41.6 ° (i.e. " Beijing "), scale is " 1:20 ten thousand ", and COS is " sky map " and " arcGIS ", and the frame of reference is " the earth 2000 coordinate systems ".
Home server can obtain each pending segment that this positional information is corresponding under this scale from map server corresponding to each COS.Connect example, it is possible to from the server of sky map, obtain the sky map tile (map segment) of 1:20 ten thousand scale of Beijing, from the server of arcGIS, obtain the arcGIS map tile of 1:20 ten thousand scale of Beijing.Obtaining tile in this example from two kinds of map server, can obtain tile in practical application from the map server of three or more types, acquired tile is the pending segment needing subsequent treatment.
In a kind of possible implementation, under the frame of reference, according to the scale of each pending segment, resolution, picture precision and conversion parameter, the resolution of each pending segment is changed respectively.
Specifically, it is possible to adopt the resolution that following formula 1 calculates each described pending segment to change respectively；
Wherein, Scale is the scale of described pending segment；Resolution is the resolution of described pending segment；The picture precision that DPI (DotsPerInch, what per inch printed counts) is described pending segment；0.0254 is described conversion parameter.
Owing to Scale is datum, and the DPI of the map segment of each type is also known, therefore, can calculate the resolution Resolution of the map segment obtaining each COS according to formula 1.
After the resolution of the map segment of each COS being changed according to equation 1 above, can according to the resolution after conversion, according to the parameter such as starting point and body of a map or chart of each described conversion segment, each conversion segment is loaded under the described frame of reference in same display interface and displays.
The method of the network map mix-loaded of the present embodiment, pending segment can be obtained from the map server of different multiple GIS platform, and the resolution of each pending segment is unified conversion, it is thus possible to the map segment mix-loaded by the multiple GIS platform after conversion displays to same display interface, it is achieved that the compatibility of the network map of multiple GIS platform.
Embodiment 2
The embodiment of the present invention solves the scheme of the incompatibility between the WMTS map of the GIS platform issue of each manufacturer, it is possible to adopting software code to realize, development language can select java, C#, php, Python, JavaScript etc..The embodiment of the present invention illustrates the feasibility of the method for Java, although do not write specific code in embodiments of the present invention exactly, but the thought that those skilled in the art are according to embodiments of the present invention also is able to adopt other language to realize.On code realizes, the embodiment of the present invention is based on self-defining code, and uses for reference such as the scheme of increasing income of openlayers etc..
First, the Map Service of Network (WebMapService, WMS) in GIS field, web feature service (WebFeatureService, WFS), network grid service (WebCoverageService are introduced.And the concrete meaning of WMTS WCS).
WMS utilizes the data creating map with geospatial location information.Wherein map is defined as the performance that geodata is visual.This specification defines three operation: GetCapabilities and returns seeervice level metadata, and it is to information on services content and a kind of description requiring parameter；GetMap returns a map image, and its geospatial reference and size parameter are clearly defined；GetFeatureInfo (optional) returns the information of some the special key element being shown on map.
What WMS returned is the map image of figure level, and WFS (servicing also referred to as Web vector) returns is the GML coding of vector level, and provides transaction operations such as the increase of vector, amendment, deletions, be to web map service further deeply.The Web vector service of OGC standard allows client to obtain servicing from multiple Web vectors and uses geographical markup language (GeographyMarkupLanguage, GML) geographical spatial data encoded, five operation: GetCapabilites of this service definition return Web vector service performances and describe document (describing with XML)；DescribeFeatureType returns the XML document describing any vector structure that can provide service；GetFeature provides service for a request obtaining vector example；Transaction provides service for transactions requests；LockFeature processes the request during affairs, one or more vector type examples locked.
WCS space-oriented image data, it using comprise geographical position value geographical spatial data as " grid (Coverage) " in online phase interchangeable.WCS is made up of three kinds of operations: GetCapabilities, GetCoverage and DescribeCoverageType.GetCapabilities operation returns the XML document of the service of description and data set.At GetCapabilities, GetCoverage operation in WCS determines that inquiry can perform, which type of data can obtain and perform afterwards for which type of, it uses general grid format to return value or the attribute in geographical position.DescribeCoverageType operation allows client request being fully described by arbitrary cover layer of concrete WCS server offer.
WMTS standard defines certain operations, and these operations allow user to access slice map.WMTS provides a kind of standardized solution adopting predefined figure block method to issue numerical map service.WMTS compensate for WMS and is not provided that the deficiency of piecemeal map.WMS, for the service providing customizable maps, is a dynamic data or the user desirable solution that customizes map (needing join style figure layer describer (StyledLayerDescriptor, SLD) standard).WMTS sacrifices the motility providing customization map, and instead by providing static data (basic map) to strengthen retractility, the scope frame of these static datas and scale are limited in each segment.These fixing segment collection make the realization of WMTS service can be used a Web server only simply returning existing file, allow to utilize the network mechanism of the such as distributed caching of some standards to realize retractility simultaneously.
The embodiment of the present invention is based primarily upon WMTS service and obtains pending segment from various GIS platform, acquired pending segment is carried out the unified conversion of resolution, then by the segment mix-loaded after conversion.Except the map mix-loaded that the WMTS of different platform is serviced, it is also possible to the map mix-loaded that the map serviced of the WMTS after conversion resolution is serviced with WMS, WFS, WCS etc..
The feature of the map server of the different GIS platform such as a day map, ArcGISServer, middle ground IServer, SupermapiServer is described below.
" sky map " is the Research on Geographical Information Generalization site for service that mapping geography information office of country builds.It is the important component part of " Digital CHINA ", is public's version of national geographic information public service platform.The purpose of " sky map " is in that promote geographic information resources to share and efficiently utilize, improve mapping geography information ability of public service and level, improving the method for service of mapping geography information achievement, meet the needs that national information is built better, work and life for the public provide convenient.
ArcGISServer is a platform for building centralized management, support the enterprise GIS of multi-user to apply.ArcGISServer provides abundant GIS function, for instance map, localizer and the software object being used in central server application.
Middle ground Iserver is researched and developed a GIS server software by Wuhan Zondy Cyber Co., Ltd., it is provided that the GIS online service of various modes.
SuperMapiServer8C is based on the cloud GIS application server of high-performance GIS kernel, it is divided into standard edition, professional version, three versions of senior version at present, the service with two three-dimensional integratedization is issued, is managed and polymerizable functional, and multi-level regarded as output controlling ability is provided, by providing the exploitation SDK (SoftwareDevelopmentKit such as multiple mobile terminal, Web end, PC end, SDK), can be used for building Enterprise SOA (Service-OrientedArchitecture, SOA) application system and the proprietary cloud system of GIS.
Then, the map mix-loaded of world Fig. 2 .0 Yu ArcGIS platform is exemplarily illustrated by the present embodiment.
The basic condition of world Fig. 2 .0 is as follows:
1) based on the WMTS1.0.0 version of OGC；
2) map vector, photomap and topography are provided；
3) two kinds of coordinate systems are provided: national 2000 earth coordinates and WebMercator projected coordinate system (i.e. Mercator's coordinate system)；
4) map and labeled data are separately, and map vector and photomap provide Chinese and English mark, and topography only provides Chinese mark.
In the embodiment of the present invention, pass through the map server of WMTS each GIS platform of interface accessing at home server.Wherein, ArcGIS product, both provide the support to WMTS including Desktop Product, WebAPIs, NativeSDKs, Supermap, middle service similar with ArcGIS product.For ArcGIS in the embodiment of the present invention, it is possible to accessed the WMTS service of world figure by these interfaces.But practical situation is more complex, find through test, use the WMTS interface accessing sky map of ArcGIS, it may appear that deviation, be illustrated in fig. 2 shown below.Finding through research, the basic reason producing deviation is in that: the DPI that the DPI used in ArcGISWMTS interface uses with sky map is inconsistent.
OGCWMTS standard specifies, the metadata of WMTS can be obtained by getcapatilities request.Fig. 3 is the part sectional drawing (XML format) of world Fig. 2 .0WMTS metadata.Metadata comprises the scale number of each rank according to (such as the content as shown in Fig. 3 center).When accessing WMTS, it is necessary to adopt formula 1 by these metadata Calculate resolution.
In OGCWMTS specification, DPI adopts 90.71 (namely adopting 0.028mm as the physical width of a pixel), and the DPI that sky map uses adopts 96 (see " electronic chart specifications ") of national Specification.Owing to ArcGISWMTS interface realizes all following OGCWMTS standard, using 90.71 to carry out calculating resolution as DPI, cause when ArcGIS passes through WMTS interface accessing sky map, picture physical size becomes big so that map looks and offsets to the right.
According to above-mentioned analysis, ArcGISWMTS interface accessing sky map is adopted to produce the main cause of skew during due to DPI difference, it is possible to targetedly ArcGIS interface to be extended, realize the access to sky map.
Specifically, ArcGIS interface can extend.For ArcGISRuntimeSDKforAndroid, it is provided that TiledServiceLayer class.This is the foundation class accessing section service, by extending this class, it is possible to access the WMTS service of sky map.Before extension, it is to be understood that some parameters of sky Map Services once, including:
(1) scale
Under two kinds of coordinate systems (Mercator's coordinate system and national 2000 coordinate systems), the scale of sky map is consistent, and for 18 grades of scales, the concrete numerical value of each scale is as follows.
Privatestaticfinaldouble [] SCALES={2.958293554545656E8, 1.479146777272828E8, 7.39573388636414E7, 3.69786694318207E7, 1.848933471591035E7, 9244667.357955175, 4622333.678977588, 2311166.839488794, 1155583.419744397, 577791.7098721985, 288895.85493609926, 144447.92746804963, 72223.96373402482, 36111.98186701241, 18055.990933506204, 9027.995466753102, 4513.997733376551, 2256.998866688275}；
(2) resolution
Under two kinds of coordinate systems, the resolution of sky map is different.Wherein, the resolution under Mercator's coordinate system is as follows:
Privatestaticfinaldouble [] RESOLUTIONS_MERCATOR={78271.51696402048, 39135.75848201024, 19567.87924100512, 9783.93962050256, 4891.96981025128, 2445.98490512564, 1222.99245256282, 611.49622628141, 305.748113140705, 152.8740565703525, 76.43702828517625, 38.21851414258813, 19.109257071294063, 9.554628535647032, 4.777314267823516, 2.388657133911758, 1.194328566955879, 0.5971642834779395}；
Resolution under national 2000 coordinate systems is as follows:
Privatestaticfinaldouble [] RESOLUTIONS_2000={0.7031249999891485, 0.35156249999999994, 0.17578124999999997, 0.08789062500000014, 0.04394531250000007, 0.021972656250000007, 0.01098632812500002, 0.00549316406250001, 0.0027465820312500017, 0.0013732910156250009, 0.000686645507812499, 0.0003433227539062495, 0.00017166137695312503, 0.00008583068847656251, 0.000042915344238281406, 0.000021457672119140645, 0.000010728836059570307, 0.000005364418029785169}；
(3) starting point
Starting point under national 2000 coordinate systems is as follows:
PrivatestaticfinalPointORIGIN_2000=newPoint (-180,90)；
Starting point under Mercator's coordinate system is as follows:
PrivatestaticfinalPointORIGIN_MERCATOR=newPoint (-20037508.3427892,20037508.3427892)；
(4) body of a map or chart
Body of a map or chart under national 2000 coordinate systems is as follows:
PrivatestaticfinaldoubleX_MIN_2000=-180；
PrivatestaticfinaldoubleY_MIN_2000=-90；
PrivatestaticfinaldoubleX_MAX_2000=180；
PrivatestaticfinaldoubleY_MAX_2000=90；
Body of a map or chart under Mercator's coordinate system is as follows:
PrivatestaticfinaldoubleX_MIN_MERCATOR=-20037508.3427892；
PrivatestaticfinaldoubleY_MIN_MERCATOR=-20037508.3427892；
PrivatestaticfinaldoubleX_MAX_MERCATOR=20037508.3427892；
PrivatestaticfinaldoubleY_MAX_MERCATOR=20037508.3427892；
Wherein, according to information such as the above-mentioned scale of sky map, resolution, starting point and body of a map or charts, extend TiledServiceLayer, realize by equation 1 above, the resolution of the tile of sky map being changed, to realize accessing sky map by ArcGIS, core code is as follows:
Finally, the TianDiTuLayer after adopting code below can use extension shows a day Map Services.
MapMercator=(MapView) this.findViewById (R.id.mapMercator)；
LayermapLayer
=newTianDiTuLayer (TianDiTuLayerTypes.TIANDITU_VECTOR_MERCATOR)；
This.mapMercator.addLayer (mapLayer)；
LayerannotationLayer=newTianDiTuLayer (
TianDiTuLayerTypes.TIANDITU_VECTOR_ANNOTATION_CHINESE_ME RCATOR)；
This.mapMercator.addLayer (annotationLayer)；
The TianDiTuLayer after extension is used to load sky map, the business datum of ArcGIS with sky map can be superposed, the mix-loaded effect realized after superposition is as shown in Figure 4, in figure, white base map is a day map, and the map of China of Lycoperdon polymorphum Vitt (actual screen can show colour such as purple) is ArcGIS.Fig. 5 is the design sketch of the Iserver simultaneously loading sky map, the Arcserver of ArcGIS and middle ground, it is possible to demonstrate the map of China of the multiple color of mix-loaded.
The embodiment of the present invention can break through the incompatible difficult problem caused between different vendor due to the difference of Map Services type, it is achieved that loads the gradient map services such as sky map in multiple GIS platform.Increasing ID website now, domestic government data website discloses substantial amounts of geodata service, realizing on the basis that multiple Map Services loads, loading and the displaying of multi-source Spatial Data service can be realized well, for the solution of scientific research, sector application offer technical feasibility.
Embodiment 3
Fig. 6 illustrates the structured flowchart of the device of network map mix-loaded according to an embodiment of the invention.As shown in Figure 6, the device of this network map mix-loaded mainly may include that
Request receiver module 61, is used for receiving the request of network map mix-loaded, and the request of described network map mix-loaded includes each COS of the positional information of acquisition request, scale and request of loading；
Segment acquisition module 63, is connected with request receiver module 61, for obtaining, according to each described COS, each pending segment that described positional information is corresponding under described scale from corresponding map server；
Resolution converting block 65, is connected with segment acquisition module 63, for the scale according to each described pending segment, the resolution of each described pending segment is changed respectively, obtains each conversion segment；
Load-on module 67, is connected with resolution converting block 65, displays for each described conversion segment being loaded into same display interface according to the resolution after conversion.
In a kind of possible implementation, resolution converting block 65 is additionally operable to, when also including the frame of reference during described network map mix-loaded is asked, under the described frame of reference, according to the scale of each described pending segment, resolution, picture precision and conversion parameter, the resolution of each described pending segment is changed respectively.
In a kind of possible implementation, resolution converting block 65 is additionally operable to adopt the resolution that following formula 1 calculates each described pending segment to change respectively；
Wherein, Scale is the scale of described pending segment；
Resolution is the resolution of described pending segment；
DPI is the picture precision of described pending segment；
0.0254 is described conversion parameter.
In a kind of possible implementation, the described frame of reference is the earth 2000 coordinate systems or Mercator's coordinate system, and each described COS includes at least two in a day map, ArcGIS, hypergraph map, middle ground map.
In a kind of possible implementation, described load-on module 67 is additionally operable to the resolution after according to conversion, according to starting point and the body of a map or chart of each described conversion segment, each described conversion segment is loaded under the described frame of reference in same display interface and displays.
Specifically, the method for the network map mix-loaded that each module of the device of the network map mix-loaded of the present embodiment is able to carry out in above-described embodiment, concrete principle and example may refer to the associated description of the method for network map mix-loaded.
The device of the network map mix-loaded of the present embodiment, pending segment can be obtained from the map server of different multiple GIS platform, and the resolution of each pending segment is unified conversion, it is thus possible to the map segment mix-loaded by the multiple GIS platform after conversion displays to same display interface, it is achieved that the compatibility of the network map of multiple GIS platform.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (10)
1. the method for a network map mix-loaded, it is characterised in that including:
Receiving the request of network map mix-loaded, the request of described network map mix-loaded includes each COS of the positional information of acquisition request, scale and request of loading；
From corresponding map server, each pending segment that described positional information is corresponding under described scale is obtained according to each described COS；
The resolution of each described pending segment is changed by scale according to each described pending segment respectively, obtains each conversion segment；
According to the resolution after conversion, each described conversion segment is loaded into same display interface to display.
2. method according to claim 1, it is characterized in that, the request of described network map mix-loaded also includes the frame of reference, from corresponding map server, obtains, according to each described COS, each pending segment that described positional information is corresponding under described scale, including:
Under the described frame of reference, according to the scale of each described pending segment, resolution, picture precision and conversion parameter, the resolution of each described pending segment is changed respectively.
3. method according to claim 2, it is characterised in that under the described frame of reference, according to the scale of each described pending segment, resolution, picture precision and conversion parameter, changes respectively to the resolution of each described pending segment, including:
The resolution that following formula 1 calculates each described pending segment is adopted to change respectively；
Wherein, Scale is the scale of described pending segment；
Resolution is the resolution of described pending segment；
DPI is the picture precision of described pending segment；
0.0254 is described conversion parameter.
4. method according to claim 3, it is characterised in that the described frame of reference is the earth 2000 coordinate systems or Mercator's coordinate system, and each described COS includes at least two in a day map, ArcGIS, hypergraph map, middle ground map.
5. the method according to any one of claim 2 to 4, it is characterised in that according to the resolution after conversion, each described conversion segment is loaded into same display interface and displays, including:
According to the resolution after conversion, according to starting point and the body of a map or chart of each described conversion segment, each described conversion segment is loaded under the described frame of reference in same display interface and displays.
6. the device of a network map mix-loaded, it is characterised in that including:
Request receiver module, is used for receiving the request of network map mix-loaded, and the request of described network map mix-loaded includes each COS of the positional information of acquisition request, scale and request of loading；
Segment acquisition module, for obtaining, according to each described COS, each pending segment that described positional information is corresponding under described scale from corresponding map server；
Resolution converting block, changes respectively the resolution of each described pending segment for the scale according to each described pending segment, obtains each conversion segment；
Load-on module, displays for each described conversion segment being loaded into same display interface according to the resolution after conversion.
7. device according to claim 6, it is characterized in that, resolution converting block is additionally operable to, when also including the frame of reference during described network map mix-loaded is asked, under the described frame of reference, according to the scale of each described pending segment, resolution, picture precision and conversion parameter, the resolution of each described pending segment is changed respectively.
8. device according to claim 7, it is characterised in that resolution converting block is additionally operable to adopt the resolution that following formula 1 calculates each described pending segment to change respectively；
Wherein, Scale is the scale of described pending segment；
Resolution is the resolution of described pending segment；
DPI is the picture precision of described pending segment；
0.0254 is described conversion parameter.
9. device according to claim 8, it is characterised in that the described frame of reference is the earth 2000 coordinate systems or Mercator's coordinate system, and each described COS includes at least two in a day map, ArcGIS, hypergraph map, middle ground map.
10. the device according to any one of claim 7 to 9, it is characterized in that, described load-on module is additionally operable to the resolution after according to conversion, according to starting point and the body of a map or chart of each described conversion segment, each described conversion segment is loaded under the described frame of reference in same display interface and displays.
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