CN105516311A - Electronic map panorama acquisition method and system - Google Patents
Electronic map panorama acquisition method and system Download PDFInfo
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- CN105516311A CN105516311A CN201510902692.3A CN201510902692A CN105516311A CN 105516311 A CN105516311 A CN 105516311A CN 201510902692 A CN201510902692 A CN 201510902692A CN 105516311 A CN105516311 A CN 105516311A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/52—Network services specially adapted for the location of the user terminal
Abstract
The invention discloses an electronic map panorama acquisition method. The method is applied to an electronic map panorama acquisition system comprising a client and a server. The method comprises the following steps that: the client acquires a screenshot area selected by a user in an electronic map display range, and acquires a resolution of the screenshot area input by the user; the client transmits the resolution and map data of a vector form in the screenshot area read from a client side to the server; the server determines a map hierarchy corresponding to the resolution, and splices a base map belonging to the map hierarchy in the screenshot area; the server draws map information on the base map according to the map data; and the server transmits an address of a drawn screenshot to the client in order that the client downloads the drawn screenshot according to the screenshot address.
Description
Technical field
The present invention relates to electronic map technique field, particularly relate to a kind of electronic chart panorama sketch acquisition methods and system.
Background technology
Electronic chart and numerical map utilize computer technology, the map storing in a digital manner and consult.Electronic chart is stored on the hard disk of computer, floppy disk, the medium such as CD or tape, and map content is represented by numeral, needs to be shown these numerals by special computer software, reads, retrieves, analysis etc.Electronic chart stores the method for information, general use vector mode image storage, map scale is enlarging or reducing or rotate and do not affect display effect, early application bit map type stores, map scale can not zoom in or out, hyundai electronics map software general GIS-Geographic Information System stores and transmits map datum, also has other information system.The amount of information that electronic chart can represent is far longer than general map, draws represent position as highway on general map with line, and the distinct symbols such as shape, width, color of line represents grade and other information of highway.Electronic chart can also be combined with other information sources such as satellite image, aerial photograph easily, generates new figure kind.
In electronic chart application, screenshot capture is a kind of conventional function, it can download the image of current screen scope, user's off-line is facilitated to check, but the screenshot capture function of electronic chart is different from the sectional drawing mode of other software, because the base map information on map, POI (PointofInterest, point-of-interest) information, draw out after traffic route information etc. is all searched in real time by server, user is when pulling map, these information also can real-time update, real-time loading, recalculate rear generation, so, user cannot obtain the sectional drawing outside screen ranges in theory.
The screenshot capture function of existing map web site, as Baidu's map, high moral map etc., it is all the image of being caught current screen by system programming interface, then through cutting, obtain current screen sectional drawing, if go for the more high-resolution sectional drawing in certain body of a map or chart, can only be obtained by the method for artificial repeatedly screenshot capture and then splicing.Visible, the image that existing screenshot capture function intercepts can be subject to the restriction of monitor resolution, user cannot obtain the image exceeding present displays resolution, namely sectional drawing can not be carried out to the image exceeding screen resolution requirement, and by manually splicing, the method obtaining more high-definition picture wastes time and energy, cost is high, and can produce error.
Summary of the invention
In view of this, the main purpose of the embodiment of the present invention is to provide a kind of electronic chart panorama sketch acquisition methods and system, to realize the object of the electronic chart downloading arbitrary resolution.
For achieving the above object, for embodiments providing a kind of electronic chart panorama sketch acquisition methods, described method is applied to a kind of electronic chart panorama sketch comprising client and server and obtains system, and described method comprises:
Described client obtains the screenshot area that user chooses in electronic chart indication range, and obtains the resolution to described screenshot area of user's input;
The map datum of the vector form in described resolution and the described screenshot area that reads from described client-side is sent to described server by described client;
Described server determines the map level that described resolution is corresponding, and splices the map base map in the described screenshot area that to belong in described map level;
Described server is according to described map datum map making information on described map base map;
Drawn sectional drawing image address is sent to described client by described server, so that described client downloads drawn sectional drawing image according to described sectional drawing image address.
Optionally, the screenshot area that described acquisition user chooses in electronic chart indication range, comprising:
The screenshot area that the screenshot box that acquisition user utilizes described client to show is selected at electronic chart indication range inside casing;
Or, obtain user and choose by touch screen the screenshot area that mode selects at electronic chart indication range inner ring;
Or described area item is also sent to described server by the area item that acquisition user selects from predeterminable area option, and described server side saves the profile information of predeterminable area in electronic chart; Obtain the profile information of predeterminable area corresponding to described area item that described server returns, using the profile information that obtains as the screenshot area to shown electronic chart.
Optionally, the map datum of the vector form in the described screenshot area read from described client-side is sent to described server by described client, comprising:
Described map datum is converted to Json form by described client, and by Post request method, the map datum of described Json form is sent to described server;
In described client by after being sent to described server from the map datum in the described screenshot area that described server side reads, also comprise:
The map datum of Json form described in described server parses, and utilize the map datum after predefined JavaBean storing and resolving.
Optionally, described client also comprises while the map datum in described resolution and described screenshot area is sent to described server:
Screen coordinate corresponding for the map display area corner of described client-side is sent to described server;
The described map base map spliced in the described screenshot area that to belong in described map level, comprising:
In the map level determined, screen coordinate corresponding for the map display area corner of described client-side is converted to Mercator's coordinate;
Be tile coordinate by described Mercator's Coordinate Conversion;
According to described tile coordinate, obtain all map tile in described map display area, and utilize described all map tile to be spliced into electronic chart base map in described map display area;
From the electronic chart base map in described map display area, intercept the electronic chart base map in described screenshot area.
Optionally, described client is sent to the map datum of described server for Mercator's coordinate data, and described server, according to described map datum map making information on described map base map, comprising:
Described Mercator's coordinate data is converted to image coordinate data by described server, according to described image coordinate data map making information on described map base map.
Optionally, described map datum comprises: user annotation information and the map datum be stored in described server side database.
The embodiment of the present invention additionally provides a kind of electronic chart panorama sketch and obtains system, and described system comprises client and server:
Described client, for obtaining the screenshot area that user chooses in electronic chart indication range, and obtain the resolution to described screenshot area of user's input, the map datum of the vector form in described resolution and the described screenshot area that reads from described client-side is sent to described server;
Described server, for determining the map level that described resolution is corresponding, and the map base map spliced in the described screenshot area that to belong in described map level, according to described map datum map making information on described map base map, drawn sectional drawing image address is sent to described client, so that described client downloads drawn sectional drawing image according to described sectional drawing image address.
Optionally, described client has the screenshot area chosen in electronic chart indication range for obtaining user in the following manner:
The screenshot area that the screenshot box that acquisition user utilizes described client to show is selected at electronic chart indication range inside casing;
Or, obtain user and choose by touch screen the screenshot area that mode selects at electronic chart indication range inner ring;
Or described area item is also sent to described server by the area item that acquisition user selects from predeterminable area option, and described server side saves the profile information of predeterminable area in electronic chart; Obtain the profile information of predeterminable area corresponding to described area item that described server returns, using the profile information that obtains as the screenshot area to shown electronic chart.
Optionally, described client has in the following manner the map datum of the vector form in the described screenshot area read from described client-side being sent to described server:
Described map datum is converted to Json form by described client, and by Post request method, the map datum of described Json form is sent to described server;
Described server, also for resolving the map datum of described Json form, and utilizes the map datum after predefined JavaBean storing and resolving.
Optionally, described client, also for while the map datum in described resolution and described screenshot area is sent to described server, is sent to described server by screen coordinate corresponding for the map display area corner of described client-side;
Described client has the map base map for splicing in the following manner in the described screenshot area to belong in described map level:
In the map level determined, screen coordinate corresponding for the map display area corner of described client-side is converted to Mercator's coordinate;
Be tile coordinate by described Mercator's Coordinate Conversion;
According to described tile coordinate, obtain all map tile in described map display area, and utilize described all map tile to be spliced into electronic chart base map in described map display area;
From the electronic chart base map in described map display area, intercept the electronic chart base map in described screenshot area.
Optionally, described client is sent to the map datum of described server for Mercator's coordinate data, and described server has for drawing described cartographic information in the following manner:
Described Mercator's coordinate data is converted to image coordinate data by described server, according to described image coordinate data map making information on described map base map.
Optionally, described map datum comprises: user annotation information and the map datum be stored in described server side database.
The electronic chart panorama sketch acquisition methods that the embodiment of the present invention provides and system, client obtains the screenshot area that user chooses in electronic chart indication range, and obtain the resolution to described screenshot area of user's input, the map level that described resolution is corresponding, server splices the map base map in the described screenshot area that to belong in this map level and the cartographic information on map base map, and the address of drawing image is sent to client so that client downloads image.Visible, the resolution that the embodiment of the present invention is arranged according to user, the panorama sketch that can realize arbitrary resolution is downloaded, have nothing to do with the resolution of screen itself, be no matter computer, mobile phone, flat board can downloading high definition panorama sketch, in addition, panorama sketch downloading process is automatically spliced, faster than Prof. Du Yucang speed, efficiency is high, saving cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the configuration diagram that embodiment of the present invention electronic chart panorama sketch obtains system;
Fig. 2 is the schematic flow sheet of embodiment of the present invention electronic chart panorama sketch acquisition methods;
Fig. 3 is area, embodiment of the present invention Beijing work, agriculture, in, build the site thumbnail of Big Four (Barclay Bank, Lloyd's Bank, Midland Bank, National Westinster Bank);
Fig. 4 is the panorama sketch of embodiment of the present invention electronic chart screenshot area;
Fig. 5 is embodiment of the present invention Beijing subbranch of Taobao site schematic diagram;
Fig. 6 is embodiment of the present invention Coordinate Conversion schematic diagram;
Fig. 7 is embodiment of the present invention latitude and longitude coordinates system schematic diagram;
Fig. 8 is embodiment of the present invention Mercator coordinate system schematic diagram;
Fig. 9 is embodiment of the present invention tile coordinate system schematic diagram;
Figure 10 is the composition schematic diagram that embodiment of the present invention electronic chart panorama sketch obtains system.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention is by a series of Coordinate Conversion, user is wanted the graphical information such as geospatial coordinates, map label information, User Defined markup information of sectional drawing, redraw algorithm and stitching algorithm superposition again by server, form the complete map panorama sketch within the scope of this sectional drawing.The embodiment of the present invention supports that user downloads arbitrary resolution and comprises the map panorama sketch of any spatial dimension of any user annotation information, no matter is computer, the equipment such as mobile phone, flat board all can download, be not subject to the restriction of screen size.
See Fig. 1, for the configuration diagram of the electronic chart panorama sketch acquisition system that the embodiment of the present invention provides, system that employs three-tier architecture, be respectively presentation layer (UI), Business Logic (BLL) and data access layer (DAL).Presentation layer adopts Flex language, is responsible for carrying out service data interaction with user, and calculate the current sectional drawing parameter of user and represent final result, its function is realized by the browser of client-side; Business Logic have employed Java language and realizes, be responsible for calculating the input information of user, redraw, finally generating panorama sketch, need from data access layer data query in computational process, calculate after terminating and result is passed back presentation layer display, its function is realized by server; Data access layer have employed sybase database, stores the geography information of each POI, provides the data access support to Business Logic.
Described electronic chart panorama sketch obtains system and is divided into front-end and back-end two parts, and front end is responsible for user operation, reading map datum, packing parameter, is sent parameter, and receiving parameter is responsible in rear end, coordinate calculates, splices base map, redraws map etc.Be specifically introduced with regard to the embodiment of the present invention below.
See Fig. 2, be the schematic flow sheet of the electronic chart panorama sketch acquisition methods that the embodiment of the present invention provides, the method is applied to the electronic chart panorama sketch comprising client and server and obtains system, and the method comprises:
Step 201: described client obtains the screenshot area that user chooses in electronic chart indication range, and obtain the resolution to described screenshot area of user's input.
In step 201, major function is user interactions, comprises map basic operation (translation, convergent-divergent), chooses sectional drawing scope, selects resolution, downloads.
In embodiments of the present invention, after user opens electronic chart interactive interface by the browser of client-side, user can choose screenshot area in electronic chart indication range, if user wants the map area intercepted in a big way, the electronic chart ratio that screen shows can be reduced, if user wants to intercept other map area, map can be carried out translation, then in current map indication range, choose screenshot area.Such as, area, Beijing work shown in Figure 3, agriculture, in, build the site thumbnail of Big Four (Barclay Bank, Lloyd's Bank, Midland Bank, National Westinster Bank), suppose that user wants to obtain the detailed map of region, Big Four (Barclay Bank, Lloyd's Bank, Midland Bank, National Westinster Bank) site within the scope of Beijing, first, by showing the site thumbnail of Big Four (Barclay Bank, Lloyd's Bank, Midland Bank, National Westinster Bank) of Beijing after search on interactive interface, then, user chooses Beijing's scope as screenshot area on breviary map, and the multiplication factor (i.e. resolution) that have selected screenshot area, such as 6 times, so that through the calculating of server with after redrawing, generate the high definition image in different resolution within the scope of this screenshot area and return to client, after redrawing through server calculating, user finally obtains the panorama sketch of electronic chart screenshot area as shown in Figure 4, wherein, figure above Fig. 4 is drawn screenshot area panorama sketch, figure below Fig. 4 is that in screenshot area, regional area is exaggerated the image after 6 times.
Client obtains the mode of screenshot area, includes but not limited to following three kinds:
Mode one: obtain the screenshot box that user utilizes described client to show, in the screenshot area of electronic chart indication range inside casing choosing.
In electronic chart interactive interface, if there is the screenshot box that frame selects function to provide, then this screenshot box can be directly utilized to select screenshot area at the electronic chart upper ledge of display.
Mode two: obtain user and choose by touch screen the screenshot area that mode selects at electronic chart indication range inner ring.
The equipment such as existing smart mobile phone all support contact action, in electronic chart interactive interface, if support that touch screen circle selects function, user just selects screenshot area by contact action circle, the shape that user encloses choosing can be the arbitrary shapes such as circle, rectangle, polygon, and size does not limit.
Described area item is also sent to described server by the area item that mode three, acquisition user select from predeterminable area option, and described server side saves the profile information of predeterminable area in electronic chart; Obtain the profile information of predeterminable area corresponding to described area item that described server returns, using the profile information that obtains as the screenshot area to shown electronic chart.
Server side additionally can preserve the profile information of predeterminable area, such as preserve the profile information of the predeterminable areas such as Chinese all provinces, city, county, district, user can direct selected zone item from the region option interactive interface, the area item that user selects can be sent to server by client, and the profile information of predeterminable area corresponding for this area item is then returned to client as screenshot area by server.
In embodiments of the present invention, in order to obtain the sectional drawing image higher than current display map resolution, the image namely after screenshot area amplification, then user can select resolution by selecting multiplication factor.See Fig. 2, user is when carrying out " panorama sketch download ", multiplication factor is selected in display box, again by clicking " determination " Option Box, user end to server is made to send download request, now client can perform step 202, or by clicking " cancellation " Option Box, client just can not perform step 202.
Step 202: the map datum of the vector form in described resolution and the described screenshot area that reads from described client-side is sent to described server by described client.
In step 202., major function reads and describes map datum, reading and describing map datum is a most important step in front-end algorithm, and the key of this step is all kinds of map datums in screenshot area with the formal description of vector out, then sends back-end server to the form of style.On the whole, map datum may be summarized to be point, line, surface three major types, can be divided into geography information and the large class of style information two to the description of these data.
1., point
Point data is commonly used to represent POI (pointofinterest, point-of-interest), as site, subbranch, dining room, post office etc., the geography information of point comprises point coordinates, style information comprises the URL (UniformResourceLocator of icon, URL(uniform resource locator)), side-play amount (side-play amount between the true coordinate namely put and coordinates of icon), size, transparency, the word of label, background, size, color, font, side-play amount (side-play amount between the true coordinate namely put and tag coordinate) etc., Beijing subbranch of Taobao site schematic diagram as shown in Figure 5, wherein, icon is " newly " in figure, label is " Beijing subbranch of Taobao " in figure.
The description of point can represent (code sample) as follows:
2., line
Line data are commonly used to represent route information, its geography information forms (if there is straight line by series of points, then cartographic information comprises the point coordinates at line two ends, if there is curve, then cartographic information also comprises the sample point coordinate on curve), style information comprises the thickness, color, line style, transparency etc. of line.
The description of line can represent (code sample) as follows:
3., face
Face data are commonly used to represent administrative division, self-defined section, space querying region etc., its geography information is made up of (namely geography information comprises the sample point coordinate on polygonal wheel profile) multiple polygon, and style information comprises the color, thickness, Fill Color, transparency etc. of profile.
The description in face can represent (code sample) as follows:
Above-mentioned map datum is converted to Json form by client, namely all geography information are packed by Front End by client together with style information, and packing data is converted to Json (JavaScriptObjectNotation) form, and by Post request (Post request is the one in HTTP request mode) mode, the map datum of described Json form is sent to described server.
Back-end server provides an algorithm service interface in the mode of WebService (Web service), and according to the parameter splicing drawing image that client is imported into, result returns to client user interface the most at last, for user provides download.In order to receive the data that client sends, a set of data structure importing data match with client into must be defined in back-end server side, therefore, for all point, line, surface isovector information that client sends, in back-end algorithm, all must redefine the JavaBean (JavaBean is the Reusable Module that a kind of JAVA language is write as) matched store the Vector Message etc. unpacking rear data.Back-end server refer to third-party library file fastJson (Fastjson is the JSON storehouse that performance function that a Java language is write is perfect), be resolve the fastest third party library of Json at present, fast the Json character string received from client can be reduced into vector data and JavaBean by this file.Visible, described server, after the map datum receiving the Json form that client sends, by resolving the map datum of described Json form, and utilizes the map datum after predefined JavaBean storing and resolving.
Step 203: described server determines the map level that described resolution is corresponding, and splice the map base map in the described screenshot area that to belong in described map level.
In step 203, the map level that different resolution is corresponding different, differently the cartographic information of the corresponding different level of detail of figure level, for the sectional drawing image of server maps, should be the image determined in level.The sectional drawing image of server maps comprises the base map in screenshot area and comprises the cartographic information of point, line, surface etc.When splicing base map and map making information, needing to carry out a series of Coordinate Conversion, specifically needing the mutual conversion of using five kinds of coordinate systems, being respectively latitude and longitude coordinates system, Mercator's coordinate system, screen coordinate system, tile coordinate system, image coordinate system.These five kinds of coordinate systems have specific use occasion separately, among them using Mercator's coordinate system as core coordinate system, and can mutually change between other four kinds of coordinate systems, Coordinate Conversion schematic diagram shown in Figure 6, describes in detail to each coordinate system below.
1, latitude and longitude coordinates system
Latitude and longitude coordinates system schematic diagram shown in Figure 7, latitude and longitude coordinates system is also called " geographic coordinate system ", belongs to spherical coordinate, and its codomain scope is: x ∈ (-180,180), y ∈ [-90,90], unit for degree, to the east of be x positive direction, north is y positive direction.In a database, all map vector datas all store with longitude and latitude form, and as site coordinate, administrative division border etc., latitude and longitude coordinates is the true coordinate of data.
2, Mercator's coordinate system
Mercator's coordinate system schematic diagram shown in Figure 8, Mercator's coordinate system is also known as " Mercator projection coordinate " or " isogonism positive axis conic projection coordinate ", and it is drafted by Dutch map scholar Mercator.Mercator's coordinate system derives from latitude and longitude coordinates system, assuming that the earth is enclosed in a cylinder, equator and cylinder tangent, then imagination has a lamp at earth center place, earth surface is projected on periphery, cylinder is launched, what obtain is exactly world map under Mercator's coordinate system again.Notice when drop shadow spread is close to north and south poles, projection result can be tending towards infinitely great, so Mercator's coordinate system void value within south poles about 15 degree, the longitude and latitude scope that namely complete Mercator's world map is corresponding is:
x～(-180,180),y～[-85,85]
Mercator's coordinate is with the intersection point in the first meridian and equator for initial point, and east is x positive direction, and north is y positive direction, and all vector graphics and the displaying of base map tile on map all use this coordinate system.
Conversion regime between latitude and longitude coordinates and Mercator's coordinate is as follows.
Because equatorial radius is 6378137 meters, then equal equatorial perimeter by the x-axis scope of the known Mercator's coordinate of above-mentioned definition, i.e. 2*PI*r=2*20037508.3427892, therefore x ∈ [-20037508.3427892,20037508.3427892], become a square to make map to be convenient to calculate, the y-axis scope of Mercator's coordinate is also defined as y ∈ [-20037508.3427892,20037508.3427892].
Based on above-mentioned definition, the pass of latitude and longitude coordinates and Mercator's coordinate is:
Mercator.x＝lonlat.x*20037508.3427892/180
Mercator.y＝log(tan((lonlat.y+90)*PI/360))/(PI/180)
Wherein, Mercator.x represents the Mercator's coordinate in X-direction, and Mercator.y represents the Mercator's coordinate in Y direction, and lonlat.x represents the latitude and longitude coordinates in X-direction, and lonlat.y represents the latitude and longitude coordinates in Y direction, and PI represents π.
Formula also instead can be extrapolated and be converted to Mercator by latitude and longitude coordinates and sit calibration method thus.
3, screen coordinate system
Screen coordinate belongs to plane coordinates, and unit is pixel, and with the screen upper left corner for initial point, the right side is x positive direction, and lower is y positive direction.The all front-end operations of user all uses this coordinate system.
Conversion regime between screen coordinate and Mercator's coordinate is as follows.
Suppose that the body of a map or chart of active user's screen is for [xmin, ymin, xmax, ymax], be Mercator's coordinate, then on screen, the coordinate of any point can be obtained by following formula:
Screen.x＝(Mercator.x－xmin)/(xmax－xmin)*ScreenWidth
Screen.y＝(ymax－Mercator.y)/(ymax－ymin)*ScreenHeight
Wherein, Mercator.x represents the Mercator's coordinate in X-direction, and Mercator.y represents the Mercator's coordinate in Y direction, and Screen.x represents the screen coordinate in X-direction, and Screen.y represents the screen coordinate in Y direction.
4, tile coordinate system
Tile coordinate system schematic diagram shown in Figure 9, tile coordinate belongs to plane coordinates, without unit, with the intersection point of the first meridian and Mercator's coordinate y-axis minimum value for initial point, east is x positive direction, and south is y positive direction, increase progressively successively, each index value represents a tile.When GIS (GeographicInformationSystem, GIS-Geographic Information System) engine index tile, use this coordinate system.
Conversion regime between tile coordinate and Mercator's coordinate is as follows.
On map, the coordinate of tile belonging to arbitrfary point is:
Tile.x＝floor((Mercator.x+20037508.3427892)/(20037508.3427892/2^level))
Tile.y＝floor((20037508.3427892-Mercator.y)/(20037508.3427892/2^level))
Wherein, Mercator.x represents the Mercator's coordinate in X-direction, and Mercator.y represents the Mercator's coordinate in Y direction, and Tile.x represents the tile coordinate in X-direction, Tile.y represents the tile coordinate in Y direction, and level represents current map level.
5, image coordinate system
Image coordinate belongs to plane coordinates, and unit is pixel, and with the image upper left corner for initial point, the right side is x positive direction, and lower is y positive direction.This coordinate system is used when drawing vector graphics.
The conversion regime of image coordinate and Mercator's coordinate is as follows.
Image coordinate is identical with the conversion regime of screen coordinate and Mercator's coordinate with the conversion regime of Mercator's coordinate, only wide for screen in formula height need be replaced with figure image width high, namely, suppose that the body of a map or chart of present image is for [xmin, ymin, xmax, ymax], be Mercator's coordinate, then on image, the coordinate of any point can be obtained by following formula:
Image.x＝(Mercator.x-xmin)/(xmax-xmin)*ImageWidth
Image.y＝(ymax-Mercator.y)/(ymax-ymin)*ImageHeight
Wherein, Mercator.x represents the Mercator's coordinate in X-direction, and Mercator.y represents the Mercator's coordinate in Y direction, and Image.x represents the image coordinate in X-direction, and Mercator.y represents the image coordinate in Y direction.
In embodiments of the present invention, the storage mode of base map data is made up of a large amount of static tile images, each tile all stores on the server in strict accordance with location figure level, y coordinate, x coordinate three-decker, when user browses map, the GIS engine meeting corresponding position of automatic search, the tile of correspondence is spliced into complete image, shows user.In order to obtain more high-resolution image, need to improve the stitching algorithm of existing GIS engine, the base map stitching algorithm of the embodiment of the present invention can according to the sectional drawing scope of user's input and resolution, automatic converted coordinate, splicing calculates required tile index, then is spliced into complete image.
A complete base map uniquely can be determined by map resolution and rectangular extent two parameters, map resolution is uniquely determined by current map level again, and rectangular extent relates to these four subparameters of rectangle upper and lower, left and right four angular coordinate, so the process of splicing base map can be reduced to drag:
Input: map level, xmin, ymin, xmax, ymax (map display area four angular coordinate)
Export: base map image
In order to splice base map, screen coordinate corresponding for the map display area corner of client-side, while the map datum in described resolution and described screenshot area is sent to described server, is also sent to described server by client.It should be noted that, electronic chart interactive interface exists one, and for showing the region of electronic chart, this region is generally square or rectangular, the corner of described map display area corner and described square or rectangular.Wherein, the screen coordinate that described map display area corner is corresponding is that the position calculation in screen draws according to screen four angular coordinate and map display area.
The performing step of above-mentioned model and step 203 is:
1, the screen coordinate of the map display area corner of client-side is obtained;
2, in the map level determined (the map level that namely above-mentioned resolution is corresponding), screen coordinate corresponding for the map display area corner of described client-side is converted to Mercator's coordinate;
3, be tile coordinate by described Mercator's Coordinate Conversion;
4, according to described tile coordinate, obtain all map tile in described map display area, the tile coordinate that namely corner, viewing area is corresponding according to the map, just can index all tiles in whole map display area;
5, described all map tile are utilized to be spliced into electronic chart base map in described map display area;
6, by part unnecessary in base map being cropped, with from the electronic chart base map in described map display area, the electronic chart base map in described screenshot area is intercepted.
Step 204: described server is according to described map datum map making information on described map base map.
In electronic chart, except base map data, contain a large amount of vector datas (as provincial boundaries) and user annotation (the POI point checked out as user and icon, traffic route) etc. toward contact, the map datum that namely described client is sent to described server comprises: user annotation information and the map datum be stored in described server side database.
After having spliced base map, next step operation has been exactly that these these map graphs and relevant information and user annotation information are plotted on base map.The map datum (figure and markup information) that front end page is imported into has been resolved into corresponding JavaBean, according to these map datums, drawing practice in being wrapped by java.awt.Graphics2D can be plotted on base map all graphical informations and markup information, as point, line, polygon, icon etc.Because needs utilize image coordinate to draw, and described client is sent to the map datum of described server for Mercator's coordinate data, therefore, described server needs described Mercator's coordinate data to be converted to image coordinate data, and then map making information on the map base map that is spliced in step 203 according to described image coordinate data, described cartographic information comprises the information that all map images in storage screenshot area in a database and user marked afterwards.
Step 205: drawn sectional drawing image address is sent to described client by described server, so that described client downloads drawn sectional drawing image according to described sectional drawing image address, i.e. the panorama sketch of screenshot area.
When the panorama sketch in screenshot area is all drawn after generation, the address of panorama sketch is sent to client by server, determine whether download by user, user is by after the panorama sketch in client downloads screenshot area, just can show, display be screenshot area panorama sketch definitely in figure level.
The electronic chart panorama sketch acquisition methods that the embodiment of the present invention provides, client obtains the screenshot area that user chooses in electronic chart indication range, and obtain the resolution to described screenshot area of user's input, the map level that described resolution is corresponding, server splices the map base map in the described screenshot area that to belong in this map level and the cartographic information on map base map, and the address of drawing image is sent to client so that client downloads image.Visible, the resolution that the embodiment of the present invention is arranged according to user, the panorama sketch that can realize arbitrary resolution is downloaded, have nothing to do with the resolution of screen itself, be no matter computer, mobile phone, flat board can downloading high definition panorama sketch, in addition, panorama sketch downloading process is automatically spliced, faster than Prof. Du Yucang speed, efficiency is high, saving cost.
See Figure 10, be the composition schematic diagram of the electronic chart panorama sketch acquisition system that the embodiment of the present invention provides, described system comprises client 1001 and server 1002:
Described client 1001, for obtaining the screenshot area that user chooses in electronic chart indication range, and obtain the resolution to described screenshot area of user's input, the map datum of the vector form in described resolution and the described screenshot area that reads from described client-side is sent to described server 1002;
Described server 1002, for determining the map level that described resolution is corresponding, and the map base map spliced in the described screenshot area that to belong in described map level, according to described map datum map making information on described map base map, drawn sectional drawing image address is sent to described client 1001, so that described client 1001 downloads drawn sectional drawing image according to described sectional drawing image address.
In embodiments of the present invention, described client 1001 has the screenshot area chosen in electronic chart indication range for obtaining user in the following manner:
The screenshot area that the screenshot box that acquisition user utilizes described client to show is selected at electronic chart indication range inside casing;
Or, obtain user and choose by touch screen the screenshot area that mode selects at electronic chart indication range inner ring;
Or described area item is also sent to described server by the area item that acquisition user selects from predeterminable area option, and described server side saves the profile information of predeterminable area in electronic chart; Obtain the profile information of predeterminable area corresponding to described area item that described server returns, using the profile information that obtains as the screenshot area to shown electronic chart.
In embodiments of the present invention, described client 1001 has in the following manner the map datum of the vector form in the described screenshot area read from described client-side being sent to described server:
Described map datum is converted to Json form by described client, and by Post request method, the map datum of described Json form is sent to described server;
Described server, also for resolving the map datum of described Json form, and utilizes the map datum after predefined JavaBean storing and resolving.
In embodiments of the present invention, described client 1001, also for while the map datum in described resolution and described screenshot area is sent to described server 1002, screen coordinate corresponding for the map display area corner of described client 1001 side is sent to described server 1002;
Described client 1001 has the map base map for splicing in the following manner in the described screenshot area to belong in described map level:
In the map level determined, screen coordinate corresponding for the map display area corner of described client-side is converted to Mercator's coordinate;
Be tile coordinate by described Mercator's Coordinate Conversion;
According to described tile coordinate, obtain all map tile in described map display area, and utilize described all map tile to be spliced into electronic chart base map in described map display area;
From the electronic chart base map in described map display area, intercept the electronic chart base map in described screenshot area.
In embodiments of the present invention, described client 1001 is sent to the map datum of described server 1002 for Mercator's coordinate data, and described server 1002 has for drawing described cartographic information in the following manner:
Described Mercator's coordinate data is converted to image coordinate data by described server 1002, according to described image coordinate data map making information on described map base map.
In embodiments of the present invention, described map datum comprises: user annotation information and the map datum be stored in described server 1002 side data storehouse.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that all or part of step in above-described embodiment method can add required general hardware platform by software and realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network communication equipments such as such as media gateway, etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
It should be noted that, for system disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.Also it should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (12)
1. an electronic chart panorama sketch acquisition methods, is characterized in that, described method is applied to a kind of electronic chart panorama sketch comprising client and server and obtains system, and described method comprises:
Described client obtains the screenshot area that user chooses in electronic chart indication range, and obtains the resolution to described screenshot area of user's input;
The map datum of the vector form in described resolution and the described screenshot area that reads from described client-side is sent to described server by described client;
Described server determines the map level that described resolution is corresponding, and splices the map base map in the described screenshot area that to belong in described map level;
Described server is according to described map datum map making information on described map base map;
Drawn sectional drawing image address is sent to described client by described server, so that described client downloads drawn sectional drawing image according to described sectional drawing image address.
2. method according to claim 1, is characterized in that, the screenshot area that described acquisition user chooses in electronic chart indication range, comprising:
The screenshot area that the screenshot box that acquisition user utilizes described client to show is selected at electronic chart indication range inside casing;
Or, obtain user and choose by touch screen the screenshot area that mode selects at electronic chart indication range inner ring;
Or described area item is also sent to described server by the area item that acquisition user selects from predeterminable area option, and described server side saves the profile information of predeterminable area in electronic chart; Obtain the profile information of predeterminable area corresponding to described area item that described server returns, using the profile information that obtains as the screenshot area to shown electronic chart.
3. method according to claim 1, is characterized in that, the map datum of the vector form in the described screenshot area read from described client-side is sent to described server by described client, comprising:
Described map datum is converted to Json form by described client, and by Post request method, the map datum of described Json form is sent to described server;
In described client by after being sent to described server from the map datum in the described screenshot area that described server side reads, also comprise:
The map datum of Json form described in described server parses, and utilize the map datum after predefined JavaBean storing and resolving.
4. method according to claim 1, is characterized in that, described client also comprises while the map datum in described resolution and described screenshot area is sent to described server:
Screen coordinate corresponding for the map display area corner of described client-side is sent to described server;
The described map base map spliced in the described screenshot area that to belong in described map level, comprising:
In the map level determined, screen coordinate corresponding for the map display area corner of described client-side is converted to Mercator's coordinate;
Be tile coordinate by described Mercator's Coordinate Conversion;
According to described tile coordinate, obtain all map tile in described map display area, and utilize described all map tile to be spliced into electronic chart base map in described map display area;
From the electronic chart base map in described map display area, intercept the electronic chart base map in described screenshot area.
5. method according to claim 1, is characterized in that, described client is sent to the map datum of described server for Mercator's coordinate data, and described server, according to described map datum map making information on described map base map, comprising:
Described Mercator's coordinate data is converted to image coordinate data by described server, according to described image coordinate data map making information on described map base map.
6. the method according to any one of claim 1 to 5, is characterized in that, described map datum comprises: user annotation information and the map datum be stored in described server side database.
7. electronic chart panorama sketch obtains a system, and it is characterized in that, described system comprises client and server:
Described client, for obtaining the screenshot area that user chooses in electronic chart indication range, and obtain the resolution to described screenshot area of user's input, the map datum of the vector form in described resolution and the described screenshot area that reads from described client-side is sent to described server;
Described server, for determining the map level that described resolution is corresponding, and the map base map spliced in the described screenshot area that to belong in described map level, according to described map datum map making information on described map base map, drawn sectional drawing image address is sent to described client, so that described client downloads drawn sectional drawing image according to described sectional drawing image address.
8. system according to claim 7, is characterized in that, described client has the screenshot area chosen in electronic chart indication range for obtaining user in the following manner:
The screenshot area that the screenshot box that acquisition user utilizes described client to show is selected at electronic chart indication range inside casing;
Or, obtain user and choose by touch screen the screenshot area that mode selects at electronic chart indication range inner ring;
Or described area item is also sent to described server by the area item that acquisition user selects from predeterminable area option, and described server side saves the profile information of predeterminable area in electronic chart; Obtain the profile information of predeterminable area corresponding to described area item that described server returns, using the profile information that obtains as the screenshot area to shown electronic chart.
9. system according to claim 7, is characterized in that, described client has in the following manner the map datum of the vector form in the described screenshot area read from described client-side being sent to described server:
Described map datum is converted to Json form by described client, and by Post request method, the map datum of described Json form is sent to described server;
Described server, also for resolving the map datum of described Json form, and utilizes the map datum after predefined JavaBean storing and resolving.
10. system according to claim 7, is characterized in that,
Described client, also for while the map datum in described resolution and described screenshot area is sent to described server, is sent to described server by screen coordinate corresponding for the map display area corner of described client-side;
Described client has the map base map for splicing in the following manner in the described screenshot area to belong in described map level:
In the map level determined, screen coordinate corresponding for the map display area corner of described client-side is converted to Mercator's coordinate;
Be tile coordinate by described Mercator's Coordinate Conversion;
According to described tile coordinate, obtain all map tile in described map display area, and utilize described all map tile to be spliced into electronic chart base map in described map display area;
From the electronic chart base map in described map display area, intercept the electronic chart base map in described screenshot area.
11. systems according to claim 7, is characterized in that, described client is sent to the map datum of described server for Mercator's coordinate data, and described server has for drawing described cartographic information in the following manner:
Described Mercator's coordinate data is converted to image coordinate data by described server, according to described image coordinate data map making information on described map base map.
12. systems according to any one of claim 6 to 11, it is characterized in that, described map datum comprises: user annotation information and the map datum be stored in described server side database.
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