CN105260450A - Electronic map issuing method and apparatus and electronic map display method - Google Patents
Electronic map issuing method and apparatus and electronic map display method Download PDFInfo
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Abstract
The present invention provides an electronic map issuing method and relates to the field of electronic information processing. According to the electronic map issuing method, a data aggregation manner is used for fusing tile data of a plurality of loose-type map tiles used by a conventional map engine into an integral file in a predetermined manner; and then, the integral file is issued by the map engine. Therefore when the map tiles are copied, a storage position of the file can be entirely read so as to simplify the process of copying the tile data of a plurality of loose-type map tiles and improving the entire copying speed of the tile data.
Description
Technical field
The present invention relates to electronic information process field, in particular to electronic chart dissemination method, device and display method for electronic map.
Background technology
Electronic chart also claims numerical map, mainly refers to use digital storage technique, map datum is carried out the map storing and consult.Along with the development of electronic information technology, traditional paper map gradually substitute by electronic chart.Compared to traditional paper map, the use of electronic chart is more convenient and flexible, especially in cartographic information amount, be paper map incomparable.Also just thus, the attention of the height that electronic chart obtains in recent years and unprecedented development, common electronic chart has Baidu's map, Google Maps, high moral map and search dog map etc.
Electronic chart, before formal use, needs first to be divided into a large amount of " small pieces " by a complete map usually, i.e. map section (in each map section, all having this map to cut into slices the geodata of corresponding region).Afterwards, the section of this map is supplied to and specifies engine map (that is, map section being issued), so that engine map transfers the section of corresponding map according to the instruction of user, and further the map be deployed into section is supplied to user.
But the engine map that the common electronics maps such as Baidu's map and Google Maps use is all adopt the section of loose type map to preserve map datum.When these map datums move time, usually require a great deal of time and copy, especially at current large data age, the data scale in map section is all riseing every day, and the migration of this map datum consumes time and resource greatly.
Summary of the invention
The object of the present invention is to provide electronic chart dissemination method, to improve the efficiency of map datum migration.
First aspect, embodiments provides electronic chart dissemination method, comprising:
Terminal obtains the slice of data of multiple loose type map section;
Terminal is identical by level, and the slice of data of the adjacent multiple loose type maps section in locus, be stored in same file destination, to generate the section of compact map;
The section of compact map is issued by engine map by terminal.
In conjunction with first aspect, embodiments provide the first possible embodiment of first aspect, wherein, also comprise:
Terminal is each compact map section generating configuration file, carries the map parameter of compact map section in configuration file;
Configuration file is stored in engine map by terminal.
In conjunction with first aspect, embodiments provide the embodiment that the second of first aspect is possible, wherein, terminal is identical by level, and the slice of data of the adjacent multiple loose type maps section in locus, be stored in same file destination, comprise with the step generating the section of compact map:
Each slice of data that terminal is cut into slices for loose type map, according to line number and the row number of current slice data, generates the title of the file destination of current slice data;
Terminal, according to the title of file destination, judges whether file destination exists; If not, then file destination is set up;
Terminal stores current slice data and corresponding index data in file destination, to generate the section of compact map.
In conjunction with first aspect, embodiments provide the third possible embodiment of first aspect, wherein, step in file destination, store current slice data and corresponding index data comprises:
Section index file in terminal acquisition file destination and slice of data file;
Terminal, according to the line number of current slice data and row number, calculates the storage location of the side-play amount of current slice data;
Record shift quantity on the storage location of terminal in section index file;
Terminal, according to side-play amount, records slice length and current slice data in slice of data file.
In conjunction with first aspect, embodiments provide the 4th kind of possible embodiment of first aspect, wherein, terminal is according to the line number of current slice data and row number, and the title generating the file destination of current slice data comprises:
Terminal lays down a regulation according to the title preset, and adopts identifier in conjunction with the mode of the line number of current slice data and row number, to the file destination name of record current slice data.
In conjunction with first aspect, embodiments provide the 5th kind of possible embodiment of first aspect, wherein, also comprise:
Terminal is to the section of compact map, and/or the map parameter of compact map section is encrypted.
Second aspect, the embodiment of the present invention additionally provides based in first aspect, and the display method for electronic map of the electronic chart dissemination method of any one embodiment, also comprises:
Engine map obtains the request of access of user side; Wherein, request of access carries line number and the row number of slice of data;
Engine map, according to the line number in request of access and row number, is determined file destination, and from file destination, is transferred corresponding target slice data;
Target slice data send to user side by engine map, with at user side display-object slice of data.
In conjunction with second aspect, embodiments provide the first possible embodiment of second aspect, wherein, step engine map is according to the line number in request of access and row number, determine file destination, and from file destination, transfer corresponding target slice data comprise:
Engine map calculates the title of file destination according to line number entrained in request of access and row number, and searches file destination;
Engine map transfers target slice data from file destination.
In conjunction with second aspect, embodiments provide the embodiment that the second of second aspect is possible, wherein, also comprise:
Client sends map parameter to engine map and obtains request;
If engine map gets map parameter and obtains request, then return map parameter;
Client generates request of access according to the map parameter received.
In conjunction with second aspect, embodiments provide the third possible embodiment of second aspect, wherein, step engine map is transferred target slice data and is comprised from file destination:
Engine map, according to line number entrained in request of access and row number, calculates the storage location of the side-play amount of target slice data;
Engine map, in the section index file of file destination, reads side-play amount according to storage location;
Engine map, according to side-play amount, reads slice length in slice of data file;
Engine map, in slice of data file, reads target slice data according to slice length.
In conjunction with second aspect, embodiments provide the 4th kind of possible embodiment of second aspect, wherein, step engine map calculates a title for file destination according to line number entrained in request of access and row number, and searches file destination and comprise:
Lay down a regulation according to the title preset, adopt identifier in conjunction with the mode of the line number of current slice data and row number, calculate the title of file destination at target slice data place;
Use identifier location mode, search and carry in the file of identifier, line number with row number with the line number in request of access and arrange number file all conformed to, as file destination.
The third aspect, the embodiment of the present invention additionally provides electronic chart distributing device, comprising:
Acquisition module, for obtaining the slice of data of multiple loose type map section;
Storage module, for level is identical, and the slice of data of the adjacent multiple loose type maps section in locus, be stored in same file destination, to generate the section of compact map;
Release module, for issuing the section of compact map by engine map.
In conjunction with the third aspect, embodiments provide the first possible embodiment of second aspect, wherein, also comprise:
Configuration file generation module, for being each compact map section generating configuration file, carries the map parameter of compact map section in configuration file;
Configuration file storage module, for being stored in configuration file in engine map.
In conjunction with the third aspect, embodiments provide the embodiment that the second of second aspect is possible, wherein, storage module comprises:
Generation unit, for each slice of data of cutting into slices for loose type map, according to line number and the row number of current slice data, generates the title of the file destination of current slice data;
Set up unit, for the title according to file destination, judge whether file destination exists; If not, then file destination is set up;
Storage element, for storing current slice data and corresponding index data in file destination, to generate the section of compact map.
In conjunction with the third aspect, embodiments provide the third possible embodiment of second aspect, wherein, generation unit comprises:
Name subelement, for laying down a regulation according to the title preset, adopts identifier in conjunction with the mode of the line number of current slice data and row number, to the file destination name of record current slice data.
The electronic chart dissemination method that the embodiment of the present invention provides, adopt before map section is issued, in advance the section of loose type map is converted into the mode of compact map section, with prior art, direct use loose type map section is issued by engine map, thus when map section is shifted, need the data of each loose type map section of scattered reading, the data copy of being cut into slices by each loose type map is again to predetermined place, the chronic of data copy is compared, it is by transforming the loose type map obtained in advance section in advance, namely, level is identical, and locus adjacent loose type map section slice of data be stored in same file, generate a compact map section, again the section of this compact map is published in engine map afterwards, owing to have employed new data aggregate mode, compact map is made to cut into slices when copy, can directly read overall file, and then accelerate the speed of data copy.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows the loose type map section schematic diagram in the correlation technique that the embodiment of the present invention provides;
Fig. 2 shows the basic flow sheet of the electronic chart dissemination method that the embodiment of the present invention provides;
Fig. 3 shows the Optimizing Flow figure of the electronic chart dissemination method that the embodiment of the present invention provides;
Fig. 4 shows the details process flow diagram of the generation compact map section of the electronic chart dissemination method that the embodiment of the present invention provides;
Fig. 5 shows the basic flow sheet of the display method for electronic map that the embodiment of the present invention provides;
Fig. 6 shows the Optimizing Flow figure of the display method for electronic map that the embodiment of the present invention provides;
Fig. 7 shows the sequential chart of example in the display method for electronic map that the embodiment of the present invention provides;
Fig. 8 shows the basic module connection layout of the electronic chart distributing device that the embodiment of the present invention provides.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
The preferred version of the map that electronic chart is traditional as an alternative, already accept by users, use electronic chart be an indispensable part in daily life.The function that electronic chart is conventional has: geography information is consulted, locate, self-navigation etc.
Electronic chart can be divided into two parts, and a part is the user side that user uses, and another part is the network-side provided by service provider, and this network-side is also referred to as engine map.User is sent request to electronic engine by operation user side, if this request is by the certification of engine map, then engine map can return corresponding map datum to user side, afterwards user side by digital independent, the means such as to play up by electronic chart display on a display screen, watch for user.
At present, in correlation technique, common engine map, as Baidu's engine map, Google Maps engine etc., the mode that service provider all can adopt loose type map to cut into slices, to store corresponding map datum, afterwards by the section of these maps being published on engine map, and then provides Map Service to user.Specifically, as shown in Figure 1, the section of loose type map is mode by array piecemeal, and a complete plane map is divided into multiple small pieces, is stitched together by these small pieces and also just can form a complete map.When carrying out slice of data storage, also be in units of map section, by display, call required data and form one independently file is (namely, each map section formation file, the data of the corresponding region of this map section are stored) in file, afterwards these files are stored, and when needs, the file of specifying is taken out, just can present the section of multiple map by the mode such as playing up on the display of specifying, this multiple map section being stitched together just define a complete map afterwards.Use the mode of map section to preserve data and mainly contain following two advantages: 1, time local map is modified, only need the data revising certain section, and do not need all transfer whole map and revise; 2, when user carries out Consult of map, do not need whole map to be all supplied to user, but according to the operational order of user, part section is supplied to user, this greatly reduces data transmission quantity.
But the section of loose type map also has certain weak tendency, such as, when service provider is by after on Map Publication to engine map, once these data need copy or transmission, then need the data transferring the section of each loose type map respectively, and the data of these loose type maps section are scattered being stored in storage area.This just causes when copy, needs the position of each loose type map section of confirmation respectively, carries out extraction data more afterwards, then, just can copy.As, the micropolis map section of general 18 grades, slice numbers is probably about 1,000,000, and the copy migration needs time of about 1 day, if change this micropolis into certain province, or certain is national, then copy time can improve greatly.As can be seen here, the slice of data of the electronic map slice issuing out in correlation technique is not easy to copy, is not easy in other words transfer.
In view of this, this application provides electronic chart dissemination method, as shown in Figure 2, comprise the steps:
S101, terminal obtains the slice of data of multiple loose type map section;
S102, terminal is identical by level, and the slice of data of the adjacent multiple loose type maps section in locus, be stored in same file destination, to generate the section of compact map;
S103, the section of compact map is issued by engine map by terminal.
It should be noted that, terminal refers to electronic equipment that is general, that have arithmetic capability, specifically, can be as individual PC, the webserver, mobile terminal etc.
In step S101, first terminal needs to obtain the section of a large amount of loose type map, loose type map section herein, can as illustrated in above, be as Baidu's engine map, Google Maps engine the loose type map section that uses.When obtaining the slice of data of loose type map section, have two kinds of situations, the first is after forming the section of compact map, the acquisition carried out, and another kind of situation obtains when not formed and carrying out the section of gathering property map.
The storage carried out in step S102, can be understood as: multiple loose type map section is recorded in same file, or can be understood as by multiple slice of data (namely, the slice of data of loose type map section, the slice of data of indication all refers to the slice of data that loose type map is cut into slices hereinafter) be aggregated to together according to set mode, and then defining a file destination, this file destination is exactly the section of compact map.Thus, can find out, the prerequisite forming the section of compact map has multiple slice of data, otherwise the meaning of not also being polymerized.Therefore, as the explanation in the preceding paragraph, in step S101, when acquisition slice of data, two kinds of situations are had.The first situation, accessed by be, carry slice of data compact map section and at least one be not stored in compact map section (that is, file destination) in slice of data; The second situation, the accessed slice of data only had for being stored in the section of compact map.
For above-mentioned two situations, performed in step S102 also should have two kinds of storing modes mutually.The first, be that terminal will not write the slice of data in file destination, write in this file destination.The second, is respectively by each slice of data do not write in file destination, is written in newly-established file destination.These two kinds of modes are compared, and first the second storing mode needs to set up file destination.Consider that the process setting up file destination is technical scheme known in those skilled in the art, do not do too much explanation herein.
It should be noted that, the slice of data be stored in same file destination in the embodiment of the present invention requires: these slice of datas be same level and corresponding to these slice of datas map section spatially need to be adjacent.Slice of data is that same level mainly considers that the final purpose that slice of data carries out shifting is to show, if it is nugatory that namely simple data are not called, is only used to show the value that can embody slice of data.And when display, normally only have the data of same level just likely to be transferred simultaneously, and then show, therefore, the deposit data corresponding to being cut into slices by same layer map in one file, is conducive to calling fast.
The section of the map corresponding to slice of data in above-mentioned same file destination spatially needs to be adjacent, and the main object considering to set up the section of compact map conveniently the section of this compact map is sent to the port of specifying.Therefore, a complete map can be shown in order to the section of compact map can be made, avoid server/engine map when searching data, need to transfer different slice of datas to form a complete map from multiple compact map section, therefore, when the section of formation compact map, can directly the slice of data that loose type map adjacent for locus is cut into slices be stored in a file destination.Afterwards, when transferring, server/engine map just can transfer slice of data according to same file, and the map that formation one is complete further.When the slice of data being arranged in same file destination meets above-mentioned said two requirements time, the computing of engine map/server, response speed can greatly be improved, can feed back the request of user side faster.
Wherein, the multiple loose type maps section that locus is adjacent, can be understood as when being reduced to a complete map, two adjacent loose type maps sections.As in Fig. 1, with (0,0) cut into slices adjacent section have (1,0) cut into slices and (0,1) cut into slices.
After the map section determining compact, just step S103 can be performed, namely, the section of compact map is issued, the section of this compact map is provided to engine map, cut into slices to make compact map and can be stored in engine map, also just complete the issue of compact map.
Method provided by the present invention, before slice of data is published to engine map, the problem with copy time process is transferred in order to avoid using the loose type map map caused of cutting into slices, compact flower process is used in the scheme that the application provides, the slice of data of multiple loose type map section is fused in same file and has stored, and then, at needs copy with when transferring, can directly the file destination containing multiple slice of data be copied.Because file destination integrally exists, when system copies, only need just can complete searching of storage location by registration table or corresponding table lookup primary address information, and then complete copy.Therefore, when transferring, disposable for data in this file destination reading can be completed continuous print, and no longer need as in correlation technique, when the data of loose type being cut into slices read, need the memory location of searching the section of each loose type map respectively, and can carry out reading or copying after transferring.This makes the copy of slice of data and transmits more quick.
Engine map, sending when slice of data to client, needs the cartographic information first determining to know required for client, and usually, cartographic information is that the content according to the operational order of user and current electronic map is determined.As, client sends request to engine map, then need to carry the positional information (positional information comprises level, line number and the row number that map is cut into slices, and uniquely can determine a map section by level, line number and row number) of the map section expecting to obtain in this request.The positional information of map section is then that user side is determined according to the operational order (as dragged mouse, rotating mouse roller etc.) of user and map parameter.Concrete, the attribute information that what design parameter comprised is in map section, as resolution, map level, slice size etc.Thus, before engine map life's work (before transmitting slicing parameter to user side), first user side needs graph parameter definitely, only has and has grasped map parameter, clearly can need which the map section asking to obtain is.In correlation technique, map parameter normally has operator to grasp, and map parameter can stash by operator, and client or secondary development personnel only have by repeatedly asking for operator, map parameter can be obtained, but this is very inconvenient for general user.
In view of this, as shown in Figure 3, following steps are additionally provided in method provided by the present invention:
S201, terminal is each compact map section generating configuration file, carries the map parameter of compact map section in configuration file;
S202, configuration file is stored in engine map by terminal.
By step S201 and step S202, the configuration file carrying map parameter can be stored in engine map in advance, user side only needs when carrying out Map Services to carry out data interaction with engine map, and no longer need to carry out with other server or terminal exchanging (in correlation technique, if client needs to obtain map parameter, then need to ask for operator's secondary, must need to exchange with corresponding terminal or server, transmit map parameter), thus add the security of user side.
In order to search, call the section of compact map more efficiently, concrete, as shown in Figure 4, step S102, namely terminal is identical by level, and the slice of data of the adjacent multiple loose type maps section in locus, be stored in same file destination, comprise the steps: with the step generating the section of compact map
S1021, each slice of data that terminal is cut into slices for loose type map, according to line number and the row number of current slice data, generates the title of the file destination of current slice data;
S1022, terminal, according to the title of file destination, judges whether file destination exists; If not, then file destination is set up;
S1023, terminal stores current slice data and corresponding index data in file destination, to generate the section of compact map.
In step S1021, the expectation first determined is needed to store the title of the file destination of slice of data.As the description in above, have two kinds of situations when storing slice of data, the first situation has established file destination, and the second situation not yet establishes file destination.To this, in this step, first the title of the file destination (that is, expecting the file destination of storage slice of data) of current slice data is generated according to the row, column of loose type map section in whole map number (i.e. the line number of slice of data and row number).Specifically when name, the form of line number+row number can be adopted to come for file destination name, or adopt the eigenwert of the eigenwert+row of line number number to come for file destination is named.In fact, generate the title of the file destination of current slice data, be exactly the process of the file destination title calculating current slice data, a file destination of reality " generation " might not be needed.Use this kind of naming method when needs are searched, can to complete and locate fast.
Afterwards, step S1022, the title of the file destination generated according to previous step to search file destination, to determine whether there is file destination.If search less than, then set up this file destination, and perform step S1023; If can find, then localizing objects file, and perform step S1023.
Step S1023, no matter be that file destination exists, or file destination has just set up, and according to the existing way of compact map section, all needs for storing the son file of slice of data and storing the son file of index data.Wherein, the object of setting up of index data is the memory location that indicates slice of data.That is can after the memory location determining slice of data, slice of data is stored according to memory location, and generate corresponding index data according to memory location, to be indicated the position of slice of data by index data, facilitate the follow-up process transferred to carry out fast finding.
It should be noted that, before setting up file destination, operator can also first set up one or more destination folder, and this destination folder can be determine according to the level of slice of data.Be used in a destination folder depositing the identical compact map section of level.After having set up file destination, following document directory structure can be formed:
../Layers/_alllayers/Zoom/ section index file and slice of data file;
../Layers/_alllayers/Conf.xml；
Wherein, Zoom is the level conf.xml of slice of data is the configuration file carrying map parameter.
By the mode (first set up destination folder by the level of different slice of data and carry out a subseries, then carry out a subseries by section index file and slice of data file) of secondary classification.
The following describes a kind of concrete mode storing index data and slice of data (index data storing current slice data and correspondence in file destination namely in step S1023) in file destination:
11, the section index file in terminal acquisition file destination and slice of data file;
12, terminal, according to the line number of current slice data and row number, calculates the storage location of the side-play amount of current slice data;
13, record shift quantity on the storage location of terminal in section index file;
14, terminal, according to side-play amount, records slice length and current slice data in slice of data file.
As the explanation in above, before record slice of data in file destination, file destination has two states, and the first does not set up file destination, and the second has set up file destination.So, corresponding, in step 11, the section index file in its acquisition file destination and slice of data file are also have two kinds of situations, that is, these two files are all set up; Or these two files are and establish.Therefore, what in step 11, the implication of " acquisition " can be corresponding is interpreted as: the first, set up section index file and slice of data file; The second, finds section index file and slice of data file.
Establishing, or after finding section index file and slice of data file, just can calculate the storage location of side-play amount according to the line number of slice of data, row number.Namely, storage location is number for reference with the line number of slice of data, row.Due to each slice of data line number and row number can not while with the line number of other slice of datas with arrange number identical, therefore, the storage location of the side-play amount calculated also can not be identical, concrete account form can adjust according to concrete condition, as long as ensure that the storage location of the side-play amount of different slice of datas is not identical.
Afterwards, step 13, in section index file, according to the storage location calculated, side-play amount on record.And perform step 14, in slice of data, record slice length and slice of data according to side-play amount (can be understood as the code of side-play amount, or numerical value).It should be noted that, slice length is also the attribute describing slice of data, that specify the total length of slice of data, therefore after having known side-play amount (storage reference position) and slice length, just can read the slice of data of specifying.
In order to the location of file destination can be accelerated.A little adjustment can be done in the name of file destination.As in step S1021, the title that the line number of foundation slice of data and row number calculate file destination is a kind of well mode, simultaneously, which can specifically comprise: terminal lays down a regulation according to the title preset, adopt identifier in conjunction with the mode of the line number of current slice data and row number, to the file destination name of record current slice data.The mode of identifier is used, for file destination name, when searching file destination, to locate fast by identifier, thus improve seek rate.
Further again, above-mentioned employing identifier, in conjunction with the mode of the line number of current slice data and row number, to the step of the file destination name of record current slice data, can also be divided into following several step to perform:
21, calculate row eigenwert according to the line number of slice of data, concrete calculating formula is, row eigenwert=(line number/X) * X, and wherein, X is default numerical value, as 128,64 etc.That is, required by this calculating formula, line number/X asks business, asks the result of business to be multiplied with X, thus try to achieve the complementing part removing line number/X in use.Be that 128,130/X asks business if line number is 130, X, obtain 1,1*X obtains 128 afterwards, and the eigenwert of so trying to achieve is 128.
22, use the mode calculated column eigenwert as 21, that is, row eigenwert=(row number/Y) * Y, wherein, Y is default numerical value, as 128,64 etc.That is, required by this calculating formula, row number/Y asks business, asks the result of business to be multiplied with Y in use, thus tries to achieve to remove and to arrange number/the complementing part of Y.Be that 128,260/Y asks business if row number are 260, Y, obtain 2,2*X obtains 256 afterwards, and the eigenwert of so trying to achieve is 256.By the calculating of this step, also just by slice of data identical with row eigenwert for row eigenwert, same file destination can be stored into and suffer.
23, adopt the mode recording row eigenwert and increase row eigenwert after identifier after identifier, the title of calculating/generating object file.If identifier is A, then file destination can called after " A, row eigenwert, row eigenwert ", certainly, identifier can be two, is namely respectively row eigenwert and row eigenwert sets up identifier, and the name of the file destination so generated is called " A; row eigenwert, B, row eigenwert ".
Use this kind of naming method, system is when searching file destination, and can pass through first position identifiers, then reading identifier data are below as row eigenwert and row eigenwert, to improve the speed of searching.
It should be noted that, identifier and row eigenwert, or the position relationship of identifier and row eigenwert all can adjust, example herein, is only illustrative example.
Meanwhile, in order to improve the security of data, before engine map uses the section of compact map or map parameter, need the leakage being encrypted to avoid data to it.Specifically, i.e. the electronic chart dissemination method that provides of the application, also comprises: terminal is to the section of compact map, and/or the map parameter of compact map section is encrypted.The form of wherein encrypting can be digital encryption (using the modes such as formulae discovery to be encrypted), also can be that the mode by arranging file layout is encrypted.By arranging special file layout, other software None-identified/reading data can be made, thus play the effect of encryption.
In the embodiment of the application, on the basis of above-mentioned electronic chart dissemination method, additionally provide display method for electronic map.Be described display method for electronic map below, concrete, this display method for electronic map, on the basis comprising step disclosed in above-mentioned electronic chart dissemination method, as shown in Figure 5, also discloses following steps:
S501, engine map obtains the request of access of user side; Wherein, request of access carries line number and the row number of slice of data;
S502, engine map, according to the line number in request of access and row number, is determined file destination, and from file destination, is transferred corresponding target slice data;
S503, target slice data send to user side by engine map, with at user side display-object slice of data.
In step S501, request of access generated by operation user side by user.Office, user is rolling mouse, roll mouse pulley and cause interface to change on the interface of electronic chart, and be all considered as assigning corresponding instruction to user side, user side can generate corresponding request of access according to these instructions.The object generating request of access is to the concrete map datum of engine map request, therefore, can carry the line number and row number that need the slice of data obtained in request of access.Engine map just can receive request of access afterwards.
In step S502, engine map number determines file destination according to line number and row, and transfers out with line number from file destination, arranges a number corresponding slice of data, that is, target slice data.
Step S503, target slice data send to user side by engine map, thus user side is played up according to the content in target slice data, and the display finally controlled at user side presents map interface.
Describe target slice data (target slice data are in multiple slice of data) to be above recorded in file destination.Therefore, engine map carries out searching in this manner.
It should be noted that, terminal illustrated above can be an arbitrary terminal with computing power, this terminal can be can carry out a mutual network terminal with engine map, also can be a subordinate terminal of engine map, can also as operator control, for performing in the network-side of calculating.
Wherein user side is when generation visit information, needs to know map parameter in advance, and namely user side is when the operation according to user calculates line number and row number, needs to know map parameter in advance.That is, electronic chart dissemination method provided by the present invention, as shown in Figure 6, also comprises the steps:
S601, client sends map parameter to engine map and obtains request;
S602, if engine map gets map parameter obtain request, then returns map parameter;
S603, client generates request of access according to the map parameter received.
As the explanation in above, the configuration file carrying map parameter has been stored in engine map by terminal in advance, and therefore, user side can, by sending request directly to engine map, make engine map feed back corresponding map parameter.And final, client generates request of access according to map parameter.
It should be noted that, if terminal is when storage stores file destination, the destination folder (file destination determined according to the level of slice of data) set up in advance.Then also need to carry map layer level, to determine destination folder in request of access.
Below, a kind of mode using map parameter to calculate the level of slice of data, line number, row number is described, is specifically described with the non-example of sky map of Beijing area.
First, map parameter is described down, and map parameter comprises: map level, slice size, map resolution, map restricted area, map initial center point, map projection's mode, map style (as Google Maps, world map, high moral map etc.).
Concrete data are as follows:
1, figure projection pattern: EPSG:4326, map maximum region under 4326 projection patterns: [-180 ,-90,180,90];
2, resolution array: [1.40625, 0.703125, 0.3515625, 0.17578125, 0.087890625, 0.0439453125, 0.02197265625, 0.010986328125, 0.0054931640625, 0.00274658203125, 0.001373291015625, 0.0006866455078125, 0.00034332275390625, 0.000171661376953125, 0.0000858306884765625, 0.00004291534423828125, 0.000021457672119140625, 0.000010728836059570312, 0.000005364418029785156, 0.000002682209014892578, 0.000001341104507446289, 6.705522537231445e-7, 3.3527612686157227e-7], resolution array is one-dimensional array array,
3, map denotation level: [11,18];
4, map center point: [116.37787551704,39.848359888515];
5, slice size: [256,256];
6, restricted area: [115.95764846626,39.642366236171,116.79810256782,40.054353540859].
Above map parameter all when terminal generates the section of compact map, generates in the lump, and is stored in engine map.
Below, explanatorily figure level account form: current resolution=resolution array [current map level];
By the level using this formula just can calculate current map, current resolution is the resolution of the map that display is showing.
Below, illustrate line number and row number account form:
X=(horizontal ordinate-map maximum region upper left corner horizontal ordinate in the upper left corner of current region)/(width of current resolution * slice size);
Y=(ordinate-map maximum region upper left corner ordinate in the upper left corner of current region)/(height of current resolution * slice size);
Wherein, X is current line number, and Y is for working as prostatitis number.
Afterwards, can user side generate request of access, if concrete request of access can be following form: netposa/npgis/service/MapServer/getTile according to current map level, line number, row number? L=12 & X=3373 & Y=571.
Often kind of differently graph type, in calculating map level, line number, row number can slightly difference, and technician, can adaptive adjustment as requested when arranging account form.
Concrete, step S502, engine map, according to the line number in request of access and row number, determines file destination, and from file destination, transfers corresponding target slice data comprise following two steps:
Engine map calculates the title of file destination according to line number entrained in request of access and row number, and searches file destination;
Engine map transfers target slice data from file destination.
Illustrate above, the title of file destination calculates with row number according to the line number of slice of data, therefore, when searching file destination, also first should calculate the title of file destination, then searching file destination according to this title.
Afterwards, engine map calculates the storage location of side-play amount according to line number and row number, and reads side-play amount on storage location, and then finds slice length, and finally reads target slice data, namely completes searching of target slice data.
From file destination, specifically transfer target slice to carry out according to following step, that is, step engine map is transferred target slice data and is comprised from file destination:
Engine map, according to line number entrained in request of access and row number, calculates the storage location of the side-play amount of target slice data;
Engine map, in the section index file of file destination, reads side-play amount according to storage location;
Engine map, according to side-play amount, reads slice length in slice of data file;
Engine map, in slice of data file, reads target slice data according to slice length.
As the explanation in above, the record that terminal is carrying out side-play amount is, first just calculates the storage location of side-play amount, and so, herein, engine map also needs the storage location first calculating side-play amount according to line number and row number.
Afterwards, find the data of side-play amount according to storage location, then find slice length by the content described in offset data, finally read (transferring out) target slice data according to slice length.
As in above about using identifier to carry out the mode named for file destination, step engine map calculates a title for file destination according to line number entrained in request of access and row number, and searches file destination and comprise as follows:
Lay down a regulation according to the title preset, adopt identifier in conjunction with the mode of the line number of current slice data and row number, calculate the title of file destination at target slice data place;
Use identifier location mode, search and carry in the file of identifier, line number with row number with the line number in request of access and arrange number file all conformed to, as file destination.
Same, before searching file destination, also need the title first calculating file destination.Herein, the title account form that terminal uses should be identical with the account form that engine map uses.The account form of this kind of title should be that terminal informs engine map in advance, or the terminal in electronic chart dissemination method and the engine map in display method for electronic map are made an appointment.
Further, use identifier, line number and row number for after file destination name at the same time, just can search according to set mode.As preset, line number and row number are all recorded in after identifier, so when the corresponding line number of reading and row number, just first can search identifier, afterwards, directly read and are positioned at identifier data below as the line number needing to search and row number.
Below, provide an elder generation to generate compact map by terminal and cut into slices, and issued by engine map, then undertaken alternately by engine map and user side, and finally on the display of user side, show the method for electronic chart.
One, obtain the slice of data of original loose type map section:
Raw data is stored as file layout, and bibliographic structure is: map level Zoom/ arrange number/line number/.jpg/.png map slice of data.
With 8 grades, Xi'an (11 grades to 18 grades) map datum for row, total section file 95787 files, size is 222MB (MByte, a kind of Computer Storage unit), takes up room as 453MB.
Two, compact map slice creation process:
1, the name of .npsle.npslx file (namely .npsle is index file of cutting into slices, and .npslx is slice of data file) is calculated according to the level of slice of data, line number, row number.
Specifically be divided into following A-C tri-steps:
A, Hierarchical File folder naming rule: L+ level, level is less than two, and left benefit 0, facilitates program quick position to layer file, calculates destination folder by A method.
B .npsle .npslx filename mode: " R "+" block number of row "+" C "+" block numbers of row ".
C, wherein, the block number computing method of row/column are: the block number of row is that (line number/128) * 128 transfer 16 systems to, and the block number of row is, (row number/128) * 128 transfer 16 systems to, supply 4 less than 4 left benefits 0.Wherein, (line number/128) and (row number/128) are the process of computes integer business.
By B and C two step program can quick position to map section file and index file.
2, judge whether .npsle and .npslx file exists, if existed, enter next step; If there is no, then create corresponding .npsle.npslx file, and enter next step.
3, calculate the memory location of side-play amount according to ranks number, side-play amount be kept in 5 bytes of relevant position in .npslx, order be low level front, high-order rear.Because the file size of .npsle file needs 5 bytes to represent side-play amount usually.
4, slice length and the slice of data of 4 bytes is finally inserted at the file of .npsle.Because the length of slice of data needs 4 bytes to represent usually, namely can reach the object distinguishing all slice of datas, if the quantity of slice of data is too much, then can increase amount of bytes.
After step 4 performs, just complete the work of recording slice of data in file destination, also just define the section of compact map.
Terminal by repeating said process, with formed have a large amount of compact map section partial data.
Further, in the process performing above-mentioned steps, what also need correspondence is each compact map section generating configuration file, carries the map parameter of corresponding compact map section in configuration file.
Afterwards, terminal issues the section of above-mentioned compact map by engine map, and is stored in engine map by configuration file.
Afterwards, just distributing electronic Map Services can be carried out by engine map.As shown in Figure 7,
1, user side needs statement map (Map) object, imports map cases into.
2, create base map layer Layer, and send map parameter acquisition request to engine map.
3, engine map returns the map parameter of JSON form, and map parameter can be that the form be carried in configuration file returns.
4, statement NPLayer, and adds map Map object to by NPLayer, wherein, NPLayer be use the application to provide display method for electronic map shown by the layer that goes out.
5, user, by pulling or move in turn mouse roller, assigns instruction to user side.
6, the operation of user side relative users, according to the operation of user and the map parameter that gets, generates request of access, with to the corresponding map section of engine map request.
7, engine map finds the slice of data of corresponding map section according to map level, line number and row number entrained in request of access.
8, engine map, returns the slice of data of map section to user side with binary data mode.
9, map section, according to the slice of data of the map section received, by browser or other programs, is shown to browser by user side, or on display.
Wherein,
Step 2, user can obtain map style entrained in request by adjustment map parameter, and the engine map to other sends request.And use as the engine maps such as Baidu's map, sky map realize Map Service.
Step 7 can be divided into following several step:
1, system obtains section level, line number, row number in request of access.
2, according to section level, line number, row number, calculate .npsle and the .npslx file corresponding to section of request.
3, number calculate the memory location of side-play amount in .npslx file according to line number, row, and read the offset information of 5 bytes from .npslx relevant position, order be low level front, high-order rear.
4, calculate side-play amount according to offset information, the position of .npsle side-play amount is read the slice length of 4 bytes.
5, the slice of data of corresponding length is read according to slice length.
Below, the advantage of electronic chart dissemination method provided by the present invention is described down:
1, for the support of any type compact map datum, data copy migration is very convenient.
A npsle file can store (128*128) 16384 loose type map slice of datas, for the even loose type map section more than ten million more than 1,000,000 of a city, about 1 day time is often needed when map section copy, and after compact process, quantity of documents becomes geometry doubly to decline, and map copy is just simply easy.
As 1,000,000 loose type map sections, approximately form 124 files (62 (1000000/16384) individual index files and 62 section files) after treatment.
2, by being stored in engine map by the configuration file carrying map parameter, make user side comparatively fast and easily can realize Map Services.Can provide timely map parameter everywhere and demonstration.
3, in practical operation, JAVA language can be used to write code, thus support cross-platform deployment.
The embodiment of the present invention additionally provides electronic chart distributing device, as shown in Figure 8, comprises as lower module:
Acquisition module 801, for obtaining the slice of data of multiple loose type map section;
Storage module 802, for level is identical, and the slice of data of the adjacent multiple loose type maps section in locus, be stored in same file destination, to generate the section of compact map;
Release module 803, for issuing the section of compact map by engine map.
Concrete, this device, also comprises:
Configuration file generation module, for being each compact map section generating configuration file, carries the map parameter of compact map section in configuration file;
Configuration file storage module, for being stored in configuration file in engine map.
Concrete, storage module 802 comprises:
Generation unit, for each slice of data of cutting into slices for loose type map, according to line number and the row number of current slice data, generates the title of the file destination of current slice data;
Set up unit, for the title according to file destination, judge whether file destination exists; If not, then file destination is set up;
Storage element, for storing current slice data and corresponding index data in file destination, to generate the section of compact map.
Concrete, generation unit comprises:
Name subelement, for laying down a regulation according to the title preset, adopts identifier in conjunction with the mode of the line number of current slice data and row number, to the file destination name of record current slice data.
Those skilled in the art can be well understood to, and for convenience and simplicity of description, the specific works process of the system of foregoing description, device and unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
If described function using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part of the part that technical scheme of the present invention contributes to prior art in essence in other words or this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, ROM (read-only memory) (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disc or CD etc. various can be program code stored medium.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (15)
1. electronic chart dissemination method, is characterized in that, comprising:
Terminal obtains the slice of data of multiple loose type map section;
Terminal is identical by level, and the slice of data of the adjacent multiple loose type maps section in locus, be stored in same file destination, to generate the section of compact map;
Described compact map section is issued by engine map by terminal.
2. electronic chart dissemination method according to claim 1, is characterized in that, also comprise:
Terminal is each described compact map section generating configuration file, carries the map parameter of described compact map section in described configuration file;
Described configuration file is stored in described engine map by terminal.
3. electronic chart dissemination method according to claim 2, it is characterized in that, described terminal is identical by level, and the slice of data of the adjacent multiple loose type maps section in locus, be stored in same file destination, comprise with the step generating the section of compact map:
Each slice of data that terminal is cut into slices for described loose type map, according to line number and the row number of current slice data, generates the title of the file destination of described current slice data;
Terminal, according to the title of described file destination, judges whether described file destination exists; If not, then described file destination is set up;
Terminal stores described current slice data and corresponding index data in described file destination, to generate the section of described compact map.
4. electronic chart dissemination method according to claim 3, is characterized in that, the index data storing described current slice data and correspondence described in step in described file destination comprises:
Terminal obtains section index file in described file destination and slice of data file;
Terminal, according to the line number of described current slice data and row number, calculates the storage location of the side-play amount of described current slice data;
The described storage location of terminal in described section index file records described side-play amount;
Terminal, according to described side-play amount, records slice length and described current slice data in described slice of data file.
5. electronic chart dissemination method according to claim 3, is characterized in that,
Described terminal is according to the line number of current slice data and row number, and the title generating the file destination of described current slice data comprises:
Terminal lays down a regulation according to the title preset, adopt identifier in conjunction with current slice data line number and row number mode, to record described current slice data file destination name.
6. electronic chart dissemination method according to claim 2, is characterized in that, also comprise:
Terminal is cut into slices to described compact map, and/or the map parameter of described compact map section is encrypted.
7., based on the display method for electronic map of the electronic chart dissemination method according to any one of claim 1-6, it is characterized in that, also comprise:
Engine map obtains the request of access of user side; Wherein, described request of access carries line number and the row number of slice of data;
Engine map, according to the line number in described request of access and row number, is determined described file destination, and from described file destination, is transferred corresponding target slice data;
Described target slice data send to described user side by engine map, to show described target slice data at described user side.
8. display method for electronic map according to claim 7, is characterized in that,
Step engine map, according to the line number in described request of access and row number, is determined described file destination, and from described file destination, is transferred corresponding target slice data comprise:
Engine map calculates the title of file destination according to line number entrained in described request of access and row number, and searches described file destination;
Engine map transfers described target slice data from described file destination.
9. display method for electronic map according to claim 8, is characterized in that, also comprises:
Client sends map parameter to described engine map and obtains request;
If described engine map gets described map parameter and obtains request, then return described map parameter;
Client generates described request of access according to the described map parameter received.
10. display method for electronic map according to claim 8, is characterized in that, engine map described in step is transferred described target slice data and comprised from described file destination:
Engine map, according to line number entrained in described request of access and row number, calculates the storage location of the side-play amount of described target slice data;
Engine map, in the section index file of described file destination, reads described side-play amount according to described storage location;
Engine map, according to described side-play amount, reads slice length in described slice of data file;
Engine map, in described slice of data file, reads described target slice data according to described slice length.
11. display method for electronic map according to claim 8, is characterized in that, engine map described in step calculates a title for file destination according to line number entrained in described request of access and row number, and search described file destination and comprise:
Lay down a regulation according to the title preset, adopt identifier in conjunction with current slice data line number and row number mode, calculate the title of the file destination at described target slice data place;
Use identifier location mode, search in the file carrying described identifier, line number with row number with the line number in request of access and arrange number file all conformed to, as described file destination.
12. electronic chart distributing devices, is characterized in that, comprising:
Acquisition module, for obtaining the slice of data of multiple loose type map section;
Storage module, for level is identical, and the slice of data of the adjacent multiple loose type maps section in locus, be stored in same file destination, to generate the section of compact map;
Release module, for issuing described compact map section by engine map.
13. electronic chart distributing devices according to claim 12, is characterized in that, also comprise:
Configuration file generation module, for being each described compact map section generating configuration file, carries the map parameter of described compact map section in described configuration file;
Configuration file storage module, for being stored in described configuration file in described engine map.
14. electronic chart distributing devices according to claim 13, it is characterized in that, described storage module comprises:
Generation unit, for each slice of data for described loose type map section, according to line number and the row number of current slice data, generates the title of the file destination of described current slice data;
Set up unit, for the title according to described file destination, judge whether described file destination exists; If not, then described file destination is set up;
Storage element, for storing described current slice data and corresponding index data in described file destination, to generate the section of described compact map.
15. electronic chart distributing devices according to claim 14, is characterized in that,
Described generation unit comprises:
Name subelement, for laying down a regulation according to the title preset, adopt identifier in conjunction with current slice data line number and row number mode, to record described current slice data file destination name.
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| CN113342916B (en) * | 2021-06-22 | 2024-01-26 | 中煤航测遥感集团有限公司 | Geographic tag image file format data processing method and device and electronic equipment |
| CN116680725A (en) * | 2023-07-27 | 2023-09-01 | 天津市测绘院有限公司 | Encryption and decryption method and system for ArcGIS compact map tiles |
| CN116680725B (en) * | 2023-07-27 | 2023-10-13 | 天津市测绘院有限公司 | Encryption and decryption method and system for ArcGIS compact map tiles |
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