CN105824899A - Offline map downloading method based on tile map technology - Google Patents
Offline map downloading method based on tile map technology Download PDFInfo
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- CN105824899A CN105824899A CN201610144418.9A CN201610144418A CN105824899A CN 105824899 A CN105824899 A CN 105824899A CN 201610144418 A CN201610144418 A CN 201610144418A CN 105824899 A CN105824899 A CN 105824899A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/953—Querying, e.g. by the use of web search engines
- G06F16/9537—Spatial or temporal dependent retrieval, e.g. spatiotemporal queries
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/29—Geographical information databases
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/957—Browsing optimisation, e.g. caching or content distillation
- G06F16/9574—Browsing optimisation, e.g. caching or content distillation of access to content, e.g. by caching
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0484—Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
Abstract
An offline map downloading method based on the tile map technology relates to the field of mobile phone maps and comprises the following steps: (1) obtaining a circumscribing rectangle entirely including track routes to be used by a going-out user; (2) expanding the circumscribing rectangle according to the specified peripheral range to form a target rectangle; (3) sequentially judging whether tiles in the target rectangular area is within the peripheral specified range of the track routes, making the request of downloading the tiles within the peripheral specified range to a server, and caching all the successfully downloaded tiles in the local terminal for later offline use. According to the method for downloading map tiles according to the trip route, only the map tiles within the specified range (distance) around the trip route, instead of unnecessary map tiles, are downloaded, so that the downloads are reduced, the downloading flow and the terminal memory space are saved, and accordingly, the benefit of saving both flow resources and memory space resources is achieved.
Description
Technical field
The present invention relates to cell phone map field, the WebGIS(network geographic information system built especially with tile map mode) cell phone map of framework, more specifically, relate to the method for down loading of a kind of off-line map based on tile technology.
Background technology
The most many cell phone maps are all to use based on tile map, especially for open air trip satellite map the most easily, then must use the mode of tile map.The principle of this type of map is that map is set as multiple scale, map is cut in the picture presence server of several little sections by each scale in advance, the little picture directly obtaining needs during terminal request is spliced into map, rather than generated Map the most as required by service end to terminal, greatly reduce the service end access for geodata, improve access speed.Major part cell phone map the most all provides the function that off-line map is downloaded the most at present, in the environment of having network, manual by user in advance or system has downloaded the subregion map that trip may be used automatically, will not have influence on the use of map because of network reason when user goes on a journey.But tile picture is pyramid pattern, the tile number of the most next level is 4 times of a upper level, and level is the biggest, and tile number is the most, so the total size of map file of the most detailed (scale level is the biggest) is the biggest.Comprising the map of the most detailed level (such as 18 grades), even the regional extent of a ten or twenty kilometer, the total size of file goes up G easily.The off-line map downloading mode of this type of tile map is typically to download certain administrative region or certain self-defining rectangular area at present, it there is the problem that if it is intended to use detailed map to be necessary for all tile map in whole region and all download, but wherein overwhelming majority map tile is useless for a user.
Summary of the invention
In sum, the off-line map downloading mode that it is an object of the invention to solve current tile map lacks science, there is the technical deficiency of the wasting of resources, and proposes the method for down loading of a kind of off-line map based on tile technology.
For solving technical problem proposed by the invention, the technical scheme of employing is: the method for down loading of a kind of off-line map based on tile technology, it is characterised in that described method step is as follows:
1) the track circuit that, according to user's trip will use, obtains track circuit complete packet is contained in interior circumscribed rectangle；
2), circumscribed rectangle is extended out into a target rectangle according to designated perimeter scope；
3) in the range of judging the periphery the appointment whether tile in target rectangle region is in track circuit, successively, downloading the tile in the range of periphery is specified to service end request, the tile all downloads completed all is buffered in terminal local for off-line in the future.
The technical scheme limited further as the present invention includes:
The track circuit acquisition pattern that described user's trip will use includes: user is planning acquisition the most voluntarily, or uses the historical track of other people or oneself to obtain.
Described user is user's circuit that manual described point is drawn on map at the track circuit planned the most voluntarily, or obtains the planning circuit from certain starting point to certain terminal from map server request.
The historical track of described use other people or oneself is to be stored in terminal local or be stored in the historical track circuit of oneself or other people in server high in the clouds.
Judge whether the tile in target rectangle region is in the method in the range of the periphery of track circuit is specified and is: by the beeline of the tile central point in comparison object rectangular area to the track circuit whether the most satisfied distance range specified, if meeting, downloading this tile, being unsatisfactory for, not downloading.
Tile central point specifies scope to the beeline of track circuit more than periphery, but track circuit have passed through this tiling area, and this kind of situation is also required to download this tile.
Proportion grades according to the map is mapped to the mode of file path and is saved in the memory space of terminal local by the tile downloaded, whether local map exists this tile in first checking locally stored space when showing map tile, if had, directly display this tile, without passing through network again from server request.
Described circumscribed rectangle is determined by the maximin of the longitude and latitude of all tracing points on track circuit.
The invention have the benefit that the method that the present invention downloads map tile according to travel route, can only download the map tile in travel route periphery along the line specifies scope (distance), do not download unnecessary useless map tile, reduce download as far as possible, save downloading flow and terminal storage space, reach floating resources and the beneficial effect of memory space resource saving.
Accompanying drawing explanation
Fig. 1 is tile map pyramid model structural representation；
Fig. 2 is that the present invention downloads the principle schematic of tile along track circuit.
Detailed description of the invention
Below in conjunction with accompanying drawing and currently preferred specific embodiment, the method for the present invention is further described.
With reference to shown in Fig. 1, existing tile map is pyramid model structure, and the tile number of each level is 22nIndividual, level index n starts counting up from 0, and the 0th grade is 1 tile, may generally be considered as root node, and the 1st grade is 4 tiles, and the 2nd grade is 16 tiles ... by that analogy.This just can be used to describe a regular map scale and the division of display resolution.At one tile of the 0th grade of hypothesis it can be seen that the map in whole region, the 1st grade when, every pictures is only able to display the map in 1/4 region, the 2nd grade when, just can only see the map in 1/16 region.From pyramidal top layer to bottom, map denotation scale is increasing, and resolution is more and more higher, but total body of a map or chart that all tiles of each layer represent is constant.
With reference to shown in Fig. 2, the step of the method for down loading of the off-line map based on tile technology of the present invention is as follows:
1) the track circuit that, according to user's trip will use, obtains being contained in track circuit complete packet interior circumscribed rectangle a；The size and location of described circumscribed rectangle specifically can be determined by the maximin of the longitude and latitude of all tracing points on track circuit；The bottom left vertex latitude and longitude coordinates of the most circumscribed rectangle a is (Min (lon0, lon1 ...), Min (lat0, lat1 ...)), wherein lon0, lon1 ... and lat0, lat1 ... represent the 0th, 1 respectively ... the longitude of individual tracing point and latitude.In like manner, the right vertices latitude and longitude coordinates of circumscribed rectangle a is (Max (lon0, lon1 ...), Max (lat0, lat1 ...)), thus determines circumscribed rectangle a.Wherein, the track circuit acquisition pattern that described user's trip will use includes: user is planning acquisition the most voluntarily, or uses the historical track of other people or oneself to obtain；Described user is user's circuit that manual described point is drawn on map at the track circuit planned the most voluntarily, or obtains the planning circuit from certain starting point to certain terminal from map server request；The planning preference can specified according to user, such as drives, rides, the action modes such as walking, and whether walks the options such as high speed to plan circuit.The historical track of described use other people or oneself is to be stored in terminal local or be stored in the historical track circuit of oneself or other people in server high in the clouds.
2), circumscribed rectangle a is extended out into a target rectangle A according to designated perimeter scope m；The described mode extending out into a target rectangle A is: first according to algorithm, distance m specified is converted into longitude increment Delta lon and latitude increment Delta lat, then the summit latitude and longitude coordinates of circumscribed rectangle a is individually subtracted and increases the increment of correspondence.As the lower-left of circumscribed rectangle a and the latitude and longitude coordinates of upper right are respectively (lonx, and (lony latx), laty), the target rectangle A lower-left then extended out and the latitude and longitude coordinates of upper right are respectively (lonx-Δ lon, latx-Δ lat) and (lony+ Δ lon, laty+ Δ lat).Described distance m specified is converted into longitude increment Delta lon according to algorithm with the method for latitude increment Delta lat it is: owing on equator, the corresponding arc length on the ground of longitude 1 ° is about 111km(equatorial perimeter/360), so longitude increment Delta lon=m/ (111km*cos (lat)), wherein lat can take the latitude lat=(latx+laty)/2 of central point of circumscribed rectangle a.Owing to the gap length of 1 ° of all parts of the world latitude is the most equal, about 111km/1 °.So latitude increment Delta lat=m/111km.Extend out into target rectangle A's so that complete preview track history circuit.
3) judging whether the tile in target rectangle a-quadrant is in periphery appointment scope m of track circuit, successively, download the tile in periphery specifies scope m to service end request, the tile all downloads completed all is buffered in terminal local for off-line in the future.When specifically can download the tile under different level according to tile pyramid model, judge central point minimum range l to track circuit of each tile t in target rectangle A, whether specify scope m less than periphery, satisfied then download this tile t, it is unsatisfactory for, does not downloads.It addition, tile central point specifies scope m to the beeline of track circuit more than periphery, but track circuit have passed through this tiling area, and this kind of situation is also required to download this tile, to ensure the integrity of track circuit figure accordingly.
Tile in the region (dash area) of final trajectory curb line periphery all will be downloaded, and the tile in other regions will not be downloaded.Periphery in scheme specifies scope m can regulate according to practical situation, and periphery specifies scope m the least, and the tile of required download is the fewest, more can save flow and the memory space of download.Proportion grades according to the map is mapped to the mode of file path and is saved in the memory space of terminal local by the tile downloaded, whether local map exists this tile in first checking locally stored space when showing map tile, if had, directly display this tile, without passing through network again from server request.Thus, if the tile of target area is download in advance, so that it may realize local map off-line in target area and use.
The present invention selects to download the function of level when having download, user select required level.The off-line map of the present invention program also provides for the function of name, can freely be named this target area, facilitates user to check and manage.
The off-line map of the present invention program also provide for delete function, if the off-line map of regional aim not in use by, locally stored space can be saved after deletion.
Claims (8)
1. the method for down loading of an off-line map based on tile technology, it is characterised in that described method step is as follows:
1) the track circuit that, according to user's trip will use, obtains track circuit complete packet is contained in interior circumscribed rectangle；
2), circumscribed rectangle is extended out into a target rectangle according to designated perimeter scope；
3) in the range of judging the periphery the appointment whether tile in target rectangle region is in track circuit, successively, downloading the tile in the range of periphery is specified to service end request, the tile all downloads completed all is buffered in terminal local for off-line in the future.
The method for down loading of a kind of off-line map based on tile technology the most according to claim 1; it is characterized in that: the track circuit acquisition pattern that described user's trip will use includes: user is planning acquisition the most voluntarily, or use the historical track of other people or oneself to obtain.
The method for down loading of a kind of off-line map based on tile technology the most according to claim 2, it is characterized in that: described user is user's circuit that manual described point is drawn on map at the track circuit planned the most voluntarily, or obtain the planning circuit from certain starting point to certain terminal from map server request.
The method for down loading of a kind of off-line map based on tile technology the most according to claim 2, it is characterised in that: the historical track of described use other people or oneself is to be stored in terminal local or be stored in the historical track circuit of oneself or other people in server high in the clouds.
The method for down loading of a kind of off-line map based on tile technology the most according to claim 1, it is characterized in that: judge whether the tile in target rectangle region is in the method in the range of the periphery of track circuit is specified and is: by the beeline of the tile central point in comparison object rectangular area to the track circuit whether the most satisfied distance range specified, if meeting, downloading this tile, being unsatisfactory for, not downloading.
The method for down loading of a kind of off-line map based on tile technology the most according to claim 5, it is characterized in that: the beeline of tile central point to track circuit specifies scope more than periphery, but track circuit have passed through this tiling area, this kind of situation is also required to download this tile.
The method for down loading of a kind of off-line map based on tile technology the most according to claim 1, it is characterized in that: proportion grades according to the map is mapped to the mode of file path and is saved in the memory space of terminal local by the tile downloaded, whether local map exists this tile in first checking locally stored space when showing map tile, if had, directly display this tile, without passing through network again from server request.
The method for down loading of a kind of off-line map based on tile technology the most according to claim 1, it is characterised in that: described circumscribed rectangle is determined by the maximin of the longitude and latitude of all tracing points on track circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610144418.9A CN105824899B (en) | 2016-03-15 | 2016-03-15 | A kind of method for down loading of the offline map based on tile technology |
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| CN201610144418.9A CN105824899B (en) | 2016-03-15 | 2016-03-15 | A kind of method for down loading of the offline map based on tile technology |
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| CN105824899B CN105824899B (en) | 2019-05-21 |
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Cited By (7)
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| CN107766436A (en) * | 2017-09-20 | 2018-03-06 | 广东省建设信息中心 | A kind of address correlation data processing method, user terminal and server |
| CN109388409A (en) * | 2018-09-03 | 2019-02-26 | 中新网络信息安全股份有限公司 | A kind of method that Intranet disposes map tile service and path planning |
| CN110887499A (en) * | 2018-09-11 | 2020-03-17 | 高德信息技术有限公司 | Method and terminal for processing road data and interest point data in map |
| CN111127275A (en) * | 2019-12-16 | 2020-05-08 | 武汉大千信息技术有限公司 | Method for obtaining target track complete graph of optimal map hierarchy |
| CN111143493A (en) * | 2019-11-15 | 2020-05-12 | 深圳震有科技股份有限公司 | Method for manufacturing off-line map, intelligent terminal and storage medium |
| CN115102948A (en) * | 2022-06-24 | 2022-09-23 | 阿波罗智联(北京)科技有限公司 | Automatic downloading method, device and equipment of map tiles and storage medium |
| US11492563B2 (en) | 2018-04-28 | 2022-11-08 | Beijing Sanju Environmental Protection & New Materials Co., Ltd | Conversion process for an inferior oil |
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| US20100106403A1 (en) * | 2004-07-20 | 2010-04-29 | Navteq North America, Llc | Navigation System with Downloadable Map Data |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107766436A (en) * | 2017-09-20 | 2018-03-06 | 广东省建设信息中心 | A kind of address correlation data processing method, user terminal and server |
| CN107766436B (en) * | 2017-09-20 | 2021-09-21 | 广东省建设信息中心 | Address associated data processing method, user terminal and server |
| US11492563B2 (en) | 2018-04-28 | 2022-11-08 | Beijing Sanju Environmental Protection & New Materials Co., Ltd | Conversion process for an inferior oil |
| CN109388409A (en) * | 2018-09-03 | 2019-02-26 | 中新网络信息安全股份有限公司 | A kind of method that Intranet disposes map tile service and path planning |
| CN110887499A (en) * | 2018-09-11 | 2020-03-17 | 高德信息技术有限公司 | Method and terminal for processing road data and interest point data in map |
| CN110887499B (en) * | 2018-09-11 | 2021-11-02 | 阿里巴巴（中国）有限公司 | Method and terminal for processing road data and interest point data in map |
| CN111143493A (en) * | 2019-11-15 | 2020-05-12 | 深圳震有科技股份有限公司 | Method for manufacturing off-line map, intelligent terminal and storage medium |
| CN111143493B (en) * | 2019-11-15 | 2023-08-29 | 深圳震有科技股份有限公司 | Offline map manufacturing method, intelligent terminal and storage medium |
| CN111127275A (en) * | 2019-12-16 | 2020-05-08 | 武汉大千信息技术有限公司 | Method for obtaining target track complete graph of optimal map hierarchy |
| CN115102948A (en) * | 2022-06-24 | 2022-09-23 | 阿波罗智联(北京)科技有限公司 | Automatic downloading method, device and equipment of map tiles and storage medium |
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Denomination of invention: A method of downloading offline map based on tile technology Effective date of registration: 20220422 Granted publication date: 20190521 Pledgee: Bank of Jiangsu Limited by Share Ltd. Shenzhen branch Pledgor: Shenzhen 2bulu Information Technology Co.,Ltd. Registration number: Y2022980004643 |
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