CN103970835A - Vector map data storage method and system - Google Patents
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Abstract
The invention discloses a vector map data storage method and system, and belongs to the field of mobile geographic information systems. The method includes the steps of firstly, selecting a map level, gridding a map according to the longitude and latitude range of the map and the selected map level, and dividing the map into a plurality of grid units; secondly, determining the grid units where map objects are located according to the longitude and latitude coordinates of the map objects in original vector map data, and putting the map objects in the grid units; thirdly, setting up the mapping relations between the map objects in the grid units and attribute data of the map objects; fourthly, storing longitude and latitude coordinate data and attribute data of the map objects in the grid units. When data storage is conducted through the method and the system, data can be quite conveniently downloaded to a mobile intelligent terminal to serve as offline map data, and therefore data traffic is reduced, map display is accelerated, and user experience is improved.
Description
Technical field
The present invention relates to mobile GIS(Geographic Information System) field, be specifically related to a kind of map vector data storage means and system.
Background technology
Along with the fast development of modern society, mobile intelligent terminal has been played the part of more and more important role in people's daily life, mobile intelligent terminal is the bond of conventional mobile phone and the network terminal, not only can meet the demand of making a phone call, sending short messages, also comprise the several functions such as online, office, social activity, amusement, in recent years, the mobile GIS product taking moving map as representative also developed rapidly, for smart phone user brings great convenience.
Mobile GIS mainly comprise cell phone map, based on location various application, for example reward voucher, Public Transport Transfer, purchase by group, make friends, social, gather etc., most of mobile application based on location all can be used cell phone map substantially, in order to locate various information on map.
Cell phone map is the basic application of mobile GIS, it provides various basic GIS facilities, realize the functions such as location, map shows for other application, in cell phone map, most important part is map datum, because hardware resource and the network bandwidth of mobile device are limited, therefore harsher to the requirement of map datum, require map datum not only to want size little, and can inquire about soon, due key attribute data can not lack simultaneously.
The map datum that early stage cell phone map uses is the map section of PNG or JPG form, mobile phone is all to surf the Net by mobile Internet conventionally, if map datum is all online request, not only flow is large, and display effect is not smooth, experience lf being influenced, and the map set of slices of all ranks size of getting up is too large, often good hundreds of million, even if want to download in advance on mobile phone with the form of off-line data, also extremely wastes time and energy.
Summary of the invention
For the defect existing in prior art, the object of the present invention is to provide a kind of map vector data storage means and system, by the method and system provide size little, inquire about fast map vector data.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of map vector data storage means, comprises the following steps:
(1) a selected map rank, map is carried out gridding by longitude and latitude scope according to the map and selected map rank, and described gridding refers to that by map partitioning be several grid cells;
(2) determine the grid cell at map object place according to the latitude and longitude coordinates of map object in original map vector data, map object is put in order in grid cell;
(3) set up the mapping relations of the attribute data of map object in grid cell and map object;
(4) repeating step (1), until complete step (1)～(3) under all map ranks;
(5) latitude and longitude coordinates data and the attribute data of the map object in save mesh unit.
Further, a kind of map vector data storage means as above, in step (5), before the latitude and longitude coordinates data and attribute data of the map object in save mesh unit, also comprises:
The latitude and longitude coordinates data of the map object in the grid cell under different map ranks are carried out to tolerance filtration, and the concrete mode that tolerance is filtered is:
If the data magnitude of the latitude and longitude coordinates data of the map object under two map ranks is less than setting tolerance, delete the latitude and longitude coordinates data of the map object under less map rank.
Further, a kind of map vector data storage means as above, in step (1), described map rank refers to the level of zoom of map, and map rank is larger, and the longitude and latitude scope of each grid cell is less.
Further, a kind of map vector data storage means as above, in step (1), the concrete mode that map is carried out gridding by longitude and latitude scope according to the map and selected map rank is:
If selected map rank is n, n is natural number;
The longitude and latitude scope of calculating each grid cell, computing formula is:
Longitude scope/2 of the longitude scope=map of grid cell
n;
Latitude scope/2 of the latitude scope=map of grid cell
n;
According to the longitude and latitude scope of grid cell, map is carried out to gridding.
Further, a kind of map vector data storage means as above, in step (2), after the latitude and longitude coordinates data of map object are compressed, then puts in order map object in grid cell; The latitude and longitude coordinates data of map object are compressed and referred to the longitude and latitude scope of the grid cell at the latitude and longitude coordinates place of object according to the map, convert the absolute latitude and longitude coordinates of map object to relative latitude and longitude coordinates.
Further again, a kind of map vector data storage means as above, the concrete mode that map object is put in order in grid cell is:
If map object is a little, directly determine the grid cell at this place according to the latitude and longitude coordinates of point;
If map object is line or face, by after line or face cutting, determine respectively the grid cell at the object place after cutting according to the latitude and longitude coordinates of the object after cutting.
Further, a kind of map vector data storage means as above, in step (5), converts relative coordinate after integer data coordinates to, then the coordinate data of map object in save mesh unit.
A kind of map vector data storage system, comprising:
Map gridding module, for traveling through map rank, and a selected map rank, map is carried out gridding by longitude and latitude scope according to the map and selected map rank, and described gridding refers to that by map partitioning be several grid cells;
Map object is put in order module, for determine the grid cell at map object place according to the latitude and longitude coordinates of original map vector data map object, map object is put in order in grid cell;
Mapping relations are set up module, for setting up the mapping relations of the map object of grid cell and the attribute data of map object;
Data memory module, for latitude and longitude coordinates data and the attribute data of the map object of save mesh unit.
Further, a kind of map vector data storage system as above, also comprises:
Tolerance filtering module, for the latitude and longitude coordinates data of the map object of the grid cell under different map ranks are carried out to tolerance filtration, the concrete mode that tolerance is filtered is:
If the data magnitude of the latitude and longitude coordinates data of the map object under two map ranks is less than setting tolerance, delete the latitude and longitude coordinates data of the map object under less map rank.
Further again, a kind of map vector data storage system as above, described a kind of map vector data storage system, described map gridding module comprises:
Map rank is selected unit, and for selected map rank, establishing selected map rank is n, and n is natural number;
Longitude and latitude range computation unit, for calculating the longitude and latitude scope of each grid cell, computing formula is:
Longitude scope/2 of the longitude scope=map of grid cell
n;
Latitude scope/2 of the latitude scope=map of grid cell
n;
Gridding unit, carries out gridding for the longitude and latitude scope according to grid cell by map.
Beneficial effect of the present invention is: adopt method and system of the present invention, can obtain that data volume is little, diagram data off-line that can fast query, be particularly useful for data in advance downloaded stored in mobile intelligent terminal, by the cell phone map access local data of mobile intelligent terminal, having saved flow and map, to load data fast, improved user's experience.
Brief description of the drawings
Fig. 1 is the structured flowchart of a kind of map vector data storage system in the specific embodiment of the invention;
Fig. 2 is the process flow diagram of a kind of map vector data storage means in the specific embodiment of the invention;
Fig. 3 is that in embodiment, map rank is the schematic diagram after the map gridding of 2 o'clock.
Embodiment
Below in conjunction with Figure of description and embodiment, the present invention is described in further detail.
Fig. 1 shows the structured flowchart of a kind of map vector data storage system in the specific embodiment of the invention, this system comprises that map gridding module 11, map object are put in order module 12, mapping relations are set up module 13, tolerance filtering module 14 and data memory module 15, wherein:
Map gridding module 11 is for traveling through map rank, and a selected map rank, and map is carried out gridding by longitude and latitude scope according to the map and selected map rank, and described gridding refers to that by map partitioning be several grid cells; This module has comprised that map rank selectes unit, longitude and latitude range computation unit and gridding unit, wherein,
Map rank is selected unit, and for selected map rank, establishing selected map rank is n, and n is natural number;
Longitude and latitude range computation unit, for calculating the longitude and latitude scope of each grid cell, computing formula is:
Longitude scope/2 of the longitude scope=map of grid cell
n;
Latitude scope/2 of the latitude scope=map of grid cell
n;
Gridding unit, carries out gridding for the longitude and latitude scope according to grid cell by map.
Map object is put in order module 12 for determine the grid cell at map object place according to the latitude and longitude coordinates of original map vector data map object, and map object is put in order in grid cell;
Mapping relations are set up module 13 for setting up the mapping relations of the map object of grid cell and the attribute data of map object;
Tolerance filtering module 14 is for the latitude and longitude coordinates data of the map object of the grid cell under different map ranks are carried out to tolerance filtration, and the concrete mode that tolerance is filtered is:
If the data magnitude of the latitude and longitude coordinates data of the map object under two map ranks is less than setting tolerance, delete the latitude and longitude coordinates data of the map object under less map rank.
Data memory module 15 is for latitude and longitude coordinates data and the attribute data of the map object of save mesh unit.
Fig. 2 shows the process flow diagram of a kind of map vector data storage means in the specific embodiment of the invention, and the method comprises the following steps:
Step S21: map is carried out gridding processing by longitude and latitude scope according to the map and selected map rank;
A selected map rank, map is carried out gridding by longitude and latitude scope according to the map and selected map rank, and described gridding refers to that by map partitioning be several grid cells.Described map rank refers to the level of zoom of map, and map rank is larger, and the longitude and latitude scope of each grid cell is approximately little.
Map rank can be set as required, the map level range of for example drafting is 0-20 level, after selected map rank, under selected rank, map is carried out to rasterizing processing, the maximum level of choosing map when preferred selected map rank first, maximum map rank described above is 20.
Map shows as a rectangle frame taking the form of geometric object on mobile intelligent terminal, gridding is divided into this rectangle frame several little rectangle frames exactly, obtain some rectangular nodes unit, all little side's rectangular blocks are combined and have just formed whole map, the longitude scope of global map is-180 degree～180 degree, latitude is-90 degree～90 degree (the positive and negative east longitude west longitude that represents respectively for precision in this embodiment represents north latitude south latitude for latitude is positive and negative).The longitude and latitude scope of grid cell is relevant with current map rank with the longitude and latitude scope of map.
The concrete mode that in this embodiment, map is carried out gridding by longitude and latitude scope according to the map and selected map rank is:
If selected map rank is n, n is natural number;
The longitude and latitude scope of each grid cell after computing grid, computing formula is:
Longitude scope/2 of the longitude scope=map of grid cell
n;
Latitude degree scope/2 of the latitude scope=map of grid cell
n;
According to the longitude and latitude scope of grid cell, map is carried out to gridding.
Concrete, for example, map rank is 2, the longitude scope=360/4=90 of grid cell, latitude scope=180/4=45, carries out schematic diagram after gridding as shown in Figure 3 to map so, and in figure, each little grid is a grid cell, for the grid cell A in figure, its concrete longitude and latitude scope covering is (minimum longitude 90, maximal accuracy 180, minimum latitude 45, maximum latitude 90), be several little rectangular nodes by which by map partitioning.If map rank is 20, longitude scope=360/2 of grid cell so
20=0.00034332275390625, latitude degree scope=180/2
20, at this moment map is just turned to more grid cell by grid.
It should be noted that, the mode that map is carried out to gridding providing in this embodiment is that the coordinate that adopts at original vector data is to carry out under the condition of plane right-angle coordinate, in general mobile intelligent terminal, the original vector data of cell phone map is all under the direct coordinate of plane adopting, after map being launched, it is a large rectangle frame that the form of one geometric object draws, the rectangle frame of outermost in Fig. 3.But for different coordinate systems, under mercator's projection's coordinate system, the computing formula of latitude scope can be different.For different coordinate systems, according to its feature, map is carried out to gridding, as long as be several fritters by map partitioning.
In the time of the longitude and latitude scope of actual computation grid cell, generally select longitude to calculate, this is decile because of map in longitudinal, calculate simple, after calculating with longitude, can determine the longitude and latitude scope of grid cell, the longitude and latitude scope of each grid cell after longitude scope according to the map and selected map level calculation gridding, account form is:
Longitude and latitude scope/2 of the longitude scope=map of grid cell
n;
The latitude scope of grid cell=
Such as the longitude scope of map is 360 degree, in the time of 20 grades, the longitude and latitude scope of grid cell is 360 degree/2
20, result is about 0.00034332275390625.
Step S22: map object is put in order in grid cell;
Determine the grid cell at map object place according to the latitude and longitude coordinates of map object in original map vector data, map object is put in order in grid cell.
Each data in original map vector data, represent a map object, such as a point on map, a line, or a face, these map objects are read out, then they are put in order in prior ready-portioned grid, for a data, directly calculate its coordinate and fall within which grid, and for line data and face data, probably cross over multiple grids, now we need to, by line or the face section of being cut into, then put in order different sections in different grids.The concrete mode of putting in order in grid cell by map object is:
If map object is a little, directly determine the grid cell at this place according to the latitude and longitude coordinates of point;
If map object is line or face, by after line or face cutting, determine respectively the grid cell at the object place after cutting according to the latitude and longitude coordinates of the object after cutting.
Original map vector data in this embodiment refers to not have treated map vector data, the actual latitude and longitude coordinates of a for example map object is (longitude 116.56, latitude 40.233), this coordinate data belongs to original map vector data, the storage format of original map vector data can be SHAPE, CSV, the international standard forms such as EXCEL, also can be self-defined vector data form, original map vector data is just used to provide the propagation of vector data, be unfavorable for the fast query of map datum and represent, if want fast query and represent, must be through special processing.
After this embodiment is compressed the latitude and longitude coordinates data of map object in original map vector data, then map object is put in order in grid cell; The latitude and longitude coordinates data of map object are compressed to the longitude and latitude scope of the grid cell at the latitude and longitude coordinates place of object according to the map that refers to, convert the absolute latitude and longitude coordinates of map object (actual latitude and longitude coordinates) to relative latitude and longitude coordinates.For example, map object is a point, its absolute latitude and longitude coordinates is (longitude 116.56, latitude 40.233), and this coordinate has been fallen longitude and latitude scope for (minimum longitude 115, maximum longitude 117, minimum latitude 39, maximum latitude 41) grid cell in, so now the relative latitude and longitude coordinates of this point can be designated as (longitude 116.56-115, latitude 40.233-39) i.e. (longitude 1.56, latitude 1.233).
Store shared space in order to save data, except absolute latitude and longitude coordinates is converted to relative latitude and longitude coordinates, can also convert the relative latitude and longitude coordinates for floating type data to integer data, as for above-mentioned relative latitude and longitude coordinates (longitude 1.56, latitude 1.233) to convert to after integer data be (longitude 1560000, latitude 1233000).Calculating centralized stores floating type needs 4 bytes, and that integer is probably used 2 bytes is just much of that, therefore, at least can save the storage space of a times in the time of data storage, has effectively dwindled the size of map datum.In addition, also will point situation while converting the storage of integer data to, if can be by 1 bytes store time, the most handy 1 bytes store, so that further reduced size.
In addition, in actual mechanical process, not every original map vector object all can be put in order in grid cell, if line object or length and the wide Pixel Dimensions that is all less than target device in the face of the outsourcing rectangle frame of elephant, this object need not be put in order in grid so, directly gives up, even if because put in order in grid, while drafting in cell phone map, also can not show out, because this object is too little, device screen shows not out.
Step S23: the mapping relations of setting up the attribute data of map object in grid cell and map object.
The attribute data (as its title, address etc.) of map object is storage separately, therefore while map object being put in order in grid cell, map object and attribute data need to be set up to mapping relations, cell phone map could be corresponding one by one with attribute data by map object like this, in map, map object correctly marked.In order to control the size of map datum, attribute data storage is also to need to carry out certain restriction, such as each map object can only be stored one to two required attribute.
Complete after this step, turn back to step S21, and after selected different map rank, repeating step S21-S23, until complete the aforesaid operations under all map ranks.After concrete selected another map rank, adopt the mode in step S21 that map is carried out to gridding processing, adopt again the mode in step S22 that the map object in raw data is put in order in the grid cell of new division, then the map object after putting in order and its attribute data are set up to mapping relations by the mode in step S23.Preferably, in the time selecting map rank, can choose according to the descending mode of map rank.
Step S24: the latitude and longitude coordinates data of the map object in grid cell are carried out to tolerance filtration;
Complete under all map ranks after the operation in step S21-step S23, the latitude and longitude coordinates data of the map object in the grid cell under different map ranks are carried out to tolerance filtration, less data volume.The concrete mode that in this embodiment, tolerance is filtered is:
If the data magnitude of the latitude and longitude coordinates data of the map object under two map ranks is less than setting tolerance, delete the latitude and longitude coordinates data of the map object under less map rank.
Wherein, the tolerance of filtering data is above-mentioned setting tolerance, it is an empirical value, can be according to actual conditions adjustment, universal law is that tolerance is less, and the data rank finally generating is more, and the corresponding meeting of data size is larger, but the gibberish that each rank checks out can a little less youngster, so-called gibberish refers to the long and wide data that are less than a screen pixels of outsourcing frame.It is too large that tolerance can not arrange, if tolerance is too large, although data size is little, the gibberish checking out can correspondingly increase, and to mobile phone map datum, drafting can cause certain pressure.Data after filtration are inconsistent with actual map rank, such as actual map rank may be 0-20 level, and may only have 5 grades after filtering, and when now cell phone map is drawn, the map rank of multiple reality will correspond in a data rank.
Step S25: latitude and longitude coordinates data and the attribute data of the map object in save mesh unit.
Latitude and longitude coordinates data and the attribute data of the map object in save mesh unit, in this embodiment, the latitude and longitude coordinates data of preferred storage are the relative latitude and longitude coordinates data of integer in step S22.By after data storage, the data of finally storage can be derived and generate new map datum, for cell phone map.
It should be noted that, in this embodiment, above-mentioned step S21-S25 is not absolute sequencing, can in actual operating process, carry out as required corresponding order adjusts, in step S23 and step S24, can complete after the operation of the step S21-S22 of map object under all map ranks, first carry out data tolerance in step S24 and filter, then set up map object after filtering and the mapping relations of its attribute data.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technology thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
1. a map vector data storage means, comprises the following steps:
(1) a selected map rank, map is carried out gridding by longitude and latitude scope according to the map and selected map rank, and described gridding refers to that by map partitioning be several grid cells;
(2) determine the grid cell at map object place according to the latitude and longitude coordinates of map object in original map vector data, map object is put in order in grid cell;
(3) set up the mapping relations of the attribute data of map object in grid cell and map object;
(4) repeating step (1), until complete step (1)～(3) under all map ranks;
(5) latitude and longitude coordinates data and the attribute data of the map object in save mesh unit.
2. a kind of map vector data storage means as claimed in claim 1, is characterized in that, in step (5), before the latitude and longitude coordinates data and attribute data of the map object in save mesh unit, also comprises:
The latitude and longitude coordinates data of the map object in the grid cell under different map ranks are carried out to tolerance filtration, and the concrete mode that tolerance is filtered is:
If the data magnitude of the latitude and longitude coordinates data of the map object under two map ranks is less than setting tolerance, delete the latitude and longitude coordinates data of the map object under less map rank.
3. a kind of map vector data storage means as claimed in claim 1 or 2, is characterized in that, in step (1), described map rank refers to the level of zoom of map, and map rank is larger, and the longitude and latitude scope of each grid cell is less.
4. a kind of map vector data storage means as claimed in claim 3, is characterized in that, in step (1), the concrete mode that map is carried out gridding by longitude and latitude scope according to the map and selected map rank is:
If selected map rank is n, n is natural number;
The longitude and latitude scope of calculating each grid cell, computing formula is:
Longitude scope/2 of the longitude scope=map of grid cell
n;
Latitude scope/2 of the latitude scope=map of grid cell
n;
According to the longitude and latitude scope of grid cell, map is carried out to gridding.
5. a kind of map vector data storage means as claimed in claim 1, is characterized in that, in step (2), after the latitude and longitude coordinates data of map object are compressed, then map object is put in order in grid cell; The latitude and longitude coordinates data of map object are compressed and referred to the longitude and latitude scope of the grid cell at the latitude and longitude coordinates place of object according to the map, convert the absolute latitude and longitude coordinates of map object to relative latitude and longitude coordinates.
6. a kind of map vector data storage means as described in claim 1 or 2 or 5, is characterized in that, the concrete mode that map object is put in order in grid cell is:
If map object is a little, directly determine the grid cell at this place according to the latitude and longitude coordinates of point;
If map object is line or face, by after line or face cutting, determine respectively the grid cell at the object place after cutting according to the latitude and longitude coordinates of the object after cutting.
7. a kind of map vector data storage means as claimed in claim 5, is characterized in that, in step (5), relative coordinate is converted to after integer data coordinates, then the coordinate data of map object in save mesh unit.
8. a map vector data storage system, comprising:
Map gridding module, for traveling through map rank, and a selected map rank, map is carried out gridding by longitude and latitude scope according to the map and selected map rank, and described gridding refers to that by map partitioning be several grid cells;
Map object is put in order module, for determine the grid cell at map object place according to the latitude and longitude coordinates of original map vector data map object, map object is put in order in grid cell;
Mapping relations are set up module, for setting up the mapping relations of the map object of grid cell and the attribute data of map object;
Data memory module, for latitude and longitude coordinates data and the attribute data of the map object of save mesh unit.
9. a kind of map vector data storage system as claimed in claim 8, is characterized in that, also comprises:
Tolerance filtering module, for the latitude and longitude coordinates data of the map object of the grid cell under different map ranks are carried out to tolerance filtration, the concrete mode that tolerance is filtered is:
If the data magnitude of the latitude and longitude coordinates data of the map object under two map ranks is less than setting tolerance, delete the latitude and longitude coordinates data of the map object under less map rank.
10. a kind of map vector data storage system as claimed in claim 8 or 9, is characterized in that, described map gridding module comprises:
Map rank is selected unit, and for selected map rank, establishing selected map rank is n, and n is natural number;
Longitude and latitude range computation unit, for calculating the longitude and latitude scope of each grid cell, computing formula is:
Longitude scope/2 of the longitude scope=map of grid cell
n;
Latitude scope/2 of the latitude scope=map of grid cell
n;
Gridding unit, carries out gridding for the longitude and latitude scope according to grid cell by map.
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| CN110580273A (en) * | 2019-09-11 | 2019-12-17 | 四川易利数字城市科技有限公司 | map GIS data processing and storing method and device and readable storage medium |
| CN113256642A (en) * | 2020-02-07 | 2021-08-13 | 百度在线网络技术（北京）有限公司 | Method, device, equipment and storage medium for determining failure area in electronic map |
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