CN102298873A - Navigation electronic map data storage method and display method based on the same - Google Patents
Navigation electronic map data storage method and display method based on the same Download PDFInfo
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Abstract
The invention provides a navigation electronic map data storage method and a display method based on the same. The display method comprises the following steps of: obtaining a display range; determining a proportional scale according to the display range; determining a map sheet contained in the display range; reading data of the map sheet into a foreground display area memory, and displaying the map sheet; reading data of a brother map sheet of the displayed map sheet into a background memory buffer area; moving a display window, moving the data in the background memory buffer area into the foreground display area for display; and reading the data of the brother map sheet of the displayed map sheet into the background memory buffer area. In the storage method and the display method provided by the invention, a storage mode of using map sheet node tree is used, so that graph details can be described in detail without considering a series of problems of reaction speed caused by huge data volumes; multi-proportional-scale adaptive variation of the map data is implemented, and map interface is beautified; a virtual display buffer area and a foreground and background dual-process mechanism are built, map movement speed is greatly accelerated, and rapid graphical display and roaming are implemented.
Description
Technical field
The present invention relates to the electronic chart field, refer to a kind of map of navigation electronic date storage method especially and based on the display packing of this storage means
Background technology
In the prior art, the electronic map data display packing, it mainly comprises the steps: at first, all reads in data in the whole figure scope in the internal memory; Travel through all data again, judge that each data whether in the scope that display window comprised, if in this scope, so just directly shows these data, if not abandon this data, proceed judgement.
In the process of using above-mentioned prior art, the user has found that gradually above-mentioned display method has some defectives: at first, owing to will strive for the short reaction time, the desired data volume of this method can not be not too, this just need control the data presented amount when showing, and this must be more coarse to the details description meeting of figure, can occur the situation of distortion when serious, causes graphic presentation not attractive in appearance; Secondly, because lot of data need be read in internal memory simultaneously and the change of display window each time all needs to travel through all data, under the certain situation of hardware condition, will inevitably cause map demonstration and translational speed slow; Moreover, in actual application, indication range often is the part of graph data scope, and under the different proportion chi, level of abstraction to data is also different, and prior art can not well solve the adaptive change of data multi-scale, has caused the gibberish redundancy on the special ratios chi, thereby make that the response time of navigation terminal is longer, it is convenient inadequately to use.
Summary of the invention
The invention provides a kind of map of navigation electronic date storage method and based on the display packing of this storage means, solve in the prior art, the response time in the map handoff procedure is long, to the more coarse problem of graphics details description.
Map of navigation electronic processing method of data of the present invention comprises the steps:
1) data in the electronic chart that collects is handled;
2) set of the road data after will handling forms atlas;
3) data creating with described atlas becomes different proportion chi and separate a plurality of data files, and corresponding at least one benchmark of each engineer's scale shows rank;
4), show rank other target deletion of benchmark display level less than correspondence with in described each data file;
5) each described data file is cut apart, be divided into map sheet;
6) setting up with the map sheet is the map sheet node tree of node, complete set membership and neighbouring relations between these all map sheets of map sheet node tree reflection, and described map sheet node tree comprises all map sheets in the different reservoir.
The present invention also provides a kind of display packing of map of navigation electronic data, and described display packing comprises the steps:
A) obtain indication range by screen cursor;
B) determine engineer's scale according to described indication range;
C) determine the included map sheet of this indication range under described engineer's scale;
D) data of map sheet being read in viewing area, foreground internal memory shows;
E) data that have a fraternal map sheet of neighbouring relations with the map sheet that has shown in the map sheet node tree are read in background memory buffer zone (being the virtual memory buffer zone).
In the storage and display packing of map of navigation electronic coordinate data of the present invention, the problem of the series reaction speed that has caused without the huge data volume of excessive worry because it has adopted storage mode of map sheet node tree to make can to describe graphics details in detail, and well realized the multi-scale adaptive change of map datum, beautified map interface; Set up virtual display buffer and AM/BAM two process mechanism, can accelerate the map translational speed greatly, realize quick graphic presentation and roaming.
Description of drawings
Fig. 1 shows the process flow diagram of storing electronic map data in the storage means of map of navigation electronic data of the present invention;
Fig. 2 shows the hierarchical relationship that described electronic map data is stored in storage medium;
Fig. 3 shows the method synoptic diagram of processing electronic map data of the present invention;
Fig. 4 shows the synoptic diagram that electronic map data is divided into map sheet of the present invention;
Fig. 5 shows the process flow diagram of the display packing of map of navigation electronic data of the present invention;
Fig. 6 shows the work synoptic diagram of setting up virtual display buffer in the display packing of map of navigation electronic data of the present invention.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing in conjunction with the accompanying drawings for the ease of persons skilled in the art.
Map of navigation electronic data of the present invention comprise all road information data in the map and all other data except that road data, described road comprises highway, provincial highway, common major urban arterial highway, loop etc., other data then comprise all data beyond the attached road data, as greenery patches, water system or buildings etc.
As shown in Figure 1, the storage means of map of navigation electronic data of the present invention comprises the steps:
1) road data in the electronic chart that collects is handled;
2) set of the road data after will handling forms atlas;
3) data creating with described atlas becomes different proportion chi and separate a plurality of data files, and corresponding at least one benchmark of each engineer's scale shows rank;
4) in described each data file, rank other target deletion of benchmark display level less than correspondence will be shown;
5) respectively each described data file is cut apart, be divided into map sheet;
6) setting up with the map sheet is the map sheet node tree of node, complete set membership and neighbouring relations between these all map sheets of map sheet node tree reflection, and described map sheet node tree comprises all map sheets in the different reservoir.
Further, described storage means also comprises: set up the medium control documents in storage medium, be used to manage storage all map data files on medium, described medium control documents comprises Media Description record, accumulation layer table, atlas table and map sheet node tree, wherein: in described accumulation layer table, the corresponding engineer's scale of each accumulation layer has also write down the map sheet node encoding array and the atlas coding array that comprise in each accumulation layer; Described atlas table is used for each atlas number-mark, described atlas encoded recording included map sheet node encoding array.And described Media Description record comprises coordinate system, coordinate system parameter, coordinate unit (degree, minute, second), maximum ratio chi, data engineer's scale, language form, area code length, urban telephone figure place, area code, accumulation layer quantity, upgrades version, atlas title, remarks.
Wherein, for the method that road data is handled in the described step 1), the application number of submitting in the early time the applicant is 201010179226.4, has had comparatively detailed record in the application for a patent for invention file of denomination of invention for " the map of navigation electronic data processing method reaches the storage means based on this disposal route ".At this, state scheme in order to make the understanding skill of the present invention that those skilled in the art can be more thorough, the applicant is described in detail this step with a specific embodiment:
In this specific embodiment (as shown in Figure 3), required what handle is the coordinate data of a real road, and the approximate location of this road determines that by 5 coordinate points it is respectively: C point (41565843,14324863), D1 point (41565845,14324886), D2 point (41565836,14324874), D3 point (41565835,14324864) and D4 point (41565838,14324862).The key step of then handling this road data is as follows:
At first according to the shape of actual electronic chart, set up one with the external boundary rectangle of this electronic chart; Write down the coordinate of the summit A in the lower left corner in this boundary rectangle (southwest corner) again, i.e. (41562842,14322864); Get first coordinate points of described road, it is C point (41565843,14324863) be reference point, calculate the first order relative coordinate of this C with respect to summit A, thereby obtain the first order relative coordinate of reference Point C, i.e. (3001,1999) with respect to summit A, calculate above-mentioned other each point D1 again, D2, D3 and D4 are with respect to the second level relative coordinate of this reference Point C, be respectively D1 " (2,23); D2 " (7,9), D3 " (8; 1) and D4 " (5,-1), thus, just can determine the position of described real road in map, at last, more above-mentioned first order relative coordinate and second level relative coordinate are stored in the storage medium.
Similarly, when other data of all pending except that road data be planar/during wire data (as lake, river etc.), can handle according to aforementioned disposal route road data, and when this background data be point-like data (as buildings or bus stations time), its disposal route is the coordinate points E (41563822 that calculates this background data, 14324980) with respect to the first order relative coordinate E ' (980,2156) of summit A, as shown in Figure 3.
In addition, be multiple relation in the described step 3) step 4) between the engineer's scale of each separate data file, both be the multiple relation between the engineer's scale of each accumulation layer data file of storing.In a preferred embodiment of the present invention, the corresponding relation between accumulation layer and the engineer's scale can be as shown in table 1:
| Accumulation layer 0 | 1∶5000 |
| Accumulation layer 1 | 1∶20000 |
| Accumulation layer 2 | 1∶80000 |
| Accumulation layer 3 | 1∶160000 |
| Accumulation layer 4 | 1∶640000 |
Table 1
Wherein, can include one or more benchmark in each accumulation layer and show rank, described benchmark shows the minimum demonstration rank of each target that rank is used for representing that this accumulation layer is stored, the demonstration rank that just is stored in all targets in this accumulation layer all should show rank more than or equal to this benchmark, in the time can comprising in a certain accumulation layer that a plurality of benchmark show rank, the demonstration rank that is stored in all targets in this accumulation layer should all show that the rank middle rank is not minimum more than or equal to described benchmark.Described target is meant the simplest element, such as: a point of interest (the Water Cube), a greenery patches (certain park at an intersection), a road etc., the target of can being known as; Described demonstration rank then is the degree of concern that is subjected to that is used for representing a certain target, and the demonstration rank of this target is high more, and it is subjected to attention rate (principal characteristic) also just high more.The demonstration rank of each target is prior setting, and the user can regulate according to the demand of oneself.In preferred embodiment of the present invention, all treated electronic map datas (being target) have been divided into 0-8 totally 9 demonstration ranks according to the size that is subjected to degree of concern, show that rank is high more, it is subjected to attention rate (principal characteristic) also just high more, shows that rank is 0 target, it is subjected to attention rate (principal characteristic) minimum, and show that rank is 8 target, represents that then it is subjected to attention rate (principal characteristic) the highest, as Tian An-men, the Great Walls at Badaling etc., it shows that rank is 8.
In the preferred embodiment of the present invention, described accumulation layer and benchmark show that the corresponding relation between the rank can be as shown in table 2, by this table as can be known, in the accumulation layer 0 storage for showing rank more than or equal to all targets of 0, storage then for showing that rank is more than or equal to all targets of 4 in the accumulation layer 2.
。
| Accumulation layer 0 | 0，1 |
| Accumulation layer 1 | 2，3 |
| Accumulation layer 2 | 4 |
| Accumulation layer 3 | 5，6 |
| Accumulation layer 4 | 7，8 |
Table 2
In described step 5), it is to adopt rectangle separation method or longitude and latitude split plot design that the data file is cut apart (as shown in Figure 4, described data file shown in the figure is separated by the framing frame).Because the scope of the boundary rectangle of described electronic chart is by two coordinate representations of its lower left corner (southwest corner) and the upper right corner (northeast corner), then carries out cutting apart in this scope of described atlas.In a preferred embodiment of the present invention, the coordinate of the lower left corner of the boundary rectangle of described electronic chart (southwest corner) summit A is (41562842,14324864), and the coordinate of the corresponding upper right corner (northeast corner) summit B is (41567842,14329864), then carry out in by A, 2 institutes of B restricted portion cutting apart just of described atlas, and the selection of the span of the horizontal ordinate/ordinate of the single map sheet after cutting apart is also with reference to the coordinate of 2 of described A, B at such one.And, because the engineer's scale difference of each data file, when using rectangle separation method or longitude and latitude split plot design that this data file is cut apart, the span of the horizontal ordinate/ordinate (lat/longitude) of the single map sheet after should be according to the different regulations of engineer's scale different cutting apart.Such as, the engineer's scale of a certain data file is 1: 2000, the span of the horizontal ordinate/ordinate of the single map sheet after cutting apart is 1000 (unit lengths), and when ration of division chi was 1: 500, the span of the horizontal ordinate/ordinate of the single map sheet after then cutting apart should be 250 (unit lengths) so.
Further, described disposal route also comprises: be numbered for each node in the described map sheet node tree, described node writes down the scope coordinate of the map sheet of its representative.Described scope coordinate is two apex coordinates of this map sheet, and in this preferred embodiment, described summit X is (41566232,14327334), and the coordinate of corresponding summit Y is (41566732,14327864).
Wherein, described map sheet with neighbouring relations is meant two or more map sheets that engineer's scale is identical.And be divided into when further being partitioned into the littler map sheet of a plurality of engineer's scales when a map sheet, the map sheet before cutting apart and cut apart after the figure pair between just formed set membership.Generally speaking, in described map sheet node tree, last layer map sheet node is referred to as and is father's map sheet node, compare with this father's map sheet node be positioned at its lower floor then be referred to as subgraph width of cloth node.
Described map sheet node tree then is to become a node each planar map sheet is abstract, and to its numbering, is convenient to inquiry and management like this.This node has write down the scope coordinate of its representative map sheet.In the described map sheet node tree shown in one of them node recorded data table 3
| Node1： | 0 ， | 22 ， | 0 ， | 41566232，14327334， 41566732，14327864， | 11，12，2，-1，-1，-1， -1，-1， | 707429， | 0 |
| Node 1 | 0 accumulation layer | The 22nd atlas | The 0th map sheet | The scope of representative map sheet (lower-left, upper right coordinate) | 8 adjacent sheet node numbers | Father node numbers 707429 | The child node number is 0 |
Table 2
Further, as shown in Figure 2, described electronic map data is organized data according to the hierarchical relationship of " accumulation layer-map sheet-key element-target-demonstration rank " in storage, wherein, described key element is meant a dvielement of the same nature that will express, such as: road key element, water system key element, point of interest key element etc.; Described target is meant the simplest element, such as: a point of interest (the Water Cube), a greenery patches (certain park at an intersection), a road etc., the target of can being known as; Described demonstration rank then is the degree of concern that is subjected to that is used for representing a certain target, and the demonstration rank of this target is high more, and it is subjected to attention rate (principal characteristic) also just high more.The demonstration rank of each target is prior setting, and the user can regulate according to the demand of oneself.
Shown in Fig. 5-6, the invention also discloses a kind of display packing based on aforementioned map of navigation electronic date storage method, it is characterized in that described display packing comprises the steps:
A) obtain indication range by screen cursor;
B) determine engineer's scale according to described indication range, described engineer's scale is to determine according to the indication range of determining, shows that as need national figure will show under small scale, and shows that as needing block and house in the city will show under large scale;
C) determine the included map sheet of this indication range under described engineer's scale;
D) data of above-mentioned map sheet being read in viewing area, foreground internal memory shows;
E) data that have a fraternal map sheet of neighbouring relations with above-mentioned map sheet in the map sheet node tree are read in background memory buffer zone (being the virtual memory buffer zone).
Further, when the user moves display window, described electronic navigation system can directly move into the viewing area, foreground with the data of reading in back buffer district (being the virtual memory buffer zone), and shows, returns step e afterwards again.
Described step C further comprises step:
C1) determine to want the position of data presented in storage medium according to the engineer's scale of having determined, promptly be stored in which accumulation layer;
C2) determine the included map sheet of this indication range under described engineer's scale according to the indication range of having determined again;
Further, when the determined accumulation layer of step C1 shows rank to two or more benchmark should be arranged, described electronic navigation apparatus will be given tacit consent to all data contents (all targets) that show in the corresponding map sheet, just show that according to lower benchmark rank shows, this electronic navigation apparatus can be pointed out the user further enlarged map and the higher a part of data content (promptly showing a part of target that rank is higher) of demonstration rank simultaneously.If the user wishes enlarged map, then described electronic navigation apparatus is deleted according to benchmark demonstration rank higher in this accumulation layer and is shown the relatively low a part of target of rank in the map that has shown.
In a preferred embodiment of the present invention,, when this cartographic information of storage, three different engineer's scales have been selected: 1: 5000,1: 20000 and 1: 50000 with the electronic map information of Beijing as required demonstration.After obtaining indication range by screen cursor, determine that the displaying ratio chi is 1: 5000 a atlas, this engineer's scale is that 1: 5000 atlas is split into m map sheet, being numbered of map sheet tubercle: 1,2, ... m, determine that according to this indication range the included map sheet of this indication range is that (map sheet between the k＜m) is read in viewing area, foreground internal memory with the data of above-mentioned map sheet and shown at 1-k for the numbering of map sheet tubercle again; By table 1, so 2 illustrate, engineer's scale be 1: 5000 atlas be stored in the storage 0 layer in, the pairing benchmark of this layer shows that rank is 0 or 1, because can giving tacit consent to according to lower benchmark, described electronic navigation apparatus shows that rank shows, so the benchmark of device acquiescence shows that rank is 0, and when benchmark shows rank 0, represent that then described electronic navigation apparatus will show that all show that ranks are more than or equal to 0 target, so described electronic navigation apparatus acquiescence shows all data contents in the corresponding map sheet, this electronic navigation apparatus can be pointed out the user further enlarged map and demonstration rank are 1 data content (promptly showing a part of target that rank is higher) simultaneously.If this moment, the user wished enlarged map, then described electronic navigation apparatus will be deleted and show in the map that has shown that rank is a part of target of 0 (showing that rank is less than 1).Described electronic navigation apparatus is further according to represented neighbouring relations in the map sheet node tree, the fraternal map sheet that definite and above-mentioned 1-k map sheet is neighbouring relations is k+1-k+n (k＜m, number map sheet of n＜m), above-mentioned map sheet data are read in background memory buffer zone (being the virtual memory buffer zone), when the user moves display window, described electronic navigation system can directly move into the viewing area, foreground with the data of reading in background memory buffer zone (being the virtual memory buffer zone), and show, again the data that have a fraternal map sheet of neighbouring relations with above-mentioned map sheet in the map sheet node tree are read in background memory buffer zone (being the virtual memory buffer zone).
And if determined in the above-described embodiments displaying ratio chi is 1: 20000, display packing and before displaying ratio chi are that 1: 5000 o'clock display packing is consistent.But, because the displaying ratio chi diminishes, by table 1, so 2 illustrate, engineer's scale be 1: 20000 atlas be stored in the storage 1 layer in, the pairing benchmark of this layer shows that rank is 2 or 3, because can giving tacit consent to according to lower benchmark, described electronic navigation apparatus shows that rank shows, so the benchmark of device acquiescence shows that rank is 2, and when benchmark shows rank 2, represent that then described electronic navigation apparatus will show that all show that ranks are more than or equal to 2 target, so described electronic navigation apparatus acquiescence shows all data contents in the corresponding map sheet, simultaneously this electronic navigation apparatus can point out the user further enlarged map and demonstration rank more than or equal to 3 data content (promptly showing a part of target that rank is higher).If this moment, the user wished enlarged map, then described electronic navigation apparatus will be deleted and show in the map that has shown that rank is a part of target of 2 (showing that rank is less than 3).
And if determined in the above-described embodiments displaying ratio chi is 1: 640000, display packing is consistent with before display packing.But, because the displaying ratio chi becomes littler, by table 1, so 2 illustrate, engineer's scale be 1: 640000 atlas be stored in the storage 4 layers in, the pairing benchmark of this layer shows that rank is 7 or 8, because can giving tacit consent to according to lower benchmark, described electronic navigation apparatus shows that rank shows, so the benchmark of device acquiescence shows that rank is 7, and when benchmark shows rank 7, represent that then described electronic navigation apparatus will show that all show that ranks are more than or equal to 7 target, so described electronic navigation apparatus acquiescence shows all data contents in the corresponding map sheet, simultaneously this electronic navigation apparatus can point out the user further enlarged map and demonstration rank more than or equal to 8 data content (promptly showing a part of target that rank is higher).If this moment, the user wished enlarged map, then described electronic navigation apparatus will be deleted and show in the map that has shown that rank is a part of target of 7 (showing that rank is less than 8), promptly kept most important geodata, as Tian An-men, the Great Wall at Badaling etc., and other data will be left in the basket.
Though described the present invention by embodiment, those of ordinary skills know, without departing from the spirit and substance in the present invention, just can make the present invention that many distortion and variation are arranged, and scope of the present invention is limited to the appended claims.
Claims (7)
1. the storage means of map of navigation electronic data is characterized in that, the storage means of described storing electronic map data comprises the steps:
1) data in the electronic chart that collects is handled;
2) set of the road data after will handling forms atlas;
3) data creating with described atlas becomes different proportion chi and separate a plurality of data files, and corresponding at least one benchmark of each engineer's scale shows rank;
4), show rank other target deletion of benchmark display level less than correspondence with in described each data file;
5) each described data file is cut apart, be divided into map sheet;
6) setting up with the map sheet is the map sheet node tree of node, complete set membership and neighbouring relations between these all map sheets of map sheet node tree reflection, and described map sheet node tree comprises all map sheets in the different reservoir.
2. storage means as claimed in claim 1, it is characterized in that, described storage means also comprises: set up the medium control documents in storage medium, be used to manage storage all map data files on medium, described medium control documents comprises Media Description record, accumulation layer table, atlas table and map sheet node tree, wherein: in described accumulation layer table, the corresponding engineer's scale of each accumulation layer has also write down the map sheet node encoding array and the atlas coding array that comprise in each accumulation layer; Described atlas table is used for each atlas number-mark, described atlas encoded recording included map sheet node encoding array.
3. the display packing based on aforementioned map of navigation electronic date storage method is characterized in that, described display packing comprises the steps:
A) obtain indication range by screen cursor;
B) determine engineer's scale according to described indication range;
C) determine the included map sheet of this indication range under described engineer's scale;
D) data of map sheet being read in viewing area, foreground internal memory shows;
E) data that have a fraternal map sheet of neighbouring relations with the map sheet that has shown in the map sheet node tree are read in the background memory buffer zone.
4. display packing as claimed in claim 3 is characterized in that described display packing also comprises mobile display window, the data of reading in the back buffer district is directly moved into the viewing area, foreground, and show, returns step e afterwards again.
5. display packing as claimed in claim 4 is characterized in that, described step C further comprises step:
C1) determine data to be shown position in storage medium according to the engineer's scale of having determined, promptly determine the accumulation layer at data place to be shown;
C2) determine the included map sheet of this indication range under described engineer's scale according to the indication range of having determined again.
6. display packing as claimed in claim 5 is characterized in that, when the determined accumulation layer of step C1 shows rank to two or more benchmark should be arranged, described electronic navigation apparatus will be given tacit consent to all data contents that show in the corresponding map sheet.
7. display packing as claimed in claim 6 is characterized in that, described electronic navigation apparatus is enlarged map and the higher a part of data content of demonstration rank further.
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