CN101493330A - Map vector data vacuating method in network navigation of mobile phone - Google Patents
Map vector data vacuating method in network navigation of mobile phone Download PDFInfo
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Abstract
The invention discloses a method for thinning map vector data in mobile phone network navigation. Aiming at path data and background data in map display data, the method thins the path data and the background data, reduces the number of nodes forming a path object and a background object so as to reduce the capacity of the map vector data, improves reading speed of the data and execution efficiency of programs during reading, and can reduce data flow greatly during data transmission in the mobile phone network navigation.
Description
Technical field
The present invention relates to the vacuate method of map vector data in a kind of mobile phone network navigation.
Technical background
The mobile phone GPS navigation system is divided into two kinds of mobile phone autonomous navigation system and mobile phone network navigation systems now basically.In the mobile phone network navigation system, mobile phone terminal is not preserved all map vector datas, has only when the needs displayed map and just downloads map to center map server request, so map server need be preserved all map vector datas.
Most map datum manufacturer is in the process of carrying out the road vectors data acquisition, it all is the positional information of gathering road by vehicle, generally speaking according to the travel speed of different road grades and vehicle, the interval of gathering GPS information is in 1 to 5 second scope, so one road or a background are made up of a lot of nodes often, and some can be unnecessary in these nodes.
Summary of the invention
The object of the invention provide a kind of in mobile phone network navigation the vacuate method of map vector data, this method is at road data in the map video data and background data, each bar road and each background are carried out vacuate, reduced the node number of forming road object and background object, thereby reduced the capacity of map vector data, in reading process, improved the reading speed and the executing efficiency of data, carried out to significantly reduce data traffic in the map datum transmission course at mobile phone network navigation.
The vacuate method of map vector data in a kind of mobile phone network navigation of the present invention is primarily aimed in the map video data road data and background data and carries out vacuate and handle:
At first, road data and background data in the vacuate object are carried out the division of Performance Level, determine corresponding vacuate value range;
Then, handle, all only the inside minor node of each vacuate object is carried out the vacuate operation, end to end node vacuate not at the position coordinates attribute of road data and background data in each map video data; The data vacuate adopts a little on algorithm to be judged one by one to the distance of line segment, will cast out apart from the point in the value range of vacuate.
Described road data can be divided into expressway, national highway, city expressway, provincial highway, major urban arterial highway, county road, inferior thoroughfare, township highway, the inner highway in township county, ordinary road and non-navigation road from high to low by the Performance Level that shows, background data is divided into river, railway and greenery patches from high to low by the Performance Level that shows; According to different Presentation Function grades, its vacuate degree is inequality in the vacuate process, and the vacuate degree that Performance Level is high is bigger.
Described road data vacuate operating process is, judges at first whether road data needs to carry out the vacuate operational processes, when the node number of road data less than preset value, do not carry out the vacuate operation;
During the operation of beginning vacuate, extraction needs the back end of vacuate, the head and the tail node of these data is connected into straight line, till playing node second from the bottom from the Section Point of this road, obtain the air line distance that these put this straight line respectively, acquisition is apart from maximal value, if should be apart from maximal value during less than the vacuate value range, then in this scope all nodes all vacuate fall, if greater than the vacuate value range, is interim terminal point to produce peaked node apart from maximal value then, starting point and interim terminal point are drawn a straight line, repeat top-operation then, can obtain the back end information behind the vacuate at last.
Described background data vacuate operating process is, judges at first whether background data needs to carry out the vacuate operation, when the area of background data node or background data during less than certain preset value, do not carry out the vacuate operation;
During the operation of beginning vacuate, extraction needs the back end of vacuate, the head and the tail node of these data is connected into straight line, till playing node second from the bottom from the Section Point of this road, obtain the air line distance that these put this straight line respectively, acquisition is apart from maximal value, if should be apart from maximal value during less than the vacuate value range, then in this scope all nodes all be labeled as the node that can be fallen by vacuate (wait judge mark be can not belonged to other background datas by the node that vacuate falls or belong to other background datas but equally be marked as can be fallen by vacuate node the time, could really fall this node vacuate), if apart from maximal value greater than the vacuate value range, be interim terminal point then to produce peaked node, starting point and interim terminal point are drawn a straight line, repeat top-operation then, can obtain the back end information behind the vacuate at last;
When the internal node data of background data are carried out vacuate, need consider the vacuate situation of other background datas of linking to each other, have only when the same section of two continuous background datas can be by vacuate to determine whether vacuate falls this data.
The coordinate of described background data is all according to the sequential storage of a direction.
Under the not serious situation of distortion, the present invention falls unwanted node vacuate in the map video data, can reduce data capacity greatly, can improve the reading speed of data, therefore, in the data transmission procedure of mobile phone network navigation, can significantly reduce data traffic.
Description of drawings
Fig. 1 is map video data road data vacuate signal among the present invention;
Fig. 2 is map video data vacuate process flow diagram among the present invention.
Embodiment
Map vector data vacuate method in a kind of mobile phone network navigation of the present invention is primarily aimed in the map video data road data or background data and carries out vacuate and handle.Specifically comprise following content:
1) the vacuate data is classified
What the map video data needed vacuate in the mobile phone network navigation has road data and a background data, and wherein road data can be divided into 11 kinds in expressway, national highway, city expressway, provincial highway, major urban arterial highway, county road, inferior thoroughfare, township highway, the inner highway in township county, ordinary road and non-navigation road from high to low by the Performance Level that shows; Background data is divided into river data, rds data and 3 grades of greenery patches data from high to low by the Performance Level that shows;
2) principle of vacuate processing
According to road data or the different Presentation Function grade of background data, adopt vacuate in various degree to handle, promptly determine corresponding vacuate value range, the vacuate degree that Performance Level is high can be relatively big;
No matter be that road data or background data are carried out the vacuate operation, all only the inside minor node of each vacuate object is carried out vacuate and handle, the big node of head and the tail is vacuate not;
The coordinate of background data is all according to the sequential storage of a direction;
When the background data in the map video data is carried out the node vacuate, need to consider and the vacuate situation of other background datas that linked to each other by the background data of vacuate, have only same section could determine whether vacuate falls this data during vacuate when two background datas.
3) flow process (as shown in Figure 2) of vacuate operation
At first, judge whether road data or background data need to carry out the vacuate operation, when the node number of road data less than preset value (supposing that this preset value is 3), when the area of background data node or background object during less than certain preset value (supposing that this preset value is 8), need not carry out the vacuate operation.
As shown in Figure 1, during the operation of beginning vacuate, extraction needs the road data node of vacuate, the head and the tail node of this road is connected into straight line, till playing node second from the bottom from the Section Point of this road, obtain the air line distance that these put this straight line respectively, obtain apart from maximal value, if should be apart from maximal value during less than the vacuate value range, then all these nodes all can be deleted; If greater than the vacuate value range, is interim terminal point to produce peaked node apart from maximal value then, starting point and interim terminal point are drawn a straight line, repeat top-operation then, can obtain the road nodal information behind the vacuate at last.
The vacuate method of background data vacuate and road data is close, just when background data is carried out vacuate, need consider and the vacuate situation of other background datas that linked to each other by the background data of vacuate, have only same section could determine whether vacuate falls this data during vacuate when two background datas.
At two continuous background A and B, the partial L that they link to each other is a broken line, that is to say that L had both belonged to background A, belonged to background B again; When background A was carried out vacuate, a certain node P on the L can be fallen by vacuate, but when background B was carried out vacuate, the node P on the L did not but allow to be fallen by vacuate, and at this time the node P on the L can not be by vacuate.
Described vacuate value range is meant a specific distance, if ultimate range is within this value range, then expression can be by vacuate, the size of this value need be decided on actual conditions, if it is bigger than normal that this value range is provided with, can cause then can't well being solved the data volume redundancy issue on the contrary, also just can not reach the vacuate effect by serious distortion when showing of vacuate object.
Under the normal condition as long as determine the vacuate value range according to the rank of object, will be greatly such as the vacuate value range (being made as 8m) of highway than the vacuate value range (being made as 3m) of ordinary road.
The above only is preferred embodiment of the present invention, does not limit scope of the invention process with this, and the equivalence of doing according to technical scheme of the present invention and description changes and modification, all should belong to the scope that the present invention is contained.
Claims (5)
1, the vacuate method of map vector data in a kind of mobile phone network navigation, the road data and the background data that it is characterized in that being primarily aimed in the map video data carry out the vacuate processing:
At first, road data and background data in the vacuate object are carried out the division of Performance Level, determine corresponding vacuate value range;
Then, handle, all only the inside minor node of each vacuate object is carried out the vacuate operation, end to end node vacuate not at the position attribution of road data and background data in each map video data; The data vacuate adopts a little on algorithm to be judged one by one to the distance of line segment, will cast out apart from the point in the value range of vacuate.
2, the vacuate method of map vector data in a kind of mobile phone network navigation according to claim 1, it is characterized in that: described road data can be divided into expressway, national highway, city expressway, provincial highway, major urban arterial highway, county road, inferior thoroughfare, township highway, the inner highway in township county, ordinary road and non-navigation road from high to low by the Performance Level that shows, background data is divided into river, railway and greenery patches from high to low by the Performance Level that shows; According to different Presentation Function grades, its vacuate degree is inequality in the vacuate process, and the vacuate degree that Performance Level is high is bigger.
3, the vacuate method of map vector data in a kind of mobile phone network navigation according to claim 1, it is characterized in that: described road data vacuate operating process is, judge at first whether road data needs to carry out the vacuate operation, when the node number of road data less than preset value, do not carry out the vacuate operation;
During the operation of beginning vacuate, extraction needs the back end of vacuate, the head and the tail node of these data is connected into straight line, till playing node second from the bottom from the Section Point of this road, obtain the air line distance that these put this straight line respectively, acquisition is apart from maximal value, if should be apart from maximal value during less than the vacuate value range, then in this scope all nodes all vacuate fall, if greater than the vacuate value range, is interim terminal point to produce peaked node apart from maximal value then, starting point and interim terminal point are drawn a straight line, repeat top-operation then, can obtain the back end information behind the vacuate at last.
4, the vacuate method of map vector data in a kind of mobile phone network navigation according to claim 1, it is characterized in that: described background data vacuate operating process is, judge at first whether background data needs to carry out the vacuate operation, when the area of background data node or background data during, do not carry out the vacuate operation less than certain preset value;
During the operation of beginning vacuate, extraction needs the back end of vacuate, the head and the tail node of these data is connected into straight line, till playing node second from the bottom from the Section Point of this road, obtain the air line distance that these put this straight line respectively, acquisition is apart from maximal value, if should be apart from maximal value during less than the vacuate value range, then all nodes all are labeled as the node that can be fallen by vacuate in this scope, promptly wait judge mark for can not belonged to other background datas by the node that vacuate falls or belong to other background datas but equally be marked as can be fallen by vacuate node the time, could really fall this node vacuate, if greater than the vacuate value range, is interim terminal point to produce peaked node apart from maximal value then, starting point and interim terminal point are drawn a straight line, repeat top-operation then, can obtain the back end information behind the vacuate at last;
When the internal node data of background data are carried out vacuate, need consider the vacuate situation of other background datas of linking to each other, have only when the same section of two continuous background datas can be by vacuate to determine whether vacuate falls this data.
5, the vacuate method of map vector data in a kind of mobile phone network navigation according to claim 1 is characterized in that: the coordinate of described background data is all according to the sequential storage of a direction.
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