CN104036688A - Map load based method for dynamically screening electronic map point elements - Google Patents
Map load based method for dynamically screening electronic map point elements Download PDFInfo
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- CN104036688A CN104036688A CN201410230409.2A CN201410230409A CN104036688A CN 104036688 A CN104036688 A CN 104036688A CN 201410230409 A CN201410230409 A CN 201410230409A CN 104036688 A CN104036688 A CN 104036688A
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Abstract
The invention provides a map load based method for dynamically screening electronic map point elements. The map load based method for dynamically screening the electronic map point elements comprises 1, performing mesh dividing on point sets of POI (Point of Information) on a map, wherein the size of meshes is identical; 2, dividing the POI in different types to be in different display levels according to the map purpose; 3, confirming pre-reserved points in an electronic map according to the display levels of the POI and the largest area load under the electronic map scale; 4, screening the point set of reserved POI of every mesh and achieving screening of the electronic map point elements. According to the map load based method for dynamically screening the electronic map point elements, the reserved point elements can display the information amount of the point elements in the map maximally, meanwhile mutual covering is avoided, and accordingly cognitive difficulties caused by too much or too little map information amount are avoided.
Description
Technical field
The present invention relates to electronic map technique field, relate in particular to a kind of method of dynamically screening electronic chart point-like key element based on the map amount of loading with.
Background technology
The reading of electronic chart is mainly the process of " seeing ", and vision plays key effect therein.When electronic chart is filled by excessive details, while surpassing people's visual discrimination and understandability, the thus obtained information of people can reduce and is even tending towards 0.In contrast, if quantity of information is too small in map, people also cannot obtain effective information from map.
In electronic chart shows, the electronic map data under different scale has different the level of details, therefore, when compiling generates electronic map data, carry out Screening Treatment to original map data.Traditional screening technique is generally to divide display level according to point-like key element type, then according to the display level information point POI that screening need retain in each grid statically.Due to the skewness weighing apparatus of point-like key element in zones of different, this static filtering method tends to cause some net region point-like element information not enough, and user cannot obtain enough quantity of information from map.
Summary of the invention
The technical problem to be solved in the present invention, be to provide a kind of method of dynamically screening electronic chart point-like key element based on the map amount of loading with, the point-like key element of the reservation of the method can embody the quantity of information of point-like key element in map to greatest extent, can accomplish gland mutually simultaneously, thereby avoid the too much or cognitive difficulties very few and that cause of Map Information Volume.
The present invention is achieved in that a kind of method of dynamically screening electronic chart point-like key element based on the map amount of loading with, and comprises the steps:
Step 1, the point set of the information point POI on map is carried out to grid division, each sizing grid is identical;
Step 2, use according to the map, be divided into different display levels dissimilar information point POI;
Step 3, according to the maximum area amount of loading with under the display level of each information point POI and electronic chart engineer's scale, determine in electronic chart pre-retention point;
Step 4, screen the point set of the information point POI that each grid retains, thereby complete the screening to electronic chart point-like key element.
Further, described step 3 is specially:
The maximum area amount of the loading with MapLoad of step 31, setting grid
max;
Step 32, according to the display level of each information point POI, obtain in grid comprise each information point POI the son amount of loading with MapLoad
i, wherein i is subscript value i=0,1,2,3...n; N is natural number, and from 0 to n, POI
idisplay level successively decreases successively, described MapLoad
i=information point POI
ielectronic chart in mark area/single grid total area;
Step 33, each information point POI is screened, if MapLoad
0<MapLoad
maxtime, continue to calculate the information point POI of next display level, until work as
till; Subscript sequence number be 0～information point POI (j-1) is pre-retention point, subscript sequence number j≤n; If MapLoad
0=MapLoad
maxtime, calculating and end, the information point POI that sequence number is 0 is pre-retention point; If MapLoad
0>MapLoad
maxtime, continue to calculate the information point POI of next display level, until work as
in time, calculate to end, subscript sequence number j≤n, and sequence number is that the POI of k～(j-1) is primary screening retention point.
Further, described step 4 is specially: using the information point POI that in primary screening retention point in grid, display level is the highest as pre-retention point, then judge whether the distance of the retention point of this point and this grid and periphery grid is less than the distance d of restriction, and the distance d of described restriction is predefined threshold value;
That the point of judgement, as the definite retention point of this dot grid, continues to judge whether the distance of the point that primary screening retention point centralized displaying grade is taken second place is less than the distance d of restriction, repeats deterministic process;
No, screen out ungratified information point POI, choose point that in primary screening retention point, display level takes second place as pre-retention point, re-start judgement, until find distance to be a little less than the retention point of the distance d of restriction;
If be not all less than the point of the distance d of restriction in primary screening retention point, return to step 3 and re-start calculating, until filter out, meet the map amount of loading with simultaneously, and be less than the reservation point set of the distance d of restriction.
Tool of the present invention has the following advantages: the map amount of loading with in the present invention is to weigh the how many numerical indicant of map content, and the present invention carrys out dynamic filter information point POI by the reference area amount of loading with parameter; By controlling the map amount of loading with, can guarantee map to be shown under the prerequisite of information visual discrimination and understandability not affecting user, on map for user provides geography information to greatest extent.
Accompanying drawing explanation
Fig. 1 is the inventive method schematic flow sheet.
Fig. 2 is the structural representation of electronic chart of the present invention after pre-retention point in determining electronic chart.
Fig. 3 is the structural representation of the electronic chart of the present invention information point that each grid retains after screening.
Embodiment
Please participate in shown in Fig. 1, a kind of method of dynamically screening electronic chart point-like key element based on the map amount of loading with of the present invention, comprises the steps:
Step 1, the point set of the information point POI on map is carried out to grid division (size of mesh opening under different scale varies in size), each sizing grid is identical;
Step 2, use according to the map, be divided into different display levels dissimilar information point POI; For example: display level is as shown in table 1
| display level | pOI classification |
| 1 | country capital, provincial administrative center |
| 2 | administration center, district level administrative center |
| 3 | mountain range, island |
| .。。 | 。。。 |
Table 1
Step 3, according to the maximum area amount of loading with under the display level of each information point POI and electronic chart engineer's scale, determine in electronic chart pre-retention point;
Described step 3 is specially:
The maximum area amount of the loading with MapLoad of step 31, setting grid
max;
Step 32, according to the display level of each information point POI, obtain in grid comprise each information point POI the son amount of loading with MapLoad
i, wherein i is subscript value i=0,1,2,3...n; N be natural number (from 0 to n, POI
idisplay level successively decreases successively), described MapLoad
i=information point POI
ielectronic chart in mark area/single grid total area;
Step 33, each information point POI is screened, if MapLoad
0<MapLoad
maxtime, continue to calculate the information point POI of next display level, until work as
till; Subscript sequence number be 0～information point POI (j-1) is pre-retention point, subscript sequence number j≤n; If MapLoad
0=MapLoad
maxtime, calculating and end, the information point POI that sequence number is 0 is pre-retention point; If MapLoad
0>MapLoad
maxtime, continue to calculate the information point POI of next display level, until work as
in time, calculate to end, subscript sequence number j≤n, and sequence number is that the POI of k～(j-1) is primary screening retention point.
Step 4, screen the point set of the information point POI that each grid retains, thereby complete the screening to electronic chart point-like key element.
Described step 4 is specially: using the information point POI that in primary screening retention point in grid, display level is the highest as pre-retention point, then judge whether the distance of the retention point of this point and this grid and periphery grid is less than the distance d of restriction, and the distance d of described restriction is predefined threshold value;
That the point of judgement, as the definite retention point of this dot grid, continues to judge whether the distance of the point that primary screening retention point centralized displaying grade is taken second place is less than the distance d of restriction, repeats deterministic process;
No, screen out ungratified information point POI, choose point that in primary screening retention point, display level takes second place as pre-retention point, re-start judgement, until find distance to be a little less than the retention point of the distance d of restriction;
If be not all less than the point of the distance d of restriction in primary screening retention point, return to step 3 and re-start calculating, until filter out, meet the map amount of loading with simultaneously, and be less than the reservation point set of the distance d of restriction.
Consult shown in Fig. 2 and Fig. 3, below in conjunction with an instantiation, the present invention will be further described:
The point set of information point POI on map is carried out to grid division;
Use, is divided into different display levels dissimilar information point POI according to the map;
If a grid under certain engineer's scale is numbered 483,831,005 region, according to the maximum area amount of the loading with MapLoad of grid
max, the result after described step 3 screening as shown in Figure 2;
Enter described step 4 and do further screening, from Fig. 2, can find out,
A. retain in advance POI (" Red Star safe and civilized living quarter ") display level compared with POI (" believing that abundant tea is capable ") height, but the two does not meet minimum distance limit, mark and cause having conflict to produce, now POI (" believing that abundant tea is capable ") will be screened out.
B. retain in advance POI (" bright note Chenghai halogen goose ") and adjacent mesh and determined that some POI (" Long Shanqiao ") does not meet minimum distance limit and causes mark to have conflict, now will screen out POI (" bright note Chenghai halogen goose ").
Through after the screening out of step 4, this grid will occur
situation, in order to retain more point of interest in this grid, reflect more geography information, return to step 3, again according to the maximum area amount of loading with MapLoad
maxdetermine pre-retention point, through step 3, pre-retention point result can be found out as Fig. 3: Fig. 3, near the POI screening last time, increased POI (" six society's flesh of fish food markets ") and POI (" husky pot congee "), guaranteed that the POI on original grid enriches degree and quantity of information.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (3)
1. based on the map amount of loading with, dynamically screen a method for electronic chart point-like key element, it is characterized in that, comprise the steps:
Step 1, the point set of the information point POI on map is carried out to grid division, each sizing grid is identical;
Step 2, use according to the map, be divided into different display levels dissimilar information point POI;
Step 3, according to the maximum area amount of loading with under the display level of each information point POI and electronic chart engineer's scale, determine in electronic chart pre-retention point;
Step 4, screen the point set of the information point POI that each grid retains, thereby complete the screening to electronic chart point-like key element.
2. method of dynamically screening electronic chart point-like key element based on the map amount of loading with according to claim 1, is characterized in that: described step 3 is specially:
The maximum area amount of the loading with MapLoad of step 31, setting grid
max;
Step 32, according to the display level of each information point POI, obtain in grid comprise each information point POI the son amount of loading with MapLoad
i, wherein i is subscript value i=0,1,2,3...n; N is natural number and from 0 to n, POI
idisplay level successively decreases successively, described MapLoad
i=information point POI
ielectronic chart in mark area/single grid total area;
Step 33, each information point POI is screened, if MapLoad
0<MapLoad
maxtime, continue to calculate the information point POI of next display level, until work as
till; Subscript sequence number be 0～information point POI (j-1) is pre-retention point, subscript sequence number j≤n; If MapLoad
0=MapLoad
maxtime, calculating and end, the information point POI that sequence number is 0 is pre-retention point; If MapLoad
0>MapLoad
maxtime, continue to calculate the information point POI of next display level, until work as
in time, calculate to end, subscript sequence number j≤n, and sequence number is that the POI of k～(j-1) is primary screening retention point.
3. method of dynamically screening electronic chart point-like key element based on the map amount of loading with according to claim 1 and 2, it is characterized in that: described step 4 is specially: using the information point POI that in primary screening retention point in grid, display level is the highest as pre-retention point, then judge whether the distance of the retention point of this point and this grid and periphery grid is less than the distance d of restriction, and the distance d of described restriction is predefined threshold value;
That the point of judgement, as the definite retention point of this dot grid, continues to judge whether the distance of the point that primary screening retention point centralized displaying grade is taken second place is less than the distance d of restriction, repeats deterministic process;
No, screen out ungratified information point POI, choose point that in primary screening retention point, display level takes second place as pre-retention point, re-start judgement, until find distance to be a little less than the retention point of the distance d of restriction;
If be not all less than the point of the distance d of restriction in primary screening retention point, return to step 3 and re-start calculating, until filter out, meet the map amount of loading with simultaneously, and be less than the reservation point set of the distance d of restriction.
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|---|---|---|---|
| CN201410230409.2A CN104036688B (en) | 2014-05-27 | 2014-05-27 | The method for screening electronic map Point element based on the map amount of loading with dynamic |
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|---|---|---|---|
| CN201410230409.2A CN104036688B (en) | 2014-05-27 | 2014-05-27 | The method for screening electronic map Point element based on the map amount of loading with dynamic |
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| CN104036688B CN104036688B (en) | 2019-05-14 |
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Cited By (7)
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| CN104361002A (en) * | 2014-09-29 | 2015-02-18 | 中国科学院国家天文台 | Method and device for configuring fixed spotty thematic symbols on network map |
| CN104915401A (en) * | 2015-05-29 | 2015-09-16 | 广州杰赛科技股份有限公司 | GIS (gheographic information system) information updating method and system |
| CN107480175A (en) * | 2017-06-30 | 2017-12-15 | 广州数鹏通科技有限公司 | A kind of geographic information data screening technique, electronic equipment, storage medium and system based on gridding |
| CN108334624A (en) * | 2018-02-09 | 2018-07-27 | 城市生活（北京）资讯有限公司 | A kind of POI identification processing methods and device |
| CN109036096A (en) * | 2017-06-08 | 2018-12-18 | 腾讯科技（深圳）有限公司 | A kind of map is slotting along the line to put a control method and device |
| CN112395310A (en) * | 2020-12-02 | 2021-02-23 | 武汉光庭信息技术股份有限公司 | Method and system for converging background points of electronic map |
| WO2021189755A1 (en) * | 2020-03-24 | 2021-09-30 | 厦门雅迅网络股份有限公司 | Slope point screening method, terminal device, medium and slope calculation method and system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104361002A (en) * | 2014-09-29 | 2015-02-18 | 中国科学院国家天文台 | Method and device for configuring fixed spotty thematic symbols on network map |
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| CN109036096A (en) * | 2017-06-08 | 2018-12-18 | 腾讯科技（深圳）有限公司 | A kind of map is slotting along the line to put a control method and device |
| CN107480175A (en) * | 2017-06-30 | 2017-12-15 | 广州数鹏通科技有限公司 | A kind of geographic information data screening technique, electronic equipment, storage medium and system based on gridding |
| CN108334624A (en) * | 2018-02-09 | 2018-07-27 | 城市生活（北京）资讯有限公司 | A kind of POI identification processing methods and device |
| WO2021189755A1 (en) * | 2020-03-24 | 2021-09-30 | 厦门雅迅网络股份有限公司 | Slope point screening method, terminal device, medium and slope calculation method and system |
| CN112395310A (en) * | 2020-12-02 | 2021-02-23 | 武汉光庭信息技术股份有限公司 | Method and system for converging background points of electronic map |
| CN112395310B (en) * | 2020-12-02 | 2022-06-17 | 武汉光庭信息技术股份有限公司 | Method and system for converging background points of electronic map |
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