CN104933953A - Method and device for improving precision of map display - Google Patents
Method and device for improving precision of map display Download PDFInfo
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- CN104933953A CN104933953A CN201410097723.8A CN201410097723A CN104933953A CN 104933953 A CN104933953 A CN 104933953A CN 201410097723 A CN201410097723 A CN 201410097723A CN 104933953 A CN104933953 A CN 104933953A
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- map
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- reference point
- distance
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Abstract
The invention discloses a method for improving the precision of map display, and the method comprises the steps: randomly selecting one point as an adjustment point, and determining the coordinates of the adjustment point in all maps; determining M reference points, and determining the coordinates of the M reference points in all maps; respectively calculating the distances between the adjustment point and the M reference points in all maps; calculating the weighted mean values of the distances between the adjustment point and the same reference point in all maps, and adjusting the displacement of the adjustment point in all maps according to the weighted mean values. The invention also discloses a device for improving the precision of map display.
Description
Technical field
The present invention relates to the deviation correcting technology in map denotation process, particularly relate to a kind of method and the device that improve map denotation precision.
Background technology
According to relevant laws and regulations, generally when issuing civilian map product, consider not allow to use true coordinate for national security, must add certain deviation, this skew is realized by the secret plug-in unit of national Mapping departments, can't affect the use of user.Here, described secret plug-in unit, is also called encryption plug-in unit or adds inclined plug-in unit, that people is carried out for adding inclined process to true coordinate system, real coordinate is encrypted to false coordinate according to special algorithm, described in add be not linearly add partially, so the drift condition of various places is different partially.All electronic charts and all navigator, all need to add secret plug-in unit.
Because the earth is irregular spheroid, therefore, the coordinate system in Geographic Information System (Geographic InformationSystem or Geo-Information system, GIS) is determined by reference field and map projection two groups of parameters; Described reference field is determined by specific spheroid and the conversion parameter corresponding with described specific spheroid.Because reference field is described specific spheroid approaching particular locality earth surface, therefore, all there is respective reference field each country, that is, when drawing the map in country variant or area, can adopt the coordinate system corresponding to different reference field.Such as, what the part in Google Maps except Chinese scope all adopted is WGS84 geographic coordinate system, what the map of China in Google Maps and the map of China searched in map all adopted is GCJ02 geographic coordinate system, and Baidu's map employing is BD09 geographic coordinate system.
But, GPS (Global Positioning System in station acquisition equipment, what adopt when GPS) chip or Big Dipper chip obtain longitude and latitude is WGS84 geographic coordinate system, and the national geography general bureau of surveying and mapping requires that the map published adopts GCJ02 coordinate system instead of WGS84 geographic coordinate system, add secret plug-in unit to buy property raw interference to map meta, the longitude of the physical location causing station acquisition equipment to collect and latitude, relatively large deviation is had with corresponding to the position in the map published, therefore, need various map as Google Maps, Tengxun is searched, Baidu's map, Google Maps and mixing map etc. carry out correction process, to improve map denotation precision.
In prior art, usually adopt the method for comparison to rectify a deviation to map, to rectify a deviation to Baidu's map, the method for described comparison is specially: the earth is divided into several zonules, adopts GPS to determine the side-play amount of each zonule in Baidu's map; When rectifying a deviation to the coordinate in each zonule in Baidu's map, first determine the side-play amount that each zonule is corresponding, adding corresponding on the coordinate basis in each zonule the side-play amount that each zonule is corresponding, thus determining relatively accurate coordinate information.
But existing correction information is also imperfect, does not contain each region; Therefore, in the region that correction information is incomplete, can not rectify a deviation, make the coordinate points in map and physical location there is relatively large deviation.
Summary of the invention
For solving the technical matters of existing existence, embodiments providing a kind of method and the device that improve map denotation precision, multiple maps can be utilized to rectify a deviation to the coordinate in map, to improve map denotation precision.
Technical scheme of the present invention is achieved in that
Embodiments provide a kind of method improving map denotation precision, comprising: multiple maps selected; Described method also comprises:
A selected point is as adjustment point arbitrarily, and determines the coordinate of described adjustment point in each map;
Determine M reference point, and determine the coordinate of M reference point in each map;
Calculate the distance between the point of adjustment described in each map and M reference point respectively;
Calculate adjustment point and the weighted mean value of the distance of same reference point in each map, and according to the displacement of weighted mean value adjustment adjustment in each map.
Further, the weighted mean value of described calculating adjustment point and the distance of same reference point in each map, comprising:
The earth is divided into the zonule being at least more than or equal to two, determine to adjust the side-play amount of zonule in each map residing for point according to the correction information prestored, and the side-play amount correspondence corresponding according to same map gives the distance weighting in described same map between adjustment point and M reference point, calculate the weighted mean value of adjustment and the distance of same reference point in each map.
Further, described according to the displacement of weighted mean value adjustment adjustment point in each map, comprising:
With M reference point for the center of circle, to adjust a little corresponding with each distance of same reference point weighted mean value for radius, M circle is determined respectively in each map, and in each map using parts maximum for the common factor of M the circle determined as target area, will the target area adjusted to corresponding to each map of adjustment point.
The embodiment of the present invention additionally provides a kind of device improving map denotation precision, and described device comprises:
Determining unit, for multiple maps selected; Also for selecting arbitrarily a point as adjustment point, and determine the coordinate of described adjustment point in each map; Also for determining M reference point, and determine the coordinate of M reference point in each map;
Computing unit, for calculating the distance between the point of adjustment described in each map and M reference point respectively; Also put the weighted mean value with the distance of same reference point in each map for calculating adjustment;
Adjustment unit, for adjusting the displacement of point in each map according to weighted mean value adjustment.
Further, described computing unit comprises:
Searching subelement, for the earth being divided into the zonule being at least more than or equal to two, determining to adjust the side-play amount of zonule in each map residing for point according to the correction information prestored;
Assignment subelement, gives the distance weighting in described same map between adjustment point and M reference point for the side-play amount correspondence corresponding according to same map;
Computation subunit, puts the weighted mean value with the distance of same reference point in each map for calculating adjustment.
Further, described adjustment unit also comprises:
Determine subelement, for with M reference point for the center of circle, with adjust a little with the weighted mean value corresponding to each distance of same reference point for radius, in each map, determine M circle respectively, and in each map using parts maximum for the common factor of M the circle determined as target area;
Adjustment subelement, for the target area adjusting to adjustment point corresponding to each map.
The embodiment of the present invention improves method and the device of map denotation precision, adjust point, multiple maps by selecting one and select multiple reference point arbitrarily near described adjustment point, and determine described adjustment point and the coordinate points of reference point in each map, pass through coordinate points, determine to adjust the distance between point and multiple reference point in each map, and determine to adjust the weighted mean value put with the distance of same reference point in each map, according to the coordinate position of weighted mean value adjustment adjustment point in each map, so, the display precision of map can be improved.
In addition, because the present invention can determine to adjust the weighted mean value put with the distance of same reference point in each map, and the position of the coordinate points of point in each map is adjusted according to described weighted mean value adjustment, therefore, during for the correction information in region do not stored in existing correction information residing for described adjustment point, adopt the present invention also can improve the display precision of adjustment point in map.
Accompanying drawing explanation
Fig. 1 is the realization flow schematic diagram that the embodiment of the present invention improves the method for map denotation precision;
Fig. 2 is the structural representation that the embodiment of the present invention improves the device of map denotation precision;
Fig. 3 is the structural representation that the embodiment of the present invention improves computing unit in the device of map denotation precision;
Fig. 4 is the structural representation that the embodiment of the present invention improves adjustment unit in the device of map denotation precision.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing, embodiments of the present invention are described in detail.
Fig. 1 is the realization flow schematic diagram that the embodiment of the present invention improves the method for map denotation precision, and as shown in Figure 1, described method comprises:
Step 101: a selected point is as adjustment point arbitrarily, and determine the coordinate of described adjustment point in each map;
Determine adjustment point before, the embodiment of the present invention also comprises: multiple maps of chosen in advance, be called the first map, the second map ..., N map;
Accordingly, describedly determine that the coordinate of described adjustment point in each map comprises: determine described adjustment respectively o'clock at the first map, the second map to the coordinate points in each self-corresponding coordinate system of N map, be designated as A respectively
1, A
2to A
n.
Step 102: determine M reference point, and determine the coordinate of M reference point in each map;
Particularly, describedly determine the coordinate of M reference point in each map, comprising: in the first map, determine that the first reference point, the second reference point are to coordinate points corresponding to M reference point, are designated as B respectively
1, B
2to B
m; In the second map, determine that the first reference point, the second reference point are to coordinate points corresponding to M reference point, are designated as C respectively
1, C
2to C
m; Until, in N map, determine the first reference point, the second reference point, to coordinate points corresponding to M reference point, be designated as M respectively
1, M
2to M
m.
Here, the execution sequence of step 101 and step 102 can be exchanged.
Step 103: calculate the distance between the point of adjustment described in each map and M reference point respectively;
Particularly, calculate the distance between M reference point adjusting described in described first map in point and described first map, total M distance value, is respectively coordinate points A
1with B
1distance L
11, coordinate points A
1with B
2distance L
12to coordinate points A
1with B
mdistance L
1M;
The like, calculate the distance between the described adjustment point in described second map and M reference point in described second map, total M distance value, is respectively coordinate points A
2with C
1distance L
21, coordinate points A
2with C
2distance L
22to coordinate points A
2with C
mdistance L
2M;
Until calculate the distance between the described adjustment point in described N map and M reference point in described N map, total M distance value, is respectively coordinate points A
nwith M
1distance L
n1, coordinate points A
nwith M
2distance L
n2to coordinate points A
nwith M
mdistance L
nM; Therefore, distance value M × N number of distance value altogether.
Step 104: calculate adjustment point and the weighted mean value of the distance of same reference point in each map, and according to the displacement of weighted mean value adjustment adjustment in each map.
Be specially:
Calculate A
1with B
1distance, A
2with C
1distance until A
nwith M
1the weighted mean value of distance altogether N number of distance, namely calculate L
11, L
21and L
n1weighted mean value L
1;
The rest may be inferred, calculates A
1with B
2distance, A
2with C
2distance until A
nwith M
2the weighted mean value of distance altogether N number of distance, namely calculate L
12, L
22and L
n2weighted mean value L
2;
Until, calculate A
1with B
mdistance, A
2with C
mdistance until A
nwith M
mthe weighted mean value of distance altogether N number of distance, namely calculate L
1M, L
2Mand L
nMweighted mean value L
m.
Further, the weighted mean value of described calculating adjustment point and the distance of same reference point in each map, comprising:
The earth is divided into the zonule being at least more than or equal to two, determine to adjust the side-play amount of zonule in each map residing for point according to the correction information prestored, and the side-play amount correspondence corresponding according to same map gives the distance weighting in described same map between adjustment point and M reference point, calculate the weighted mean value of adjustment and the distance of same reference point in each map.
Accordingly, the weighted mean value of described calculating adjustment point and the distance of same reference point in each map, comprising:
Suppose to determine the described offset X of zonule in the first map adjusted residing for point according to the correction information prestored
1, suppose to determine the described offset X of zonule in the second map adjusted residing for point according to the correction information prestored
2, until hypothesis determines the offset X of zonule in N map residing for described adjustment point according to the correction information prestored
n; Then the described side-play amount corresponding according to same map correspondence gives the distance weighting in described same map between adjustment point and M reference point, is specially:
According to the offset X in the first map
1give L
11, L
12and L
1Mweight; According to the offset X in the second map
2give L
21, L
22and L
2Mweight; Then according to the offset X in N map
ngive L
n1, L
n2and L
nMweight.
Accordingly, calculate adjustment point and the weighted mean value of the distance of same reference point in each map, be specially:
According to weight, calculate L
11, L
21and L
n1weighted mean value L
1; Calculate L
12, L
22and L
n2weighted mean value L
2; Until, calculate L
1M, L
2Mand L
nMweighted mean value L
m.
Here, the value of described weight is more than or equal to 1, is less than or equal to zero; The size of described weight is determined according to side-play amount; Described weight is empirical value;
Such as, in selected N number of map, the described side-play amount adjusting the zonule of point residing for N number of map corresponding all can arrive in the correction information inquiry prestored, and now, the whole assignment of weight is 1, that is, the weighted mean value calculated is mathematical mean; Particularly, distance L is given
11, L
21and L
n1weight is 1, then weighted mean value L
1for L
11, L
21and L
n1mathematical mean;
The side-play amount corresponding when the zonule that adjustment point is residing in certain map is not stored in the correction information prestored, namely the side-play amount that adjustment point zonule residing in certain map is corresponding is not stored in existing correction information bank, now, weight assignment is less, is even 0; And when storing side-play amount corresponding to adjustment point zonule residing in certain map in existing correction information bank, now weight assignment is larger;
When described adjustment point is not all stored in the correction information prestored in the side-play amount that the zonule residing for N number of map is corresponding, now, the whole assignment of weight is 1, that is, the weighted mean value calculated is mathematical mean; Particularly, distance L is given
11, L
21and L
n1weight is 1, then weighted mean value L
1for L
11, L
21and L
n1mathematical mean.
Be specially, when do not store in existing correction information bank adjustment point in the first map residing for side-play amount corresponding to zonule, then the distance value L in the first map
11, L
12and L
1Mweight assignment less, be even 0; And when store in existing correction information bank adjustment point in the first map residing for side-play amount corresponding to zonule, then the distance L in the first map
11, L
12and L
1Mweight assignment larger.
Further, described according to the displacement of weighted mean value adjustment adjustment point in each map, comprising:
With M reference point for the center of circle, to adjust a little corresponding with each distance of same reference point weighted mean value for radius, M circle is determined respectively in each map, and in each map using parts maximum for the common factor of M the circle determined as target area, will the target area adjusted to corresponding to each map of adjustment point.
Specifically comprise:
In the first map, with B
1for the center of circle, with weighted mean value L
1for radius, determine circle; With B
2for the center of circle, with weighted mean value L
2for radius, determine circle; Until, with B
mfor the center of circle, with weighted mean value L
mfor radius, determine circle; Therefore, in the first map, determine M circle altogether, M the circle determined is occured simultaneously maximum parts as first object region, by adjustment point A
1adjust to described first object region, improve the display precision of the first map;
The rest may be inferred, in the second map, with C
1for the center of circle, with weighted mean value L
1for radius, determine circle; With C
2for the center of circle, with weighted mean value L
2for radius, determine circle; Until, with C
mfor the center of circle, with weighted mean value L
mfor radius, determine circle; Therefore, in the second map, determine M circle altogether, M the circle determined is occured simultaneously maximum parts as the second target area, by adjustment point A
2adjust to described second target area, improve the display precision of the second map;
Until, in N map, with M
1for the center of circle, with weighted mean value L
1for radius, determine circle; With M
2for the center of circle, with weighted mean value L
2for radius, determine circle; Until, with M
mfor the center of circle, with weighted mean value L
mfor radius, determine circle; Therefore, in N map, determine M circle altogether, M the circle determined is occured simultaneously maximum parts as N target area, by adjustment point A
nadjust to described N target area, improve the display precision of N map.
The embodiment of the present invention additionally provides a kind of device corresponding to the raising map denotation precision of said method, and as shown in Figure 2, described device comprises:
Determining unit 21, for multiple maps selected; Also for selecting arbitrarily a point as adjustment point, and determine the coordinate of described adjustment point in each map; Also for determining M reference point, and determine the coordinate of M reference point in each map;
Computing unit 22, for calculating the distance between the point of adjustment described in each map and M reference point respectively; Also put the weighted mean value with the distance of same reference point in each map for calculating adjustment;
Adjustment unit 23, for adjusting the displacement of point in each map according to weighted mean value adjustment.
Further, as shown in Figure 3, described computing unit 22 comprises:
Searching subelement 221, for the earth being divided into the zonule being at least more than or equal to two, determining to adjust the side-play amount of zonule in each map residing for point according to the correction information prestored;
Assignment subelement 222, gives the distance weighting in described same map between adjustment point and M reference point for the side-play amount correspondence corresponding according to same map;
Computation subunit 223, puts the weighted mean value with the distance of same reference point in each map for calculating adjustment.
Further, as shown in Figure 4, described adjustment unit 23 also comprises:
Determine subelement 231, for with M reference point for the center of circle, with adjust a little with the weighted mean value corresponding to each distance of same reference point for radius, in each map, determine M circle respectively, and in each map using parts maximum for the common factor of M the circle determined as target area;
Adjustment subelement 232, for the target area adjusting to adjustment point corresponding to each map.
Here, in real process, the coordinate points in existing any map can be selected to be regulating object, so adopt the inventive method can improve the display precision of any map; In addition, because adjustment point can be any point at random in figure, employing the present invention also can improve the display precision of whole map.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (6)
1. improve a method for map denotation precision, it is characterized in that, multiple maps selected; Described method also comprises:
A selected point is as adjustment point arbitrarily, and determines the coordinate of described adjustment point in each map;
Determine M reference point, and determine the coordinate of M reference point in each map;
Calculate the distance between the point of adjustment described in each map and M reference point respectively;
Calculate adjustment point and the weighted mean value of the distance of same reference point in each map, and according to the displacement of weighted mean value adjustment adjustment in each map.
2. method according to claim 1, is characterized in that, the weighted mean value of described calculating adjustment point and the distance of same reference point in each map, comprising:
The earth is divided into the zonule being at least more than or equal to two, determine to adjust the side-play amount of zonule in each map residing for point according to the correction information prestored, and the side-play amount correspondence corresponding according to same map gives the distance weighting in described same map between adjustment point and M reference point, calculate the weighted mean value of adjustment and the distance of same reference point in each map.
3. method according to claim 1, is characterized in that, described according to the displacement of weighted mean value adjustment adjustment point in each map, comprising:
With M reference point for the center of circle, to adjust a little corresponding with each distance of same reference point weighted mean value for radius, M circle is determined respectively in each map, and in each map using parts maximum for the common factor of M the circle determined as target area, will the target area adjusted to corresponding to each map of adjustment point.
4. improve a device for map denotation precision, it is characterized in that, described device comprises:
Determining unit, for multiple maps selected; Also for selecting arbitrarily a point as adjustment point, and determine the coordinate of described adjustment point in each map; Also for determining M reference point, and determine the coordinate of M reference point in each map;
Computing unit, for calculating the distance between the point of adjustment described in each map and M reference point respectively; Also put the weighted mean value with the distance of same reference point in each map for calculating adjustment;
Adjustment unit, for adjusting the displacement of point in each map according to weighted mean value adjustment.
5. device according to claim 4, is characterized in that, described computing unit comprises:
Searching subelement, for the earth being divided into the zonule being at least more than or equal to two, determining to adjust the side-play amount of zonule in each map residing for point according to the correction information prestored;
Assignment subelement, gives the distance weighting in described same map between adjustment point and M reference point for the side-play amount correspondence corresponding according to same map;
Computation subunit, puts the weighted mean value with the distance of same reference point in each map for calculating adjustment.
6. device according to claim 4, is characterized in that, described adjustment unit also comprises:
Determine subelement, for with M reference point for the center of circle, with adjust a little with the weighted mean value corresponding to each distance of same reference point for radius, in each map, determine M circle respectively, and in each map using parts maximum for the common factor of M the circle determined as target area;
Adjustment subelement, for the target area adjusting to adjustment point corresponding to each map.
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