CN102768041B - Intelligent directional mileage sign and method for implementing coordinate transformation - Google Patents

Abstract

The invention provides an intelligent directional mileage sign and a method for implementing coordinate transformation, and belongs to the field of measurement and positioning. The intelligent directional mileage sign is arranged beside a house number of urban equipment without changing the house number or arranged in mobile urban equipment, and comprises a longitude and latitude coordinate acquisition device, a coordinate transformation device and a display device; the longitude and latitude coordinate acquisition device is used for acquiring longitude and latitude coordinates of the urban equipment; the coordinate transformation device is used for transforming the longitude and latitude coordinates of the urban equipment into directional mileage coordinates of the urban equipment; the display device is used for displaying the directional mileage coordinates of the urban equipment; and the directional mileage coordinates are two-dimensional coordinates. By using the intelligent directional mileage sign, the house number is not required to be changed, the house number or a building number is conveniently, quickly and accurately searched, and the technical problems about 'convenient house number search and convenient road name search' which are expected to be solved but not succeed all the time are solved.

Description

A kind of intelligent directional mileage sign and realize the method for coordinate conversion

Technical field

The invention belongs to measurement and positioning field, be specifically related to a kind of intelligent directional mileage sign and realize the method for coordinate conversion, for searching number easily.

Background technology

Railway, highway are lines, show place on line with mileometer, " XX+XXX ", and "+" is front is km, is m after "+", for its equipment control along the line brings convenience.As everyone knows, city house number is made up of road name and serial number, and building plate is made up of cell name and serial number, and all numbers are all serial numbers from 1, does not see position and distance, is inconvenient to very much search.And after road name, cell name change, number, building plate just should be revised, but this amendment is sometimes the amendment not catching up with the former.In addition, urban road is represented by single road name, does not see position and the trend of road, conveniently search number at present, artificially a road is divided into a lot of section, a road has a lot of road name, further increase the difficulty that people search road name like this.

The easy-to-look-up people of being of number thirst for solving always but fail the technical barrier that succeeds all the time, all the establishment rules by changing number and method at present, solve the easy-to-look-up problem of number, such as, the doorplate of Tianjin is attempted to adopt " brand-new quantization method ", the doorplate of Kunming is attempted to adopt " distance numbers method ", the doorplate of Xi'an is attempted to adopt " doorplate rice number system " etc., these all attempt to change number, but because number and residence booklet, property ownership certificates etc. are associated together, should not change, therefore the effect of method is all dissatisfied at present.

Summary of the invention

The object of the invention is to solve the difficult problem existed in above-mentioned prior art, a kind of intelligent directional mileage sign being provided and realizing the method for coordinate conversion, for not changing number, realizing the easy-to-look-up of number.

The present invention is achieved by the following technical solutions:

A kind of intelligent directional mileage sign, do not change number, by the number described intelligent directional mileage sign being arranged on city equipment, or be arranged on (such as automobile, bus stop, police kiosk, newsstand, old man, child etc.) in transportable city equipment, it comprises latitude and longitude coordinates acquisition device, coordinate transformation device and display device;

Described latitude and longitude coordinates acquisition device is for obtaining the latitude and longitude coordinates of city equipment;

Described coordinate transformation device is used for the direction mile coordinate latitude and longitude coordinates of described city equipment being converted to this city equipment;

Described display device is for showing the direction mile coordinate of described city equipment;

Described direction mile coordinate is two-dimensional coordinate.

The direction mile coordinate of described city equipment refers to the position of this city equipment in direction mile coordinate system, described direction mile coordinate system refers to: with the center, city in the city at described city equipment place for true origin, the East, West, South, North four direction lines crossing described true origin are coordinate axis, as shown in Figure 7.

Described latitude and longitude coordinates acquisition device obtains the latitude and longitude coordinates of city equipment by GPS receiving trap, or obtains the latitude and longitude coordinates of city equipment by satellite photomap, or is measured the latitude and longitude coordinates obtaining city equipment by GPS.

Described display device is tabular board or electronics board; Tabular board is printed with the direction mile coordinate of described city equipment, as shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, or on electronics board, shows the direction mile coordinate of described city equipment.

Described intelligent directional mileage sign comprises emitter further, and described emitter is used for launching the direction mile coordinate of city equipment and the title of city equipment to radio receiver.Described radio receiver is have the device or equipment that receive wireless signal function in mobile phone or PDA or other prior aries.

Realize a method for coordinate conversion, the direction mile that the latitude and longitude coordinates by described city equipment converts this city equipment to sits calibration method, said method comprising the steps of:

(1) start

(2) latitude and longitude coordinates of city equipment is obtained by latitude and longitude coordinates acquisition device, i.e. B and L;

(3) basic parameter and true origin parameter are set; Described basic parameter comprises: semimajor axis of ellipsoid a, semiminor axis of ellipsoid b, the local dispersed elevation h in city; Described true origin parameter comprises: intown latitude coordinate Bo, intown longitude coordinate Lo;

(4) calculate north and south rectangular coordinate x, the north and south rectangular coordinate x obtained is decimal, and unit is kilometer, comprises integral part X1 and fraction part X2, and described fraction part X2 gets 3;

(5) North and South direction mileage coordinate is calculated:

If x is less than 0, then North and South direction mileage coordinate=southern X1+X2, otherwise North and South direction mileage coordinate=northern X1+X2;

(6) calculate thing rectangular coordinate y, the thing rectangular coordinate y obtained is decimal, and unit is kilometer, comprises integral part Y1 and fraction part Y2, and described fraction part Y2 gets 3;

(7) east-west direction mileage coordinate is calculated:

If y is less than 0, then east-west direction mileage coordinate=western Y1+Y2, otherwise east-west direction mileage coordinate=eastern Y1+Y2;

(8) latitude and longitude coordinates, the North and South direction mileage coordinate obtained by step (5) and the east-west direction mileage coordinate obtained by step (7) that are obtained by step (2) is exported.

Calculate north and south rectangular coordinate x in described step (4) to adopt following projection just calculating formula to realize:

X=(B-Bo) M _{on average}+ (L-Lo) ²n sin (2B)/4

Calculate thing rectangular coordinate y in described step (6) to adopt following projection just calculating formula to realize:

y＝(L-Lo)N cos(B)

Wherein,

X is north and south rectangular coordinate;

Y is thing rectangular coordinate;

Mo is intown radius of curvature of meridian;

No is intown radius of curvature in prime vertical;

B is the latitude coordinate of city equipment;

L is the longitude coordinate of city equipment;

M is the radius of curvature of meridian of city equipment;

N is the radius of curvature in prime vertical of city equipment;

N refers to and the central meridian arc length of B to Bo is divided into n section;

M _{on average}the mean value of the multiple spot radius of curvature of meridian M between B to Bo:

M _{on average}=(Mo+M1+M2+ ... + Mn)/(n+1);

Semimajor axis of ellipsoid a, semiminor axis of ellipsoid b adopt 2000 national earth coordinates parameters

a＝6378.137km

b＝6356.75231414km

It is that projecting plane obtains that described M and N chooses local Mean height plane, specific as follows:

M＝a(1-e ²)/W ³+h

N＝a/W+h

Wherein,

e ²＝1-b ²/a ²

W ²＝1-e ² sin ²(B)。

Compared with prior art, the invention has the beneficial effects as follows:

(1) accurate location of directional mileage sign determination city equipment of the present invention is utilized, accurately uniquely, steady in a long-term, unalterable.Do not change number, realize to number, building plate convenient, fast, accurately search;

(2) the invention solves people thirst for solving always but fail the technical barrier of " number is easy-to-look-up and road name is easy-to-look-up " that succeed all the time;

(3) directional mileage sign of the present invention shows the exact position of building, crossing, doorway, mileages of transport route, city equipment, because directional mileage sign does not mark place name, road name, building name, therefore, after those name changings of place name Lu Minglou name, directional mileage sign need not change.Place name road name regularly can be revised by city Department of Civil Affairs, can not affect the easy-to-look-up of number.Directional mileage sign can distinguish the position of the place name road name of duplication of name, so need not revise place name road name because of duplication of name.

(4) city is plane, and directional mileage sign of the present invention is two-dimensional coordinate board, and the coordinate of Shi Dao city centre distance, locates to number with it, can bring convenience for city equipment management.

(5) number and residence booklet, property ownership certificate etc. are associated together, and should not change, the present invention does not change number, and from then on, number, residence booklet, property ownership certificate need not be revised by city relevant department.

(6) new residential area, have accurately unique at the very start, steady in a long-term, unalterable directional mileage sign, brings a lot of convenience to management.

(7) on " direction kilometer lattice map ", the position finding positive street is easy to.Positive street title board changes " meter Zheng street, direction hundred title board " into and achieves the title digitizing of positive street, both easy-to-look-up, does not change again positive street title, is convenient to the protection to road name cultural heritage.

(8) on automobile navigation instrument, after input direction mileage, return display direction mileage and organization, door-to-door navigation can be realized.

Accompanying drawing explanation

Fig. 1 is the structural representation of intelligent directional mileage sign of the present invention.

Fig. 2 is the step block diagram of the inventive method.

Fig. 3 is the directional mileage sign of the building in the embodiment of the present invention.

Fig. 4 is the directional mileage sign of the road both sides in the embodiment of the present invention.

Fig. 5 is meter Zheng street, the direction hundred title board in the embodiment of the present invention.

Fig. 6 is the road direction kilometer board in the embodiment of the present invention.

Fig. 7 is the direction mile coordinate system schematic diagram in the embodiment of the present invention, direction kilometer lattice map.

Fig. 8 is of the present invention for the intown reference diagram having the circular pattern of label character.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail:

At present, the Gauss formula of the employing in the annex " enabling 2000 national earth coordinates embodiments " in State Bureau of Surveying and Mapping comprises:

1, Gauss projection just calculates formula:

$x=X+\mathrm{Nt}{\cos }^{2}B\frac{l^2}{{\mathrm{\ρ}}^2}[0.5+\frac{1}{24}(5-t^2+9{\mathrm{\η}}^2+4{\mathrm{\η}}^4){\cos }^{2}B\frac{l^2}{{\mathrm{\ρ}}^2}+\frac{1}{720}(61-58t^2+t^4){\cos }^{4}B\frac{l^4}{{\mathrm{\ρ}}^4}]$

$y=N\cos B\frac{l}{\mathrm{\ρ}}[1+\frac{1}{6}(1-t^2+{\mathrm{\η}}^2){\cos }^{2}B\frac{l^2}{{\mathrm{\ρ}}^2}+\frac{1}{120}(5-18t^2+t^4+14{\mathrm{\η}}^2-58{\mathrm{\η}}^2{t}^2)N{\cos }^{4}B\frac{l^4}{{\mathrm{\ρ}}^4}]$

Meridian arc length X

X＝a(1-e ²)(A′arcB-B′sin 2B+C′sin 4B-D′sin 6B

+E′sin 8B-F′sin 10B+G′sin 12B)

In formula

$A^{\′}=1+\frac{3}{4}{e}^2+\frac{45}{64}{e}^4+\frac{175}{256}{e}^6+\frac{11025}{16384}{e}^8+\frac{43659}{65536}{e}^{10}+\frac{69693}{1048576}{e}^{12}$

$B^{\′}=\frac{3}{8}{e}^2+\frac{15}{32}{e}^4+\frac{525}{1024}{e}^6+\frac{2205}{4096}{e}^8+\frac{72765}{131072}{e}^{10}+\frac{297297}{524288}{e}^{12}$

$C^{\′}=\frac{15}{256}{e}^4+\frac{105}{1024}{e}^6+\frac{2205}{16384}{e}^8+\frac{10395}{65536}{e}^{10}+\frac{1486485}{8388608}{e}^{12}$

$D^{\′}=\frac{35}{3072}{e}^6+\frac{105}{4096}{e}^8+\frac{10395}{262144}{e}^{10}+\frac{55055}{1048576}{e}^{12}$

$E^{\′}=\frac{315}{131072}{e}^8+\frac{3465}{524288}{e}^{10}+\frac{99099}{8388608}{e}^{12}$

$F^{\′}=\frac{693}{1310720}{e}^{10}+\frac{9009}{5242880}{e}^{12}$

$G^{\′}=\frac{1001}{8388608}{e}^{12}$

$f=\frac{a-b}{a}$

$b=a\sqrt{1-e^2}$

E-first excentricity $e=\frac{\sqrt{a^2-b^2}}{a}$

e ²＝2f-f ²

E '-the second excentricity $e^{\′}=\frac{\sqrt{a^2-b^2}}{b}$

η ²＝e′ ² cos ² B

t＝tgB

$V=\sqrt{1+e^{\′2}{\cos }^{2}B}$ V ²＝1+η ²

$W=\sqrt{1-e^2{\sin }^{2}B}$

$c=\frac{a^2}{b}$

M-radius of curvature of meridian $M=\frac{a(1-e^2)}{W^3}=\frac{c}{V^3}$

N-radius of curvature in prime vertical

The numerical value of the earth ellipsoid parameter that 2000 national earth coordinates adopt is:

Major semi-axis a=6378137m

Minor semi-axis b=6356752.31414m

2, Gauss projection inversion formula:

$B=B_f-\frac{\mathrm{\ρ}{t}_f}{2M_f}y\left(\frac{y}{N_f}\right)[1-\frac{1}{12}(5+3t_f^2+{\mathrm{\η}}_f^2-9{\mathrm{\η}}_f^2{t}_f^2){\left(\frac{y}{N_f}\right)}^2+\frac{1}{360}(61+90t_f^2+45t_f^2){\left(\frac{y}{N_f}\right)}^4]$

$l=\frac{\mathrm{\ρ}}{\cos B_f}\left(\frac{y}{N_f}\right)[1-\frac{1}{6}(1+2t_f^2+{\mathrm{\η}}_f^2){\left(\frac{y}{N_f}\right)}^2+\frac{1}{120}(5+28t_f^2+24t_f^4+6{\mathrm{\η}}_f^2+8{\mathrm{\η}}_f^2{t}_f^2){\left(\frac{y}{N_f}\right)}^4]$

η in formula _f, t _fbe respectively by B _fthe respective amount that value calculates, B _fcalculating see annex.

3, latitude of pedal B _fiterative formula:

$B_0=\frac{X}{a(1-e^2)A},$ $B_{i+1}=B_i+\frac{X-F\left(B_i\right)}{F^{\′}\left(B_i\right)}$

Until B _i-1-B _ibe less than some appointment numerical value, can iteration be stopped.

In formula

F(B)＝a(1-e ²)[A′arcB-B′sin 2B+C′sin 4B-D′sin 6B

+E′sin8B-F′sin10B+G′sin12B]

F′(B)＝a(1-e ²)[A′-2B′cos2B+4C′cos4B-6D′cos6B

+8E′cos8B-10F′cos10B+12G′cos12B]

Gauss formula true origin goes up under the line, and subpoint is on section, and Meridian arc length X formula is complicated, and Gauss projection inversion formula is complicated.Gauss projection is just being calculated in the expression of thing rectangular coordinate computing formula y of formula, due to outside bracket, has had radius of curvature in prime vertical N, so N should do not had again in bracket, N in bracket in Section 3, should remove, and N is the number having dimension being greater than 6378137m.Because inventor is just calculating formulae discovery direction mile coordinate with Gauss projection, so that the result of calculation of the formula of deriving with inventor compares, so found this problem.

Because city equipment is all on the ellipsoid of the earth, and existing Gauss formula is projected on section, length variations can be caused in theory, the new projection formula so the present invention has derived, its principle is that latitude and longitude coordinates is projected on the ellipsoid of the earth, and to choose local Mean height plane be projecting plane.Although the true origin of Gauss formula is under the line, and the true origin of formula of the present invention and Fixed Initial Point Dou city central point, both true origin are different, but, when both central meridians are identical with Fixed Initial Point, in city scope, both result of calculation is identical.

Although formula of the present invention is different from Gauss formula, both result of calculation is identical, so just serves the effect of cross reference, and for a large amount of calculating, then different formula must be adopted to carry out cross reference.

The formula of the calculating Meridian arc length X of Gauss formula is complicated.Formula of the present invention, when calculating the Meridian arc length of difference of latitude, adopts difference of latitude to be multiplied by average radius of curvature of meridian M _{on average}, M _{on average}the mean value of the multiple spot radius of curvature of meridian M between B to Bo.Gauss projection inversion formula is complicated, projection inversion formula string position of the present invention method (rule of three) iteration, and formula is simple, and in city, known x, y, Bo, Lo inverse B, L, be once just met the result of precision, without successive ignition.Formula of the present invention is specific as follows:

1, the present invention's projection just calculates formula:

Known B, L, Bo, Lo calculate x, y

X=(B-Bo) M _{on average}+ (L-Lo) ²n sin (2B)/4

y＝(L-Lo)N cos(B)

In formula

X-north and south rectangular coordinate

Y-thing rectangular coordinate

Angle B, Bo, L, Lo-unit radian

Length M _{on average}, N-unit km

The latitude coordinate of B, Bo-city equipment point, city's central point

The longitude coordinate of L, Lo-city equipment point, city's central point

The radius of curvature of meridian of M, Mo-city equipment point, city's central point

The radius of curvature in prime vertical of N, No-city equipment point, city's central point

The central meridian arc length of n-B to Bo, is divided into n section

M _{on average}=(Mo+M1+M2+ ... + Mn)/(n+1)

M _{on average}-be the mean value of multiple spot radius of curvature of meridian M between B to Bo

Semimajor axis of ellipsoid a, semiminor axis of ellipsoid b adopt 2000 national earth coordinates parameters

a＝6378.137km

b＝6356.75231414km

The local dispersed elevation of h-

e ²＝1-b ²/a ²

W ²＝1-e ² sin ²(B)

Choosing local Mean height plane is projecting plane

Radius of curvature of meridian M, radius of curvature in prime vertical N will add local dispersed elevation h

M＝a(1-e ²)/W ³+h

N＝a/W+h

2, the present invention projects inversion formula:

Known x, y, Bo, Lo inverse B, L

B is solved with string position method (rule of three).

Projected by the present invention and just calculate formula:

X=(B-Bo) M _{on average}+ (L-Lo) ²n sin (2B)/4

After derivation: (because the L in above formula is unknown number, the y in following formula is known number)

X=(B-Bo) M _{on average}+ y ²tan (B)/(2*N)

:

F (B)=(B-Bo) M _{on average}+ y ²tan (B)/(2*N)-x

A unknown number B is only had in above formula

Until f (B2)-f (B1) is less than some appointment numerical value, can iteration be stopped, the B obtained, the B required exactly, by string position method (rule of three) iteration, solve B.

Make B1=Bo+x/Mo B2=Bo substitute into f (B) and obtain f (B1), f (B2)

In city, the latitude coordinate calculating city equipment transfer point repeatedly need not fall generation, once can draw the value meeting precision, city equipment transfer point:

Latitude coordinate is B=B1-(B2-B1) f (B1)/(f (B2)-f (B1))

Longitude coordinate is L=y/ (N cos (B))+Lo

The structural representation of intelligent directional mileage sign as shown in Figure 1, when latitude and longitude coordinates acquisition device by GPS receiving trap obtain latitude and longitude coordinates time, the gps receiver with USB 2.0 interface can be adopted, its can plug and play on notebook computer.

The step block diagram of the inventive method as shown in Figure 2, comprises 8 steps as shown in table 1:

Table 1

Table 2 gives the example of the above-mentioned steps city equipment direction mile coordinate that (8) export and latitude and longitude coordinates table.

Table 2

The position of kilometer board is invisible on urban road, can utilize the latitude and longitude coordinates position of whole kilometer board, installs kilometer board.First with the direction mile coordinate of two adjacent intersections, can determine the direction mile coordinate of whole km with interpolation calculation, recycle described the present invention and to project inversion formula, the direction mile coordinate of whole km, inverse becomes the latitude and longitude coordinates of whole km:

Utilize formula B=B1-(B2-B1) f (B1)/(f (B2)-f (B1))

The latitude coordinate B of the whole kilometer point of inverse road;

Utilize formula: L=y/ (N cos (B))+Lo

The longitude coordinate L of the whole kilometer point of inverse road;

Obtain the latitude and longitude coordinates table of the whole km of urban road as shown in table 3.

Table 3

During embody rule, directional mileage sign of the present invention designs in the following manner and obtains:

1, the position of city's central point is determined by municipal government

The circular pattern position of city's central point is determined by municipal government, to distinguish the circular pattern of other positions in city, circular pattern will be positioned at ground, circular pattern will mark city title, the diameter of word should be greater than 10 meters, can clearly see city title on satellite photomap, such as shown in Figure 8, the circular pattern of diameter 50 meters, pattern has label character.The shooting point of satellite photomap, not directly over city, pattern is positioned at ground, so that on satellite photomap, collects intown latitude and longitude coordinates accurately.When the unit of longitude and latitude is for degree every minute and second, least count is 0.01 second, and reduced length is 0.3m, and when the unit of longitude and latitude is for spending, least count is 0.000001 degree, and reduced length is 0.1 meter.

2, city direction mile coordinate system is set up

The true origin of the direction mile coordinate system in city is at described city's central point, and the four corners of the world crossing initial point is coordinate axis, as shown in Figure 7.

3, the direction kilometer lattice map of mark is reduced

Map increases direction kilometer lattice, existing map is become " direction kilometer lattice map ".On existing map, namely reduce content such as mark high buildings and large mansions, business unit etc.Kilometer lattice map is that one simple, succinct, information is few, adds the map of direction kilometer lattice, as shown in Figure 7.

4, have " the map label sorted table " of " direction mile, organization "

As shown in Figure 7, " direction kilometer lattice map " is the map that information is few, for sorting devices such as " bank, post office, hospital, pharmacy, museum, library, sight spot, park, dining room, restaurant, stadiums, supermarket, market, chain stores ", set up respectively " the map label sorted table " that have " direction mile position, organization ", after being attached to " direction kilometer lattice map ".So both facilitated the position of searching unit on the kilometer lattice map of direction, again can a large amount of content of classification annotation.

There is direction mile to the location of place name, road name, just can distinguish the place name of duplication of name, name position, road, the protection to place name, road name cultural heritage can have been realized again.

5, the directional mileage sign of building

Observable city equipment in satellite photomap, as crossing, building, gate etc., can gather latitude and longitude coordinates from satellite photomap.The shooting point of satellite photomap, the not positive overhead in city, ensure that the building central point gathered is the latitude and longitude coordinates of the ground central point of building.For Beijing's international trade 3, result of calculation is in table 2, and direction mile is " northern 0+602, eastern 5+216 ", and directional mileage sign as shown in Figure 3.The word that thing is identical with North and South direction size.

6, the directional mileage sign of road two side apparatus

Invisible city equipment on satellite photomap, as light pole etc., then measures its longitude and latitude with geodetic type receiver GPS.The directional mileage sign of road two side apparatus is the directional mileage sign of light pole, shop front room, entrance of lane, unit gate and other city equipment.The directional mileage sign being positioned at road both sides is distinguished by color and odd or even number.The number of road both sides, the general odd or even number that adopts is distinguished, and the odd or even number rule in each city is different, and the odd or even number rule of Beijing is, two south, east is two, and north, Xidan is single.Directional mileage sign is not number, and be the label determining number position, position can not repeated code.For being consistent with existing odd or even number rule, adopt the directional mileage sign of the light pole of color and odd or even number differentiation road both sides, shop front room, entrance of lane, unit gate, other city equipment, represent road side by a kind of color, represent the directional mileage sign of road opposite side by another kind of color.Distinguish by color, see the color of directional mileage sign, just know the direction of traveling, very eye-catching.For Beijing University of Post & Telecommunication west gate, be positioned at Xueyuan Road, result of calculation is in table 2, and direction mile even numbers is " northern 6+022, western 3+604 ", and directional mileage sign as shown in Figure 4.Represent the direction mile large size word of mileages of transport route, do not represent the small size word of direction mile of mileages of transport route.

7, meter Zheng street, direction hundred title board

Positive street refers to that trend is the street of north and south or thing, and the not positive street of trend is Byway.Positive street road name is referred to as positive street title.Before the title of positive street, increase by hundred meters, direction, formed " digitizing positive street title ", conveniently search on " direction kilometer lattice map ".Illustrating, from North 4th Ring Road will new bridge to South 4th Ring Road Community West Bridge, is the road of south-north direction, Shi Zheng street, and total length, less than the continuous road of 18 kilometers, has used multiple road name, and object is exactly conveniently segment lookup house number.Shortcoming is that road name is many, is not easy to remember, is inconvenient to search.

North Street, Xidan is the road of south-north direction, Shi Zheng street, crossing is positioned at coordinate axis " west 20 " hundred meters (i.e. western 2km), and positive street title is constant, positive street title board changes into " meter Zheng street, direction hundred title board ", conveniently searches on " direction kilometer lattice map ".Duo Tiaozheng street title board changes into respectively:

West 24 _{hundred meters}east Road, garden, west 24 _{hundred meters}bei Taipingzhuang road, west 23 _{hundred meters}xinjiekouwai Dajie,

West 22 _{hundred meters}street, west 21 in Xin Jie Kou _{hundred meters}xinjiekounan Dajie, west 21 _{hundred meters}xisibei Dajie,

West 21 _{hundred meters}xisinan Dajie, west 20 _{hundred meters}north Street, Xidan, west 20 _{hundred meters}xuanwumennei Dajie,

West 20 _{hundred meters}xuanwumenwai Dajie, west 20 _{hundred meters}mouth street, food market, west 20 _{hundred meters}kai Yanglu,

West 22 _{hundred meters}west Road, Ma Jia fort.

Positive street title board " North Street, Xidan " changes into " west 20 _{hundred meters}north Street, Xidan ", as shown in Figure 5, on " direction kilometer lattice map ", be easy to the position finding positive street.Positive street title board changes " meter Zheng street, direction hundred title board " into and achieves the title digitizing of positive street, both easy-to-look-up, does not change again positive street title, is convenient to the protection to road name cultural heritage.

8, direction kilometer board is set up in or road-center isolation strip other at road, and result of calculation is in table 3, and direction kilometer board as shown in Figure 6.

9, fabrication direction mileage board

By the data of direction mile coordinate, fabrication direction mileage board.Directional mileage sign material and style and existing building plate, number, road sign are identical.Also can Separate designs.The directional mileage sign of road both sides can by different colors, and such as, side is wrongly written or mispronounced character of the blue end, and side is wrongly written or mispronounced character of the green end, sees the color of directional mileage sign, just knows the direction of traveling, very eye-catching.

10, installation direction mileage board

Directional mileage sign engineering is government's convenient project, be solution party's side door trade mark search technical barrier Innovation project, be the Innovation project of city map position coordinates, map label number table, advise being set up the project by NGO, tissue is installed.

Technique scheme is one embodiment of the present invention, for those skilled in the art, on the basis that the invention discloses application process and principle, be easy to make various types of improvement or distortion, and the method be not limited only to described by the above-mentioned embodiment of the present invention, therefore previously described mode is just preferred, and does not have restrictive meaning.

Claims (7)

1. realize a method for coordinate conversion, said method comprising the steps of:

(1) start

(2) obtained the latitude and longitude coordinates of city equipment by the latitude and longitude coordinates acquisition device of intelligent directional mileage sign, namely B and L, B are the latitude coordinates of city equipment, and L is the longitude coordinate of city equipment;

(3) basic parameter and true origin parameter are set; Described basic parameter comprises: semimajor axis of ellipsoid a, semiminor axis of ellipsoid b, the local dispersed elevation h in city; Described true origin parameter comprises: intown latitude coordinate Bo, intown longitude coordinate Lo;

(4) calculate north and south rectangular coordinate x, the north and south rectangular coordinate x obtained is decimal, and unit is kilometer, comprises integral part X1 and fraction part X2, and described fraction part X2 gets 3;

(5) North and South direction mileage coordinate is calculated:

If x is less than 0, then North and South direction mileage coordinate=southern X1+X2, otherwise North and South direction mileage coordinate=northern X1+X2;

(6) calculate thing rectangular coordinate y, the thing rectangular coordinate y obtained is decimal, and unit is kilometer, comprises integral part Y1 and fraction part Y2, and described fraction part Y2 gets 3;

(7) east-west direction mileage coordinate is calculated:

If y is less than 0, then east-west direction mileage coordinate=western Y1+Y2, otherwise east-west direction mileage coordinate=eastern Y1+Y2:

(8) latitude and longitude coordinates, the North and South direction mileage coordinate obtained by step (5) and the east-west direction mileage coordinate obtained by step (7) that are obtained by step (2) is exported.

2. the method realizing coordinate conversion according to claim 1, is characterized in that:

Calculate north and south rectangular coordinate x in described step (4) to adopt following projection just calculating formula to realize:

X=(B-Bo) M _{on average}+ (L-Lo) ²n sin (2B)/4

Calculate thing rectangular coordinate y in described step (6) to adopt following projection just calculating formula to realize:

y＝(L-Lo)N cos(B)

Wherein,

X is north and south rectangular coordinate;

Y is thing rectangular coordinate;

Mo is intown radius of curvature of meridian;

B is the latitude coordinate of city equipment;

L is the longitude coordinate of city equipment;

M is the radius of curvature of meridian of city equipment;

N is the radius of curvature in prime vertical of city equipment;

N refers to and the central meridian arc length of B to Bo is divided into n section;

M _{on average}the mean value of the multiple spot radius of curvature of meridian M between B to Bo:

M _{on average}=(Mo+M1+M2+ ... + Mn)/(n+1);

Semimajor axis of ellipsoid a, semiminor axis of ellipsoid b adopt 2000 national earth coordinates parameters

a＝6378.137 km

b＝6356.75231414 km

It is that projecting plane obtains that described M and N chooses local Mean height plane, specific as follows:

M＝a(1-e ²)/W ³+h

N＝a/W+h

Wherein,

e ²＝1-b ²/a ²

W ²＝1-e ²sin ²(B)。

3. the method realizing coordinate conversion according to claim 2, it is characterized in that: do not change number, by the number described intelligent directional mileage sign being arranged on city equipment, or be arranged in transportable city equipment, it comprises latitude and longitude coordinates acquisition device, coordinate transformation device and display device;

Described latitude and longitude coordinates acquisition device is for obtaining the latitude and longitude coordinates of city equipment;

Described coordinate transformation device is used for the direction mile coordinate latitude and longitude coordinates of described city equipment being converted to this city equipment;

Described display device is for showing the direction mile coordinate of described city equipment;

Described direction mile coordinate is two-dimensional coordinate.

4. the method realizing coordinate conversion according to claim 3, it is characterized in that: the direction mile coordinate of described city equipment refers to the position of this city equipment in direction mile coordinate system, described direction mile coordinate system refers to: with the center, city in the city at described city equipment place for true origin, and the East, West, South, North four direction lines crossing described true origin are coordinate axis.

5. the method realizing coordinate conversion according to claim 4, it is characterized in that: described latitude and longitude coordinates acquisition device obtains the latitude and longitude coordinates of city equipment by GPS receiving trap, or obtained the latitude and longitude coordinates of city equipment by satellite photomap, or measured the latitude and longitude coordinates obtaining city equipment by GPS.

6. the method realizing coordinate conversion according to claim 5, is characterized in that: described display device is tabular board or electronics board; Tabular board is printed with the direction mile coordinate of described city equipment, or on electronics board, shows the direction mile coordinate of described city equipment.

7. according to the arbitrary described method realizing coordinate conversion of claim 3-6, it is characterized in that: described intelligent directional mileage sign comprises emitter further, described emitter is used for launching the direction mile coordinate of city equipment and the title of city equipment to radio receiver.