Implementation of the map amplitude splitting component (2) -- spatial reference setting component

According to the national standard, the projection definitions of maps at different scales are different. According to the latest National Standard, No matter what projection, the 2000 coordinate system is used.

For example, the other scales are the same. According to GB/T 20257.4-2007 of the national standard, the 2000 geographic coordinate system is used for the Topographic Map Drawing Scheme with a scale of 1 to, and the projection coordinate system adopts the dual-standard weft cone projection with an equal-angle positive axis.

The geographical coordinate system parameters are as follows:

2000 the earth elliptical parameters used in the national Earth coordinate system are:

Long half axis A = 6378137 m

Flattening rateF= 1/298. 257222101

Gravity constant GM = 3.986004418 × 1014m3s-2

Auto rotate speed ω = 7.292l15 × 10-5rad S-1

 

Other parameters are shown in the following table:

Short Radius B (M)	6356752.31414
Polar curvature radius C (m)	6399593.62586
First eccentric heart rate e	0.0818191910428
First eccentric heart rate square E2	0.00669438002290
Secondary eccentric Heart Rate	0.0820944381519
Second eccentric heart rate square 2	0.00673949677548
1/4 Meridian Circle length Q (m)	10001965.7293
Average elliptical radius r1 (m)	6371008.77138
Ball radius R2 (m) with the same surface area)	6371007.18092
Ball radius of the same volume R3 (m)	6371000.78997
Normal position U0 of the elliptical (m2s-2)	62636851.7149
Dynamic shape factor J2	0.001082629832258
Spherical Harmonic Coefficient J4	-0.00000237091126
Spherical Harmonic Coefficient J6	0.00000000608347
Spherical Harmonic Coefficient J8	-0.00000000001427
	0.00344978650678
Normal equator gravity value gamma E (gamma)	9.7803253361
Normal polar gravity value gamma P (gamma)	9.8321849379
Normal gravity mean gamma (gamma)	9.7976432224
Normal gravity value of 45 degrees at latitude gamma 45 ° (gamma)	9.8061977695

Reference Source: http://baike.baidu.com/view/2696998.htm

 

According to the requirements of the split drawing, the current projection coordinate system can be obtained through the graph number.

The component interface is designed as follows:

Through the igbcartospatialreferencefactory interface, you can directly obtain the geographic coordinate system interface. Because CGCs has the same geographical coordinate system (CGCs) at all scales, you can use it without defining parameters. The projection coordinate system is different. The projection coordinates of different scales and different map numbers may be different. Therefore, it must be determined by parameters.

After the interface is implemented, j50 is used as an example to display parameters in ArcGIS, as shown in

 

After the problem of projection is solved, data can be used by means of dynamic projection. Through projection, a very precise and strict graphic profile defined by the national standard can be designed.

Reprinted Please note: http://blog.csdn.net/jx1228/archive/2011/05/09/6406989.aspx