12 lines
397 B
Go
12 lines
397 B
Go
package calculator
|
|
|
|
// WGS84 ellipsoid constants
|
|
const (
|
|
EarthRadius = 6378137.0 // 地球半径，单位米
|
|
a = 6378137.0 // semi-major axis in meters
|
|
f = 1 / 298.257223563 // flattening
|
|
b = a * (1 - f) // 短半轴
|
|
e2 = 2*f - f*f // square of eccentricity
|
|
J2000Epoch = 2451545.0 // Julian date of J2000 epoch
|
|
)
|