geodist: Hight precision Great circle distance between two places

In spaa: SPecies Association Analysis

Hight precision Great circle distance between two places

Description

Hight precision Great circle distance between two places assuming the earth is elliptic sphere.

Usage

geodist(L1, phi1, L2, phi2)

Arguments

L1	Longitude of first place in decimal format.
phi1	Latitude of first place in decimal format.
L2	Longitude of second place in decimal format.
phi2	Latitude of second place in decimal format.

Details

Hight precision great circle distance between two places assuming the earth is elliptic sphere.

Value

Hight precision great circle distance.

Author(s)

Jinlong Zhang [e-mail]

References

Jean Meeus 1991 Astronomical Algorithms Willmann-Bell 80-83

See Also

lgeodist

Examples

## geodist() example
## Paris
L1 = deg2dec(-2,20,14)
phi1 = deg2dec(48, 50, 11)
## Washington DC
L2 = deg2dec(77,03,56)
phi2 = deg2dec(38,55,17)
##High precision Great Circle distance
geodist(L1, phi1, L2, phi2)

spaa documentation built on April 4, 2025, 2:41 a.m.