lgeodist: Low precision Great circle distance between two places

In spaa: SPecies Association Analysis

Low precision Great circle distance between two places

Description

Calculating Great circle distance between two places assuming that the earth is sphere.

Usage

lgeodist(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.

Value

Low precision great circle distance between two places.

Note

This function assuming that the earth is sphere.

Author(s)

Jinlong Zhang [e-mail]

References

Jean Meeus 1991 Astronomical Algorithms Willmann-Bell 80-81

See Also

geodist

Examples

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

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