spaa (version 0.2.5)

lgeodist: 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)

Value

Low precision great circle distance between two places.

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.

Author

Jinlong Zhang

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)