| CalcLongitude {TrackReconstruction} | R Documentation |
Calculate Longitude
Description
Calculate the longitude of a destination given initial latitude and longitude, distance traveled, bearing and final latitude.
Usage
CalcLongitude(initialLat, destinationLat, initialLong, distance, bearing)
Arguments
initialLat |
initial Latitude |
destinationLat |
final Latitude |
initialLong |
initial Longitude |
distance |
distance from initial to final in meters |
bearing |
bearing from point of departure to final destination |
Details
Calculates a destination's longitude given initial latitude and longitude in degrees (e.g.162.546, Longitude values west
of the prime meridian are 0 to -180. Latitude values south of the equator are 0 to -90), destination latitude in
RADIANS (result of CalcLatitude function), distance traveled in meters and bearing in radians. This function is
primarily used internally in the GPStable and GeoReference functions.
Value
Longitude of final destination in radians.
Author(s)
Brian Battaile
References
https://www.movable-type.co.uk/scripts/latlong.html
Examples
#Longitude of Los Angeles starting in Manhattan
Long <- CalcLongitude(40.7697,0.5943228,-73.9735,3938000,-1.507516)
#transform to degrees
Long*360/(2*pi)
##Use results of CalcLatitude
Lat<-CalcLatitude (40.7697,3938000,-1.507516)
Long <- CalcLongitude(40.7697,Lat,-73.9735,3938000,-1.507516)
#transform to degrees
Long*360/(2*pi)