CalcLongitude: Calculate Longitude

In TrackReconstruction: Reconstruct Animal Tracks from Magnetometer, Accelerometer, Depth and Optional Speed Data

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)

TrackReconstruction documentation built on Dec. 11, 2021, 10:07 a.m.