oce (version 0.9-18)

geodXyInverse: inverse geodesic calculation

Description

inverse geodesic calculation

Usage

geodXyInverse(x, y, longitudeRef = 0, latitudeRef = 0)

Arguments

x

value of x in metres, as given by geodXy

y

value of y in metres, as given by geodXy

longitudeRef

reference longitude, as supplied to geodXy

latitudeRef

reference latitude, as supplied to geodXy

Value

• a data frame containing longitude and latitude

Details

The calculation is done by finding a minimum value of a cost function that is the vector difference between (x,y) and the corresponding values returned by geodXy. This minimum is calculated in C for speed, using the nmmin function that is the underpinning for the Nelder-Meade version of the R function optim.