# destPoint

##### Destination given bearing (direction) and distance

Given a start point, initial bearing (direction), and distance, this function computes the destination point travelling along a the shortest path on an ellipsoid (the geodesic).

- Keywords
- spatial

##### Usage

`destPoint(p, b, d, a=6378137, f=1/298.257223563, ...)`

##### Arguments

- p
Longitude and Latitude of point(s), in degrees. Can be a vector of two numbers, a matrix of 2 columns (first one is longitude, second is latitude) or a SpatialPoints* object

- b
numeric. Bearing (direction) in degrees

- d
numeric. Distance in meters

- a
major (equatorial) radius of the ellipsoid. The default value is for WGS84

- f
ellipsoid flattening. The default value is for WGS84

- ...
additional arguments. If an argument 'r' is supplied, this is taken as the radius of the earth (e.g. 6378137 m) and computations are for a sphere (great circle) instead of an ellipsoid (geodetic). This is for backwards compatibility only

##### Value

A pair of coordinates (longitude/latitude)

##### Note

Direction changes continuously when travelling along a geodesic. Therefore, the final direction is not the same as the initial direction. You can compute the final direction with `finalBearing`

(see examples, below)

##### References

C.F.F. Karney, 2013. Algorithms for geodesics, J. Geodesy 87: 43-55. https://dx.doi.org/10.1007/s00190-012-0578-z. Addenda: http://geographiclib.sf.net/geod-addenda.html. Also see http://geographiclib.sourceforge.net/

##### Examples

```
# NOT RUN {
p <- cbind(5,52)
d <- destPoint(p,30,10000)
d
#final direction, when arriving at endpoint:
finalBearing(d, p)
# }
```

*Documentation reproduced from package geosphere, version 1.5-10, License: GPL (>= 3)*