# distCosine

From geosphere v1.2-15
by Robert Hijmans

##### 'Law of cosines' great circle distance

The shortest distance between two points (i.e., the 'great-circle-distance' or 'as the crow flies'), according to the 'law of the cosines'. This method assumes a spherical earth, ignoring ellipsoidal effects.

- Keywords
- spatial

##### Usage

`distCosine(p1, p2, r=6378137)`

##### Arguments

- p1
- longitude/latitude of point(s). Can be a vector of two numbers, a matrix of 2 columns (first one is longitude, second is latitude) or a SpatialPoints* object
- p2
- as above
- r
- radius of the earth; default = 6378137 m

##### Value

- Distance value in the same unit as
`r`

(default is meters)

##### References

##### See Also

##### Examples

`distCosine(c(0,0),c(90,90))`

*Documentation reproduced from package geosphere, version 1.2-15, License: GPL*

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