# pointDistance

From raster v2.1-41
by Robert Hijmans

##### Distance between points

Calculate the geographic distance between two (sets of) points on a sphere (`longlat=TRUE`

) or on a plane (`longlat=FALSE`

).

- Keywords
- spatial

##### Usage

`pointDistance(p1, p2, longlat, ...)`

##### Arguments

- p1
- x and y coordinate of first (set of) point(s), either as c(x, y), matrix(ncol=2), or SpatialPoints*.
- p2
- x and y coordinate of second (set of) second point(s) (like for
`p1`

). If this argument is missing, a distance matrix is computed for`p1`

- longlat
- Logical. If
`TRUE`

, coordinates should be in degrees; else they should represent planar ('Euclidean') space (e.g. units of meters) - ...
- Additional arguments. Can be used to set the radius,
`r`

, of the world (modeled as a sphere), when`longlat=TRUE`

Default is`r=6378137`

##### Value

- A single value, or a vector, or matrix of values giving the distance in meters (longlat=TRUE) or map-units (for instance, meters in the case of UTM)
If
`p2`

is missing, a distance matrix is returned

##### See Also

`distanceFromPoints, distance, gridDistance`

, `spDistsN1`

.
The `geosphere`

package has many additional distance functions and other functions that operate on spherical coordinates

##### Examples

```
a <- cbind(c(1,5,55,31),c(3,7,20,22))
b <- cbind(c(4,2,8,65),c(50,-90,20,32))
pointDistance(c(0, 0), c(1, 1), longlat=FALSE)
pointDistance(c(0, 0), c(1, 1), longlat=TRUE)
pointDistance(c(0, 0), a, longlat=TRUE)
pointDistance(a, b, longlat=TRUE)
#Make a distance matrix
dst <- pointDistance(a, longlat=TRUE)
# coerce to dist object
dst <- as.dist(dst)
```

*Documentation reproduced from package raster, version 2.1-41, License: GPL (>= 3)*

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