R: Latitude on a Great Circle

gcLat {geosphere} | R Documentation

## Latitude on a Great Circle

### Description

Latitude at which a great circle crosses a longitude

### Usage

    gcLat(p1, p2, lon)

### Arguments

`p1` | Longitude/latitude of a single point, 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
`p2` | As above
`lon` | Longitude

### Value

A numeric (latitude)

### Author(s)

Robert Hijmans based on a formula by Ed Williams

### References

http://williams.best.vwh.net/avform.htm#Int

### See Also

`gcLon, gcMaxLat`

### Examples

    gcLat(c(5,52), c(-120,37), lon=-120)

[Package geosphere version 1.5-5 Index]