gcLon: Longitude on a Great Circle

Description Usage Arguments Value Author(s) References See Also Examples

View source: R/gcLon.R

Description

Longitudes at which a great circle crosses a latitude (parallel)

Usage

1
gcLon(p1, p2, lat) 

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

lat

a latitude

Value

vector of two numbers (longitudes)

Author(s)

Robert Hijmans based on code by Ed Williams

References

http://www.edwilliams.org/avform.htm#Intersection

See Also

gcLat, gcMaxLat

Examples

1
gcLon(c(5,52), c(-120,37), 40)

geosphere documentation built on Nov. 17, 2017, 4:59 a.m.