gcMaxLat

0th

Percentile

Highest latitude on a great circle

What is northern most point that will be reached when following a great circle? Computed with Clairaut's formula. The southern most point is the antipode of the northern-most point. This does not seem to be very precise; and you could use optimization instead to find this point (see examples)

Keywords
spatial
Usage
gcMaxLat(p1, p2)
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
Value

  • A matrix with coordinates (longitude/latitude)

References

http://williams.best.vwh.net/ftp/avsig/avform.txt http://www.movable-type.co.uk/scripts/latlong.html

See Also

gcLat, gcLon

Aliases
  • gcMaxLat
Examples
gcMaxLat(c(5,52), c(-120,37))

# Another way to get there:
f <- function(lon){gcLat(c(5,52), c(-120,37), lon)}
optimize(f, interval=c(-180, 180), maximum=TRUE)
Documentation reproduced from package geosphere, version 1.5-1, License: GPL (>= 3)

Community examples

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