Longitude on a Great Circle
Longitudes at which a great circle crosses a latitude (parallel)
gcLon(p1, p2, lat)
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 |
vector of two numbers (longitudes)
Robert Hijmans based on code by Ed Williams
gcLon(c(5,52), c(-120,37), 40)
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