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midlon
2010 Jul 23
1
Midpoint between coordinates
Dear R users,
I need to find the coordinates for the point (midpoint) located half
way between two pairs of coordinates (lon1,lat1 and lon2,lat2)
assuming a straight line between them. What would be the best way? I
tried to find an answer in the help archives but without success. I
would greatly appreciate any help.
df<- data.frame(lon1=c(-4.568,-4.3980), lat1=c(59.235,56.369),