Nothing
dr2d <-
function(dr, dlat = 1, dlon = 2, startLat = 50)
{
hemi <- sign(dr + 1e-06)
lat <- startLat + dlat*(abs(dr)%/%100)
lon <- dlon*(dr%%(hemi*100))
data.frame(lat = lat + dlat/2, lon = lon + dlon/2)
}
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