Nothing
mrA <-
function (mr, dlat = 5, dlon = 10, scale = "nmi")
{
if(!(scale == "nmi" | scale == "km"))
stop("Unit square nautical miles or kilometers only")
A <- sapply(mr, function(x, dlat, dlon)
geoarea(mrPeri(x, dlat = dlat, dlon = dlon)),
dlat = dlat, dlon = dlon)
if(scale == "nmi") A/1.852^2
else A
}
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