Nothing
.arcp <- function(xy)
{
if (nrow(xy) < 3)
return(0);
x.segmat <- cbind(xy, rbind(xy[2:nrow(xy), ],
xy[1, ]))
abs(sum(x.segmat[,1] * x.segmat[,4] - x.segmat[,3]
* x.segmat[,2])) / 2
}
.arcpspdf <- function(spdf)
{
lar <- unlist(lapply(polygons(spdf)@polygons,
function(x) unlist(lapply(x@Polygons, function(y)
.arcp(y@coords)))))
lhol <- unlist(lapply(polygons(spdf)@polygons,
function(x) unlist(lapply(x@Polygons, function(y)
y@hole))))
sum(lar[!lhol])-sum(lar[lhol])
}
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