Calculate area of polygon
Calculate area of polygon. If the polygon is self-intersecting, the area will not be correct.
areapl(poly)
poly |
a polygon data set |
The area of the polygon is returned
Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis code in S-Plus. Computers and Geosciences, 19, 627-655; the original sources can be accessed at: https://www.maths.lancs.ac.uk/~rowlings/Splancs/. See also Bivand, R. and Gebhardt, A. 2000 Implementing functions for spatial statistical analysis using the R language. Journal of Geographical Systems, 2, 307-317.
x <- c(1,0,0,1,1,1,1,3,3,1) y <- c(0,0,1,1,0,0,-1,-1,0,0) m <- cbind(x, y) plot(m, type="b") areapl(m) areapl(m[1:5,]) areapl(m[6:10,])
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