gis - Compass direction (North, West ...) of polygon in R -


i have polygon of gis object,e.g. rectangle. extract of edges according compass orientation. how can that?

here simple example

poly = polygon(cbind(c(2,4,4,1,2),c(2,3,5,4,2))) polygons = polygons(list(poly), "s3") spp = spatialpolygons(list(polygons)) plot(spp)

the upper edgs eg. related north. how can identify via script?


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