1options("rgdal_show_exportToProj4_warnings"="none") 2library(sp) 3g = SpatialGrid(GridTopology(c(5,5), c(10,10), c(3,3))) 4p = as(g, "SpatialPolygons") 5p$z = c(1,0,1,0,1,0,1,0,1) 6cc = coordinates(g) 7p$ag1 = aggregate(p, p, mean)[[1]] 8p$ag1a = aggregate(p, p, mean, minDimension = 0)[[1]] 9p$ag2 = aggregate(p, p, mean, minDimension = 1)[[1]] 10p$ag3 = aggregate(p, p, mean, minDimension = 2)[[1]] 11p$ag4 = aggregate(p, p, mean, areaWeighted=TRUE)[[1]] 12pts = cbind(c(9,21,21,9,9),c(9,9,21,21,9)) 13sq = SpatialPolygons(list(Polygons(list(Polygon(pts)), "ID"))) 14rnd2 = function(x) round(x, 2) 15l = list( 16 list("sp.text", cc, rnd2(p$z), which = 1), 17 list("sp.text", cc, rnd2(p$ag1), which = 2), 18 list("sp.text", cc, rnd2(p$ag1a), which = 3), 19 list("sp.text", cc, rnd2(p$ag2), which = 4), 20 list("sp.text", cc, rnd2(p$ag3), which = 5), 21 list("sp.text", cc, rnd2(p$ag4), which = 6), 22 list(sq, col = 'green', which = 6, first = FALSE, lwd = 2) 23) 24spplot(p, names.attr = c("source", "default aggregate", "minDimension=0", 25 "minDimension=1", "minDimension=2", "areaWeighted=TRUE"), layout = c(3,2), 26 as.table=TRUE, col.regions=bpy.colors(151)[50:151], cuts=100, 27 sp.layout = l, scales = list(draw = TRUE)) 28 29rnd2(c(aggregate(p, sq, mean)[[1]], 30 aggregate(p, sq, mean, minDimension = 0)[[1]], 31 aggregate(p, sq, mean, minDimension = 1)[[1]], 32 aggregate(p, sq, mean, minDimension = 2)[[1]], 33 aggregate(p, sq, mean, areaWeighted=TRUE)[[1]])) 34