r - Maptools: Plotting different geographic groups with different colors -


i have dataset biological groups , geographic information:

results2

id  latitude    longitude   -3,5     -39,5833   -7,0167  -37,9667   -9,2258  -43,4631 b   -16,6667 -49,5 b   -15,4333 -55,75 b   -19,0333 -57,2167 c   -29,2    -58,1 c   -30      -59,5167 c   -34,5667 -59,1167

i used maptools plotting these points on map, here code:

xlim<-c(min(results2$longitude),max(results2$longitude))    ylim<-c(min(results2$latitude),max(results2$latitude))   readshapelines("americas_adm0.shp") -> shape   plot(shape, xlim=xlim, ylim=ylim)   par(new=true)   ## vamos aqui!!   pontos<- data.frame(results2$longitude,results2$latitude)   colnames(pontos)=c("longitude","latitude")   points(pontos$longitude, pontos$latitude, pch=16, col=2, cex=1)

but dont know how delimit polygons each group, , change color options of studied groups.

i'm not sure understand mean "the polygons of each group" ? perhaps refering known "convex hull" : in case quite few gis packages (such sp) should supply fiunctionality...


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