I hope someone can give me a start point to solve my problem.
I have an raster image showing the occurence prediction of a clam species. So, I have a set of coordinates, xyz like, that I would like to display over this image. I've used the function points
, to display the points over the map.
Example:
myraster<-raster(nrows=250, ncols=217, xmn=540222, xmx=546732, ymn=6652656, ymx=6660156, crs=NA) # creating a raster object
set.seed(12) # placing values into raster
values(myraster) <- runif(ncell(myraster))
head(dataXYZ) # an sample of my XYZ dataset
x y z
1 544500 6658000 11
2 545500 6657000 9
3 546000 6655000 2
4 544000 6655000 1
5 545000 6656500 17
6 545500 6656500 10
plot(myraster)
points(dataXYZ)
I would like to display these points with sizes proportional to the z values associated, as balloon plot in R. Also an legend.
Do Someone can give any tip to do this? An start point?
Thanks!
dont know what you consider a balloon plot but do you want to do this?
x <- c(1, 2, 3, 4)
y <- c(1, 2, 3, 4)
size <- c(1, 2, 3, 4)
df <- data.frame(x, y, size)
plot(x, y, cex=size)