[R] add single points to a level plot

[Eric Berger]

You need to load the package 'rasterVis'

> library(rasterVis)

HTH,
Eric


On Thu, Mar 8, 2018 at 5:11 PM, lily li <chocold12 at gmail.com> wrote:

> Hi all,
>
> I ran the code:
> > s <- stack(replicate(2, raster(matrix(runif(100), 10))))
> > xy <- data.frame(coordinates(sampleRandom(s, 10, sp=TRUE)),
> +                  z1=runif(10), z2=runif(10))
> > levelplot(s, margin=FALSE, at=seq(0, 1, 0.05)) +
> +   layer(sp.points(xy, pch=ifelse(pts$z1 < 0.5, 2, 3), cex=2, col=1),
> columns=1) +
> +   layer(sp.points(xy, pch=ifelse(pts$z2 < 0.5, 2, 3), cex=2, col=1),
> columns=2)
>
> And got the error:
> Error in UseMethod("levelplot") :
>   no applicable method for 'levelplot' applied to an object of class
> "c('RasterStack', 'Raster', 'RasterStackBrick', 'BasicRaster')"
>
> what is the problem? Thanks.
>
> On Thu, Mar 8, 2018 at 12:07 AM, lily li <chocold12 at gmail.com> wrote:
>
> > Hi all,
> >
> > I'm trying to add single points with known coordinates to a level plot,
> > but could not find the proper answer. I got to know that layer() function
> > is good for this, but I don't know which package is related to this
> > function. The source is here:
> > https://stackoverflow.com/questions/28597149/add-xy-
> points-to-raster-map-
> > generated-by-levelplot
> >
> > but my question is a little different as I know the coordinates of the
> > single point, rather than a range. Thanks for any help you could provide.
> >
>
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