Adding scale labels to levelplot's margins

Question

I'd like to add label showing the values of latitudinal zonal averages to levelplot's gray margin. In the following example, the min and max values for latitudinal means are 286 and 751 respectively. Any suggestion on adding an axis with this information to the margin?

library(raster)
library(rasterVis)
r <- raster(system.file("external/test.grd", package="raster"))
levelplot(r, at=seq(100, 1850, by = 250))
# calculating the latitudinal means
rows <- init(r, v='y')
yAve <- zonal(r, rows, fun='mean',na.rm=TRUE)  
summary(yAve)

I get an error trying to run your code, also, make sure to list all packages you're using. In this case `raster` and `lattice` — Mako212, Nov 03 '17 at 16:35
`levelplot(r, at=seq(100, 1850, by = 250))` returns `no applicable method` — Mako212, Nov 03 '17 at 16:36

Christopher Stephan · Accepted Answer · 2017-11-13T19:55:46.940

4

Use margin=list(axis=TRUE) to add the min and max values to the margin.

library(raster)
library(rasterVis)
r <- raster(system.file("external/test.grd", package="raster"))
levelplot(r, at=seq(100, 1850, by = 250), margin=list(axis=TRUE))

You can change the color and fontsize of the margin labels using gpar.

library(grid)
levelplot(r, at=seq(100, 1850, by = 250), margin=list(axis=gpar(col = 'black', fontsize = 9)))

edited Nov 13 '17 at 19:55

answered Nov 13 '17 at 19:12

Christopher Stephan

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Great, that's much! – Geo-sp Nov 13 '17 at 21:43
Is it possible to control the precision of the values? I'm getting 0.0018 at the low end. Zero is fine.. – derelict Apr 14 '21 at 19:31

Adding scale labels to levelplot's margins

1 Answers1