Change raster panel titles using levelplot

Question

I'm using RasterVis and levelplot to make a trellis plot of some rasters. I am currently ok for most things but I would like to change the header for each panel from the filename to a chosen string (the filename is convoluted and long, i want to use just a year, for example '2004').

Looking at the levelplot page , it would indicate that levelplot goes looking for some settings as per the argument 'useRaster', either it goes to panel.levelplot or panel.levelplot.raster , but im struggling to use these latter functions.

Any help much appreciated, here's some sample code;

require(rasterVis)

layers <- c(1:4)
s2 <- stack()

for (i in layers) {
  r <- raster(nrows=100, ncols=100,ext)
  r[] <- sample(seq(from = 1, to = 6, by = 1), size = 10000, replace = TRUE)
  rasc <- ratify(r)
  rat <- levels(rasc)[[1]]
  rat$legend <- c("A","B","C","D","E","F")
  levels(rasc) <- rat
  s2 <- stack(s2, rasc)
}

levelplot(s2, col.regions=rev(terrain.colors(6)),main = "example")

In the above eg, I would like "layer.1.1" to be "2004", and so on through to 2007

Answer 1

require(rasterVis)

layers <- c(1:4)
s2 <- stack()

for (i in layers) {
  r <- raster(nrows=100, ncols=100)
  r[] <- sample(seq(from = 1, to = 6, by = 1), size = 10000, replace = TRUE)
  rasc <- ratify(r)
  rat <- levels(rasc)[[1]]
  rat$legend <- c("A","B","C","D","E","F")
  levels(rasc) <- rat
  s2 <- stack(s2, rasc)
}
levelplot(s2, col.regions=rev(terrain.colors(6)),main = "example", names.attr=2004:2007)

p.strip <- list(cex=1.5, lines=1, col="blue, fontfamily='Serif')

levelplot(s2, col.regions=rev(terrain.colors(6)), main = "example",
          names.attr=2004:2007, par.strip.text=p.strip)