Find the number of layers in a Spatial Object

There are already methods for Raster* in the raster package. Adding methods for list, SpatialPolygons, SpatialLines, and SpatialPoints, gg, histogram, igraph. These latter classes return 1.

numLayers(x)

# S4 method for list
numLayers(x)

# S4 method for .quickPlot
numLayers(x)

# S4 method for Raster
numLayers(x)

# S4 method for Spatial
numLayers(x)

# S4 method for ANY
numLayers(x)

Arguments

x	A .quickPlotObjects object or list of these.

Value

The number of layers in the object.

Examples

library(igraph)
library(raster)

files <- system.file("maps", package = "quickPlot") %>%
  dir(., full.names = TRUE, pattern = "tif")
maps <- lapply(files, function(x) raster(x))
names(maps) <- sapply(basename(files), function(x) {
  strsplit(x, split = "\\.")[[1]][1]
})
stck <- stack(maps)

numLayers(maps)
#> [1] 5
numLayers(stck)
#> [1] 5