I have 4 one-band's rasters (same resolution, same extents...) that I want to combine to have a four-band's raster. Anyone could tell me how to do this with R? Thank you.
To create a raster stack of rasters of same extent and resolution, use the stack function in the raster package:
s <- stack(raster1, raster2)
In this case the raster can be a raster object or a file path to a raster.
edit (concrete example):
library(raster)
fn <- system.file("external/test.grd", package="raster")
s <- stack(raster(fn), raster(fn)*2) #here i had to create the raster object since I
#was multiplying one of the input rasters
s
class : RasterStack
dimensions : 115, 80, 9200, 2 (nrow, ncol, ncell, nlayers)
resolution : 40, 40 (x, y)
extent : 178400, 181600, 329400, 334000 (xmin, xmax, ymin, ymax)
coord. ref. : +init=epsg:28992
+towgs84=565.237,50.0087,465.658,-0.406857,0.350733,-1.87035,4.0812 +proj=sterea
+lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.9999079 +x_0=155000 +y_0=463000
+ellps=bessel +units=m +no_defs
names : test.1, test.2
min values : 128.434, 256.868
max values : 1805.78, 3611.56