getValues.RdgetValues returns all values or the values for a number of rows of a Raster* object. Values returned for a RasterLayer are a vector. The values returned for a RasterStack or RasterBrick are always a matrix, with the rows representing cells, and the columns representing layers
values is a shorthand version of getValues (for all rows).
getValues(x, row, nrows, ...)
values(x, ...)Raster* object
Numeric. Row number, should be between 1 and nrow(x), or missing in which case all values are returned
Numeric. Number of rows. Should be an integer > 0, or missing
Additional arguments. When x is a RasterLayer: format to specify the output format. Either "matrix" or, the default "", in which case a vector is returned
vector or matrix of raster values
r <- raster(system.file("external/test.grd", package="raster"))
r
#> class : RasterLayer
#> dimensions : 115, 80, 9200 (nrow, ncol, ncell)
#> resolution : 40, 40 (x, y)
#> extent : 178400, 181600, 329400, 334000 (xmin, xmax, ymin, ymax)
#> crs : +proj=sterea +lat_0=52.1561605555556 +lon_0=5.38763888888889 +k=0.9999079 +x_0=155000 +y_0=463000 +datum=WGS84 +units=m +no_defs
#> source : test.grd
#> names : test
#> values : 138.7071, 1736.058 (min, max)
#>
v <- getValues(r)
length(v)
#> [1] 9200
head(v)
#> [1] NA NA NA NA NA NA
getValues(r, row=10)
#> [1] NA NA NA NA NA NA NA NA
#> [9] NA NA NA NA NA NA NA NA
#> [17] NA NA NA NA NA NA NA NA
#> [25] NA NA NA NA NA NA NA NA
#> [33] NA NA NA NA NA NA NA NA
#> [41] NA NA NA NA NA NA NA NA
#> [49] NA NA NA NA NA NA NA NA
#> [57] NA NA NA NA NA NA NA NA
#> [65] NA NA NA NA 655.5997 612.2552 NA NA
#> [73] NA NA NA NA NA NA NA NA