raster (version 1.0.0-1)

extremeValues: Minimum and maximum values

Description

Returns the minimum or maximum value of a RasterLayer or layer in a RasterStack

Usage

minValue(x, ...)
maxValue(x, ...)

Arguments

x

RasterLayer or RasterStack object

...

Additional argument: layer number (for RasterStack or RasterBrick objects)

Value

• a number

Details

If a Raster* object is created from a file on disk, the min and max values are often not known (depending on the file format). You can use setMinMax to set them in the Raster* object.

Examples

r <- raster()
r <- setValues(r, 1:ncell(r))
minValue(r)
maxValue(r)
r <- setValues(r, round(100 * runif(ncell(r)) + 0.5))
minValue(r)
maxValue(r)

r <- raster(system.file("external/test.grd", package="raster"))
# this raster is from an 'external' format, so min and maxValue are not known
minValue(r)
maxValue(r)

r1 <- setMinMax(r)
# now they are known:
minValue(r1)
maxValue(r1)

r2 <- readAll(r)
# now they are known too:
minValue(r2)
maxValue(r2)

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