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brick {raster}

Create a RasterBrick object
Package: 
raster
Version: 
2.5-8

Description

A RasterBrick is a multi-layer raster object. They are typically created from a multi-layer (band) file; but they can also exist entirely in memory. They are similar to a RasterStack (that can be created with stack), but processing time should be shorter when using a RasterBrick. Yet they are less flexible as they can only point to a single file.

A RasterBrick can be created from RasterLayer objects, from a RasterStack, or from a (multi-layer) file. The can also be created from SpatialPixels*, SpatialGrid*, and Extent objects, and from a three-dimensional array.

Usage

 
## S4 method for class 'character':
brick((x, ...))

## S4 method for class 'RasterStack':
brick((x, values=TRUE, nl, filename=”, ...))

## S4 method for class 'RasterBrick':
brick((x, nl, ...))

## S4 method for class 'RasterLayer':
brick((x, ..., values=TRUE, nl=1, filename=”))

## S4 method for class 'missing':
brick((nrows=180, ncols=360, xmn=-180, xmx=180, ymn=-90, ymx=90, nl=1, crs))

## S4 method for class 'Extent':
brick((x, nrows=10, ncols=10, crs=NA, nl=1))

## S4 method for class 'array':
brick((x, xmn=0, xmx=1, ymn=0, ymx=1, crs=NA, transpose=FALSE))

## S4 method for class 'big.matrix':
brick((x, template, filename=”, ...))

## S4 method for class 'SpatialGrid':
brick((x))

## S4 method for class 'SpatialPixels':
brick((x))

Arguments

x
character (filename, see Details); Raster* object; missing; array; SpatialGrid*; SpatialPixels*; Extent; or list of Raster* objects. Supported file types are the 'native' raster package format and those that can be read via rgdal (see readGDAL), and NetCDF files (see details)
...
see Details
values
logical. If TRUE, the cell values of 'x' are copied to the RasterBrick object that is returned
nl
integer > 0. How many layers should the RasterBrick have?
filename
character. Filename if you want the RasterBrick to be saved on disk
nrows
integer > 0. Number of rows
ncols
integer > 0. Number of columns
xmn
minimum x coordinate (left border)
xmx
maximum x coordinate (right border)
ymn
minimum y coordinate (bottom border)
ymx
maximum y coordinate (top border)
crs
character or object of class CRS. PROJ4 type description of a Coordinate Reference System (map projection). If this argument is missing, and the x coordinates are withing -360 .. 360 and the y coordinates are within -90 .. 90, "+proj=longlat +datum=WGS84" is used
transpose
if TRUE, the values in the array are transposed
template
Raster* object used to set the extent, number of rows and columns and CRS

Details

If x is a RasterLayer, the additional arguments can be used to pass additional Raster* objects.

If there is a filename argument, the additional arguments are as for writeRaster. The big.matrix most have rows representing cells and columns representing layers.

If x represents a filename there is the following additional argument:

native: logical. If TRUE (not the default), reading and writing of IDRISI, BIL, BSQ, BIP, and Arc ASCII files is done with native (raster package) drivers, rather then via rgdal.

In addition, if x is a NetCDF filename there are the following additional arguments: varname: character. The variable name (e.g. 'altitude' or 'precipitation'. If not supplied and the file has multiple variables are a guess will be made (and reported))

lvar: integer > 0 (default=3). To select the 'level variable' (3rd dimension variable) to use, if the file has 4 dimensions (e.g. depth instead of time)

level: integer > 0 (default=1). To select the 'level' (4th dimension variable) to use, if the file has 4 dimensions, e.g. to create a RasterBrick of weather over time at a certain height.

To use NetCDF files the ncdf4 package needs to be available. It is assumed that these files follow, or are compatible with the CF-1 convention.

Values

RasterBrick

See Also

raster

Examples

b <- brick(system.file("external/rlogo.grd", package="raster"))
b
nlayers(b)
names(b)
extract(b, 870)

Documentation reproduced from package raster, version 2.5-8. License: GPL (>= 3)