writeRaster.RdWrite an entire Raster* object to a file, using one of the many supported formats. See writeValues for writing in chunks (e.g. by row).
When writing a file to disk, the file format is determined by the 'format=' argument if supplied, or else by the file extension (if the extension is known). If other cases the default format is used. The default format is 'raster', but this setting can be changed (see rasterOptions).
# S4 method for class 'RasterLayer,character'
writeRaster(x, filename, format, ...)
# S4 method for class 'RasterStackBrick,character'
writeRaster(x, filename, format, bylayer, suffix='numbers', ...)Raster* object
Output filename
Character. Output file type. See writeFormats. If this argument is not provided, it is attempted to infer it from the filename extension. If that fails, the default format is used. The default format is 'raster', but this can be changed using rasterOptions
Additional arguments:
datatype: Character. Output data type (e.g. 'INT2S' or 'FLT4S'). See dataType. If no datatype is specified, 'FLT4S' is used, unless this default value was changed with rasterOptions
overwrite: Logical. If TRUE, "filename" will be overwritten if it exists
progress: Character. Set a value to show a progress bar. Valid values are "text" and "window".
NAflag: Numeric. To overwrite the default value used to represent NA in a file
bandorder: Character. 'BIL', 'BIP', or 'BSQ'. For 'native' file formats only.
For some other formats you can use the 'options' argument (see below)
options: Character. File format specific GDAL options. E.g., when
writing a geotiff file you can use: options=c("COMPRESS=NONE", "TFW=YES")
You can use options=c("PROFILE=BASELINE") to create a plain tif with no GeoTIFF tags. This can be useful when writing files to be read by applications intolerant of unrecognised tags.
NetCDF files have the following additional, optional, arguments: varname, varunit, longname, xname, yname, zname, zunit
prj: Logical. If TRUE, the crs is written to a .prj file. This can be useful
when writing to an ascii file or another file type that does not store the crs
setStatistics: logical. If TRUE (the default) the min and max cell values are written to file (if the format permits it)
if TRUE, write a separate file for each layer. You can provide a vector of filenames that matches the number of layers. Or you can provide a single filename that will get a unique suffix (see below)
'numbers' or 'names' to determine the suffix that each file gets when bylayer=TRUE; either a number between 1 and nlayers(x) or names(x)
See writeFormats for supported file types ("formats", "drivers").
In multi-layer files (i.e. files saved from RasterStack or RasterBrick objects), in the native 'raster' format, the band-order can be set to BIL ('Bands Interleaved by Line'), BIP ('Bands Interleaved by Pixels') or BSQ ('Bands SeQuential'). Note that bandorder is not the same as filetype here.
Supported file types include:
| File type | Long name | default extension | Multiband support | |
raster | 'Native' raster package format | .grd | Yes | |
ascii | ESRI Ascii | .asc | No | |
SAGA | SAGA GIS | .sdat | No | |
IDRISI | IDRISI | .rst | No | |
CDF | netCDF (requires ncdf4) | .nc | Yes | |
GTiff | GeoTiff | .tif | Yes | |
ENVI | ENVI .hdr Labelled | .envi | Yes | |
EHdr | ESRI .hdr Labelled | .bil | Yes | |
HFA | Erdas Imagine Images (.img) | .img | Yes |
This function is used for the side-effect of writing values to a file.
tmp <- tempdir()
r <- raster(system.file("external/test.grd", package="raster"))
# take a small part
r <- crop(r, extent(179880, 180800, 329880, 330840) )
# write to an integer binary file
rf <- writeRaster(r, filename=file.path(tmp, "allint.grd"), datatype='INT4S', overwrite=TRUE)
# make a brick and save multi-layer file
b <- brick(r, sqrt(r))
bf <- writeRaster(b, filename=file.path(tmp, "multi.grd"), bandorder='BIL', overwrite=TRUE)
# write to a new geotiff file
rf <- writeRaster(r, filename=file.path(tmp, "test.tif"), format="GTiff", overwrite=TRUE)
bf <- writeRaster(b, filename=file.path(tmp, "multi.tif"),
options="INTERLEAVE=BAND", overwrite=TRUE)
# write to netcdf
if (require(ncdf4)) {
rnc <- writeRaster(r, filename=file.path(tmp, "netCDF.nc"), format="CDF", overwrite=TRUE)
}
#> Loading required package: ncdf4