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\name{hdr}
\alias{hdr}
\title{Header files}
\description{
Write header files to use together with raster binary files to read the data in other applications.
}
\usage{
hdr(x, format, extension='.wld', filename='')
}
\arguments{
\item{x}{RasterLayer or RasterBrick object associated with a binary values file on disk }
\item{format}{Type of header file: 'VRT', 'BIL', 'ENVI', 'ErdasRaw', 'IDRISI', 'SAGA', 'RASTER', 'WORLDFILE', 'PRJ' }
\item{extension}{File extension, only used with an ESRI worldfile (\code{format='WORLDFILE'})}
\item{filename}{character. Need to be provided if \code{x} is not associated with a file}
}
\details{
The RasterLayer object must be associated with a file on disk.
You can use \code{\link{writeRaster}} to save a existing file in another format. But if you have a file in a 'raster' format (or similar), you can also only export a header file,
and use the data file (.gri) that already exists. The function can write a VRT (GDAL virtual raster) header (.vrt); an ENVI or BIL header (.hdr) file; an Erdas Raw (.raw) header file; an IDRISI (.rdc) or SAGA (.sgrd).
This (hopefully) allows for reading the binary data (.gri), perhaps after changing the file extension, in other programs such as ENVI or ArcGIS.
}
\seealso{ \code{\link[raster]{writeRaster}}}
\examples{
\dontrun{
r <- raster(system.file("external/test.grd", package="raster"))
r <- writeRaster(r, filename='export.grd', overwrite=TRUE)
hdr(r, format="ENVI")
}
}
\keyword{ spatial }
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