r.out.ascii.1grass - Man Page
Converts a raster map layer into a GRASS ASCII text file.
Keywords
raster, export, output, ASCII, Surfer, Modflow, Lisflood
Synopsis
r.out.ascii
r.out.ascii --help
r.out.ascii [-hsmli] input=name [output=name] [precision=integer] [width=integer] [null_value=string] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags
- -h
Suppress printing of header information
- -s
Write SURFER (Golden Software) ASCII grid
- -m
Write MODFLOW (USGS) ASCII array
- -l
Write LISFLOOD (EU) ASCII array
- -i
Force output of integer values
- --overwrite
Allow output files to overwrite existing files
- --help
Print usage summary
- --verbose
Verbose module output
- --quiet
Quiet module output
- --ui
Force launching GUI dialog
Parameters
- input=name [required]
Name of input raster map
- output=name
Name for output ASCII grid map (use out=- for stdout)
- precision=integer
Number of significant digits (floating point only)
- width=integer
Number of values printed before wrapping a line (only SURFER or MODFLOW format)
- null_value=string
String to represent null cell (GRASS grid only)
Default: *
Description
r.out.ascii converts a user-specified raster map layer (input=name) into an ASCII grid in a text file (output=name) suitable for export to other computer systems.
The GRASS program r.in.ascii can be used to perform the reverse function, converting an ASCII file in suitable format to GRASS raster map format.
To write a SURFER .grd ASCII GRID file (with reverted row order and different header) use the -s flag:
r.out.ascii -s input=inname output=outname.grd [dp=value]
NULL data are coded to "1.70141e+038" for SURFER ASCII GRID files (ignoring the null= parameter).
To write a LISFLOOD .dem ASCII GRID file (with different header) use the -l flag:
r.out.ascii -l input=inname output=outname.dem
NULL data output are set by the user at "-9999" in this case, see below:
ncols 1514 nrows 2747 xllcorner 212236 yllcorner 2910116 cellsize 120 NODATA_value -9999
Notes
The output from r.out.ascii may be placed into a file by using the UNIX redirection mechanism; e.g.:
r.out.ascii input=soils output=- > out.file
The output file out.file can then be printed or copied onto a CDROM or floppy disk for export purposes.
To export the raster values as x,y,z values of cell centers (one per line) use the r.out.xyz module.
See Also
r.in.ascii, r.in.gdal, r.out.bin, r.out.gdal, r.out.xyz
Authors
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
Surfer support by Markus Neteler
Source Code
Available at: r.out.ascii source code (history)
Latest change: Sunday Oct 05 01:26:10 2025 in commit: 14fd3ee61b78346fc901c0aa1d874c83c16cc51a
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© 2003-2026 GRASS Development Team, GRASS 8.5.0 Reference Manual