GRASS GIS manual: r.out.ascii

Note: This document is for an older version of GRASS GIS that is outdated. You should upgrade, and read the current manual page.

NAME

r.out.ascii - Converts a raster map layer into an ASCII text file.

KEYWORDS

raster, export

SYNOPSIS

r.out.ascii
r.out.ascii help
r.out.ascii [-hsmi] input=string [output=string] [dp=integer] [width=integer] [null=string] [--verbose] [--quiet]

Flags:

-h: Suppress printing of header information
-s: Write SURFER (Golden Software) ASCII grid
-m: Write MODFLOW (USGS) ASCII array
-i: Force output of integer values
--verbose: Verbose module output
--quiet: Quiet module output

Parameters:

input=string: Name of an existing raster map
output=string: Name for output ASCII grid map (use out=- for stdout)
dp=integer: Number of significant digits (floating point only)
width=integer: Number of values printed before wrapping a line (only SURFER or MODFLOW format)
null=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).

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.

AUTHOR

Michael Shapiro, U.S. Army Construction Engineering Research Laboratory

Surfer support by Markus Neteler

Last changed: $Date: 2008-05-16 12:09:06 -0700 (Fri, 16 May 2008) $

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