GRASS GIS manual: r3.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Note: This document is for an older version of GRASS GIS that is outdated.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

r3.out.ascii - Converts a 3D raster map layer into an ASCII text file.

KEYWORDS

raster3d, voxel, export

SYNOPSIS

r3.out.ascii
r3.out.ascii help
r3.out.ascii [-hm] input=string [output=string] [dp=integer] [null=string] [--verbose] [--quiet]

Flags:

-h: Suppress printing of header information
-m: Use 3D raster mask (if exists) with input map
--verbose: Verbose module output
--quiet: Quiet module output

Parameters:

input=string: 3D raster map to be converted to ASCII
output=string: Name for ASCII output file
dp=integer: Number of decimal places for floats; Options: 0-20; Default: 8
null=string: Char string to represent no data cell; Default: *

DESCRIPTION

Outputs 3D raster maps in ASCII format. The map parameter is a valid 3D raster map in the current mapset search path. The output parameter is the name of an ASCII file which will be written in the current working directory.

If output is not specified then standard output (stdout) is used. The -h flag may be used to suppress header information. The module is sensitive to region settings (set with g.region).

NOTES

The default format for the ASCII file is equivalent to that required by r3.in.ascii. In particular, files output by r3.out.ascii with header information may be converted back to 3D raster maps with r3.in.ascii.

The format of the ASCII file is:

north:   floating point
south:   floating point
east:    floating point
west:    floating point
top:     floating point
bottom:  floating point
rows:    integer
cols:    integer
levels:  integer

The header is followed by cell values in floating point format. Cell values are output as a series of horizontal slices in row-major order. That is,

  (x, y, z)       (x + 1, y, z)     ...     (x + cols, y, z)
(x, y + 1, z)   (x + 1, y + 1, z)   ...   (x + cols, y + 1, z)

and so on.

One level maps can be imported with r.in.ascii (2D raster) after removing the header lines "top", "bottom" and "levels".

AUTHORS

Roman Waupotitsch, Michael Shapiro, Helena Mitasova, Bill Brown, Lubos Mitas, Jaro Hofierka

Last changed: $Date: 2011-09-13 13:14:59 -0700 (Tue, 13 Sep 2011) $

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