r.out.xyz.1grass man page

r.out.xyz — Exports a raster map to a text file as x,y,z values based on cell centers.


raster, export, ASCII, conversion


r.out.xyz --help
r.out.xyz input=name[,name,...] [output=name] [separator=character] [--overwrite] [--help] [--verbose] [--quiet] [--ui]


Allow output files to overwrite existing files
Print usage summary
Verbose module output
Quiet module output
Force launching GUI dialog


input=name[,name,...] [required]
Name of input raster map(s)
Name for output file (if omitted or "-" output to stdout)
Field separator
Special characters: pipe, comma, space, tab, newline
Default: pipe


The r.out.xyz module exports a raster map as a list of x,y,z values into an ASCII text file.


This module will not export x,y coordinates for raster cells containing a NULL value. This includes cells masked by a raster MASK.

This module, as all GRASS raster modules, will export cells based on the current region settings. See the g.region module for details.

The r.out.ascii module should be used to export an array (of size row x column) containing z values.

r.out.xyz can combine several input raster maps, which can be convenient when it comes to e.g. produce ASCII point cloud files.

r.out.xyz is simply a front-end to "r.stats -1gn".


In this example, a LiDAR elevation map in the North Carolina sample dataset location is exported to CSV format.

g.region raster=elev_lid792_1m -p
r.out.xyz input=elev_lid792_1m output=elev_lid792_1m.csv separator=","

In this example, elevation data from the North Carolina dataset are exported along with R,G,B triplet of the related orthophoto into a combined file (requires the import of the supplementary high-resolution color orthophoto, here called "ortho2010_t792"):

g.region raster=elev_lid792_1m res=1 -a -p
r.out.xyz input=elev_lid792_1m,ortho2010_t792.red,ortho2010_t792.green,ortho2010_t792.blue \
        separator=space output=pointcloud.asc
# validate: X Y Z R G B
head -n 3 pointcloud.asc
638300.5 220749.5 126.338218689 78 84 71
638301.5 220749.5 126.3381958008 93 101 86
638302.5 220749.5 126.3414840698 68 77 59


Implement this script as a r.out.ascii option?

See Also

g.region, r.mask r.out.ascii, r.stats


M. Hamish Bowman
Dept. Marine Science
Otago University, New Zealand

Last changed: $Date: 2014-12-19 22:55:37 +0100 (Fri, 19 Dec 2014) $

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