r.latlong(1)

NAME
r.latlong - Creates a latitude/longitude raster map.

KEYWORDS
raster, latitude, longitude, projection

SYNOPSIS
r.latlong
r.latlong --help
r.latlong [-l] input=name output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]

  Flags:

-l
    Longitude output

--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 [required]
    Name for output latitude or longitude raster map

DESCRIPTION
r.latlong creates a latitude (degree decimal) map, or longitude if the -l flag is used, from any map in any projection using PROJ library. This is an input to r.sun and i.evapo.potrad.

NOTES
The PROJ website.

TODO
Datum transform is not implemented, the same datum is taken as output.

EXAMPLE

g.region raster=elevation -p
r.latlong input=elevation output=latitude

SEE ALSO
r.sun, r.sunhours

AUTHOR
Yann Chemin, International Rice Research Institute, The Philippines

SOURCE CODE

Available at: r.latlong source code (history)

Accessed: Monday May 11 17:54:09 2026

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