---
name: "r.latlong"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/r.latlong"
---

# r.latlong(1grass)

Creates a latitude/longitude raster map.

## 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 Feb 24 17:50:40 2025

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