g.gui.photo2image(1)

NAME
g.gui.photo2image - Corrects scanning distortions of a paper photo.

KEYWORDS
imagery, GUI, aerial, photo, georectification, geometry, GCP

SYNOPSIS
g.gui.photo2image
g.gui.photo2image --help
g.gui.photo2image group=name raster=name camera=string order=string extension=string [--help] [--verbose] [--quiet] [--ui]

  Flags:

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

group=name [required]
    Name of input imagery group

raster=name [required]
    Name of input raster map

camera=string [required]
    The name of the camera (generated in i.ortho.camera)
    The name of the camera (generated in i.ortho.camera)

order=string [required]
    The rectification order (no of Fiducial=4 -> order=1, no of Fiducial=8 -> order=2)
    The rectification order (no of Fiducial=4 -> order=1, no of Fiducial=8 -> order=2)
    Default: 1

extension=string [required]
    The name of the output files extension (used in i.rectify)
    The name of the output files extension (used in i.rectify)
    Default: _ip2i_out

DESCRIPTION
This module is based on g.gui.gcp, the GCP manager of GRASS. It is part of i.ortho.photo suite.

The aim of this module is to give absolute location values to the fiducial points present (in number of 4 or 8) in a scanned aerial photo.

This is necessary as (manual) scanning introduces distortions, rotations and also may not be limited to scan the boundary of the photo itself. It is thus necessary to give to each fiducial the exact coordinates in mm as given by the aerial photographic instrument design, which is unique per camera.

This module requires you to have made a group with your aerial photo (i.group), a camera description file (i.ortho.target) and use them to launch the module. Additional requirements are the order of rectification (1 if no of Fiducials is 4, 2 if no of Fiducials is 8) and an extension file (if not given, defaults to \$filename_ip2i_out)

An example for project imagery60:

g.gui.photo2image group=aerial@PERMANENT raster=gs13.1@PERMANENT camera=gscamera order=2 extension=try --o

  Screenshot of g.gui.photo2image
Figure: Screenshot of g.gui.photo2image

For a detailed operation manual please read
wxGUI, wxGUI components

See also video tutorials on GRASS Wiki.

SEE ALSO
i.ortho.photo, i.group, i.ortho.camera, i.ortho.target, i.rectify, m.transform, v.rectify

AUTHORS
Markus Metz
Based on the Georectifier (GRASS 6.4.0) by Michael Barton
Martin Landa, Czech Technical University in Prague, Czech Republic

SOURCE CODE

Available at: wxGUI GCP Manager for photo to image registration source code (history)

Latest change: Wednesday Jan 28 08:16:26 2026 in commit: 0a9db34657dc4900ba35d6476b890c13d118c669

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