i.ortho.transform.1grass - Man Page

Computes a coordinate transformation based on the control points.


imagery, orthorectify, transformation, GCP


i.ortho.transform --help
i.ortho.transform [-srxp] group=name  [format=string[,string,...]]   [coords=name]   [--help]  [--verbose]  [--quiet]  [--ui]



Display summary information


Reverse transform of coords file or coeff. dump
Target east,north,height coordinates to local x,y,z


Display transform matrix coefficients


Enable panorama camera correction


Print usage summary


Verbose module output


Quiet module output


Force launching GUI dialog


group=name [required]

Name of input imagery group


Output format
Options: idx, src, dst, fwd, rev, fxy, rxy, fd, rd
Default: fd,rd
idx: point index
src: source coordinates
dst: destination coordinates
fwd: forward coordinates (destination)
rev: reverse coordinates (source)
fxy: forward coordinates difference (destination)
rxy: reverse coordinates difference (source)
fd: forward error (destination)
rd: reverse error (source)


File containing coordinates to transform ("-" to read from stdin)
Local x,y,z coordinates to target east,north,height


i.ortho.transform is an utility to compute transformation based upon GCPs and output error measurements.

If coordinates are given with the input file option or fed from stdin, both the input and the output format is "x y z" with one coordinate pair per line. Reverse transform is performed with the -r flag.

The format option determines how control points are printed out. A summary on the control points can be printed with the -s flag. The summary includes maximum deviation observed when transforming GCPs and overall RMS. The format option is ignored when coordinates are given with the input file option.


Ortho-transformation is a 2-step transformation. First, source coordinates are transformed to sensor coordinates, then sensor coordinates are transformed to target coordinates.

See Also



Update this document with x,y,z<->E,N,H information


Brian J. Buckley
Glynn Clements
Hamish Bowman

Source Code

Available at: i.ortho.transform source code (history)

Accessed: Tuesday Mar 19 11:02:31 2024

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