i.ortho.transform1grass
Computes a coordinate transformation based on the control points.
Usage
i.ortho.transform
i.ortho.transform --help
i.ortho.transform [-srxp]
group=name
[format=string
[,string, ...]]
[coords=name]
[--help]
[--verbose]
[--quiet]
[--ui]
Keywords
imagery, orthorectify, transformation, GCP
Overview
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.
Notes
Ortho-transformation is a 2-step transformation. First, source coordinates are transformed to sensor coordinates, then sensor coordinates are transformed to target coordinates.
Todo
Update this document with x,y,z<->E,N,H information
Source code
Available at: i.ortho.transform source code (history)
Accessed: Monday Feb 24 17:51:39 2025
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© 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual
Releases
4 releases since Debian 10 (Buster); the text changed 3 times.