## DESCRIPTION

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.

## SEE ALSO

i.rectify

## TODO

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

## AUTHORS

Brian J. Buckley
Glynn Clements
Hamish Bowman