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NAME

i.ortho.transform - Computes a coordinate transformation based on the control points.

KEYWORDS

imagery, orthorectify, transformation, GCP

SYNOPSIS

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

Flags:

-s
Display summary information
-r
Reverse transform of coords file or coeff. dump
Target east,north,height coordinates to local x,y,z
-x
Display transform matrix coefficients
--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
format=string[,string,...]
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)
coords=name
File containing coordinates to transform ("-" to read from stdin)
Local x,y,z coordinates to target east,north,height

Table of contents

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

Last changed: $Date: 2018-03-14 03:57:02 -0700 (Wed, 14 Mar 2018) $

SOURCE CODE

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


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© 2003-2018 GRASS Development Team, GRASS GIS 7.7.svn Reference Manual