table of contents
i.ortho.transform(1grass) | GRASS GIS User's Manual | i.ortho.transform(1grass) |
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 [-srxp] 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 - -p
-
Enable panorama camera correction - --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
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
SOURCE CODE¶
Available at: i.ortho.transform source code (history)
Accessed: Saturday Jul 27 17:09:07 2024
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