.TH i.ortho.transform 1grass "" "GRASS 7.8.5" "GRASS GIS User's Manual"
.SH NAME
\fI\fBi.ortho.transform\fR\fR  \- Computes a coordinate transformation based on the control points.
.SH KEYWORDS
imagery, orthorectify, transformation, GCP
.SH SYNOPSIS
\fBi.ortho.transform\fR
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\fBi.ortho.transform \-\-help\fR
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\fBi.ortho.transform\fR [\-\fBsrx\fR] \fBgroup\fR=\fIname\fR  [\fBformat\fR=\fIstring\fR[,\fIstring\fR,...]]   [\fBcoords\fR=\fIname\fR]   [\-\-\fBhelp\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR]  [\-\-\fBui\fR]
.SS Flags:
.IP "\fB\-s\fR" 4m
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Display summary information
.IP "\fB\-r\fR" 4m
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Reverse transform of coords file or coeff. dump
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Target east,north,height coordinates to local x,y,z
.IP "\fB\-x\fR" 4m
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Display transform matrix coefficients
.IP "\fB\-\-help\fR" 4m
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Print usage summary
.IP "\fB\-\-verbose\fR" 4m
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Verbose module output
.IP "\fB\-\-quiet\fR" 4m
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Quiet module output
.IP "\fB\-\-ui\fR" 4m
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Force launching GUI dialog
.SS Parameters:
.IP "\fBgroup\fR=\fIname\fR \fB[required]\fR" 4m
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Name of input imagery group
.IP "\fBformat\fR=\fIstring[,\fIstring\fR,...]\fR" 4m
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Output format
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Options: \fIidx, src, dst, fwd, rev, fxy, rxy, fd, rd\fR
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Default: \fIfd,rd\fR
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\fBidx\fR: point index
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\fBsrc\fR: source coordinates
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\fBdst\fR: destination coordinates
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\fBfwd\fR: forward coordinates (destination)
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\fBrev\fR: reverse coordinates (source)
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\fBfxy\fR: forward coordinates difference (destination)
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\fBrxy\fR: reverse coordinates difference (source)
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\fBfd\fR: forward error (destination)
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\fBrd\fR: reverse error (source)
.IP "\fBcoords\fR=\fIname\fR" 4m
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File containing coordinates to transform (\(dq\-\(dq to read from stdin)
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Local x,y,z coordinates to target east,north,height
.SH DESCRIPTION
\fIi.ortho.transform\fR is an utility to compute transformation
based upon GCPs and output error measurements.
.PP
If coordinates are given with the \fBinput\fR file option or fed from
stdin, both the input and the output format is \(dqx y z\(dq with one
coordinate pair per line. Reverse transform is performed with the
\fB\-r\fR flag.
.PP
The \fBformat\fR option determines how control points are printed out.
A summary on the control points can be printed with the \fB\-s\fR flag.
The summary includes maximum deviation observed when transforming GCPs
and overall RMS. The \fBformat\fR option is ignored when coordinates
are given with the \fBinput\fR file option.
.SH NOTES
Ortho\-transformation is a 2\-step transformation. First, source
coordinates are transformed to sensor coordinates, then sensor
coordinates are transformed to target coordinates.
.SH SEE ALSO
\fIi.rectify\fR
.SH TODO
Update this document with x,y,z<\->E,N,H information
.SH AUTHORS
Brian J. Buckley
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Glynn Clements
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Hamish Bowman
.SH SOURCE CODE
.PP
Available at: i.ortho.transform source code (history)
.PP
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.PP
© 2003\-2020
GRASS Development Team,
GRASS GIS 7.8.5 Reference Manual