.TH i.spectral 1grass "" "GRASS 8.3.2" "GRASS GIS User's Manual"
.SH NAME
\fI\fBi.spectral\fR\fR  \- Displays spectral response at user specified locations in group or images.
.SH KEYWORDS
imagery, querying, raster, multispectral
.SH SYNOPSIS
\fBi.spectral\fR
.br
\fBi.spectral \-\-help\fR
.br
\fBi.spectral\fR [\-\fBcgt\fR]  [\fBgroup\fR=\fIname\fR]   [\fBsubgroup\fR=\fIname\fR]   [\fBraster\fR=\fIname\fR[,\fIname\fR,...]]  \fBcoordinates\fR=\fIeast,north\fR[,\fIeast,north\fR,...]  [\fBoutput\fR=\fIname\fR]   [\fBformat\fR=\fIstring\fR]   [\-\-\fBoverwrite\fR]  [\-\-\fBhelp\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR]  [\-\-\fBui\fR]
.SS Flags:
.IP "\fB\-c\fR" 4m
.br
Show sampling coordinates instead of numbering in the legend (valid for \-g flag)
.IP "\fB\-g\fR" 4m
.br
Use gnuplot for display
.IP "\fB\-t\fR" 4m
.br
output to text file
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-help\fR" 4m
.br
Print usage summary
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.IP "\fB\-\-ui\fR" 4m
.br
Force launching GUI dialog
.SS Parameters:
.IP "\fBgroup\fR=\fIname\fR" 4m
.br
Name of input imagery group
.IP "\fBsubgroup\fR=\fIname\fR" 4m
.br
Name of input imagery subgroup
.IP "\fBraster\fR=\fIname[,\fIname\fR,...]\fR" 4m
.br
Name of input raster map(s)
.IP "\fBcoordinates\fR=\fIeast,north[,\fIeast,north\fR,...]\fR \fB[required]\fR" 4m
.br
Coordinates
.IP "\fBoutput\fR=\fIname\fR" 4m
.br
Name for output image is valid for \-g (or text file for \-t flag)
.IP "\fBformat\fR=\fIstring\fR" 4m
.br
Graphics format for output file (valid for \-g flag)
.br
Options: \fIpng, eps, svg\fR
.br
Default: \fIpng\fR
.SH DESCRIPTION
\fIi.spectral\fR displays spectral response at user specified
locations in images.
.SH NOTES
This script requires the launch of one of the supported monitors (cairo, png, ps) or gnuplot to be installed.
.SH EXAMPLE
Analysis of LANDSAT TM7 channels (North Carolina dataset):
.br
.nf
\fC
g.region raster=lsat7_2002_10 \-p
i.spectral \-g raster=lsat7_2002_10,lsat7_2002_20,lsat7_2002_30,lsat7_2002_40,lsat7_2002_50,lsat7_2002_70 \(rs
           coordinates=636069,215440,637958,223393,633277,223605
\fR
.fi
.br
Spectral plot of 3 different land cover types: (1) water, (2) green vegetation, and (3) highway
.PP
North Carolina sample dataset:
.br
.nf
\fC
g.region raster=lsat7_2002_10 \-p
LIST=\(gag.list type=raster pattern=\(dqlsat7_2002_[1\-5,7]0\(dq separator=\(dq,\(dq\(ga
d.mon start=cairo output=plot.png
i.spectral raster=$LIST coordinates=637502.25,221744.25
d.mon stop=cairo
\fR
.fi
This will search all LANDSAT map for 2002 but select only the B, G, R,
NIR, and MIR channels.
.SH SEE ALSO
\fI
d.where,
r.what,
Cairo driver,
PNG driver,
PS driver (Postscript)
\fR
.SH AUTHORS
Markus Neteler
.br
Francesco Pirotti
.SH SOURCE CODE
.PP
Available at:
i.spectral source code
(history)
.PP
Accessed: Thursday Mar 07 18:16:12 2024
.PP
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.PP
© 2003\-2024
GRASS Development Team,
GRASS GIS 8.3.2 Reference Manual