.TH i.spectral 1grass "" "GRASS 6.4.2" "Grass User's Manual"
.SH NAME
\fI\fBi.spectral\fR\fR  - Displays spectral response at user specified locations in group or images.
.SH KEYWORDS
imagery, raster, multispectral
.SH SYNOPSIS
\fBi.spectral\fR
.br
\fBi.spectral help\fR
.br
\fBi.spectral\fR [-\fBimc\fR]  [\fBgroup\fR=\fIstring\fR]   [\fBraster\fR=\fIstring\fR[,\fIstring\fR,...]]   [\fBoutput\fR=\fIstring\fR]   [--\fBverbose\fR]  [--\fBquiet\fR] 
.SS Flags:
.IP "\fB-i\fR" 4m
.br
Use image list and not group
.IP "\fB-m\fR" 4m
.br
Select multiple points
.IP "\fB-c\fR" 4m
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Label with coordinates instead of numbering
.IP "\fB--verbose\fR" 4m
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Verbose module output
.IP "\fB--quiet\fR" 4m
.br
Quiet module output
.PP
.SS Parameters:
.IP "\fBgroup\fR=\fIstring\fR" 4m
.br
Group input
.IP "\fBraster\fR=\fIstring[,\fIstring\fR,...]\fR" 4m
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Raster input maps
.IP "\fBoutput\fR=\fIstring\fR" 4m
.br
Write output to PNG image
.PP
.SH DESCRIPTION
\fIi.spectral\fR displays spectral response at user specified 
locations in images.
.SH NOTES
This script needs gnuplot to be installed.
.SH EXAMPLE
To analyze a time series of maps, run:
\fC
.DS
.br
d.rast map_1
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LIST=\(gag.mlist type=rast mapset=timeseries pat="map_*" | sort -t '_' -k 2 -n | tr '\(rsn' ','| sed 's+,$++g'\(ga
.br
i.spectral -i rast=$LIST
.br
.DE
\fR
This will search all maps in the mapset 'timeseries' which match have
the 'map_' prefix and order by a number following this prefix (day of the
year etc). The user is then asked to click into a map position and the
resulting pixel values of all matching maps are drawn in the gnuplot
output.
.SH SEE ALSO
\fId.what.rast\fR
.br
\fId.where\fR
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\fIr.what\fR
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.SH AUTHOR
Markus Neteler
.br
Francesco Pirotti
.PP
\fILast changed: $Date: 2011-11-08 10:42:51 +0100 (Tue, 08 Nov 2011) $\fR
.PP
Full index
.PP
© 2003-2011 GRASS Development Team