DESCRIPTION

i.spectral displays spectral response at user specified locations in images.

NOTES

This script needs gnuplot to be installed.

EXAMPLES

Analysis of LANDSAT TM7 channels (North Carolina dataset): 
g.region rast=lsat7_2002_10 -p
d.mon x0
d.rast lsat7_2002_40
i.spectral -i rast=lsat7_2002_10,lsat7_2002_20,lsat7_2002_30,lsat7_2002_40,lsat7_2002_50,lsat7_2002_70

Spectral plot of 3 different land cover types: (1) water, (2) green vegetation, and (3) highway

To analyze a time series of maps, use: 

d.rast map_1
LIST=`g.mlist type=rast mapset=timeseries pat="map_*" | sort -t '_' -k 2 -n | tr '\n' ','| sed 's+,$++g'`
i.spectral -i rast=$LIST
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.

SEE ALSO

d.what.rast
d.where
r.what

AUTHOR

Markus Neteler
Francesco Pirotti

Last changed: $Date$