NAME¶
i.spectral - Displays spectral response at user specified
locations in group or images.
KEYWORDS¶
imagery, raster, multispectral
SYNOPSIS¶
i.spectral
i.spectral help
i.spectral [-
imc] [
group=
string]
[
raster=
string[,
string,...]]
[
output=
string] [--
overwrite] [--
verbose]
[--
quiet]
Flags:¶
- -i
-
Use image list and not group
- -m
-
Select multiple points
- -c
-
Show pick coordinates instead of numbering in the legend
- --overwrite
-
Allow output files to overwrite existing files
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
Parameters:¶
- group=string
-
Group input
- raster=string[,string,...]
-
Raster input maps
- output=string
-
Write output to PNG image
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: 2012-08-20 12:35:34 +0200 (Mon, 20 Aug 2012) $
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