NAME
i.spectral - Displays spectral response at user specified locations in group or images.
KEYWORDS
imagery,
querying,
raster,
multispectral
SYNOPSIS
i.spectral
i.spectral --help
i.spectral [-cgt] [group=name] [subgroup=name] [raster=name[,name,...]] coordinates=east,north[,east,north,...] [output=name] [format=string] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -c
- Show sampling coordinates instead of numbering in the legend (valid for -g flag)
- -g
- Use gnuplot for display
- -t
- output to text file
- --overwrite
- Allow output files to overwrite existing files
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- group=name
- Name of input imagery group
- subgroup=name
- Name of input imagery subgroup
- raster=name[,name,...]
- Name of input raster map(s)
- coordinates=east,north[,east,north,...] [required]
- Coordinates
- output=name
- Name for output image is valid for -g (or text file for -t flag)
- format=string
- Graphics format for output file (valid for -g flag)
- Options: png, eps, svg
- Default: png
i.spectral displays spectral response at user specified
locations in images.
This script requires the launch of one of the supported monitors (cairo, png, ps) or gnuplot to be installed.
Analysis of LANDSAT TM7 channels (North Carolina dataset):
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 \
coordinates=636069,215440,637958,223393,633277,223605
Spectral plot of 3 different land cover types: (1) water, (2) green vegetation, and (3) highway
North Carolina sample dataset:
g.region raster=lsat7_2002_10 -p
LIST=`g.list type=raster pattern="lsat7_2002_[1-5,7]0" separator=","`
d.mon start=cairo output=plot.png
i.spectral raster=$LIST coordinates=637502.25,221744.25
d.mon stop=cairo
This will search all LANDSAT map for 2002 but select only the B, G, R,
NIR, and MIR channels.
d.where,
r.what,
Cairo driver,
PNG driver,
PS driver (Postscript)
Markus Neteler
Francesco Pirotti
SOURCE CODE
Available at:
i.spectral source code
(history)
Latest change: Monday Feb 27 13:45:25 2023 in commit: a82501dc85294207e8e58437c3ec7f1056465ed4
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© 2003-2024
GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual