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NAME

i.landsat.dehaze

DESCRIPTION

i.landsat.dehaze applies a bandwise haze correction using tasscap4 (haze) and linear regression.

NOTES

The regression based technique which determines a 'best fit' line for multispectral plots of pixels within homogenous cover types. The slope of the plot is proportional to the ratio of the reflective material (Crippen 1987).

EXAMPLE

# preparation of Tasseled Cap "haze" map
i.tasscap -7 band1=tm.10 band2=tm.20 band3=tm.30 band4=tm.40 \
             band5=tm.50 band7=tm.70 out=tasscap

# De-hazing
i.landsat.dehaze band1=tm.10 band2=tm.20 band3=tm.30 band4=tm.40 \
             band5=tm.50 band7=tm.70 tasscap4=tasscap.4 outprefix=dehaze

# color-balanced grey scales:
i.landsat.rgb blue=dehaze.1 green=dehaze.2 red=dehaze.3

# display as RGB composite
d.mon x0
d.rgb blue=dehaze.1 green=dehaze.2 red=dehaze.3

Original subset of Trentino, Italy (LANDSAT TM7, 13 Sep 1999). d.rgb view after i.landsat.rgb application.


Dehazed subset of Trentino, Italy (LANDSAT TM7, 13 Sep 1999). d.rgb view after i.tasscap, i.landsat.dehaze, i.landsat.rgb application.

SEE ALSO

d.rgb, g.region, i.landsat.rgb, i.tasscap, r.colors, r.composite, r.regression.line

AUTHOR

Markus Neteler

Last changed: $Date$

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