Information for Sensor and Index

Formula

General Formula	$(n (1 - 0.25 n) - \frac{RED - 0.125}{1 - RED})$
Specific Formula	$(\frac{2 ({NIR2}^{2} - {VIS2}^{2}) + 1.5 NIR2 + 0.5 VIS2}{NIR2 + VIS2 + 0.5} (1 - 0.25 \frac{2 ({NIR2}^{2} - {VIS2}^{2}) + 1.5 NIR2 + 0.5 VIS2}{NIR2 + VIS2 + 0.5}) - \frac{VIS2 - 0.125}{1 - VIS2})$
Calculated	Automatic
Comment

Sensor

Name	SCIAMACHY
Full Name	Scanning Imaging Absorption Spectrometer for Atmospheric Chartography
Bands	15
Spectrum [nm]	240-2380
Spat.Res. [m]	960000-960000
Inclination	0
Platform	ENVISAT
Operator	ESA
Date of Launch	0000-00-00
Comment
Usable for Indices	yes
Description

Index

Name	Global Environment Monitoring Index
Abbreviation	GEMI
Formula	$(n (1 - 0.25 n) - \frac{RED - 0.125}{1 - RED})$
Variables	n = ( 2 * ( NIR ^2 - RED ^2) + 1.5 * NIR + 0.5 * RED ) / ( NIR + RED + 0.5 )
Expl. of Variables
Wavelengths	640:760,780:1400
Source	Original formula
Description	Bannari 1996

References

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Index