TSAVI

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TSAVI (Transformed Soil Adjusted Vegetation Index)


Calculation:

TSAVI = (s * (NIR - s * R - a)) / (a * NIR + R - a * s + X * (1 + s^2))
with s = soil line slope,
a = soil line intercept,
X = adjustment factor


Characteristics:

ratio-based index,
limited range -1<TSAVI<1,
adjusted by soil line (a) and slope (s),
“effect of soil background minimized by X” (0.08 in first paper)


Reference:

Baret F., Guyot G., Major D., 1989. TSAVI: a vegetation index which minimizes soil brightness effects on LAI or APAR estimation. 12th Canadian Symposium on Remote Sensing and IGARSS 1990, Vancouver, Canada, 07/10-14