kndvi#
- geowombat.kndvi(data, nodata=None, mask=False, sensor=None, scale_factor=None)#
Calculates the kernel normalized difference vegetation index
- Parameters:
data (DataArray) – The
xarray.DataArray
to process.nodata (Optional[int or float]) – A ‘no data’ value to fill NAs with. If
None
, the ‘no data’ value is taken from thexarray.DataArray
attributes.mask (Optional[bool]) – Whether to mask the results.
sensor (Optional[str]) – The data’s sensor. If
None
, the band names should reflect the index being calculated.scale_factor (Optional[float]) – A scale factor to apply to the data. If
None
, the scale value is taken from thexarray.DataArray
attributes.
Equation:
\[kNDVI = tanh({NDVI}^2)\]- Reference:
- Returns:
Data range: -1 to 1
- Return type:
xarray.DataArray
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Zhangyan Jiang, Alfredo R Huete, Kamel Didan, and Tomoaki Miura. Development of a two-band enhanced vegetation index without a blue band. Remote sensing of Environment, 112(10):3833–3845, 2008.
Eric A Lehmann, Jeremy F Wallace, Peter A Caccetta, Suzanne L Furby, and Katherine Zdunic. Forest cover trends from time series Landsat data for the Australian continent. International Journal of Applied Earth Observation and Geoinformation, 21:453–462, 2013.