<put algortithm description here>
Near Infrared Band
[raster]Red Band
[raster]Normalized Difference Vegetation Index
[raster]Ratio Vegetation Index
[raster]Transformed Vegetation Index
[raster]Corrected Transformed Vegetation Index
[raster]Thiam's Transformed Vegetation Index
[raster]Normalized Ratio Vegetation Index
[raster]processing.runalg('saga:vegetationindexslopebased', nir, red, ndvi, ratio, tvi, ctvi, ttvi, nratio)