hello
i want to apply vegetation suppression using the forced invariance method on satellite images
as described in articles (a,b) to could get a better lithological mapping in strongly vegetated areas.
in these, the equation used as follow after plotting the NDVI vs band digital numbers:
Pnew = Poriginal × (Ptarget/PNDVI)
here, Pnew is the new pixel value, Poriginal is the original pixel value, Ptarget is the bandwise
target value and PNDVI is the corresponding NDVI value.
but i cant understand the Ptarget and how should i define that
in fact we have scatter plot showing the distribution of DN values for each band vs the calculated vegetation index e.g. NDVI like image below
a smooted curve is determined for that and used in equation to suppress the vegetation effect on pixel values
how should i define Ptarget in this equation
can anyone describe in more practical way how do i apply that
or how should i define Ptarget values for pixels
thanks previously
a: Crippen, R.; Blom, R. Unveiling the Lithology of Vegetated Terrains in Remotely Sensed Imagery. Photogramm. Eng. Remote Sens. 2006, 67, 935–943.
b: Yu, L.; Porwal, A.; Holden, E.-J.; Dentith, M.C. Suppression of vegetation in multispectral remote sensing images. Int. J. Remote Sens. 2011, 32, 7343–7357
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