Dear all,


Im currently doing my research in NDVI index.

As some of you might know the NDVI forumula is based as following

NDVI = (NIR-VIS)/(NIR+VIS)

Where
NIR = the ratio of reflected light/incomming light near infrared (NIRref / NIRin)
VIS = the ratio of reflected light / incomming light Visible (VISref/VISin)

about a year ago i mathematically constructed the following formula

NDVI = ((VISin/NIRin) * (NIR-VIS)) / ((VISin/NIRin) *(NIR+VIS) )

I know this is mathematically correct. however ofcours i lost my notes.
and i cannot find the way is solved it last time.

Can anyone help me with this?

Thanks in advanced!

Ralf Smit