I used these modis products (MOD09A1 and MOD09Q1) to find NDVI but the ranges of NDVI for my region is (-0.76 to 0.859) and (-0.53 to 0.881) now the scale factor which is mentioned in product description is 0.0001. Should I have to multiply these values from the scale factor or i can directly used these values??any help would be appreciated.