I want to know what are the factors that effect on NDVI values during a year period.
i mean, not factors which vary spatially let say crop type, but i want to know the factors that affect on the same area over the time.
I think the crop leaf area profile, leaf surface texture and angle of attachment with stem in a crop canopy.
Many factors affect NDVI values, such as plant photosynthetic activity, biomass, plant and soil moisture, plant stress etc. You can say that its values represent state of vegetation condition (or health). Therefore, from a non-spatial perspective, anything that could alter vegetation condition could affect NDVI values.
Actually NDVI is estimated from ratios of PAR and NIR lights by the crop canopy i.e. the vegetation. When different crops and/or different varieties of a species is planted on a soil, both soil fertility and plant architecture i.e. planting geometry make differences in growth and vegetation over a unit ground area that differs in transmittance and reflectance of the radiation which change its NDVI.
https://www.researchgate.net/publication/309589918_Driving_force_for_forest_fragmentation_explored_by_land_use_change_in_Song_watershed_India
Article Driving force for forest fragmentation explored by land use ...
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