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A Secret Formula to Calculate NDVI Pixel Values

The calculation of normalized difference vegetation index (better known as “NDVI”) of a particular location – it is not always an easy and straightforward task. Indeed, in such cases, it is important to pay attention not only on the pixels that fall within the geodetic chain (it is fully marked milestones in the pictures and maps).

Also, it is necessary to focus on the areas, where the pixels are captured in part. How do the calculation pixel NDVI in such cases?

There are two important points in the solution of this problem.

Fragment of NDVI map (without NDVI Pixel values). Photo credit: precisionagricultu.re
Fragment of the NDVI map / precisionagricultu.re

Firstly, the main rule – the calculation is only in integer pixels. Though, undoubtedly, the role of the average NDVI pixel values essentially depend on the software being used. Also, be aware that in the case of mapping large areas, the result of a calculation is also affected by the map projection image.
Secondly, the need to focus on the fact that under ideal conditions when calculating a pixel average, the weight of the pixel must be correlated in proportion to the share of its area, which hit the landfill.

By Mary Kuzmenko

CEO Petiole
Growing plants and ideas

1 reply on “A Secret Formula to Calculate NDVI Pixel Values”

Greetings

I came across your blog just awhile ago and it addresses exactly my academic concerns
I am a beginner in Remote sensing and Mapping vegetation changes. Although I have a well grounded knowledge in climate science , I am unfortunately new to optic science and its use in monitoring plant behaviours.
I would be very grateful if you can give me useful tips, professional leads and where possible if you have links to videos that I can watch and get acquainted with.
I have basic knowledge on how to compute floating or integer based NDVI value of an AOI on daily, weekly, monthly or yearly scenes BUT do not understand what is meant by pixel-level NDVI value. Please could you briefly explain what this means and how it can be calculated. Secondly of what research value is it in comparison to calculating the monthly or weekly or yearly NDVI of a scene representing the AOI?
What are moving averages of NDVI?
I would be extremely thankful and grateful if you can lead me on this path as I have to submit a Term paper on this and time is really running against me.
With kind regards

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