Thermal Camera Simulator - Shader

There is a thermal camera in the vehicle included in a large project I am are doing. I want to simulate a thermal camera. I dont want this to be simple, but to be very realistic. In this reality calculation, when looking at a field, it is desired to keep track of how much sun exposure objects, such as a tree, are exposed to and color them accordingly. It is necessary to paint it in shades of green as seen in the picture.

I did a lot of research but I couldn’t find the most suitable solution. Could you please help me?
termal2

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