Hello Lisanne,

If you only need leaf cover and not leaf area index (LAI), you can use zenithal photographs. In this case, you don't need a fish eye.

If you want to asses LAI, fish eye is not essential. You can target the sample with the magic angle of view of 57.5°. This angle is directly linked to LAI.

I suggest you the following link to have more information and to dowload a very simple software that allow easy automatic image thersholding and analysing for both fisheye and zenithal pictures : https://www6.paca.inra.fr/can-eye

Let me know if you have the information you needed.

Regards

Alain

Hi Alain,

Thanks for your answer! Could you explain a bit more about the angle? (I'm not familiar with these kinds of techniques) Do you mean taking a picture with a normal lens at the angle of 57 degrees from the horizontal plane, or is the 57 degrees a specification of the lens you need to use?

Cheers,

Lisanne

I'm sorry I was a bit to fast. I mean 57.5° from zenithal angle.

You should ask for the following article from my colleagues :

https://www.researchgate.net/publication/229439347_PAI_estimates_from_digital_photos_at_575_zenith_angle_over_wheat_crops

Cheers

Alain

Article PAI estimates from digital photos at 57.5° zenith angle over...