[Radiance-general] Direct horizontal illuminance

[TSANG Kai Kwong]

Dear Dr. Greenup,

I am a bit confused by the steps.


In step 3, the horizontal global illuminance is needed to calculate the ground reflectivity. So, should I go to the step 11 to get the HGI? However, if I want to complete the step 11, a completed sky.rad is required, so I have to assume some numbers (solar brightness, ground brightness and arbitrary zenith radiance) in the sky.rad?

How should I assume those numbers? Thank you.

Best regards,
Dennis Tsang
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