[Radiance-general] Modelling sky using sky scanner MS-321LR

[Ehsan M.Vazifeh]

Dear All,

I am calculating now the RGB Luminance for each patch of Tregenza. If lets
say I have a radiance of 200 W/(sr.m^2) then the luminance for red will be
200*0.265*179, green will be 200*0.67*179, and blue will be 200*0.065*179
?!!
or I should simply say R=G=B=200/3*179??

Thanks a lot.
Ehsan

On Mon, Apr 14, 2014 at 4:37 PM, Ehsan M.Vazifeh <em.vazifeh at gmail.com>wrote:

> Thank you very much! I will try to use both methods.
>
> Cheers,
> Ehsan
>
>
> On Mon, Apr 14, 2014 at 3:13 PM, John Mardaljevic <
> J.Mardaljevic at lboro.ac.uk> wrote:
>
>> Hi Ehsan,
>>
>> Yes, that's right -- you simply scale the measured (circular patch)
>> luminance or radiance values by the ratio of the 'rectangular' patch solid
>> angle to the circular source solid angle, i.e. some factor > 1.  Your sky
>> will of course not be continuous, but at least the total luminous output
>> will be realistic.  See table 3-7, p70 in Chapter 3 here:
>>
>> http://climate-based-daylighting.com/doku.php?id=resources:thesis
>>
>> Another way is to use the measured data to create a 'brightdata'
>> representation of the sky, which will be continuous.  How that is done is
>> also described in Chapter 3.
>>
>> Cheers
>> John
>>
>> John Mardaljevic PhD FSLL
>> Professor of Building Daylight Modelling
>> School of Civil & Building Engineering
>> Loughborough University
>> Loughborough
>> Leicestershire
>> LE11 3TU, UK
>>
>> Tel: +44 1509 222630 (Direct)
>> Tel: +44 1509 228529 (Pam Allen, secretary)
>>
>> j.mardaljevic at lboro.ac.uk
>>
>> http://www.lboro.ac.uk/departments/civil-building/staff/mardaljevicjohn
>>
>> Personal daylighting website:
>> http://climate-based-daylighting.com
>>
>>
>> _______________________________________________
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>>
>
>
>
>
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