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

Tue Apr 15 06:53:14 PDT 2014

Hi Chang,

As I understand you correctly, you mean to filter each color, therefore, I
need three sky scanner? :s

Cheers,
Ehsan

On Tue, Apr 15, 2014 at 3:25 PM, chang cw <solomoncw76 at gmail.com> wrote:

> hi guys, been out of touch of this topic for a long time :0).
>
> You cannot use the L from the sky scanner to get those RGB. But you can
> actually put filter with known bandpass over the sky scanners to make
> isolated measurements at different radiances
>
> CW
>
>
> On Tue, Apr 15, 2014 at 9:20 PM, CHI-German Molina <gmolina at hdlao.com>wrote:
>
>> Ehsan,
>>
>> I understand you can't find the R,G and B values from the total luminance
>> values (i.e. finding R, G and B from the equation
>> "L=179*(0.265*R+0.67*G+0.065*B)" is not mathematically possible).
>>
>> You can use a "gray" sky by assigning R=G=B=L/179, which solve your
>> equation.
>>
>> There might be a way of using a Colored sky, but I do not know it.
>>
>>  Bye!
>>
>> Germán
>>
>>
>>
>>
>> 2014-04-15 10:10 GMT-03:00 Ehsan M.Vazifeh <em.vazifeh at gmail.com>:
>>
>> 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
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Radiance-general mailing list
>>>>> Radiance-general at radiance-online.org
>>>>> http://www.radiance-online.org/mailman/listinfo/radiance-general
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>
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>>
>>
>> --
>> *Germán Molina L.*
>> Ingeniero Trainee
>> Hunter Douglas Chile S.A.
>> Celular +569 89224445
>>
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-- 
Dipl. Ing. Ehsan, M. Vazifeh
Project Assistant
Department of Building Physics and Building Ecology
Vienna University of Technology
Karlsplatz 13, A-1040 Vienna, Austria
Tel +43 1 58801 27003
Fax +43 1 58801 27093
Ehsan.mahmoudzadehvazifeh at tuwien.ac.at
www.bpi.tuwien.ac.at
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