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

Tue Apr 15 07:11:49 PDT 2014

I am using MS sky-scanner, it takes about 4.5 minutes to sky once the whole
sky dome. therefore, we are recording data in 15 min intervals.

Cheers,
Ehsan

On Tue, Apr 15, 2014 at 4:00 PM, chang cw <solomoncw76 at gmail.com> wrote:

> Yes or you can make measurements at 1 min interval.
>
> If you are willing to try new stuff check out sun photometers at
> http://aeronet.gsfc.nasa.gov
>
> though the do not cover the whole sky dome, i think with measurements that
> they make,  you can easily construct the scattering properties of the
> atmosphere from the phase function and that cover quite a few discrete
> wavelengths.
>
> Cheers
>
> CW
>
>
>
> On Tue, Apr 15, 2014 at 9:53 PM, Ehsan M.Vazifeh <em.vazifeh at gmail.com>wrote:
>
>> 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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>
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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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