[Radiance-general] Asking for informations

[Terrance McMinn]

Follow up question:

Using gendaylit rather than the gensky sky generator we have additional 
-O options. -O 1 for W/m^2/sr solar radiation.

    /From the gendaylit man page:
    The output can be set to either the radiance of the visible
    radiation, the solar radiance (full spectrum) or the luminance.
    //*-O*//[0|1|2] (0=output in W/m^2/sr visible radiation (default),
    1=output in W/m^2/sr solar radiation, 2=output in lm/m^2/sr luminance)./

Looking at the source code it appears the -O 0 option divides 
illuminance by 179 whilst the -O 1 and -O 2 don't. I couldn't see how 
the units are outputted from gensky (in relation to the 179 multiplier) 
to allow me to compare it to the gendaylit options.

One might assume that the -O 0 option would be set to similar units as 
the gensky generator.

 From this confusion what multiplier should be used with the falsecolor 
program when using gendaylit options 0, 1 and 2 remembering that 
falsecolor has the default -m 179?

(I all cases I would be using the rpict -i option and looking for units 
in W/m^2)

Regards
*Terrance McMinn*

On 8/04/2016 10:27 am, Terrance McMinn wrote:
> Thank you Chris.
>
> From an irradiance image (-i) I didn't realise a multiplier of 1 in 
> falsecolor provided units in W/m^2
>
> I accept the reservations. For this project a gross mapping over a 
> large site with block building shapes, the results can only be 
> construed as indicative.
>
> Regards
> *Terrance McMinn*
>>
>> Yes, there is a -m multiplier option to falsecolor, which defaults to 
>>    -m 179    and should equate to lux or cd/m². Luminance in cd/m2 is 
>> the default label to display luminance unless you give the   -l lux 
>>     option for example for illuminance – both related to the 179 
>> lumen/Watt multiplier.
>>
>> However for Watts you can use    -m 1    in your options to 
>> falsecolor along with    -l W/m2    to change the label to display as 
>> W/m2. That is presuming your image is calculated with -i option for 
>> irradiance. I don’t think people would normally expect to see a Watts 
>> based radiance image in W/sr/m2.
>>
>> This is also presuming the intent of your image takes into account 
>> all the shortcomings that Achim noted.
>>
>> *From:*Terrance McMinn [mailto:t.mcminn at ocpms.com.au]
>> *Sent:* Thursday, April 07, 2016 9:39 AM
>>
>> Can you configure falsecolor to map as w/sqm?
>>
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