[Radiance-general] Site Standard Meridian argument in genrsky

[Vaib]

Thank you! Your Radiance tutorial and Cookbook are also very helpful.

Best regards,
Vaibhav

On 5 January 2014 17:18, Axel Jacobs <jacobs.axel at gmail.com> wrote:

> Hi Vaib,
>
>  I just wish to confirm about the Site Standard Meridian (-m) argument
>> for genrsky. Is it the following:
>>
>> Local longitude of Standard Time Meridian (LSTM):
>> LSTM = 15 deg x (Longitude/15 deg)_round to integer
>>
>
> What you are describing is a special case that is true for most, but not
> all, time zones.
>
> Most time zones in Radiance notation are given in multiples of 15 degrees.
>  Exceptions to this are the countries marked on this map
> http://www.icsm.gov.au/mapping/images/time_zones.jpg
> with a star.
>
> Countries that have a TZ of GMT +/- X.5 hrs or -(X*15) + 7.5 deg include:
> - India
> - a bit of Australia
> - Iran
> (there are more...)
>
> Finally, there is Nepal which is at GMT +5:45 hrs or -5.75*15 = -86.25 deg
> in Radiance notation.
>
> In other words: the 'round to integer' part of your equation is correct in
> most, but not all, cases.  You might end up with a floating point number if
> your project is located in exotic places.
>
> FYI: This integer bug existed in epw2wea which just recently made it into
> Radiance HEAD. It was fixed just before Christmas.
>
> Regards
>
> Axel
>
>
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