This option can be used in order to calculate an effective solar zenith angle for a time interval, instead of a distinct point in time. The cosine of the solar zenith angle is here replaced by its time average. The azimuth of the sun is replaced by an average of the azimuth position weighted with the cosine of the solar zenith angle.
time_interval dtime_start dtime_end [unit]
time_interval    -180        180     min
the time interval reaches from time + dtime_start to time + dtime_end, in the example from 180 minutes before time to 180 minutes after time. The unit argument is optional, and can be one of the following: s (seconds), min (minutes), or h (hour). The default is s. This option makes only an effect in combination with time, latitude, longitude, and only has an effect for solar simulations (and of course if no sza defined).





Arve Kylling 2010-03-10