[Radiance-general] Re: Cumulative calculations of irradiance

[Greg Ward]

Hi Chris,

I haven't done this, but you should be able to compute the maximum  
values between two images using pcomb like so:

	pcomb -h -e 'max(a,b):if(a-b,a,b)' -e 'lo=max(li(1),li(2))' -o  
last_max.pic -o new_vals.pic > cur_max.pic

Renaming cur_max.pic to last_max.pic (using mv -f cur_max.pic  
last_max.pic) before each invocation should maintain the maximum  
values at each pixel over each new addition of new_vals.pic.  (The -h  
option is to avoid endless growth of the picture header.)

I hope this helps.
-Greg

> From: Christian Humann <chumann at broadviewnet.net>
> Date: June 8, 2008 11:08:44 AM PDT
>
> I've been trying to work out a similar solution for generating a  
> composite image of hourly irradiance values over a full year.    
> However, rather than cumulative results, as produced with pcomb, I  
> want each pixel in the final image to only represent the highest  
> value of irradiance that occurs at that pixel location over a years  
> worth of hourly runs.  Ex: if a given pixel gets the highest level  
> of irradiance on June 21 @ noon then that will be the value given  
> to that pixel in the final image.  Has anyone tackled this before?  
> Thanks.
>
> Regards to all,
> Chris H
> Berkeley,CA