[Radiance-general] Re: Cumulative calculations of irradiance

[Christian Humann]

Hi Greg,

Thanks for the quick response.  I've been trying the pcomb line as you  
have suggested but the resultant image still seems to show the  
cumulative values?  I seem to get the same results just using:
     pcomb *.raw > annual.pic

Thanks again.

Chris
On Jun 8, 2008, at 11:55 AM, Greg Ward wrote:

> 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
>
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