Comparison of values measured by sensors and calculated with Radiance (Greg Ward)

Dear Greg,

I am so sorry not to have explained the model enough. I'll check my sensors
at first and drop a line here if I could find what is problem. Thank you
again for your kind reply.

Best Regards,


Message: 5


Date: Thu, 2 Apr 2009 08:59:18 -0700
From: Greg Ward <[email protected]>
Subject: Re: [Radiance-general] Re: Comparison of values measured by
       sensors and calculated with Radiance (Greg Ward)
To: Radiance general discussion <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
Dear Sung,
It seems I misread your diagram the first time, so misinterpreted
your problem. I'm thinking now that the issue may be the cosine
correction of your sensors rather than what is going on in Radiance.
Most lux sensors have a crude calibration with respect to incident
angle. I recommend checking your sensors against one that is more
reliable, or at least verifying that they have the proper cosine
response by measuring a point source at varying incident angles.