I wonder if I could ask if it is possible to use Radiance to assess the albedo of an urban setting, e.g. a street gorge, where Radiance can take into account the near infra-red component of the solar spectrum as well as the visible one, please? Perhaps the visible component would have to be assessed first, and then the IR on a second run, after modifying the surface reflectances? Could Radiance be used like that?
Richard Watkins
Kent School of Architecture
University of Kent
Kent, UK
Richard,
I would say you can. I often use Radiance for assessing the solar
properties of shading systems.
However, you will have to consider that (I am speaking in VERY general,
some of these might not apply):
- Radiance uses only geometric optics. I have no idea what happens to
diffraction when wavelengths get longer... but that effect will not be
considered.
- Some materials will be opaque in some wavelengths and transparent in
others (i.e. glass), so the material properties might change a lot.
- If you get to very long wavelengths, some hot surfaces might even
become emitters. I guess that in order to get to this you will need VERY
hot surfaces; so for albedo it might not apply.
- At least in my cases, I assume the materials to be gray (i.e. have the
same optical properties for the whole range). This might not apply for VERY
long spectrums. To solve this, you might want to split into some more bands
than only IR and Visible. As a start, you can use the basic three channels
for three different bands.
- Will you need to change the sky and sun's definition, wouldn't you?
I hope it helps!
2014-10-22 10:18 GMT-03:00 Richard Watkins <[email protected]>:
I wonder if I could ask if it is possible to use Radiance to assess the
albedo of an urban setting, e.g. a street gorge, where Radiance can take
into account the near infra-red component of the solar spectrum as well as
the visible one, please? Perhaps the visible component would have to be
assessed first, and then the IR on a second run, after modifying the
surface reflectances? Could Radiance be used like that?Richard Watkins
Kent School of Architecture
University of Kent
Kent, UK
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