Estimation of diffuse and direct radiation starting from the global radiation

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SUMMARY

The discussion focuses on estimating the direct and diffuse components of global radiation on a south-oriented surface in a German locality. Francesco Are highlights the limitations of existing models, particularly the work by Spitters et al. (1986), which requires horizontal surface data. Participants emphasize that a single measurement of total hemispherical incidence is insufficient for unique separation of the components. They suggest exploring various models and resources related to Bidirectional Reflectance Distribution Functions (BRDFs) for further insights.

PREREQUISITES
  • Understanding of global radiation measurement techniques
  • Familiarity with Bidirectional Reflectance Distribution Functions (BRDFs)
  • Knowledge of canopy photosynthesis modeling
  • Basic principles of heat transfer and remote sensing
NEXT STEPS
  • Research methods for estimating direct and diffuse radiation components
  • Explore BRDF modeling techniques and their applications
  • Investigate the use of remote sensing data for radiation analysis
  • Review the implications of radiation components on canopy photosynthesis
USEFUL FOR

Researchers, meteorologists, and environmental scientists interested in radiation modeling, particularly those focused on agricultural applications and remote sensing techniques.

FrancescoP
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I don’t know if this one is the appropriate forum for the following question. If for this question it is better another section of the forum, point out to me, please.
I know the global radiation on a south oriented surface, in a German locality. Do you know methods to estimate the direct component and the diffuse component? I found an article very interesting

C.J.T. Spitters, H.A.J.M. Toussaint e J. Goudriaan, “Separating the diffuse and direct component of global radiation and its implications for modeling canopy photosynthesis Part I. Components of incoming radiation”, Agricultural and Forest Meteorology, Amsterdam, Elsevier Science Ltd., Volume 38, Issues 1-3, ottobre 1986, pp. 217-229

but unfortunately it isn’t useful in my case because as input data it presents the radiation on a horizontal surface, not on a south oriented surface.

With Regards
Francesco
 
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Are referring to the direct component from the sun, and the diffuse component from everywhere else?

I was only able to pull up the abstract, but based on that, it agrees with my suspicion- given a single measurement of the total (hemispherical) incidance, you cannot uniquely separate the direct and diffuse component. Those guys have a model; there are many models. Mostly people try and model BRDFs, but the concept is closely related to your problem.

http://www.pa.op.dlr.de/ISIS/
http://www.ecd.bnl.gov/pubs/BNL67010.pdf
http://modis.gsfc.nasa.gov/about/design.php
http://www-modis.bu.edu/brdf/userguide/intro.html

Other applications are heat transfer and remote sensing, you may find some good information that way.
 
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