Effective Accuracy of Satellite-Derived Hourly Irradiances |
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Authors: | A Zelenka R Perez R Seals D Renné |
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Institution: | (1) Swiss Meteorological Institute, Zurich, Switzerland, CH;(2) Atmospheric Sciences Research Center, State University of New York, Albany, NY, USA, US;(3) National Renewable Energy Laboratory, Golden, Colorado, USA, US |
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Abstract: | Summary Estimates of hourly global irradiance based on geostationary satellite data with a resolution of several (2 to 10) kilometres
reproduce ground-measured values with a Root Mean Square Error (RMSE) of typically 20% to 25%. The different components of
this RMSE have been enumerated by several authors but, due to the lack of adequate measurements, their respective importance
is not well settled. In the present study we attempt to quantify these components from a practical point of view, that is
from the point of view of users having to rely on time/site specific irradiance data. We conclude that the intrinsic, or “effective”
RMSE is more along the line of 12%. This effective RMSE is the measure of the methodological imprecision (satellite-to-irradiance
conversion models). The remaining part of the overall RMSE is the amount by which spatially averaged satellite-derived estimates
are, by their very nature, bound to differ from ground-measured local insolation.
Received August 15, 1997 Revised March 4, 1998 |
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