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Solar Forecasts Based on the Clear Sky Index or the Clearness Index: Which Is Better?
Solar, 2022 In the realm of solar forecasting, it is common to use a clear sky model output to deseasonalise the solar irradiance time series needed to build the forecasting models.
Philippe Lauret +3 more
doaj +3 more sources
Detecting clear sky images [PDF]
Solar Energy, 2019 Abstract Many solar forecast algorithms based on ground based sky imagery apply the red-blue ratio (RBR) method to classify image pixels as clear or cloudy, by comparing the current image with the corresponding image from a clear sky library (CSL). The CSL needs to be updated regularly due to changes in clear sky readings over time caused by aerosols
Jan Kleissl
exaly +4 more sources
KPV: A clear-sky index for photovoltaics
Solar Energy, 2014 Abstract The rapidly growing installed base of distributed solar photovoltaic (PV) systems is causing increased interest in forecasting their power output. A key step towards this is accurately estimating the output from a PV system based on the known output from a nearby PV system.
Engerer, Nicholas, Mills, Franklin
exaly +3 more sources
Detection of clear sky instants from high frequencies pyranometric measurements of global horizontal irradiance [PDF]
E3S Web of Conferences, 2021 Solar resource assessment by clear sky models is of great importance in the solar energy field: verifying the performance of photovoltaic systems during stable conditions, clouds effects evaluation, the determination of geographical areas where ...
El Alani Omaima +3 more
doaj +3 more sources
Applied Sciences, 2022 This study calibrated and compared the capabilities of hourly global horizontal irradiance (GHI) clear sky models for six Moroccan locations, using the McClear clear sky model as a reference.
Abderrahmane Mendyl +3 more
doaj +1 more source
All-sky assimilation of infrared radiances sensitive to mid- and upper-tropospheric moisture and cloud [PDF]
Atmospheric Measurement Techniques, 2019 All-sky assimilation of infrared (IR) radiances has not yet become operational at any weather forecasting centre, but it promises to bring new observations in sensitive areas and avoid the need for cloud detection.
A. J. Geer, S. Migliorini, M. Matricardi
doaj +1 more source
A total sky cloud detection method using real clear sky background [PDF]
Atmospheric Measurement Techniques, 2016 The brightness distribution of sky background is usually non-uniform, which creates many problems for traditional cloud detection methods, including the failure of thin cloud detection in total sky images and significantly reducing retrieval accuracy in ...
J. Yang +7 more
doaj +1 more source
Study of clear sky models for Singapore [PDF]
2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), 2017 Published in Proc.
Soumyabrata Dev +3 more
openaire +2 more sources
Earth and Space Science, 2022 Time series of clear‐sky irradiance are fundamental for the understanding of changes in the Earth Radiation budget, since they allow to examine radiative processes in the cloud‐free atmosphere.
Lucas Ferreira Correa +3 more
doaj +1 more source
Remote Sensing, 2023 Leaf area index (LAI) and canopy chlorophyll content (CCC) are important indicators that describe the growth status and nitrogen deficiencies of crops.
Wenjuan Li +6 more
doaj +1 more source