Software for automated reading of sunshine duration by Digital Image Processing
Keywords:
Digital Image Processing, sunshine hours counting, solar radiationAbstract
The present study aims to demonstrate the benefits and results obtained from software for filtering, processing and managing sunshine duration monitored by heliographs, in meteorological stations. The source code of the software was developed using the Java EE 7 (Java Enterprise Edition) programming language, based on internet applications. Information storage and management was performed by the MySQL 5.7 Database Management System (DBMS). Digital image processing techniques, incorporated in the software, allowed to count sunshine duration in an automated and standardized way, eliminating errors due to the complexity and subjectivity in the measurement observation, performed manually. Processing routines were implemented to apply filters in the spatial domain, enhancing digital images of sunshine data, to better identify parts of interest and ensure quality in the accounting process. For software validation, a set of September 2015 sunshine data, provided by the Lageado Meteorological Station of the School of Agricultural Sciences (UNESP) of Botucatu - SP, was used. In which, comparisons between readings performed by the computer program and readings performed manually showed MBE values of 0.130 hours (rMBE = 1.908%), RMSE of 0.259 hours (rRMSE = 3.791%) and R of 0.998. Indicating that the software can be used to read sunshine data, as it ensures automation, standardization and speed in the process.
Downloads
References
V. P. Borges et al., “Avaliação de modelos de estimativa da radiação solar incidente em Cruz das Almas, Bahia,” Revista Brasileira de Engenharia Agrícola e Ambiental, vol. 14, no. 1, pp. 74-80, 2010.
C. A. S. Querino et al., “Estudo da radiação solar global e do índice de transmissividade (KT), externo e interno, em uma floresta de mangue em Alagoas - Brasil,” Revista Brasileira de Meteorologia, vol. 26, no. 2, pp. 204-214, 2011.
A. P. Souza et al., “Estimativa das componentes da radiação solar incidente em superfícies inclinadas baseadas na radiação solar global horizontal,” Revista Brasileira de Engenharia Agrícola e Ambiental, vol. 15, no. 3, pp. 277-288, 2011.
H. Liu et al., “Global solar radiation estimation with sunshine duration in Tibet, China,” Renewable Energy, vol. 36, no. 11, pp. 3141-3145, 2011.
M. A. Varejão-Silva, Meteorologia e Climatologia: Versão Digital 2. Recife: Esalq, 2006, pp. 449.
N. Zhao, X. Zeng and S. Han, “Solar radiation estimation using sunshine hour and air pollution index in China,” Energy Conversion and Management, vol. 76, pp. 846-851, 2013.
A. Das, J. Park and J. Park, “Estimation of available global solar radiation using sunshine duration over South Korea,” Journal of Atmospheric and Solar-Terrestrial Physics, vol. 134, pp. 22-29, 2015.
M. El-Metwally, “Simple new methods to estimate global solar radiation based on meteorological data in Egypt,” Atmospheric Research, vol. 69, no. 3-4, pp. 217-239, 2004.
M. Iqbal, An Introduction to Solar Radiation. Ontario: Academic Press, 1983, pp. 393.
M. Paulescu et al., “Ångström-Prescott equation: Physical basis, empirical models and sensitivity analysis,” Renewable and Sustainable Energy Reviews, vol. 62, pp. 495-506, 2016.
APACHE NETBEANS, “Development Environment, Tooling Platform and Application Framework,” 2019. [Online]. Available: https://netbeans.apache.org/. Accessed on: Oct 23, 2019.
ORACLE, “Java™ EE at a Glance,” 2019. [Online]. Available: https://www.oracle.com/java/technologies/java-ee-glance.html. Accessed on: Oct 23, 2019.
MYSQL, “Why MySQL,” 2019. [Online]. Available: https://www.mysql.com/why-mysql/. Accessed on: Oct 23, 2019.
BOOTSTRAP, “About,” 2019. [Online]. Available: https://getbootstrap.com/docs/4.3/about/overview/. Accessed on: Oct 23, 2019.
H. Pedrini, and W. R. Schwartz, Análise de Imagens Digitais: Princípios, Algoritmos e Aplicações. São Paulo, SP, Brasil: Thomson Learning, 2008, pp. 508.
R. C. Gonzalez, R. E. Woods, Processamento Digital de Imagens. São Paulo, SP, Brasil: Person Education, 2010, pp. 624.
C. A. Lujan, F. J. Mora and J. R. Atoche, "Comparative analysis in the implementation of subtraction and thresholding for digital image processing," in 2008 5th International Conference on Electrical Engineering, Computing Science and Automatic Control, Mexico City, 2008, pp. 465-469.
C. Voyant et al., “Machine learning methods for solar radiation forecasting: A review,” Renewable Energy, vol. 105, pp. 569-582, 2017.
![](https://latamt.ieeer9.org/public/journals/1/submission_2900_2617_coverImage_en_US.png)