Prof. Maria Nicolina Ripa Profile

Prof. Maria Nicolina Ripa

at University of Tuscia

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Proceedings Article | 28 October 2022 Presentation + Paper

Combining OBIA approach and machine learning algorithm to extract photovoltaic panels from Sentinel-2 images automatically

Claudio Ladisa, Alessandra Capolupo, Maria Nicolina Ripa, Eufemia Tarantino

Proceedings Volume 12262, 122620K (2022) https://doi.org/10.1117/12.2636451

KEYWORDS: Image segmentation, Photovoltaics, Solar energy, Satellites, Machine learning, Short wave infrared radiation, Satellite imaging

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The Energy Union Framework Strategy is pushing the entire world to move from fossil fuels to renewable energy to tackle climate changes and mitigate their effects. Among the clean energy alternatives, the sun is recognized as the most abundant and inexhaustible source and the energy production can be carried out through photovoltaic panels. Nevertheless, such a solar park requires the use of large land areas, stolen, in such a way, from food production, which demand has strongly increased in the last few years due to the growing world population. Thus, agrophotovoltaic systems, also known as agrivoltaic structures, are under way to meet the above-mentioned needs synergistically. This has led to the necessity of monitoring solar panels amount and allocation. Their detection is challenging since, albeit their spectral signature is totally different from that one emitted from other land covers, their occurrence received little attention in the field of remote sensing. Thus, in this study, a proper rule-based model for distinguishing photovoltaic panels developed on eCognition environment was proposed. Such a model is based on the combination of Object-Based Image Analysis and machine learning algorithm. Indeed, after optimizing segmentation parameters and analyzing morphological features of the panels, the Random Forest classification algorithm was implemented. Lastly, classification accuracy was evaluated. The experimentation was conducted on the study area of Viterbo (Lazio Region, Italy) by adopting open medium-resolution satellite data (Sentinel 2). This research showed promising results in classifying targets for almost all months of the time series, except for the months of October and November where there is a lowering of the accuracy value due to the variability of spectral signatures.

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