Comparison of Cloud Cover Detection Algorithms on Sentinel–2 Images of the Amazon Tropical Forest

Tropical forests regulate the global water and carbon cycles and also host most of the world’s biodiversity. Despite their importance, they are hard to survey due to their location, extent, and particularly, their cloud coverage. Clouds hinder the spatial and radiometric correction of satellite imag...

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Vydané v:Remote sensing (Basel, Switzerland) Ročník 12; číslo 8; s. 1284
Hlavní autori: Sanchez, Alber Hamersson, Picoli, Michelle Cristina A., Camara, Gilberto, Andrade, Pedro R., Chaves, Michel Eustaquio D., Lechler, Sarah, Soares, Anderson R., Marujo, Rennan F. B., Simões, Rolf Ezequiel O., Ferreira, Karine R., Queiroz, Gilberto R.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: MDPI AG 01.04.2020
Predmet:
algorithms
amazon forest
Amazonia
biodiversity
carbon
cloud cover
clouds
Fmask
radiometry
remote sensing
Sen2Cor
Sentinel–2
surveys
tropical forests
Amazonia
ISSN:2072-4292, 2072-4292
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Shrnutí:Tropical forests regulate the global water and carbon cycles and also host most of the world’s biodiversity. Despite their importance, they are hard to survey due to their location, extent, and particularly, their cloud coverage. Clouds hinder the spatial and radiometric correction of satellite imagery and also diminishing the useful area on each image, making it difficult to monitor land change. For this reason, our purpose is to identify the cloud detection algorithm best suited for the Amazon rainforest on Sentinel–2 images. To achieve this, we tested four cloud detection algorithms on Sentinel–2 images spread in five areas of the Amazonia. Using more than eight thousand validation points, we compared four cloud detection methods: Fmask 4, MAJA, Sen2Cor, and s2cloudless. Our results point out that FMask 4 has the best overall accuracy on images of the Amazon region (90%), followed by Sen2Cor’s (79%), MAJA (69%), and S2cloudless (52%). We note the choice of method depends on the intended use. Since MAJA reduces the number of false positives by design, users that aim to improve the producer’s accuracy should consider its use.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:2072-4292
2072-4292
DOI:10.3390/rs12081284