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Physically-based radiative transfer models (RTMs) help in understanding the processes occurring on the Earth's surface and their interactions with vegetation and atmosphere. However, advanced RTMs can take a long computational time, which makes them unfeasible in many real applications. To overcome this problem, it has been proposed to substitute RTMs through so-called emulators. Emulators are statistical models that approximate the functioning of RTMs. They are advantageous in real practicedoi:10.1109/igarss.2015.7325843 dblp:conf/igarss/VerrelstRGCM15 fatcat:ppq5ua76cncmjgy67sufwmyzqe