UAV and Machine Learning Based Refinement of a Satellite-Driven Vegetation Index for Precision Agriculture Vittorio Mazzia, Lorenzo Comba, Aleem Khaliq, Marcello Chiaberge, Paolo Gay (2020) UAV and Machine Learning Based Refinement of a Satellite-Driven Vegetation Index for Precision Agriculture, In: SENSORS, pp. 2530, ISSN: 1424-8220