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(1) Universidade de Lisboa, IDL, Lisboa, Portugal (ilfmiranda@hotmail.com, acferreira@fc.ul.pt, jcfernandes@fc.ul.pt) (2) LEAF, ISA, School of Agriculture of the University of Lisbon, Lisbon, Portugal (joaorolim@isa.utl.pt)
(3) NOVA IMS, Information Management School of the New University of Lisbon, Lisbon, Portugal (jsilva@novaims.unl.pt, painho@novaims.unl.pt)
(4) ITC, Faculty of Geo-information Science and Earth Observation of the University of Twente, Enschede, The Netherlands (z.vekerdy@utwente.nl)
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