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Excepto si se señala otra cosa, la licencia del ítem se describe como: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2 0 1 8 T h e A u t h o r s . T r a n s a c t i o n s i n G I S p u b l i s h e d b y J o h n W i l e y & S o n s L t d