Table 1. Image acquisition.

DOY	Year	Flight altitude (m)	GCPs	Images acquired	Images used	GSD (cm)	Images overlap
130	2015	70	6*	88	88	2.14	5+
188	2015	70	67	150	150	2.20	5+
63	2016	50	14	59	59	1.44	5+

Flight altitude, number of ground control points (GCPs), number of RGB images acquired and used for the DSM generation, ground sample distance (GSD) and image overlap at each date of flight. Images overlap indicates the number of overlapping images computed for each pixel of the orthomosaic.

* Manual Tie Points (More details are reported in the Material and Methods section).