Image data was acquired in August 2019 using a WingtraOne (Wingtra AG, Zurich) platform. This hybrid tail-sitter drone enables image data collection of areas up to 400 ha in a single flight. To generate a broad range of aerial data, both a full-frame Sony RX1RII 42-megapixel RGB and a Micasense RedEdge-MX camera with five narrow bands were used. Accordingly, the survey area (Fig. (Fig.1b)1b) was mapped in two single flights: one for RGB and one for multispectral imagery. The forward and sideward image overlap was set to 80% for RGB and 70% for multispectral imagery, respectively. Both flights were carried out at a pre-set altitude of 100 m above ground level, resulting in a ground sample distance (GSD) of approximately 1.4 cm for RGB and 6.8 cm for multispectral imagery (Fig. (Fig.1c).1c). For multispectral data post-calibration, a calibrated white reference panel was recorded shortly before and after flight. In addition, an on-board installed downwelling light sensor (DLS) was used to enable improved reflectance calibrations in situations where light conditions are changing in mid-flight, for example, due to temporary clouds. Weather conditions were slightly windy with scattered cloud cover. Both flights were carried out around solar noon to avoid strong cast shadow effects.

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