Influence of AGL flight and off-nadir images on UAV-SfM accuracy in complex morphology terrains
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Agüera Vega, Francisco; Carvajal Ramírez, Fernando; Martínez Carricondo, Patricio Jesús; Ferrer González, Ezequiel; Mancini, Francesco; [et al.]Fecha
2022Resumen
In the field of geosciences and engineering, situations arise where
special attention have to be paid to the planning of the UAVphotogrammetric
project, that is, terrain with complex geometry
and steep slopes. The use of off-nadir imagery and flights at a
fixed height above ground level (AGL) are postulated as possible
factors to be considered to achieve high accuracies. The objective
of this study is to evaluate the influence of image angle, frontal
and side overlaps, and type of flight (above mean sea level
(AMSL) or AGL), on the accuracy of the dense 3D point cloud
yielded by UAV-SfM. The results obtained showed that imagery
with an angle between 20 and 35 in two perpendicular flight
line directions, 90/90, 90/70 or 70/70 overlap and AGL flight is
the optimal combination for best accuracy and high precision.
With nadir imagery, the combination of factors that gives the
most accuracy results are AGL flights with a 90/70 overlap.
Palabra/s clave
unmanned aerial vehicle
oblique images
above ground level
above mean sea level
UAV-SfM photogrammetry
complex terrain morphology