The eBee family is marketed in conjunction with customised sensors which can be controlled by the autopilot of the fixed-wing UAV. The Canon S110 RGB is a low-cost colour camera, the Canon S110 NIR and S110 RE are low-cost multispectral cameras while the multiSPEC 4C is a high-end system. The Canon multispectral cameras are equipped with modified Bayer colour filters – instead of recording blue, green and red, the green (G), red (R) and near infrared (NIR) bands are captured. Just one lens is needed resulting in precisely co-registered spectral channels with overlapping spectral sensitivities (Figure 1). In contrast, the multiSPEC 4C has four lenses and four monochromatic CCD sensors the colour separation takes place at the optical units via band-pass interference filters with well-defined central frequencies and bandwidths (Figure 2). Table 1 provides details of the above-mentioned sensors.Ī zenith-looking panchromatic sensor enables the images to be normalised. Table 1, Main features of the sensors in the tests. Test fields of the Agricultural Centre Liebegg (AG, Switzerland) with different crops were captured by the Canon S110 NIR and multiSPEC 4C. A second study captured several fields, including: A rape field was flown aimed at determining optimal harvesting time and crop yield estimates related to species and treatment.a wheat field with different fertilising strategies.a beetroot field with potential fungal infestation. ![]() a potato field aimed at determining the optimal time for crop desiccation and monitoring of potato blight, a devastating disease which caused the Irish potato famine of the mid-19 th century.In each field, three to seven ground control points (GCPs) were established with a horizontal and vertical point accuracy of 2cm.Ī total of 24 flights were carried out, each lasting 20-40 minutes and capturing 40 to 900 images, each with a ground sampling distance (GSD) of between 2.5cm and 10cm.
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