Illumination Geometry and Flying Height Influence Surface Reflectance and NDVI Derived from Multispectral UAS Imagery

• Published in: Drones (Basel) Vol. 3; no. 3; p. 55
• Main Authors: Stow, Daniel, Nichol, Caroline, Wade, Tom, Assmann, Jakob, Simpson, Gillian, Helfter, Carole
• Format: Journal Article
• Language: English
• Published: MDPI AG 01.09.2019
• Subjects: anisotropic reflectance; data quality; illumination geometry; multispectral imagery; NDVI; Parrot Sequoia; radiometric calibration; remote sensing; UAV

Small unmanned aerial systems (UAS) have allowed the mapping of vegetation at very high spatial resolution, but a lack of standardisation has led to uncertainties regarding data quality. For reflectance measurements and vegetation indices (Vis) to be comparable between sites and over time, careful f...