Figure 8 | A checkerboard-based technical validation of the original reflectance values prior to L1-normalization shows a relevant difference to other spectrometer measurements. Spectrometer (purple) and HSI (light and dark green) recordings for the 24 different color chips. The median spectrum across all available recordings (100 recordings for spectrometer, 13 recordings for HSI) is denoted by a solid line, the corresponding standard deviation as a shaded area.