Fig. 3From: Dynamic monitoring of biomass of rice under different nitrogen treatments using a lightweight UAV with dual image-frame snapshot camerasThe contour map of the absolute r-value between aboveground biomass (AGB) and NDSI (i, j), and it is calculated using reflectance values Rλ1 and Rλ2 at thorough combinations of two wavebands, i and j nmBack to article page