Fig. 2
From: Effectiveness of the spectral area index created by three algorithms for tree species recognition
Polygons with different area sizes formed by spectral curves of different tree species/bamboo. A Average reflectance spectral curves of the various tree species/bamboo in WorldView-3. Differences are found in the polygonal area sizes of various tree species/bamboo, and these polygons are formed by the spectral curves and the horizontal and vertical axes. B Creation process of polygon area index and relative area constraint described by the graphic illustration. The tree species T7 and T10 were taken with the largest difference in the polygon area in A as an illustration example