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Table 3 Metrics computed from the DMS S.O.D.A-RGB-UAV-data at crown level

From: Assessing a novel modelling approach with high resolution UAV imagery for monitoring health status in priority riparian forests

Class Variable Formula
(“Terrain” package, Hijmans et al. 2015)
Reference
DSM
 Slope SLOPEsd Slope (Horn 1981)
 Topographic position index TPImean and TPIsd where \( TPI=y-\sum \limits_{i=1}^8\frac{y_i}{8} \), with y is the altitude of a cell and yi is the altitude of the i-th adjacent cell (Wilson et al. 2007)
 Terrain ruggedness index TRImean and TRIsd where \( TRI=\sum \limits_{i=1}^8\frac{\left|{y}_i-y\right|}{8} \), with y is the altitude of a cell and yi is the altitude of the i-th adjacent cell
 Roughness ROUGHNESSmean and ROUGHNESSsd Roughness is the difference between the maximum and the minimum value of a cell and its 8 surrounding cells
 Texture dsm_GLCM_mean
(window size of 3 × 3 pixels and a 45 degree shift)
“mean”, “variance”, “homogeneity”, “contrast”, “dissimilarity”, “entropy”,
“second_moment”, “correlation”