PMC

HSI depth parameter along the inclusion for different positions perpendicular to the inclusion and the lower and upper depth of the inclusion. The left y-axis shows the depth parameter and the right y-axis the results from the real depth. In all cases, the depth parameter acts linear (marked by red ellipses) with the actual depth up to a maximal depth depending on the optical properties. The green and orange graphs represent the real depth, measured by an OCT and a caliper.

Correlation and agreement graphs: (A) Correlation of the height calculation with the X-ray depth: r = 0.89, p < 0.05; (B) Bland-Altman graph for the height calculation and the X-ray depth; (C) Correlation of the weight calculation with the X-ray depth: r = 0.75, p < 0.05; (D) Bland-Altman graph of the weight calculation and the X-ray depth; (E) Correlation of the endotracheal tube diameter calculation with the X-ray depth: r = 0.80, p < 0.05; (F) Bland-Altman graph for the endotracheal tube calculation and the X-ray depth.

(a) Snow depth measured by UAV (H_UAV) compared to the reference snow depth measured at GCP positions (H_GCP) at all study sites. (b) Snow depth measured by UAV (H_UAV) compared to the reference snow depth measured in a denser network (H_T) at all study sites. The dataset in (b) features a significantly higher snow depth variability (R² = 0.20) than dataset formed by snow depth measurements taken at GCP positions (R² = 0.60). Graphs show the regression functions (dashed lines) and 1:1 correspondence (solid lines).

HSI depth parameter perpendicular to the inclusion for different positions along the inclusion and the lower and upper depth of the inclusion. The left y-axis shows the depth parameter and the right y-axis the results from the real depth. The green and orange graphs represent the real depth, measured by an OCT and a caliper.