A Deep-Learning Approach to a Volumetric Radio Environment Map Construction for UAV-Assisted Networks

Table 4

Comparing the image quality of the contracted VREM at different altitudes.

Mean SSIM	1.5 m	3 m	9 m	12 m	15 m
Vol2Vol-VREM	0.748	0.802	0.842	0.927	0.9447
Sliced-VREM	0.799	0.833	0.868	0.905	0.922