Fine-Grained Point Cloud Semantic Segmentation of Complex Railway Bridge Scenes from UAVs Using Improved DGCNN

Table 1

Parameters of the three railway scenes.

Items	Scene (a)	Scene (b)	Scene (c)
Track length (m)	130	523	313
Flight altitude of UAVs (m)	30	40	40
Image density (images/m)	3.69	1.23	0.90
Ballastless or ballast	Ballastless	Ballastless	Both
Bridge or roadbed	Bridge	Both	Both
Number of railway lines	1	1	2