Is the ground rough or smooth?
The ground is smooth.
     src        edge_attr  dst
0      0   to the left of    9
1      0   to the left of   14
2      0   to the left of   30
3      1               of    0
4      1   to the left of   14
..   ...              ...  ...
257   40   to the left of   13
258   40  to the right of   18
259   40  to the right of    9
260   40  to the right of   16
261   40  to the right of   17

[262 rows x 3 columns]