What is the starting coordinate of the bev map?

[JunjieLiuSWU]

For KITTI-360 data, What is the starting coordinate of the bev map? I mean the bev map's left border coordinate, The bev maps contain real-world distance relationships, so the start coordinate is very import, but it was not given in your paper. There is also another question, Are the bev maps in the LiDAR coordinate system or the camera coordinate system?