An issue about the depth scale in tnt dataset

[Aoiryo]

Hi, thanks for your great work!
I'm recently working on a topic concerning about the depth in scence, and I'm confused about the scale in the tnt dataset: Playground.

I could see that tmin is 0 and tmax is approximately 500 with a grid size of 640, while the scene is not that big as far as I can see in the point cloud.
I guess it's because of the world scale, but I am not quite sure. Could you give any comments on this?

Thanks a lot!