How can I decide the distance unit?

Hi everyone!
I’ve got a 3d coordinates of object and they have lots of number.
But, I don’t know what the unit they are. (such as cm,mm,m …)
Could anyone let me know how to decide the units of 3d coordinate(x,y,z)?
Thanks!

you would need to know the spacing on your checkerboard to match the scale (i.e. typically when you print it it has a known distance, and you can also measure that :slight_smile:

When I measured the camera parameter, the checkerboard spacing was 25mm.
Then, is the unit cm that I got the 3d coordinate?
Thanks!