Data format of STPLS3D txt point clouds for Instance Segmentation

[LinoComesana]

Hi,

maybe I did not search enough, but I can not find the header information of the .txt files where the instance segmentation point clouds are released. Once downloaded the dataset, I checked that all .txt files has 8 columns, and I already know the meaning of the 6 firsts (x,y,z,r,g,b), but the last two are unknown for me.

As I could saw, taking the '1_points_GTv3.txt' file as an example, 7th column has only values between 0 and 14, which makes sense to think that this is the label column. However, 8th column has 1655 values in the range of [0,2736] and also -100. In the documentation related to instance segmentation is written that all ground points are labelled with -100 values, but this value appears only in the 8th column and not in the 7th. This, together with the fact that 8th column has values in the range mentioned previously, tricks me.

Sorry for opening this issue, but this should be clearer