How to combine saved pcds to final map?

[lucasjinreal]

I have saved serveral pcd like this:

1509348809170593.pcd  1509348851507016.pcd  1509348905653523.pcd  
1509348818478693.pcd  1509348857812349.pcd  1509348914160718.pcd  runs
1509348823182730.pcd  1509348866019410.pcd  1509348921467016.pcd  src
1509348829187741.pcd  1509348872324848.pcd  1509348923368650.pcd

However, how to combine it into a final map?

[zhu-bingo]

I meet the same question,have you solved it? Thank you