When extracting ground it is useful that it can be used directrly from Cad based software (2 and a half D) that use points as insertion data.

So, the output would be a txt or csv file with the points coordinates to the local system. That is code, X,Y,Z where Z is the elevation of the local grid.

The points should not be thousants but one point created in the middle of the many others that the ground extraction feature already extracts, in the way the CONTEXT CAPTURE EDITOR did, choosing the distance i.e. 2 or 5 or 8 meters radius arround a heiborhood of the autocreated points.