It a bit hard to determine what is happening just from one screen snap. However in this case I don't see anything usual. If the points are outside the tunnel envelope, as these points seem to be, then they will be shown as overbreak points. If you are having difficultly understanding how TBC Tunnel is representing the data, or if you think there is a problem, I would recommend contacting the Trimble Geospatial Distributor in Korea (
https://geosys.co.kr).------------------------------
James McWha
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