I realize this post is over 4 years old and there have been updates to MicroStation and Geopak but I am having this problem as well.
I have a tin file that I imported to a DTM using Corridor Modeler. I started to notice some differences after plotting my cross sections using the DTM. To check the TIN vs DTM I plotted both using the Draw Cross Sections from Surfaces. I could see that the DTM is actually lower than the TIN when viewing the cross sections.
Has anyone else run into this issue?
Sean
MS 08.11.09.459
GPK 08.11.07.615