Theoretical tunnel section
Theoretical tunnel section (TTU)
The tunnel section is used to create the tunnel digital terrain model and to calculate the cross-sections of the tunnel.
For optimum digital terrain modelling it is important not to have sharp edges. It should be possible to interpolate all measured points onto this tunnel section.
The tunnel section is created using lines and arcs relative to the roadline and profile.
The commands used are Add point and Edit point. You can also delete points. When you open a new tunnel section it will look like a tunnel. You can either delete all points and start again or edit existing points.
The tunnel section is built up from left to right.
