41 
 
Figure 9. OxTS horizontal frame definition 
 
The OxTS horizontal frame is attached to the vehicle. The longitudinal and lateral axes remain parallel to 
a horizontal plane. The Longitudinal axis is also parallel to the vehicle’s heading when viewed from above. 
ISO 8855 intermediate system 
The ISO 8855 intermediate system is attached to the vehicle but the X- and Y-axis both 
remain parallel to the ground plane. The X-axis is also aligned with the vertical projection 
of the vehicle heading. The definition of the ISO 8855 intermediate system is listed in 
Table 24. ISO 8855 intermediate system and shown in Figure 10. 
Figure 10. ISO 8855 intermediate system 
 
The ISO intermediate system is attached to the vehicle. The X- and Y-axes remain parallel to a horizontal 
plane. The X-axis is also parallel to the vehicle’s heading when viewed from above.