Division 3.1.9 Altitude profile

The manufacturer shall define whether the altitude correction shall be applied in the test evaluation. In case an altitude correction is applied, for each measurement section the altitude profile shall be made available. The data shall meet the following requirements:

1. i..

   The altitude profile shall be measured at a grid distance of lower or equal than 50 m in driving direction.

2. ii..

   For each grid point the longitude, the latitude and the altitude shall be measured at least at one point (‘altitude measurement point’) on each side of the centre line of the lane and then be processed to an average value for the grid point.

3. iii..

   The grid points as provided to the air drag pre-processing tool shall have a distance to the centre line of the measurement section of less than 1 m.

4. iv.

   The positioning of the altitude measurement points to the centre line of the lane (perpendicular distance, number of points) shall be chosen in a way that the resulting altitude profile is representative for the gradient driven by the test vehicle.

5. v..

   The altitude profile shall have an accuracy of ± 1cm or better.

6. vi..

   The measurement data shall not be older than 10 years. A renewal of the surface in the measurement area requires a new altitude profile measurement.