The model grid may be rotated using a set of Euler angles for solid body rotation. The Euler angles are computed by defining the geographic latitude and longitude of the rotated north pole and a point on the prime meridian. This option activates the driver which gives results from a sample rotation of the model grid. It indicates how scalars and vectors are interpolated and rotated before being used on the rotated model grid. Refer to Section 25.2.1 for details.