A system and method of guiding a vehicle comprises establishing elevation data and corresponding location data for a work area. A particular location of a vehicle within the work area is determined. Roll data and pitch data are estimated corresponding to the particular location. The vehicle is guided...http://www.google.com.au/patents/US7593798?utm_source=gb-gplus-sharePatent US7593798 - Vehicular guidance system having compensation for variations in ground elevation
