Aerial Field View (IMAGE) American Society of Agronomy Caption Aerial photo of spatial variability within a field as part of a tractor guidance study evaluating how topography and field shape variations influence precision agriculture efficiencies in pasture systems. Credit George Fitting Usage Restrictions For use with this story only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.