InSAR Image and Overlay (image) Stanford University Caption In farmland of the San Luis Valley, a sea of low-quality InSAR data, indicated by blue, is punctuated by spots of high-quality data, indicated by yellow and orange. By overlaying a Google Earth image of the same location on the InSAR data, Reeves determined that the high-quality data occur in the areas between center-pivot irrigation circles. Credit InSAR images courtesy of Jessica Reeves. Usage Restrictions May not be altered or sold. 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.