Sar image (IMAGE) Penn State Caption Shell rings are indicated by white dots. Panel A shows what shell rings look like from a normal satellite image. Panel B shows what shell rings look like in radar (SAR) data. They show up very distinct from the surrounding area, in part due to their composition and the nature of the soils on and around these features. Credit Dylan Davis, Penn State Usage Restrictions non commercial use only License Original 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.