High-Resolution Digital Topography (image) Geological Society of America Caption This is a schematic illustration of three methods of producing high-resolution digital topography. Credit K. Johnson et al. and Geosphere. Usage Restrictions Credit K. Johnson et al. and Geosphere 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.