Topography Meter (IMAGE) American Institute of Physics Caption This is the topography meter used in the field tests. Credit X.-Z. Xu/DLUT Usage Restrictions This image may be used only with appropriate caption and credit. 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.