Sites around the World Contributed Data (IMAGE) NASA/Goddard Space Flight Center Caption Sites around the world (yellow dots) contributed data and serve as "landmarks along a trail" for the newest update to a global standard called the International Terrestrial Reference Frame. Each site conducts precision measurements using at least 1 and up to 4 geodetic techniques. Credit Credits: NASA/Earth Observatory/Goddard Usage Restrictions None 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.