Editor’s Note—This article is one in a series about how NASA and other science institutions measure and monitor sea level rise. While melting ice is not the only contributor to sea level rise, satellite records since the 1990s show that it has been the largest contributor. That is one third of the total amount of sea level rise observed over that period. Find more stories about our changing oceans and coasts in Earth Observatory’s sea level rise collection. The Sea Level Change Data Pathfinder on NASA’s Earthdata site highlights tools used by researchers to study ice sheet altimetry, including ICESat Global Antarctic and Greenland Ice Sheet Altimetry Data, ICESat-2 Land Ice Height, GRACE and GRACE-FO Greenland Ice Mass Anomalies, and Antarctic Ice Mass Anomalies.