Analysis of the changes to the Reventador volcano in the Ecuadorian Andes since 2000, based on images acquired by the TerraSAR-X and TanDEM-X satellites. The coloured areas show young lava fields and the growth of the volcano. A complete colour cycle corresponds to a 25-metre-thick layer of lava. There has been an increase of 75 metres at the peak of the volcano. The CEOS volcano project observes numerous active and currently dormant volcanoes in the Andes.