Invited by UNESCO International Centre on Global-Scale Geochemistry (ICGG), Dr. Chaosheng Zhang gave a plenary talk at the Seminar on the International Scientific Cooperation Program – “Mapping Chemical Earth” held in Langfang, China during October 15-17, 2018 with about 150 delegates. The presentation title was “Towards machine learning for identification of hidden spatial patterns and relationships in big data of environmental geochemistry”. The “Mapping Chemical Earth” program aims to produce maps for chemical components on the earth surface by collecting catchment sediment samples from all over the world.