This project aims to meet the needs of "Digital Earth" spatiotemporal information services, research global spatiotemporal observation data organization and management methods, construct high-performance geographic analysis and artificial intelligence analysis models, propose global spatiotemporal data knowledge service technologies, develop a data-ready, analysis-ready, decision-ready and open-sharing Earth engine system, and build a spatiotemporal information infrastructure, serving the construction of digital twin cities, and further providing a controllable spatiotemporal information base for natural resource management, urban governance, public services, smart transportation, disaster relief, ecological construction, etc.