# Knowledge System, Ontology, and Knowledge Graph of the Deep-Time Digital Earth (DDE): Progress and Perspective

> Research article (Journal of Earth Science, 2023) · cited 15× · AI/ML

**Wikidata**: [openalex:W4387746293](https://www.wikidata.org/wiki/openalex:W4387746293)  
**Source**: https://4ort.xyz/entity/knowledge-system-ontology-and-knowledge-graph-of-the-deep-time-digital-earth-dde-progress-and-perspective