21AT (Twenty First Century Aerospace Technology)

21AT (Twenty-First Century Aerospace Technology, 二十一世纪空间技术应用股份有限公司) is a Beijing-based Earth observation data and services company founded in 2001, operating as one of China's leading commercial satellite imagery distributors and geospatial intelligence providers. The company owns and operates the TripleSat constellation — three 1-meter resolution optical imaging satellites (TripleSat-1, -2, and Carbonite-1 co-manifested with SSTL technology) providing daily global coverage with rapid tasking capability.

TripleSat's 1-meter panchromatic and 4-meter multispectral resolution places it in direct competition with commercial imagery from Airbus SPOT and Pléiades satellites in the medium-resolution Chinese market. Beyond its own constellation, 21AT distributes imagery from partner satellite systems including the UK-built Carbonite video satellite and data from multiple Chinese government and commercial Earth observation programs, positioning itself as a one-stop aggregated satellite imagery marketplace for Chinese government customers, infrastructure ministries, and commercial enterprises.

Key applications include urban planning and infrastructure change detection, agricultural crop monitoring, disaster assessment for China's Ministry of Emergency Management, and belt-and-road infrastructure development monitoring along China's overseas construction projects in Asia, Africa, and South America. 21AT operates a network of Chinese ground stations for direct downlink and has partnerships with provincial governments for regional remote sensing applications.

As China's commercial Earth observation market matures with new high-resolution optical and SAR constellations from Chang Guang Satellite Technology, HEAD Aerospace, and Spacety, 21AT has evolved its value proposition toward analytics and geospatial intelligence services rather than raw imagery sales.