Earth Resources Technology Satellite (ERTS) - 1973
Why the open web links it
Explains the early Earth-observing satellite ERTS, its role in environmental and urban studies, and its significance in remote sensing history.
Linked by 4 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including archives.gov, expose-news.com, geogarage.com, com.ua.