Which satellite operates under the Sentinel program?

The satellite that operates under the Sentinel program is Sentinel-2. The Sentinel program is part of the European Union's Copernicus Earth observation initiative, which aims to provide accurate and timely information about the state of the environment, land, and climate. Sentinel-2 specifically focuses on providing high-resolution optical imagery for land monitoring, agriculture, forestry, and disaster management.

Sentinel-2 consists of a pair of satellites that offer frequent revisit times and wide coverage, enabling effective monitoring of changes in land surfaces. The data collected by Sentinel-2 is critical for maintaining sustainable practices, enhancing food security, and responding to climate change.

In contrast, the other options listed—WorldView-1, IKONOS, and QuickBird—are satellites operated by private companies that primarily focus on commercial imaging and are not part of the Sentinel program. Therefore, Sentinel-2 stands out as the correct choice.