A commercial, Chinese constellation of four remote-sensing minisatellites that provide imagery with 0.5-m panchromatic resolution and 2-m multispectral resolution along a 12-km swathe. The first pair of satellites was launched on 28 December 2016, and the second pair on 9 January 2018, all from Taiyuan Satellite Launch Center, into Sun-synchronous orbits at an altitude of 530 km.