Tiling System

Selected HLS tiling system is identical as the one used for Sentinel-2. The tiles dimension is 109.8km and there is an overlap of 4,900m on each side.
The system is aligned with the Military Grid Reference System (MGRS) and its naming convention derived from the UTM (Universal Transverse Mercator) system. The UTM system divides the Earth’s surface into 60 vertical zones. Each UTM zone has a vertical width of 6° of longitude and horizontal width of 8° of latitude, as shown in the map below. Each UTM zone is subdivided in MGRS 100x100km zone. The first 2 digits and 1 letter correspond to the UTM zone, the two last letters to unique ID.
The kml edited by ESA with all tiles ID can be downloaded here.

Military Grid Reference System