The S2Cell hierarchy projects the Earth onto six top-level “face cells”, which may be unwrapped and flattened into a stairstep arrangement. Below is a map of the six faces:
A single space-filling curve covers the entire globe, snaking from one face to the next. Note the traversal order in the odd-numbered faces is the mirror of the order in even numbered faces.
^----> <----^ | 4 | 5 | | | | x V -----> ^----> <----^ | 2 | 3 | | | | x V -----> ^----> <----^ | 0 | 1 | | | | x v ----->
You can print out the following six images on a good color printer, glue them onto sturdy cardboard squares and tape them together to form a cube, to make a model S2Cell-Hierarchy Globe, which will let you visually locate any cell at level 5 or higher.
CAVEAT: While these images are conceptually useful, the satellite imagery has
not been transformed correctly, so don’t rely on these images to determine
which geographic features are contained by a given