Multiple Depth DB Tables Indexing on the Sphere

Figure 2

(a) The 8 HTM base pixels and recursive subdivisions on Earth surface. The “depth” 𝑑 of the trixels is marked. (b) HEALPix tessellation at order 𝑘=3 giving 768 pixels whose colors encode their actual IDs in the “ring” scheme.

(a)

(b)