Multiple Depth DB Tables Indexing on the Sphere

Figure 3

Select query execution times and other parameters for a DIF-managed table with ∼3 billion entries as a function of the disc radius. Results for four different pixel scales are reported both for HTM (a) and HEALPix (b). Each point represents the average of the results from 50 queries performed on random sky positions.

(a)

(b)