(up one level: ASTERICS European Data Provider Forum and Training Event 1)
VizieR provides access to the most complete library of published astronomical catalogues and data table available on-line, organized in a self-documented database.
HiPS is the hierarchical tiling mechanism, which allows one to access, visualize, and browse seamlessly, image, catalogue, and cube data.
MOC, the Multi-Order Coverage map method, allows to specify arbitrary sky regions, with very fast comparisons between them. It is based on the HEALPix sky tessellation algorithm.