In this paper, we describe an HDF5 schema created to support the efficient visualization of the large image cubes that will be produced by SKA Phase 1 and precursor radio telescopes. We demonstrate how the ''HDF5-IDIA'' schema's features can improve the performance of visualization software, using both low-level metrics and real-world tests of the schema's implementation in CARTA, an image viewer that is being developed to replace the existing CyberSKA and CASA viewers.
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