Both types of imaging use an analogy between the  data space of imaging spectrographs and the conventional  3-space of the physical world.
bˈoʊθ tˈaɪps ʌv ˈɪmɪdʒɪŋ jˈuːs ɐn ɐnˈælədʒi bᵻtwˌiːn ðə dˈeɪɾə spˈeɪs ʌv ˈɪmɪdʒɪŋ spˈɛktɹəɡɹˌæfz ænd ðə kənvˈɛnʃənəl θɹˈiːspˈeɪs ʌvðə fˈɪzɪkəl wˈɜːld.