From Longman Dictionary of Contemporary Englishmap onto something phrasal verbto match something or have a direct relationship with something → map→ See Verb table
Examples from the Corpus
map onto • Although types of users can be mapped on to these specific functions, this restricts the generality and flexibility of the curriculum.• How would the Myers-Briggs types map on to this framework?• The mnemonics used in the Relationships Listing map on to the text strings used within a module header.• These relations can then be mapped on to a database.• We have not included these qualities in our statements of attainment because they can not be mapped on to levels. 