low-altitude vs low-level

low-altitude

low-level

adj
  • of, or relating to a program, or to code in which each statement corresponds to a single machine instruction 

  • detailed 

  • Situated or occurring at a lower level. 

  • relatively unimportant 

  • not intense 

How often have the words low-altitude and low-level occurred in a corpus of books? (source: Google Ngram Viewer )