zero-level elevation

vertical reference point

en-GB/ˈzɪəɹəʊ - ˈlɛvl ˌɛlɪˈveɪʃn/
en-US/ˈziɹoʊ - ˈlɛvəl ˌɛləˈveɪʃən/

Категории:

criteriongeographic location