zero-level elevation

vertical reference point

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

ক্যাটাগরি:

criteriongeographic location