Compare the top three summit elevations in J. B. Plescia’s 2004 MOLA-based study of 22 Martian volcanoes: Arsia Mons at 17.7 kilometres, Ascraeus Mons at 18.1 kilometres and Olympus Mons at 21.1 kilometres. These values use the same Mars reference level, so they compare summit elevation rather than height above each volcano’s local base. The reference level and dataset matter when comparing mountain measurements.
Sources:
https://doi.org/10.1029/2002JE002031
https://youtube.com/shorts/d_p_cF53iV4
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