What does this number measure?
Olympus Mons is a very broad shield volcano with generally gentle slopes, topped by a group of calderas. The compared dimension is its approximate diameter of 600 km, not its height. Its relief is often described as around 22 km above the Martian reference level, with values depending on the chosen datum and base. The volcano's boundary and the relief shown remain interpreted.
This entry compares the volcano’s approximate diameter, around 600 kilometres. It does not represent a height of 600 kilometres.
Relief elevation depends on the reference level adopted. Comparing heights therefore requires a different value and a shared convention.
Compare the stated dimensions
The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.
Source and limitations
Rounded diameter and diffuse boundary of the volcanic structure; indicative height of about 22 km depending on the reference level, without equating it with the displayed diameter.
Interpreted orbital view of Olympus Mons's broad shield. The compared width represents the edifice's approximate diameter of 600 km; its relief of approximately 22 km, depending on the reference level, is not this dimension.