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NikolaiFyodorov · 4328 days ago · link · · parent · post: Astronomers discover remnants of 1,500 km long river on Mars.
How does that app measure elevation? After all, it can't be based on sea level.
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NikolaiFyodorov · 4328 days ago · link ·
I guess that's the only logical answer. I'd be curious to find out whether it takes into account massive elevation discrepancies like Olympus Mons.
I realise it's 473 days since we had this conversation, but I've just finished reading this novel and I was overjoyed to discover an answer to the question. Elevation on Mars is based on atmospheric pressure. Zero altitude is defined as 610.5 Pascals. So now we know.