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- The river-like channel is believed to have been formed by flowing water, which at some distant epoch cut through highland terrain and successively formed smooth plains. With a width of close to 7 km and a depth of around 300 m, the valley floor shows clear linear features believed to be ice-rich, and formed by debris and ice in a manner not dissimilar to the formation of glacial valleys on Earth.
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NikolaiFyodorov · 4105 days ago · link ·
How does that app measure elevation? After all, it can't be based on sea level.
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NikolaiFyodorov · 4104 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.