this post was submitted on 18 Jan 2025
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The pre-1800 numbers sound too low. There are lots of old buildings much higher than 10 meters high, and I doubt they were all unoccupied at the same time.
If you look at the description of the data ie. That falls are considered to be gaining altitude not losing altitude, they seem to be referring to distance from solid object connected to ground not distance from ground or sea level. So mountains and buildings don't count unless you jump off of it.
Even before tall buildings, trees should put the noise floor above 30 meters.