Altitude / max Altitude filter

[groundhogxc]

A filter for flight altitude would be great. Specifically, most useful would probably be "max altitude".

Use case: Trying to look at all flights that were not wave flights on a given day (use a filter max_altitude < 3000 for example), or, conversely, to look at all flights of a region that were wave flights (max_alt > 3000 or whatever is useful for that region).

Of course if you have a better idea to filter for wave, that'd be fine as well... (Circling fraction < some percentage could also be useful for example, could also be applied to ridge flying).

[samuel-git]

here a quick idea how this could look like @moldhouse

[groundhogxc]

here a quick idea how this could look like @moldhouse

Looks nice! But I would not call it "wave", but rather just "altitude" if it is purely a max-altitude-based filter with no other wave-specific properties.