On Mon, Apr 06, 2020 at 04:00:15PM +0800, 積丹尼 Dan Jacobson wrote:
> X-debbugs-Cc: [hidden email] > Package: units
> Version: 2.19-1
> Severity: wishlist
> File: /usr/share/units/definitions.units
> Add https://en.wikipedia.org/wiki/Flight_level > 1 FL = 1 hectoft = 1e2 ft
> By the way one wants to write e.g., FL310, not 310FL, but nevermind.
You can, of course, write "FL 310" if you like. I thought about
allowing prefix units like this, most common for currency, but decided
I've added the following:
flightlevel 100 ft # Flight levels are used to ensure safe
FL flightlevel # vertical separation between aircraft
# despite variations in local air
# pressure. Flight levels define
# altitudes based on a standard air
# pressure so that altimeter calibration
# is not needed. This means that
# aircraft at separated flight levels
# are guaranteed to be separated.
# Hence the definition of 100 feet is
# a nominal, not true, measure.