Zero-gravity flights

Zero-gravity flights are regularly operated on an Airbus A310 in order to conduct many kind of scientific experiments in zero gravity.

One of such trajectories is present in the sample flights of the library: we can observe the characteristic profile in altitude and indicated airspeed.

import altair as alt

from traffic.data.samples import zero_gravity

focus = zero_gravity.phases(twindow=45).skip("45 min").first("15 min")

base = focus.chart().encode(
    alt.X(
        "utchoursminutesseconds(timestamp)",
        axis=alt.Axis(title=None, format="%H:%M"),
    )
)

chart = (
    alt.vconcat(
        alt.layer(
            base.encode(
                y=alt.Y(
                    "altitude",
                    scale=alt.Scale(domain=(15000, 30000)),
                    axis=alt.Axis(
                        title="altitude (in ft)",
                        labelColor="#4c78a8",
                        titleColor="#4c78a8",
                    ),
                ),
            ).mark_line(color="#4c78a8"),
            base.encode(
                y=alt.Y(
                    "IAS",
                    scale=alt.Scale(domain=(100, 350)),
                    axis=alt.Axis(
                        title="indicated airspeed (in kts)",
                        labelColor="#f58518",
                        titleColor="#f58518",
                        titleAnchor="end",
                    ),
                ),
            ).mark_line(color="#f58518"),
        )
        .resolve_scale(y="independent")
        .properties(width=500, height=200),
        base.encode(
            y=alt.Y("phase", title="Flight phase"),
            color=alt.Color(
                "phase",
                legend=None,
                scale=alt.Scale(
                    domain=["LEVEL", "CLIMB", "DESCENT"],
                    range=["#4c78a8", "#f58518", "#54a24b"],
                ),
            ),
        )
        .mark_point()
        .properties(width=500, height=75),
    )
    .configure_axis(
        labelFontSize=14,
        titleFontSize=16,
        titleAngle=0,
        titleY=-10,
        titleAnchor="start",
    )
)
chart

from ipyleaflet import Map

m = Map(zoom=8, center=(49, -2))
m.add(zero_gravity, color="#79706e", weight=2)

for segment in focus.query('phase=="CLIMB"').split("30s"):
    m.add(segment, color="#f58518", weight=4)
for segment in focus.query('phase=="DESCENT"').split("30s"):
    m.add(segment, color="#54a24b", weight=4)
for segment in focus.query('phase=="LEVEL"').split("30s"):
    m.add(segment, color="#4c78a8", weight=4)

m