Rotating Earth animation

This example shows how to animate a rotating Earth, by using a GeoAxis and changing the dest attribute, which specifies the destination projection.

using Makie, CairoMakie, GeoMakie

First, we'll create an observable that will hold the destination projection. This can be passed to GeoAxis. You can also mutate geoaxis.dest directly, but it can sometimes be more convenient to set up your observables ahead of time, for readability.

destnode = Observable("+proj=ortho")

fig = Figure()
ga = GeoAxis(
    fig[1, 1],
    dest = destnode,
)
surface!(ga, -180 .. 180, -90 .. 90, zeros(128, 128); color=rotr90(GeoMakie.earth()), interpolate = false, shading = NoShading)
xlims!(ga, -89, 89) # TODO: FIXME
fig

Now that the figure is set up, we can record an animation.

record(fig, "rotating_earth_ortho.mp4"; framerate=30) do io
    for lon in -90:0.5:90
        ga.title[] = string(lon) * "°"
        destnode[] = "+proj=ortho +lon_0=$lon"
        recordframe!(io)
    end
end

"rotating_earth_ortho.mp4"

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