London to NYC Great Circle

Mix.install([
  {:plotly_ex, "~> 0.3"},
  {:kino, "~> 0.18"}
])

Section

A great circle is the shortest path between two points on a sphere. Plotly automatically interpolates great circle arcs when lat:/lon: endpoints are given. Use layout.geo.projection.type: "natural earth" for a standard world map view.

alias Plotly.{Figure, Scattergeo}

Figure.new()
|> Figure.add_trace(
  Scattergeo.new(
    lat: [51.5074, 40.7128],
    lon: [-0.1278, -74.0060],
    mode: "lines+markers",
    text: ["London", "New York"],
    line: %{width: 3, color: "red"},
    marker: %{size: 10}
  )
)
|> Figure.update_layout(
  title: "London to NYC Great Circle",
  geo: %{
    projection: %{type: "natural earth"},
    showland: true,
    landcolor: "#EAEAAE",
    showocean: true,
    oceancolor: "#BDDDE4",
    showcountries: true,
    showframe: false
  }
)
|> Plotly.show()