4 ms·

"Build the gravitational wave observatory between the Thai restaurant and the railway station"

• krapht 7y ago
  You joke but a lot of radar/radio observation is done with ECEF coordinates, which is a (lat, lon, z-axis) triple.
  • jhayward 7y ago
    ECEF is a Cartesian (x,y,z) not spherical (𝞺, θ, 𝜑) coordinate system. Units in ECEF are in meters from (0,0,0).
    • krapht 7y ago
      Blah, shows how much I remember about it. We always converted to ENU locally to start with, hah.