• PixxlMan@lemmy.world
    link
    fedilink
    arrow-up
    2
    ·
    18 hours ago

    A globe isn’t a projection at all, it’s the real deal. Projection occurs when you take that 3D surface and map it to a 2D surface.

    • volvoxvsmarla@sopuli.xyz
      link
      fedilink
      arrow-up
      2
      ·
      12 hours ago

      I mean, if I wanted to knit pick - I guess theoretically the earth isn’t a perfect ball, and the mountains aren’t flat, so you would need a globe with topography for it to really not be a projection but a model

      • exasperation@lemmy.dbzer0.com
        link
        fedilink
        arrow-up
        1
        ·
        6 hours ago

        The topography is basically not significant.

        The elevation of the highest point on Mt. Everest is 8,848 meters. Compared to the radius of the Earth itself (averaging 6,371,000 meters and varying about 10,000 meters from that average), that 0.139% difference in radius at that mountain not going to be noticeable.

        If you shrunk the entire earth down to the size of a 2 meter diameter ball (1 meter radius), Mt. Everest would rise about 1.39 millimeters from the surface.

        Simple imperfections in polishing a representative globe would represent larger variations in altitude than exist on the Earth itself.