The UN map you show stems from Guttenberg's Euro-centric map circa AD 1600. It is simply a way of showing our sperical world on one plane. You infer that the UN thinks the world is flat ... I suggest to you that this is not the case.
The UN map does not show Ant-arctica ... could you please tell me where the south pole is.
If we all live on one surface - what is on the other side?
Please explain how the seasons and the tides work with a flat earth.
Why are all the other planets in our solar system spherical yet the earth flat.