- Countless people have seen rockets take off...
(more than 15 miles)
I've seen the Shuttle take off and disappear into the sky. That doesn't mean it reached orbit, however.
- We have google earth( would be impossible to constantly update info, correctly as it does, as fast as it does.
- Google does not own Satellites.
- Google uses aircraft pictures and stitches them together. The Earth looks round when zoomed out because that's how Google programmed the 3D model the pictures lay on to look. The 3D model could just as easily be cube or disk shaped.
- live footage of space and earth
- The testimony of hundreds of astronauts along with countless pictures
High altitude observations don't really provide proof for a Round Earth.
The reason why the earth might look round from very high altitudes is because of Snell's Law. I'm sure you have seen that when you put a pencil halfway in a glass of water, it appears to be broken. This is because water is more denser than air and light rays bend when the density and temperature of the medium changes. This is known as the Snell Law.
Have you ever seen the outside temperature readings on an airplanes' info channel? It goes all the way down to a few degrees, because atmosphere gets colder as you ascend. When one is looking down from a plane to the surface of the earth they are looking through an atmosphere that gets warmer (and therefore more dense) as it descends. This causes light rays from the earth to bend and makes the surface look curved - just like the pencil in the water getting broken. It's not a sharp break as in the pencil example but a smooth curve, because the temperature and density changes gradually, not suddenly.