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Satellite datasets like WorldView can see objects as small as 1.5 feet in diameter. In 2014, WorldView-3 will be able to see objects a small as a foot.

The divisions of Perspective are 3, as used in drawing; of these, the first includes the diminution in size of opaque objects; the second treats of the diminution and loss of outline in such opaque objects; the third, of the diminution and loss of colour at long distances.

We can see every square metre of the planet on Google Earth. But there is no substitute for that sensory experience of going out into the world and discovering things for yourself.

The view of Earth is spectacular.

What these satellites do is they record light radiation that's reflected off the surface of the Earth in different parts of the light spectrum. We use false color imaging to try to tease out these very subtle differences on the ground.

Even on television, the wavelengths that you use, they have to be distributed between countries.

Where there is an observatory and a telescope, we expect that any eyes will see new worlds at once.

I am actually a resident of three worlds - of America, of India, and of Africa. I live in Uganda most of the year. It's extraordinary to have that worldview that is an expansive one rather than just looking at the world from where you sit.