In order to get some copyright free satellite imagery I used the WorldWind Java applet to access data from Landsat and NASA Blue Marble servers, for some reason this works far more efficiently on a Windows XP Virtual Machine. I started zoomed all the way and then began to capture images at regular intervals until the whole globe was visible:
Using parenting I scaled them down together in After Effects and keyframed in a zoom. The speed of this was corrected using the exponential graph function to account for the percentages be too large at the beginning of the scene.