Reported at The Register

This plan to separate planes from drones is a no-brainer, and a 10-year-old could have designed it. To avoid buildings and the like, Amazon proposes:

Geospatial data of all hazards to navigation over 200 feet.

That shouldn’t be too difficult to provide and will work fine for drones travelling from warehouse to warehouse. However, below 200 ft there are many more obstacles, including non-stationary objects. And to confound matters, a lot of private property.

There is a huge leap from flying around in drone space, and actually landing on someone’s front lawn to make a delivery.

If they have thought things through, Amazon might realise the need for a 3D mapping system.