Insects are a major concern. Not only can they be extremely irritating, they also transmit numerous diseases that will haunt you for years, or even kill you. Malaria is no picnic. Then there are lots of unfamiliar animals and, last but not least, homo sapiens. Dr. Richard Leaky has studied some of the oldest human remains in East Africa, and we'd prefer not to add our much more recent remains to his collection.
Humans are much more unpredictable than animals, especially when they are engaged in tribal warfare.
And so we gladly embrace remote sensing as a technology that can reduce our field time by more than 90 percent, while showing us much more of the terrain than we ever could hope to see in the field. The images provide us with the continuity we can never see in the jungle. They fill the gaps in our knowledge and permit us to pre-examine our areas of interest. By interpreting this imagery before we set foot in the field, we can create a very detailed geological map, albeit with numerous question marks. And these question marks become field targets.