Aerial photograpgy history
The aerial photography began with timed and remote exposure cameras affixed on balloons, gliders and pigeons, but it became widespread with the appearance of motorized aircrafts and airships about one hundred years ago. It has been soon realized that photographs taken approximately vertically downwards speed up the mapping work. Thus, the cartographic use of aerial photographs can be dated about the same time as aerial photography itself.
Sectors of aerial photography:
Earth Observation: aerial photography for mapping and surveys which usually works with vertical camera axis measuring images (for remote sensing, aerial photogrammetry, aerial mapping)
Aerial photography: aerial images taken with oblique and vertically downward looking camera axis (for documentation, artistic, hobby, etc. purposes)