1945
Volume 2021 Number 98
  • E-ISSN: 27887138

Abstract

Ever since humans have felt the need to survey what was happening in the environment around them, a higher vantage point has been considered useful. Trees, hills and mountains served this purpose until humans were able to ‘fly’. Balloons, airplanes and later satellites offered observation platforms that enabled a more general and complete perception of the earth’s surface. The need for such a view was initially driven by military purposes, but other applications have also greatly exploited the possibilities.

Sustainable Development Goals:

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