Write about the development of Remote sensing Technology.

● Remote sensing was first used in 1858 by the French map-makers. They used hot air balloons and primitive cameras to take inclined aerial photographs of the landscape.

● During World War I, air planes were used to take aerial images of the war zone to gather information about the position and movement of the enemy troops

● After the war, aerial images were taken from various angles to create detailed and accurate maps of the territories

● The second revolution in the remote sensing technology began in 1970s with the launch of Earth Resource Technology Satellite (ERTS) which was later renamed as LANDSAT in 1975