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1800: Discovery of Infrared by Sir William Herschel.
1826: First photographic Image taken by Joseph Nicephore Niepce.
1839: Beginning of practice of Photography.
1855: Additive Colour Theory postulated by James Clerk Maxwell.
1858: First Aerial Photograph from a balloon, taken by G. F. Tournachon.
1873: Theory of Electromagnetic Energy developed by J. C. Maxwell.
1903: Airplane invented by Wright brothers.
1909: Photography from airplanes.
1910s: Aerial Photo Reconnaissance: World War I.
1920s: Civilian use of aerial photography and Photogrammetry.
1934: American society of Photogrammetry founded.
1935: Radar invention by Robert Watson-Watt.
1939-45: Advances in Photo Reconnaissance and applications of non-visible portion of EMR: World War II.
1942: Kodak patents first false colour infrared film.
1956: Colwell’s research on diseases detection with IR photography.
1960: Term “Remote Sensing” coined by Office of Naval Research personnel
1972: ERTS-1 launched (renamed Landsat-1).
1975: ERTS-2 launched (renamed Landsat-2).
1978: Landsat-3 launched.
1980s: Development of Hyperspectral sensors.
1982: Landsat-4 TM & MSS launched.
1984: Landsat-5 TM launched.
1986: SPOT-1 launched.
1995: IRS 1C launched.
1999: Landsat-7 ETM+ launched.
1999: IKONOS launched.
1999: NASA’s Terra EOS launched.
2002: ENVISAT launched.
2003: ISRO's RESOURCESAT-1 (IRS P6) launched.
2005: ISRO's CARTOSAT-1 launched.
2007: ISRO's CARTOSAT-2 launched.