“SPOT satellites (Satellites Pour l’Observation de la Terre) were designed by CNES to study the Earth. From 1986 to 2015, the series of 5 satellites were able to take images of the planet with improved resolution with each generation of satellites (from 20 m to 2.5 m). In order to perpetuate and enhance these data, the SPOT World Heritage (SWH) program runned by CNES make available for free to the public the SPOT 1, 2, 3, 4 and 5 archive. These are images (60×60 km) acquired from 1986 until 2015 in L1A level (radiometric egalization, no geometric correction).”
More information on the position and application, follow this link.