Άσκηση 3: Ανίχνευση και παρακολούθηση πολυχρονικής αλλαγής   Training fields of 2001 that have to be modified for 2003 (new lava flow, plume, cloud).   Training fields of 2001 that have to be modified for 2003 (new lava flow, plume, cloud).   Training fields of 2001 that have to be modified for 2003 (new lava flow, plume, cloud).   The supervised classification result for the Landsat 2001 image was manually re-coloured with colours that are easier to distinguish and associate with land cover features.   Supervised classification of 31 January 2003 Landat image. The volcanic plume was classified as clouds, but unfortunately it overlays part of the new lava of the 2001 eruption.   Supervised classification image of 15 January 2003. The image is very cloudy. Lava of the 2001 eruption can clearly be seen.