ESAEducationAccueilMétéo et climatChangement globalLes catatastrophes naturelles
   
À propos d'Eduspace
Qu’est-ce qu’Eduspace?Les outils d’Eduspace
Sélectionnez votre langue
Principes de télédétection
Qu’est-ce que la télédétection ?La télédétection en détailléHistoire de l’observation de la TerreCartographie et données satelliteOrbites des satellitesSatellites d’observation de la Terre
Ressources
Multimedia
Earth images galleryImage GalleryVideo Gallery
Services
Contact usRecherche dans Eduspace
 
 
 
 
Article Images
Signatures spectrales
 
Retour a l'article
False colour composite image of area in Jutland, Denmark
False colour composite image based on Landsat data in the near infrared, red and green channel. Green vegetation is seen as shades of red. Settlement and bare soil areas are seen as bluish.

Credits: ESA
 
 
Retour a l'article
Graphs of spectral signatures of water, soil and vegetation
Graphs of spectral signatures of water, soil and vegetation. Vegetation has a remarkably high reflection in the near infrared channel 4, and a low reflection in the visible red channel 3. This makes it possible to distinguish vegetation areas from bare ground. The difference of reflection in channels 3 and 4 is great for vegetation areas and insignificant for bare ground.

Credits: ESA
 
 
Retour a l'article
The spectral signatures
The spectral signatures are processed as digital values in the satellite scanner. Here is a hypothetical example of how the Landsat satellite might record water, green vegetation and bare ground.

Credits: ESA
 


La télédétection
IntroductionTechnologie radarLes canaux de LandsatCartographie de la végétationClassification des zonesPerturbations atmosphériques
 
 
 
   Copyright 2000 - 2015 © European Space Agency. All rights reserved.