An introduction to remote sensing methodologies for observing the Earth's surface from different vantage points (from the ground, from airplanes, and from space). The course is fully web-based. It allows for a quantitative understanding of optical, thermal infrared, and radar images as acquired by Earth’s observation satellites like LANDSAT-TM, SPOT-HRV, NOAA-AVHRR and RADARSAT. Remote sensing applications are taken from the fields of forestry, agriculture, geology, oceanography, hydrology, and environmental studies. It does not deal with photo-interpretation. The course is recommended for students intending to do a forestry senior thesis in remote sensing. Le cours est aussi disponible en français.