Satellite imagery are pictures of the Earth taken from satellites orbiting the planet. The photography equipment used in satellite imagery relies upon light waves (both visible and non-visible by the human eye); therefore, the images convey information as perceived by the particular spectral band that the satellite utilizes. Interpreting these images to best relate the information is a learned technique referred to as remote sensing.
Remote Sensing Lab (8-12) by Dr. Meredith Beilfuss, Butler University