The electromagnetic spectrum: energy for information transfer -- Remote sensing: acquiring information about a phenomenon while still at some distance from it -- Remote sensing in the ultraviolet: sensing at wavelengths shorter than those we can see -- Visible light: conventional photography, the oldest and most highly developed realm of remote sensing -- Remote sensing in the reflected of near infrared: sensing the light at wavelengths longer than those we can see -- Remote sensing in the thermal or emitted infrared: radiation that results from molecular or atomic motion -- Passive microwave: sensing naturally emitted or reflected radiometric wavelengths -- Active microwave: radar, generating a wave and recording its reflection or echo -- Multispectral remote sensing: imaging a target at more than one wavelength -- Social implications of remote sensing: will the "spy in the sky" become the Orwellian Big Brother.
