Glossary: R

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  1. The restoration, and improvement where appropriate, of facilities, livelihoods and living conditions of disaster-affected communities, including efforts to reduce disaster risk factors. The recovery phase begins soon after the response and...
  2. The return of light or sound waves from a surface. If a reflecting surface is plane, the angle of reflection of a light ray is the same as the angle of incidence. Source: NASA (
  3. The operations and decisions taken after a disaster with a view to restoring a stricken community to its former living conditions, in particular with a view to restoring life lines and key services.
  4. The ratio of the amount of water vapor in the air compared to the amount required for saturation (at a particular temperature and pressure). Source: NASA (
  5. The technology of acquiring data and information about an object or phenomena by a device that is not in physical contact with it. In other words, remote sensing refers to gathering information about the Earth and its environment from a distance, a...
  6. The ability of a system, community or society exposed to hazards to resist, absorb, accommodate, adapt to, transform and recover from the effects of a hazard in a timely and efficient manner, including through the preservation and restoration of its...
  7. A measure of the ability to separate observable quantities. In the case of imagery, it describes the area represented by each pixel of an image. The smaller the area represented by a pixel, the more accurate and detailed the image. Source: NASA (...
  8. The provision of emergency services and public assistance during or immediately after a disaster in order to save lives, to reduce health impacts, to ensure public safety and to meet the basic subsistence needs of the people affected.
  9. An east-to-west orbit of Earth (Earth spins west to east). See prograde orbit. Source: NASA (
  10. Process of the Earth circling the sun in its orbit. Revolution determines the seasons, and the length of the year. In addition, differences in seasons occur because of Earth's inclination (tilt on its axis) of about 23.5 degrees as it revolves...
  11. Process of the Earth turning on its axis. Rotation determines day and night, and the length of the day. Compare with revolution. Source: NASA (


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