Glossary: D

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  1. A collection of facts, concepts or instructions in a formalized manner suitable for communication or processing by human beings or by computer. Source: NASA (
  2. A logically meaningful grouping or collection of similar or related data. Data having mostly similar characteristics (source or class of source, processing level and algorithms, etc.) Source: NASA (
  3. Shedding leaves at the end of the growing season. Source: NASA (
  4. Official issuance of a state of emergency or calamity upon the occurrence of a large-scale event (hazard), in order to activate measures aimed at responding to the needs arising as a consequence of the disaster. The declaration of a disaster by a...
  5. The angular distance from the equator to the satellite, measured as positive north and negative south. Source: NASA (
  6. Those practices or processes that result in the change of forested lands to non-forest uses. This is often cited as one of the major causes of the enhanced greenhouse effect for two reasons: 1) the burning or decomposition of the wood releases...
  7. A unit of angular measure represented by the symbol o. The circumference of a circle contains 360 degrees. When applied to the roughly spherical shape of the Earth for geographic and cartographic purposes, degrees are each divided into 60 minutes....
  8. The fan-shaped area at the mouth or lower end of a river, formed by eroded material that has been carried downstream and dropped in quantities larger than can be carried off by tides or currents. Source: NASA (
  9. Process by which water changes phase directly from vapor into a solid without first becoming a liquid. Source: NASA (
  10. The point in a satellite's orbit at which it crosses the equatorial plane from north to south. Source: NASA (
  11. A land area so dry that little or no plant or animal life can survive. Source: NASA (
  12. The man-made or natural formation of desert from usable land. Source: NASA (
  13. A device in a radiometer that senses the presence and intensity of radiation. The incoming radiation is usually modified by filters or other optical components that restrict the radiation to a specific spectral band. The information can either be...
  14. Accumulated organic debris from dead organisms, often an important source of nutrients in a food web. Source: NASA (
  15. In signal processing this refers to the representation of quantities in discrete units. The information is contained and manipulated as a series of discrete numbers as opposed to an analog representation where the information is represented as a...


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